Gateway West Transmission Line Final EIS 

Appendix D 

Large Format Data Tables

These tables compare the Proposed and Alternative Routes across many resourcesregardless of the need for plan amendments or the likelihood that they would be app
Gateway West Transmission Line Final EIS 

Appendix D – Large Format Data Tables 

List of Tables 

Table D.6‐1. Miles of Vegetation Types Crossed by the Proposed Routes and Alternatives

Table D.6‐2. Impacts (acres) to Vegetation from Construction

Table D.6‐3. Impacts (acres) to Vegetation from Operation

Table D.6‐4. (This table has been removed as it is no longer relevant to the Environmental Impact Statement)

Table D.6‐5. Construction Impacts to Vegetation (in acres) on Federal Lands

Table D.6‐6. Operations Impacts to Vegetation (in acres) on Federal Lands

Table D.6‐7. Wildland Fires Within the Analysis Area

Table D.8‐1. Invasive and Noxious Plant Species Potentially Present in the Gateway West Project Analysis

Area

Table D.9‐1. Impacts to Wetlands and Riparian Areas during Construction (acres)

Table D.9‐2. Impacts to Wetlands and Riparian Areas during Operations (acres)

Table D.10‐1. Miles of Big Game Crossed by the Proposed and Alternative Routes

Table D.10‐2. Known Raptor and Bird of Prey Nest Locations within 1 mile of Project Centerline

Table D.10‐3a. Pre‐ and Post‐Construction Levels of Fragmentation Resulting from Roads

Table D.10‐3b. Change in Fragmentation Levels as a Result of Roads Between Pre‐ and Post‐Construction

Table D.10‐4a. Pre‐ and Post‐Construction Levels of Fragmentation Resulting from Transmission Lines

Table D.10‐4b. Change in Fragmentation Levels as a Result of Transmission Lines Between Pre‐ and Post‐

Construction

Table D.10‐5a. Pre‐ and Post‐Construction Levels of Fragmentation Resulting from Roads and Transmission

Lines

Table D.10‐5b. Change in Fragmentation Levels as a Result of Roads and Transmission Lines Between Pre‐ and

Post‐Construction

Table D.10‐6. Acres of Construction Impacts to Big Game Habitat Impacted by the Gateway West Transmission

Line

Table D.10‐7. Acres of Construction Impacts that Would Occur within a 1‐mile Buffer around Raptors and Birds

of Prey Nests

Table D.10‐8. Acres of Operations Impacts to Big Game Habitat Impacted by the Gateway West Transmission

Line

Table D.10‐9. Acres of Operations Impacts that Would Occur within a 1‐mile Buffer around Raptor and Bird of

Prey Nest Locations

Table D.11‐1. ESA Threatened, Endangered, or Candidate Wildlife Species with the Potential to Occur within

the Analysis Area

Table D.11‐2. BLM Sensitive, Forest Service Sensitive, or MIS with the Potential to Occur within the Analysis

Area

Table D.11‐3. Miles of Habitat 

Table D.11‐4. Miles of Habitat 

Quantitative Dat

Table D.11‐5. Acres of Constru

Table D.11‐6. Acres of Constru

Quantitative Dat

Table D.11‐7. Acres of Operati

Table D.11‐8. Acres of Operati

Quantitative Dat

Table D.11‐9. Number of Grea

Table D.11‐10. Number of Colum

Centerlines

Table D.11‐11. Miles of Agency 

Table D.11‐12. (This table has b

Table D.11‐13. (This table has b

Table D.11‐14. Acres of Constru

Table D.11‐15. Acres of Operati

Table D.11‐16. Sightlines from O

are Located with

Table D.12‐1. Mining Activities 

Photograph Reco

Table D.13‐1. Paleontology Ris

Table D.14‐1. OPS Earthquake 

Table D.14‐2. Affected Miles b

Table D.14‐3. Miles of Landslid

Table D.14‐4. Acres of Constru

Table D.14‐5. Acres of Operati

Table D.14‐6. Miles of Each De

Table D.14‐7. Miles of Shallow 

Table D.15‐1. Analysis of Soil F

Table D.15‐2. Analysis of Soil F

Table D.15‐3. Soil Impacts on N

Table D.15‐4. Soil Impacts on N
Gateway West Transmission Line Final EIS 

Appendix D – Large Format Data Tables Table D.16‐1. Surface Water Road Crossings by Crossing Type

Table D.16‐2. Potential Construction Disturbance (in Acres per Risk Rank) In Areas of Flood Hazard Risk

Table D.16‐3. Potential Operations (in Acres per Risk Rank) Disturbance In Areas of Flood Hazard Risk

Table D.16‐4. (This table has been removed as it is no longer relevant to the Environmental Impact Statement)

Table D.16‐5. Surface Water Diversions Within One‐Half Mile Buffer of Transmission Lines

Table D.16‐6. Number of Surface Water Road Crossings by Stream Type

Table D.16‐7. Potential Construction Disturbance (in Acres per Depth Range) in Areas Containing Shallow

Groundwater

Table D.16‐8. Potential Operations Disturbance (in Acres per Depth Range) in Areas Containing Shallow

Groundwater

Table D.16‐9. (This table has been removed as it is no longer relevant to the Environmental Impact Statement)

Table D.16‐10. Potable Water W

Table D.16‐11. Miles of the East

Table D.16‐12. Estimated Trans

Table D.16‐13. TMDL and 303(d

Table D.16‐14. Acreage Compar

Table D.16‐15. Acreage ComparTable D.17‐1. Specific Land Us

Table D.19‐1. Roads, Railroads 

Table D.19‐2. Airports and Hel
Sagebrush

Saltbush

Greasewood

Dwarf Shrub

Other Shrub

Native Grass

Juniper

Deciduous 

Forest

Conifer Forest

Wetland & 

Riparian

Misc.

Disturbed 

1W(a) Proposed – Total Length 73.8 49.3 2.1 0.5 1.2 1.3 0.3 1.3 t1/ 4

Proposed – Comparison portion for Alternative 1W(a)-B 16.5 4.8 t1/ 0.4 t1/ 2

Alternative 1W(a)-B 20.9 11.1 5.0 0.1 0.2 1

1W(c) Proposed – Total Length 73.6 51.0 1.0 0.8 0.1 0.5 1.8 3.3 1.6 0.2 5

Proposed – Total Length 91.9 48.9 3.2 8.9 11.3 0.2 0.9 0.5 6Proposed – Comparison portion for Alternative 2A 16.8 8.1 3.5 0.6 0.5 1

Alternative 2A 16.0 7.0 1.9 4.4 0.1 0.5 1Proposed – Comparison portion for Alternative 2B 12.5 5.8 2.9 0.4 0.5 tAlternative 2B 12.2 5.3 0.6 4.7 0.7 0Segment 3 Proposed – Total Length 45.9 10.4 4.9 13.3 11.4 0.3 3

Segment 3A Proposed – Total Length 5.1 2.0 1.4 0.3 1Proposed – Total Length 197.6 122.3 0.1 6.0 11.0 1.2 t1/ 2.5 10.4 2.4 7.0 1.8 6

Proposed – Comparison portion for Alternatives 4B-4F 85.2 65.6 0.4 6.9 0.3 t1/ 1.2 2.9 0.5 3

Alternative 4B 100.2 78.5 t1/ 0.6 8.1 t1/ t1/ 1.8 0.3 3

Alternative 4C 101.6 76.3 t1/ 0.9 7.9 t1/ 1.3 0.3 6Alternative 4D 100.8 78.8 t1/ 0.6 8.4 0.1 t1/ 1.8 0.3 3Alternative 4E 102.2 76.6 t1/ 0.9 8.2 0.1 t1/ 1.3 0.3 6Alternative 4F 87.5 68.1 0.4 6.6 0.1 t1/ 1.2 1.1 2.6 0.5 3

Proposed – Total Length 55.7 24.4 0.4 5.2 4.2 3.6 0.3 2

Proposed – Comparison portion for Alternatives 5A,B 22.3 10.8 0.3 0.7 2.3 3.6 t1/ 

Alternative 5A 29.7 12.3 0.1 1.4 2.9 2.1 t1/ Alternative 5B 40.4 16.4 0.6 1.8 1.8 1.1 t1/ 3

Proposed – Comparison portion for Alternative 5C 32.9 14.5 t1/ 2.4 4.1 3.6 0.1 1

Alternative 5C 26.0 5.6 0.6 2.5 1.7 t1/ 0.2 9

Proposed – Comparison portion for Alternative 5D 19.2 8.0 1.9 1.8 0.2 2

Alternative 5D 17.0 2.3 0.1 3.5 0.3 5

Proposed – Comparison portion for Alternative 5E 5.8 1.6 0.2 t1/ 0

Alternative 5E 5.3 0.7 t1/ 0

6 Proposed – Total Length 0.5 0.2 

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, Notes: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero miles or null value

1/ "t" indicates only a trace amount (<0.1 mile) crossed2/ Alternative 4G was added in late 2012 and was therefore not added to this table

3

1W

2

42/

5

Table D.6-1. Miles of Vegetation Types Crossed by the Proposed Routes and Alternatives

Segment 

Number Proposed or Alternative Name

Segment 

Length 

(Miles)

Natural Vegetation

D

Table D.6-1 Page 1 of 2

Gateway West Transmission Line Final EIS
Sagebrush

Saltbush

Greasewood

Dwarf Shrub

Other Shrub

Native Grass

Juniper

Deciduous 

Forest

Conifer Forest

Wetland & 

Riparian

Misc.

Disturbed 

Proposed – Total Length 118.2 34.8 1.7 1.1 0.5 7.6 2.5 2.4 0.3 9

Proposed – Comparison portion for Alternatives 7A,B 35.1 12.7 1.1 0.4 2.1 2.5 2.4 t1/ 1

Alternative 7A 37.7 16.6 1.1 2.8 3.1 0.6 3

Alternative 7B 46.2 22.8 0.5 1.0 1.1 1.5 t1/ 5

Proposed – Comparison portion for Alternative 7C 20.1 4.0 1.7 4

Alternative 7C 20.3 0.8 7Proposed – Comparison portion for Alternative 7D 6.2 1.4 0.1 0.3 t1/ 1Alternative 7D 6.8 1.7 0.3 t1/ 1Proposed – Comparison portion for Alternative 7E 3.8 2.0 0.5 

Alternative 7E 4.5 2.3 0.7 0Proposed – Comparison portion for Alternative 7F 10.5 3.6 2.8 t

Alternative 7F 10.8 2.7 2.9 1Proposed – Comparison portion for Alternative 7G 3.3 2.1 0

Alternative 7G 3.4 0.8 1Proposed – Comparison portion for Alternative 7K 118.2 34.8 1.7 1.1 0.5 7.6 2.5 2.4 0.3 9

Alternative 7K 148.1 48.8 5.2 6.1 3.0 0.9 17.7 4.5 4.6 0.6 2Proposed – Total Length 131.5 38.1 2.9 0.8 0.4 0.7 0.3 3Proposed – Comparison portion for Alternative 8A 51.9 21.8 t1/ t1/ 0.1 6

Alternative 8A 53.6 3.2 0.1 0.3 1

Proposed – Comparison portion for Alternative 8B 45.3 5.4 2.8 0.8 0.2 0.2 1

Alternative 8B 45.8 7.1 0.5 0.3 9Proposed – Comparison portion for Alternative 8C 6.5 0.8 t1/ 2

Alternative 8C 6.4 2.2 t1/ 0Proposed – Comparison portion for Alternative 8D 6.9 0Alternative 8D 8.1 0Proposed – Comparison portion for Alternative 8E 7.0 0.5 0.1 3

Alternative 8E 18.3 1.7 9Proposed – Total Length 162.2 33.8 19.5 3.5 t1/ 2.9 t1/ 0.5 0.7 2

Proposed – Comparison portion for Alternative 9A 7.8 1.5 t1/ 2

Alternative 9A 7.7 1.4 t1/ 4Proposed – Comparison portion for Alternative 9B 49.1 11.2 t1/ 0.5 t1/ t1/ 0.3 1

Alternative 9B 52.3 2.8 3.4 0.2 t1/ 1

Proposed – Comparison portion for Alternative 9C 14.4 6.5 0.5 t1/ t1/ 0.3 1

Alternative 9C 14.4 0.2 t1/ 5

Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 12.7 17.7 3.3 t1/ 0.4 0.4 3

Alternative 9D 60.1 8.5 1.1 0.4 t1/ 0.1 1Alternative 9F 63.3 10.8 3.5 1.0 0.4 14

Alternative 9G 57.8 6.7 2.2 0.4 t1/ 0.1 1

Alternative 9H 61.0 9.1 4.6 1.0 0.4 1

Proposed – Comparison portion for Alternative 9E (revised) 61.4 15.8 17.7 3.3 t1/ 0.4 0.4 4

Alternative 9E (revised) 70.6 29.4 10.2 1.8 0.2 1

10 Proposed – Total Length 34.4 2.0 0.1 t1/ 7

417.2 30.6 38.8 34.6 3.3 3.9 17.3 20.1 12.0 13.3 3.5 10

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, Notes: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero miles or null value

1/ "t" indicates only a trace amount (<0.1 mile) crossed

D

8

Table D.6-1. Miles of Vegetation Types Crossed by the Proposed Routes and Alternatives cont.

7

Segment 

Number Proposed or Alternative Name

Segment 

Length 

(Miles)

Natural Vegetation

Total of All Proposed Segments (grey shaded areas)

9

Table D.6-1 Page 2 of 2

Gateway West Transmission Line Final EIS
Table D.6-2. Impacts (acres) to Vegetation from Construction

Construction 

Facilities

ROW Clearing1/

Total Impacts

Construction 

Facilities

ROW Clearing1/

Total Impacts

Construction 

Facilities

ROW Clearing1/

Total Impacts

Construction 

Facilities

ROW Clearing1/

Total Impacts

1W(a) Proposed – Total Length 73.8 480 30 5 3 t

2/ 4 3 8 10 15 26 11 14 25 7.9 2.6 10.5

Proposed – Comparison portion for Alternative 1W(a)-B 16.5 43 t

2/ 1 t2/ 1 1 1 1.9 2.4 4.4

Alternative 1W(a)-B 20.9 145 1 55 <1 2 2 <1 <1

1W(c) Proposed – Total Length 73.6 626 29 9 <1 2 23 37 59 20 19 39 4 5 9 8.3 3.2 11.5

Proposed – Total Length 91.9 1052 72 159 205 4 2 5 7 8.8 8.8

Proposed – Comparison portion for Alternative 2A 16.8 192 54 14 3.7 3.7

Alternative 2A 16.0 179 30 72 6 13.3 3.9 17.2

Proposed – Comparison portion for Alternative 2B 12.5 160 47 10 3.7 3.7

Alternative 2B 12.2 125 6 46 18.0 2.8 20.9

Segment 3 Proposed – Total Length 45.9 277 72 231 161 3.5 3.5

Segment 3A Proposed – Total Length 5.1 21 12 2.0 2.0

Proposed – Total Length 197.6 2470 28 149 183 20 1 24 31 58 89 147 230 377 28 57 86 122.0 4.3 126.3

Proposed – Comparison portion for Alternatives 4B-4F 85.2 1314 20 21 94 4 6 16 29 45 1 2 3 70.0 1.6 71.6

Alternative 4B 100.2 1534 22 22 191 5 1 <1 1 1 2 3 49.4 0.5 49.9

Alternative 4C 101.6 1479 22 24 194 5 <1 <1 1 2 3 46.4 0.5 46.9

Alternative 4D 100.8 1550 22 24 199 5 1 1 2 2 4 1 2 3 49.5 0.5 50.0

Alternative 4E 102.2 1475 22 26 203 5 1 1 1 2 3 1 2 3 46.6 0.5 47.1

Alternative 4F 87.5 1340 20 21 90 1 6 21 24 45 16 28 44 1 2 3 56.2 2.6 58.8

Proposed – Total Length 55.7 496 8 <1 88 79 167 74 94 169 98 110 208 6.4 6.4

Proposed – Comparison portion for Alternatives 5A,B 22.3 194 8 <1 924/ 76 168 40 52 92 29 12 41 <1 <1

Alternative 5A 29.7 257 1 46 44 90 70 66 136 16 32 48 1.0 <1 1.4

Alternative 5B 40.4 350 15 16 23 40 33 40 74 31 39 70 1.3 1.0 2.2

Proposed – Comparison portion for Alternative 5C 32.9 289 4 <1 92 76 168 74 93 167 62 48 110 3.1 3.1

Alternative 5C 26.0 94 11 3 3 6 27 36 63 39 55 94 5.8 1.0 6.8

Proposed – Comparison portion for Alternative 5D 19.2 193 <1 <1 34 42 76 35 39 74 4.3 4.3

Alternative 5D 17.0 70 1 1 t

2/ 2 2 81 74 155 t2/ t2/ 2.4 1.2 3.6

Proposed – Comparison portion for Alternative 5E 5.8 57 3 3 6 1.4 1.4

Alternative 5E 5.3 44 <1 <1 <1 <1

6 Proposed – Total Length 0.5 17

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

Notes: Blank cells indicate zero acres or null value

2/ "t" indicates only a trace amount (<0.1 acre) of impact

3/ Alternative 4G was added in late 2012 and was therefore not added to this table

4/ Disturbance acreage is greater than that in the Proposed Route due to an additional pulling and tensioning site

Segment 

Number Proposed or Alternative Name

Segment 

Length 

(Miles)

SagebrushSaltbushGreasewoodDwarf ShrubOther ShrubNative GrassMisc.

Conifer Forest Deciduous Forest Juniper Wetland/Riparian

1W

2

4

3/

5

3

1/ ROW Clearing limited to tall vegetation that may impact transmission line safety

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), Proposed 8 (including 8B), Proposed 9 (including 9E), and Proposed 10

Table D.6-2 Page 1 of 4

Gateway West Transmission Line Final EIS
Table D.6-2. Impacts (acres) to Vegetation from Construction cont.

Construction 

Facilities

ROW Clearing1/

Total Impacts

Construction 

Facilities

ROW Clearing1/

Total Impacts

Construction 

Facilities

ROW Clearing1/

Total Impacts

Construction 

Facilities

ROW Clearing1/

Total Impacts

Proposed – Total Length 118.2 601 20 16 4 t

2/ 78 55 133 49 55 105 115 163 278 6.1 6.1

Proposed – Comparison portion for Alternatives 7A,B 35.1 258 16 2 t

2/ 67 55 122 48 55 104 40 47 87 <1 <1

Alternative 7A 37.7 316 <1 63 62 125 67 64 131 20 24 44 8.6 <1 8.9

Alternative 7B 46.2 423 11 20 35 55 20 24 44 24 21 45 1.5 1.5

Proposed – Comparison portion for Alternative 7C 20.1 63 20 <1 <1

Alternative 7C 20.3 11

Proposed – Comparison portion for Alternative 7D 6.2 17 2 3 6 9 3.6 3.6

Alternative 7D 6.8 21 1 3 5 8 3.9 3.9

Proposed – Comparison portion for Alternative 7E 3.8 37 4 10 14

Alternative 7E 4.5 41 9 17 26

Proposed – Comparison portion for Alternative 7F 10.5 65 45 58 103 <1 <1

Alternative 7F 10.8 53 50 61 111 <1 <1

Proposed – Comparison portion for Alternative 7G 3.3 26 t

2/

t

2/

Alternative 7G 3.4 20 1.1 1.1

Proposed – Comparison portion for Alternative 7K 118.2 600 20 16 4 t

2/ 78 55 133 49 55 105 114 163 278 6.0 6.0

Alternative 7K 148.1 964 75 71 53 9 t

2/ 86 109 195 80 95 176 253 396 649 15.1 1.3 16.4

Proposed – Total Length 131.5 772 63 20 4 3 8.9 t

2/ 9.0

Proposed – Comparison portion for Alternative 8A 51.9 392 2.1 t

2/ 2.1

Alternative 8A 53.6 74 2 2.2 4.8 7.0

Proposed – Comparison portion for Alternative 8B 45.3 108 63 20 2 <1 1.0

Alternative 8B 45.8 143 8 1 7.9 <1 8.3

Proposed – Comparison portion for Alternative 8C 6.5 30 <1 <1

Alternative 8C 6.4 40 <1 t

2/

t

2/

Proposed – Comparison portion for Alternative 8D 6.9 t

2/

t

2/

Alternative 8D 8.1 t

2/

t

2/

Proposed – Comparison portion for Alternative 8E 7.0 14

Alternative 8E 18.3 50 <1 <1

Proposed – Total Length 162.2 610 329 70 <1 61 6 <1 <1 <1 6.0 t

2/ 6.0

Proposed – Comparison portion for Alternative 9A 7.8 16 <1 <1

Alternative 9A 7.7 24 <1 <1

Proposed – Comparison portion for Alternative 9B 49.1 207 38 4 <1 <1 <1 <1 <1

Alternative 9B 52.3 68 68 12 <1 <1 1.0

Proposed – Comparison portion for Alternative 9C 14.4 115 38 4 <1 <1 <1 <1 <1

Alternative 9C 14.4 18

Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 236 292 66 <1 3 5.1 5.1

Alternative 9D 60.1 167 16 3 <1 <1 <1 2.6 2.6

Alternative 9F 63.3 205 53 16 6.7 6.7

Alternative 9G 57.8 112 49 3 <1 <1 <1 4.0 4.0

Alternative 9H 61.0 150 86 16 7.3 7.3

Proposed – Comparison portion for Alternative 9E (revised) 61.4 298 294 69 <1 3 5 5

Alternative 9E (revised) 70.6 520 172 28 t

2/ 2 2

10 Proposed – Total Length 34.4 31 <1 1.0

7453 564 719 558 50 72 40 224 232 456 301 415 716 258 354 612 180.7 10.1 190.9

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

Notes: Blank cells indicate zero acres or null value

2/ "t" indicates only a trace amount (<0.1 acre) of impact

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), Proposed 8 (including 8B), Proposed 9 (including 9E), and Proposed 10

Segment 

Number Proposed or Alternative Name

Segment 

Length 

(Miles)

SagebrushSaltbushGreasewoodDwarf ShrubOther ShrubNative GrassMisc.

Conifer Forest Deciduous Forest Juniper Wetland/Riparian

1/ ROW Clearing limited to tall vegetation that may impact transmission line safety

Total of All Proposed Segments (grey shaded areas)

7

8

9

Table D.6-2 Page 2 of 4

Gateway West Transmission Line Final EIS
Table D.6-2. Impacts (acres) to Vegetation from Construction cont.

Construction 

Facilities

ROW Clearing1/

1W(a) Proposed – Total Length 73.8 41 72 77 16 <1 18 552 35 

Proposed – Comparison portion for Alternative 1W-B 16.5 14 61 9 16 1 47 3 Alternative 1W-B 20.9 12 44 14 t2/ <1 201 2 

1W(c) Proposed – Total Length 73.6 69 116 21 1 3 26 721 64 

Proposed – Total Length 91.9 134 2 50 13 80 1,502 5 

Proposed – Comparison portion for Alternative 2A 36.9 24 t2/ 13 2 7 264 

Alternative 2A 16.0 37 10 <1 7 300 4 

Proposed – Comparison portion for Alternative 2B 12.5 2 t2/ 9 2 4 220 

Alternative 2B 12.2 842 t2/ 195 3 

Segment 3 Proposed – Total Length 45.9 44 1 15 2 28 745 

Segment 3A Proposed – Total Length 5.1 14 11 <1 <1 34 Proposed – Total Length 197.6 108 147 92 258 9 81 3,202 350 

Proposed – Comparison portion for Alternatives 4B-4F 85.2 55 42 28 37 7 <1 1,545 33 

Alternative 4B 100.2 92 19 51 90 4 1 1,825 3 

Alternative 4C 101.6 119 17 49 112 4 1 1,771 3 

Alternative 4D 100.8 92 19 49 91 4 1 1,853 5 

Alternative 4E 102.2 119 17 47 113 4 1 1,779 4 

Alternative 4F 87.5 39 41 29 45 3 <1 1,571 57 

Proposed – Total Length 55.7 55 52 46 251 2 1 771 283 

Proposed – Comparison portion for Alternatives 5A,B 22.3 2 6 3 85 1 363 140 

Alternative 5A 29.7 17 70 14 151 <1 392 142 

Alternative 5B 40.4 72 45 9 268 2 447 103 

Proposed – Comparison portion for Alternative 5C 32.9 51 18 11 127 <1 524 217 

Alternative 5C 26.0 230 12 6 81 t2/ 2 180 95 

Proposed – Comparison portion for Alternative 5D 19.2 53 16 34 113 2 <1 266 81 

Alternative 5D 17.0 80 13 18 144 2 <1 159 75 Proposed – Comparison portion for Alternative 5E 5.8 7 10 26 68 2 t2/ 61 3 

Alternative 5E 5.3 4 8 43 62 2 1 45 

6 Proposed – Total Length 0.5 26 12 9 <1 17 

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero acres or null value

2/ "t" indicates only a trace amount (<0.1 acre) of impact3/ Alternative 4G was added in late 2012 and was therefore not added to this table

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B

1/ ROW Clearing limited to tall vegetation that may impact transmission line safety

2

43/

53

1W

Disturbed 

Grassland

Disturbed/

Developed

Agriculture

Water

No Vegetation DataTotal Natural Veg

Segment Number Proposed or Alternative Name Segment Length (Miles)

Disturbed 

Sagebrush

Table D.6-2 Page 3 of 4

Gateway West Transmission Line Final EIS
Construction 

Facilities

ROW Clearing1/

Proposed – Total Length 118.2 201 244 55 841 <1 22 889 274 

Proposed – Comparison portion for Alternatives 7A,B 35.1 17 31 12 160 1 432 158 

Alternative 7A 37.7 62 48 20 169 <1 475 150 Alternative 7B 46.2 86 22 15 295 2 500 79 Proposed – Comparison portion for Alternative 7C 20.1 100 28 2 159 <1 <1 83 Alternative 7C 20.3 137 115 4 95 <1 <1 11 Proposed – Comparison portion for Alternative 7D 6.2 25 33 4 46 t2/ t2/ 26 6 

Alternative 7D 6.8 26 46 2 50 t2/ t2/ 28 5 

Proposed – Comparison portion for Alternative 7E 3.8 17 t2/ 13 t2/ 41 10 

Alternative 7E 4.5 12 19 1 13 t2/ 50 17 

Proposed – Comparison portion for Alternative 7F 10.5 4 45 <1 65 1 110 58 

Alternative 7F 10.8 27 45 3 34 1 103 61 Proposed – Comparison portion for Alternative 7G 118.2 23 2 14 t2/ 26 

Alternative 7G 3.4 33 7 26 t2/ 21 Proposed – Comparison portion for Alternative 7K 118.2 201 244 55 841 <1 21 887 274 

Alternative 7K 148.1 445 437 63 264 3 41 1,607 602 

Proposed – Total Length 131.5 548 782 44 267 3 5 870 t2/ 

Proposed – Comparison portion for Alternative 8A 51.9 137 177 14 233 2 4 395 t2/ 

Alternative 8A 53.6 375 185 14 324 <1 1 78 5 

Proposed – Comparison portion for Alternative 8B 45.3 287 365 21 30 <1 <1 195 Alternative 8B 45.8 211 226 47 271 2 <1 160 <1 Proposed – Comparison portion for Alternative 8C 6.5 56 74 3 t2/ 30 

Alternative 8C 6.4 15 68 17 t2/ 40 Proposed – Comparison portion for Alternative 8D 6.9 11 130 7 t2/ t2/ t2/ Alternative 8D 8.1 7 141 7 19 t2/ t2/ t2/ Proposed – Comparison portion for Alternative 8E 7.0 51 47 3 10 t2/ 14 Alternative 8E 18.3 179 98 3 <1 3 50 Proposed – Total Length 162.2 496 1227 77 406 2 2 1,084 1 

Proposed – Comparison portion for Alternative 9A 7.8 40 71 19 <1 t2/ 17 

Alternative 9A 7.7 74 45 14 3 1 <1 25 

Proposed – Comparison portion for Alternative 9B 49.1 196 520 24 46 t2/ 1 249 1 

Alternative 9B 52.3 161 417 11 224 4 <1 148 <1 

Proposed – Comparison portion for Alternative 9C 14.4 12 117 15 1 158 1 

Alternative 9C 14.4 80 135 12 75 t2/ <1 18 

Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 69 216 24 233 1 <1 602 

Alternative 9D 60.1 286 516 24 27 <1 4 189 1 

Alternative 9F 63.3 277 433 32 135 4 4 281 

Alternative 9G 57.8 340 486 23 36 2 3 168 1 

Alternative 9H 61.0 327 403 30 139 4 <1 259 

Proposed – Comparison portion for Alternative 9E (revised) 61.4 90 215 24 233 1 1 668 

Alternative 9E (revised) 70.6 272 267 12 15 3 722 

10 Proposed - Total Length 34.4 115 174 27 316 4 2 32 

1,826 2,843 527 2,356 46 264 10,419 1,011 

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero acres or null value

2/ "t" indicates only a trace amount (<0.1 acre) of impact

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B

9

Disturbed 

Grassland

Disturbed/

Developed

Agriculture

1/ ROW Clearing limited to tall vegetation that may impact transmission line safety

Total of All Proposed Segments (grey shaded areas)

78

No Vegetation DataTotal Natural Veg

Segment Number Proposed or Alternative Name Segment Length (Miles)

Disturbed 

Sagebrush

Water

Table D.6-2. Impacts (acres) to Vegetation from Construction cont.

Table D.6-2 Page 4 of 4

Gateway West Transmission Line Final EIS
Operations 

Facilities

ROW 

Maintenance1/

1W(a) Proposed – Total Length 73.8 97 14 1 1 t2/ 1 5 

Proposed – Comparison portion for Alternative 1W(a)-B 16.5 7 t2/ <1 t2/ 

Alternative 1W(a)-B 20.9 24 <1 7 

1W(c) Proposed – Total Length 73.6 77 7 1 t2/ <1 4 49 

Proposed – Total Length 91.9 124 5 32 29 1 

Proposed – Comparison portion for Alternative 2A 16.8 15 5 1 Alternative 2A 16.0 17 3 9 1 Proposed – Comparison portion for Alternative 2B 12.5 12 5 <1 Alternative 2B 12.2 10 1 5 

Segment 3 Proposed – Total Length 45.9 70 12 28 14 Segment 3A Proposed – Total Length 5.1 2 2 Proposed – Total Length 197.6 344 <1 39 20 2 t2/ 2 5 72 

Proposed – Comparison portion for Alternatives 4B-4F 85.2 164 2 11 1 1 

Alternative 4B 100.2 202 t2/ 2 28 1 Alternative 4C 101.6 191 t2/ 2 30 1 Alternative 4D 100.8 207 t2/ 2 29 1 <1 Alternative 4E 102.2 192 t2/ 2 31 1 <1 Alternative 4F 87.5 171 2 10 <1 1 2 32 Proposed – Total Length 55.7 93 2 t2/ 13 107 

Proposed – Comparison portion for Alternatives 5A,B 22.3 25 2 t2/ 13 107 

Alternative 5A 29.7 35 <1 6 59 Alternative 5B 40.4 43 2 3 31 Proposed – Comparison portion for Alternative 5C 32.9 39 1 t2/ 13 107 

Alternative 5C 26.0 12 2 1 3 Proposed – Comparison portion for Alternative 5D 19.2 34 t2/ 

Alternative 5D 17.0 20 <1 t2/ t2/ <1 

Proposed – Comparison portion for Alternative 5E 5.8 16 

Alternative 5E 5.3 16 

6 Proposed – Total Length 0.5 15

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero acres or null value

2/ "t" indicates only a trace amount (<0.1 acre) of impact3/ Alternative 4G was added in late 2012 and was therefore not added to this table

43/

5

1/ ROW Clearing limited to tall vegetation that may impact transmission line safety

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, a

2

Native Grass

Misc.

Conifer F

Dwarf Shrub Segment Number Proposed or Alternative Name Segment Length (Miles)

Sagebrush

Saltbush

Greasewood

Other Shrub

3

Table D.6-3. Impacts (acres) to Vegetation from Operation

1W

Table D.6-3 Page 1 of 4

Gateway West Transmission Line Final EIS
Operations 

Facilities

ROW 

Maintenance1/

Proposed – Total Length 118.2 88 2 2 <1 t2/ 14 74 

Proposed – Comparison portion for Alternatives 7A,B 35.1 26 2 <1 t2/ 10 74 Alternative 7A 37.7 38 t2/ 8 90 

Alternative 7B 46.2 46 2 3 44 Proposed – Comparison portion for Alternative 7C 20.1 7 2 

Alternative 7C 20.3 1Proposed – Comparison portion for Alternative 7D 6.2 2 <1 Alternative 7D 6.8 2 <1 Proposed – Comparison portion for Alternative 7E 3.8 3 

Alternative 7E 4.5 4 

Proposed – Comparison portion for Alternative 7F 10.5 6 

Alternative 7F 10.8 5 Proposed – Comparison portion for Alternative 7G 3.3 3 Alternative 7G 3.4 1 Proposed – Comparison portion for Alternative 7K 118.2 88 2 2 <1 t2/ 14 74 

Alternative 7K 148.1 139 7 9 9 2 t2/ 14 138 Proposed – Total Length 131.5 74 6 1 <1 <1 

Proposed – Comparison portion for Alternative 8A 51.9 43 

Alternative 8A 53.6 5 <1 Proposed – Comparison portion for Alternative 8B 45.3 9 6 1 <1 Alternative 8B 45.8 12 1 Proposed – Comparison portion for Alternative 8C 6.5 2 

Alternative 8C 6.4 3 t2/ Proposed – Comparison portion for Alternative 8D 6.9Alternative 8D 8.1Proposed – Comparison portion for Alternative 8E 7.0 1Alternative 8E 18.3 6

9 Proposed – Total Length 162.2 59 33 9 t2/ 8 1 

Proposed – Comparison portion for Alternative 9A 7.8 1 

Alternative 9A 7.7 2 Proposed – Comparison portion for Alternative 9B 49.1 24 4 Alternative 9B 52.3 3 9 1 

Proposed – Comparison portion for Alternative 9C 14.4 11 5 

Alternative 9C 14.4 1

Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 22 31 8 t2/ 1 

Alternative 9D 60.1 15 1 <1 

Alternative 9F 63.3 19 5 1 

Alternative 9G 57.8 7 4 <1 

Alternative 9H 61.0 11 8 1 

Proposed – Comparison portion for Alternative 9E (revised) 61.4 27 31 9 t2/ 1 

Alternative 9E (revised) 70.6 48 22 4 

10 Proposed – Total Length 34.4 4 

1048 56 135 63 6 10 4 36 306 

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero acres or null value

2/ "t" indicates only a trace amount (<0.1 acre) of impact

Total of All Proposed Segments (grey shaded areas)

1/ ROW Clearing limited to tall vegetation that may impact transmission line safety

78

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, a

Native Grass

Misc.

Conifer F

Table D.6-3. Impacts (acres) to Vegetation from Operation cont. 

Segment 

Number Proposed or Alternative Name

Segment 

Length 

(Miles)

Sagebrush

Saltbush

Greasewood

Dwarf Shrub

Other Shrub

Table D.6-3 Page 2 of 4

Gateway West Transmission Line Final EIS
Operations 

Facilities

ROW 

Maintenance1/

Total Impacts

1W(a) Proposed – Total Length 8 18 25 3 t2/ 5 118 46 164 54 

Proposed – Comparison portion for Alternative 1W-A 2 12 3 3 <1 8 4 11 20 

Alternative 1W-A 2 7 4 t2/ 31 2 33 12 

1W(c) Proposed – Total Length 8 11 6 t2/ <1 6 92 86 178 25 

Proposed – Total Length 17 <1 15 1 20 192 6 198 33 

Proposed – Comparison portion for Alternative 2A 2 t2/ 3 2 21 21 5 

Alternative 2A 4 3 t2/ 2 31 4 34 7 

Proposed – Comparison portion for Alternative 2B 1 t2/ 2 1 17 17 3 

Alternative 2B 1 1 15 3 18 2 

3 Proposed – Total Length 4 t2/ 3 <1 8 125 125 7 

3A Proposed – Total Length 4 4 t2/ t2/ 4 48

Proposed – Total Length 16 14 24 16 1 16 442 451 893 70 Proposed – Comparison portion for Alternatives 4A-4F 9 7 8 3 1 186 41 226 26 Alternative 4B 15 3 12 8 <1 t2/ 235 4 239 38 

Alternative 4C 17 3 11 9 <1 t2/ 225 3 229 40 Alternative 4D 15 3 11 8 <1 t2/ 242 6 249 38 Alternative 4E 17 3 11 10 <1 t2/ 229 6 235 40 Alternative 4F 5 7 8 3 t2/ 192 73 265 23 

Proposed – Total Length 5 5 6 19 1 <1 132 385 517 35 Proposed – Comparison portion for Alternatives 5A,B 1 1 1 7 <1 49 197 246 9 Alternative 5A 1 5 5 13 55 188 243 25 Alternative 5B 8 2 3 24 54 142 196 37 Proposed – Comparison portion for Alternative 5C 5 2 3 10 73 303 376 20 Alternative 5C 21 1 2 7 <1 24 131 155 31 Proposed – Comparison portion for Alternative 5D 5 1 4 8 1 44 111 155 18 Alternative 5D 9 2 4 11 1 26 105 131 25 Proposed – Comparison portion for Alternative 5E <1 <1 2 4 1 16 4 20 7 Alternative 5E <1 <1 4 2 1 t2/ 16 16 7 

6 Proposed – Total Length 25 11 9 15 15 37 

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero acres or null value

2/ "t" indicates only a trace amount (<0.1 acre) of impact3/ Alternative 4G was added in late 2012 and was therefore not added to this table

43/

5

1/ ROW Clearing limited to tall vegetation that may impact transmission line safety

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, a

1W

2

Water

No Vegetation 

Data

Segment 

Number Proposed or Alternative Name

Disturbed 

Sagebrush

Disturbed 

Grassland

Disturbed /

Developed

Agriculture

Table D.6-3. Impacts (acres) to Vegetation from Operation cont. 

Total Natural Vegetation

Total 

Disturbed a

Semi-natu

Vegatatio

Table D.6-3 Page 3 of 4

Gateway West Transmission Line Final EIS
Operations 

Facilities

ROW 

Maintenance1/

Total Impacts

Proposed – Total Length 20 21 12 78 t2/ 5 128 365 492 132 

Proposed – Comparison portion for Alternatives 7A,B 1 3 3 12 <1 52 208 260 20 

Alternative 7A 8 4 4 15 61 209 270 32 Alternative 7B 11 <1 3 24 58 106 164 38 Proposed – Comparison portion for Alternative 7C 13 3 <1 11 9 9 27 

Alternative 7C 12 8 1 6 t2/ 1 127 

Proposed – Comparison portion for Alternative 7D 2 4 1 2 t2/ 3 8 10 9 Alternative 7D 2 5 1 2 t2/ 3 7 10 10 Proposed – Comparison portion for Alternative 7E 1 t2/ <1 4 13 16 2 

Alternative 7E 1 2 <1 <1 5 22 27 4 

Proposed – Comparison portion for Alternative 7F <1 4 t2/ 7 11 81 92 12 

Alternative 7F 3 5 1 5 9 85 95 14 Proposed – Comparison portion for Alternative 7G 1 <1 2 3 3 3 

Alternative 7G 2 <1 3 1 1 5 

Proposed – Comparison portion for Alternative 7K 20 21 12 78 t2/ 5 128 365 492 132 

Alternative 7K 61 36 15 38 1 10 221 792 1,013 150 

Proposed – Total Length 63 75 10 16 <1 1 83 t2/ 83 164 

Proposed – Comparison portion for Alternative 8A 17 22 3 15 <1 1 43 t2/ 43 57 Alternative 8A 42 28 4 23 t2/ 1 5 6 11 97 

Proposed – Comparison portion for Alternative 8B 32 31 6 <1 t2/ 17 17 70 

Alternative 8B 22 19 4 11 t2/ t2/ 13 <1 14 56 Proposed – Comparison portion for Alternative 8C 7 6 <1 2 2 13 Alternative 8C 4 9 1 3 3 13 Proposed – Comparison portion for Alternative 8D 1 12 2 t2/ 15 Alternative 8D 1 11 2 2 t2/ 15 Proposed – Comparison portion for Alternative 8E 5 3 <1 <1 1 1 9 Alternative 8E 13 7 <1 t2/ 6 620 

9 Proposed – Total Length 71 131 12 35 <1 1 111 1 112 248 

Proposed – Comparison portion for Alternative 9A 4 8 2 t2/ 1 113 Alternative 9A 7 4 1 1 <1 t2/ 2 2 13 

Proposed – Comparison portion for Alternative 9B 29 60 3 <1 t2/ 1 28 1 29 93 

Alternative 9B 19 36 1 14 <1 12 <1 13 71 

Proposed – Comparison portion for Alternative 9C 2 7 2 1 15 1 16 11 

Alternative 9C 9 10 2 4 t2/ t2/ 1 125 

Proposed – Comparison portion for Alternatives 9D,F,G,H 9 16 5 14 <1 62 62 44 Alternative 9D 24 38 4 2 <1 16 1 18 67 Alternative 9F 22 33 5 8 t2/ t2/ 26 26 67 

Alternative 9G 31 37 4 3 t2/ <1 11 1 13 75 

Alternative 9H 29 33 5 9 t2/ t2/ 21 21 75 

Proposed – Comparison portion for Alternative 9E (revised) 13 16 5 14 <1 t2/ 69 69 47 

Alternative 9E (revised) 33 24 3 1 t2/ 74 74 61 

10 Proposed – Total Length 9 16 11 33 <1 <1 4 4 69 

224 318 139 200 13 64 1,446 1,340 2,786 882 

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero acres or null value

2/ "t" indicates only a trace amount (<0.1 acre) of impact

Total of All Proposed Segments (grey shaded areas)

1/ ROW Clearing limited to tall vegetation that may impact transmission line safety

78

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, a

Water

No Vegetation DataTotal Natural Vegetation Total Disturbed a

Semi-natu

Vegetatio

Segment Number Proposed or Alternative Name

Disturbed 

Sagebrush

Disturbed 

Grassland

Disturbed /

Developed

Agriculture

Table D.6-3. Impacts (acres) to Vegetation from Operation cont. 

Table D.6-3 Page 4 of 4

Gateway West Transmission Line Final EIS
Table D.6-5. Construction Impacts to Vegetation (in acres) on Federal Lands

Construction 

Facilities

ROW 

Clearing

Con

F

Casper 51 <1 1 Rawlins 193 

Alternative 1W(a)-B Casper <1 

Casper 32 7 12 Rawlins 235 

Proposed – Total Length Rawlins 669 <1 4 Proposed – Comparison portion for Alternative 2A Rawlins 104 

Alternative 2A Rawlins 122 Proposed – Comparison portion for Alternative 2B Rawlins 93 

Alternative 2B Rawlins 62 

Rawlins 180 Rock Springs 188 

Segment 3A Proposed – Total Length Rock Springs 22 

Kemmerer 759 12 21 Pocatello 87 10 12 Rock Springs 427 Kemmerer 759 12 21 Pocatello 24 

Rock Springs 18 Kemmerer 847 2 3 

Pocatello 58 Rock Springs 78 

Kemmerer 806 1 2 

Pocatello 44 Rock Springs 78 

Kemmerer 897 4 4 

Pocatello 58 Rock Springs 79 

Kemmerer 845 3 4 

Pocatello 41 Rock Springs 79 

Kemmerer 752 37 52 

Pocatello 32 

Rock Springs 18 Burley 23 Pocatello 69 102 144 

Proposed – Comparison portion for Alternatives 5A,B Pocatello 34 76 87 

Alternative 5A Pocatello 77 102 109 

Alternative 5B Pocatello 113 53 66 Proposed – Comparison portion for Alternative 5C Pocatello 43 88 109 

Alternative 5C Pocatello <1 4 

Burley 23 21 Pocatello 9 11 

Alternative 5D Burley 2 

Burley 23 Pocatello 

Alternative 5E Burley 12 

6 Proposed – Total Length No BLM Land Crossed

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero acres or null value

1/ "t" indicates only a trace amount (<0.1 acre) of occupancy 2/ Alternative 4G was added in late 2012 and was therefore not added to this table

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7

35

Proposed – Total LengthProposed – Comparison portion for Alternatives 4B-4F

1W

1W(a) Proposed – Total Length1W(c) Proposed – Total Length

2

Segment 3 Proposed – Total Length

42/

Proposed – Total LengthAlternative 4BAlternative 4C

Forest/Woodland 

Alternative 4E

Segment 

Number Proposed or Alternative Name

Bureau of Land Management Field Office Shrubland

Alternative 4FAlternative 4DProposed – Comparison portion for Alternative 5DProposed – Comparison portion for Alternative 5E

Table D.6-5 Page 1 of 4

Gateway West Transmission Line Final EIS
Table D.6-5. Construction Impacts to Vegetation (in acres) on Federal Lands cont.

Construction 

Facilities

ROW 

Clearing

Con

F

Burley 242 35 37 

Pocatello 66 83 85 

Proposed – Comparison portion for Alternatives 7A,B Pocatello 49 83 85 

Alternative 7A Pocatello 45 102 100 Alternative 7B Pocatello 107 33 40 Proposed – Comparison portion for Alternative 7C Burley 147 

Alternative 7C Burley 106 

Proposed – Comparison portion for Alternative 7D Burley 1 1 

Alternative 7D Burley 

Proposed – Comparison portion for Alternative 7E Burley 3 2 4 

Alternative 7E Burley 24 2 7 Proposed – Comparison portion for Alternative 7F Burley 3 24 19 

Alternative 7F Burley 22 35 41 Proposed – Comparison portion for Alternative 7G Burley 45 

Alternative 7G Burley 45 

Burley 242 35 37 

Pocatello 66 83 85 

Burley 669 180 311 Pocatello 88 28 33 

Four Rivers 617 Owyhee 72 Shoshone 311 Four Rivers 89 

Shoshone 311 

Four Rivers 76 Jarbidge 175 

Shoshone 66 

Four Rivers 327 

Owyhee 72 Four Rivers 211 

Owyhee 1 

Proposed – Comparison portion for Alternative 8C Four Rivers 64 Alternative 8C Four Rivers 34 

Proposed – Comparison portion for Alternative 8D Four Rivers 10 Alternative 8D Four Rivers 4 

Proposed – Comparison portion for Alternative 8E Four Rivers 46 

Alternative 8E Four Rivers 223 

Bruneau 215 

Burley 212 

Four Rivers 101 

Jarbidge 378 1 1 

Owyhee 367 

Proposed – Comparison portion for Alternative 9A Burley 42 

Alternative 9A Burley 70 

Burley 6 

Jarbidge 376 1 1 Burley 40 

Jarbidge 219 Burley 6 

Jarbidge 111 1 1 

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

Notes: Blank cells indicate zero acres or null value

1/ "t" indicates only a trace amount (<0.1 acre) of occupancy3/ The actual route along Alternative 8B would avoid federal lands; therefore, reported impact acreages along Alternative 8B are conservative

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7

8

Proposed – Total LengthAlternative 8AAlternative 8B3/

Shrubland

Forest/Woodland 

Proposed – Total LengthAlternative 7K

Segment 

Number Proposed or Alternative Name

Bureau of Land Management Field Office

Proposed – Comparison portion for Alternative 9BProposed – Comparison portion for Alternative 9CAlternative 9BProposed – Comparison portion for Alternative 7KProposed – Comparison portion for Alternative 8A

9

Proposed – Total LengthProposed – Comparison portion for Alternative 8B

7

Table D.6-5 Page 2 of 4

Gateway West Transmission Line Final EIS
Table D.6-5. Construction Impacts to Vegetation (in acres) on Federal Lands cont.

Construction 

Facilities

ROW 

Clearing

Con

F

Burley 40 

Jarbidge t1/ 

Bruneau 215 

Four Rivers 87 Jarbidge 1 

Owyhee 235 

Bruneau 3 

Four Rivers 414 1 1 Owyhee 9 Bruneau 91 

Four Rivers 364 Jarbidge 1 

Owyhee 9 

Bruneau 3 Four Rivers 413 1 1 

Owyhee 12 

Bruneau 91 

Four Rivers 363 Jarbidge 1 

Owyhee 12 Bruneau 215 

Four Rivers 92 Jarbidge 1 

Owyhee 318 

Bruneau 412 Four Rivers 82 Jarbidge 24 

Owyhee 404 

10 Proposed – Total Length Shoshone 131 

5,649 251 316 

Construction 

Facilities

ROW 

Clearing

Con

F

Wa Proposed – Total Length Medicine Bow-Routt 17 1 1 

Wc Proposed – Total Length Medicine Bow-Routt 18 11 16 

4 Proposed – Total Length Caribou-Targhee 22 118 179 

7 Alternative 7K Sawtooth 117 109 155 

56 124 200 

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero acres or null value

1/ "t" indicates only a trace amount (<0.1 acre) of occupancy 

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7

Alternative 9F

9

(cont.)

Total of All Proposed Segments (grey shaded areas)

National Forest

Forest/Woodland

Segment 

Number Proposed or Alternative Name

Total of All Proposed Segments (grey shaded areas)

Proposed – Comparison portion for Alternative 9E (revised)Alternative 9E (revised)Alternative 9CProposed – Comparison portion for Alternatives 9D,F,G,HAlternative 9D

Segment 

Number

Alternative 9GAlternative 9H

Shrubland

1W

Proposed or Alternative Name 

Bureau of Land Management Field Office Shrubland

Forest/Woodland 

Table D.6-5 Page 3 of 4

Gateway West Transmission Line Final EIS
Table D.6-5. Construction Impacts to Vegetation (in acres) on Federal Lands cont.

Construction 

Facilities

ROW 

Clearing

Con

F

Proposed – Total Length Bureau of Reclamation 72 Proposed – Comparison portion for Alternatives 4B-4F Bureau of Reclamation 72 

Bureau of Reclamation 17 

Fish and Wildlife Service 1 

Bureau of Reclamation 17 Fish and Wildlife Service <1 Bureau of Reclamation 17 

Fish and Wildlife Service 1 

Bureau of Reclamation 17 Fish and Wildlife Service <1 

Alternative 4F Bureau of Reclamation 72 

5 Alternative 5C Indian Reservation 235 25 31 

Proposed – Total Length Bureau of Reclamation 44 Proposed – Comparison portion for Alternative 8B Bureau of Reclamation 31 Alternative 8B Bureau of Reclamation 16 

Proposed – Comparison portion for Alternative 8C Bureau of Reclamation 6 

Alternative 8C Bureau of Reclamation <1 

Proposed – Comparison portion for Alternative 8E Bureau of Reclamation 19 

Proposed – Total Length Military Reservations/Corps of Engineers 4 

Alternative 9G Bureau of Reclamation 26 

Alternative 9H Bureau of Reclamation 26 

121 

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero acres or null value

1/ "t" indicates only a trace amount (<0.1 acre) of occupancy 2/ Alternative 4G was added in late 2012 and was therefore not added to this table

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7

42/

Alternative 4BAlternative 4CAlternative 4D

9

Alternative 4E

Other Federal Lands

8

Proposed or Alternative Name

Total of All Proposed Segments (grey shaded areas)

Shrubland

Segment 

Number

Forest/Woodland

Table D.6-5 Page 4 of 4

Gateway West Transmission Line Final EIS
Table D.6-6. Operations Impacts to Vegetation (in acres) on Federal Lands

Operations Facilities ROW Maintenance Operation

Casper 11 t1/ 1 t

Rawlins 38 t

Alternative 1W(a)-B Casper t1/ 

Casper 6 1 16 t

Rawlins 26 t

Proposed – Total Length Rawlins 69 t1/ 5 0

Proposed – Comparison portion for Alternative 2A Rawlins 7 

Alternative 2A Rawlins 11 0Proposed – Comparison portion for Alternative 2B Rawlins 5 Alternative 2B Rawlins 5 

Rawlins 16 t

Rock Springs 25 t

Segment 3A Proposed – Total Length Rock Springs 4 t

Kemmerer 97 3 26 0Pocatello 9 1 17 t

Rock Springs 44 0Kemmerer 97 3 26 0

Pocatello 3 t

Rock Springs 4 Kemmerer 114 <1 4 0Pocatello 6 t

Rock Springs 9 t

Kemmerer 106 t1/ 3 0

Pocatello 6 t

Rock Springs 9 t

Kemmerer 122 1 6 0Pocatello 6 t

Rock Springs 10 t

Kemmerer 112 <1 5 0Pocatello 5 t

Rock Springs 10 t

Kemmerer 99 5 68 0Pocatello 4 tRock Springs 4 

Burley <1 

Pocatello 10 13 193 

Proposed – Comparison portion for Alternatives 5A,B Pocatello 6 9 121 

Alternative 5A Pocatello 10 15 147 t

Alternative 5B Pocatello 15 6 95 tProposed – Comparison portion for Alternative 5C Pocatello 7 10 149 

Alternative 5C Pocatello t1/ 1 

Burley <1 28 

Pocatello 2 1 

Alternative 5D Burley <1 

Proposed – Comparison portion for Alternative 5E Burley <1 

Alternative 5E Burley 1 t

6 Proposed – Total Length No BLM Land Crossed

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero acres or null value

1/ "t" indicates only a trace amount (<0.1 acre) of occupancy2/ Alternative 4G was added in late 2012 and was therefore not added to this table

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), 

Segment 3 Proposed – Total Length

Segment 

Number Proposed or Alternative Name Bureau of Land Management Field Office Shrubland

1W

1W(a) Proposed – Total Length1W(c) Proposed – Total Length

Forest/Woodland 

32

42/

Proposed – Total LengthAlternative 4BAlternative 4CAlternative 4DAlternative 4EAlternative 4FProposed – Comparison portion for Alternatives 4B-4F

5

Proposed – Total LengthProposed – Comparison portion for Alternative 5D

Table D.6-6 Page 1 of 4

Gateway West Transmission Line Final EIS
Table D.6-6. Operations Impacts to Vegetation (in acres) on Federal Lands cont.

Operations Facilities ROW Maintenance Operation

Burley 26 2 53 t

Pocatello 7 13 114 

Proposed – Comparison portion for Alternatives 7A,B Pocatello 6 13 114 

Alternative 7A Pocatello 7 16 138 t

Alternative 7B Pocatello 15 5 53 tProposed – Comparison portion for Alternative 7C Burley 17 Alternative 7C Burley 10 Proposed – Comparison portion for Alternative 7D Burley t1/ 1 t

Alternative 7D Burley 

Proposed – Comparison portion for Alternative 7E Burley <1 <1 5 

Alternative 7E Burley 3 <1 8 

Proposed – Comparison portion for Alternative 7F Burley <1 2 31 Alternative 7F Burley 3 3 57 Proposed – Comparison portion for Alternative 7G Burley 3 

Alternative 7G Burley 2 

Burley 26 2 53 t

Pocatello 7 13 114 

Burley 86 21 403 0Pocatello 13 5 44 0

Four Rivers 54 t

Owyhee 5 t

Shoshone 36 t

Four Rivers 8 t

Shoshone 36 t

Four Rivers 7 0

Jarbidge 15 

Shoshone 6 

Four Rivers 32 t

Owyhee 5 t

Four Rivers 20 t

Owyhee t1/ 

Proposed – Comparison portion for Alternative 8C Four Rivers 6 Alternative 8C Four Rivers 4 Proposed – Comparison portion for Alternative 8D Four Rivers 1 

Alternative 8D Four Rivers t1/ 

Proposed – Comparison portion for Alternative 8E Four Rivers 4 

Alternative 8E Four Rivers 18 

Bruneau 27 

Burley 22 Four Rivers 11 0Jarbidge 51 t1/ 1 t

Owyhee 38 t

Proposed – Comparison portion for Alternative 9A Burley 4 Alternative 9A Burley 6 

Burley <1 Jarbidge 51 t1/ 1 t

Burley 6 

Jarbidge 21 t

Burley <1 Jarbidge 11 t1/ 1 t

Burley 6 

Jarbidge t1/ 

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

Notes: Blank cells indicate zero acres or null value

1/ "t" indicates only a trace amount (<0.1 acre) of occupancy3/ The actual route along Alternative 8B would avoid federal lands; therefore, reported impact acreages along Alternative 8B are conservative

Proposed – Total Length

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), 

Proposed – Total LengthAlternative 8AAlternative 9B

Segment 

Number Proposed or Alternative Name

Proposed – Comparison portion for Alternative 7K

7

Proposed – Total Length

Alternative 7K

8

Alternative 8B3/

Bureau of Land Management Field Office

Forest/Woodland 

Shrubland

Proposed – Comparison portion for Alternative 8BSegment 9 Proposed - Comparison portion for Alternative 9CProposed – Comparison portion for Alternative 8A

9 Proposed – Comparison portion for Alternative 9B

Alternative 9C

Table D.6-6 Page 2 of 4

Gateway West Transmission Line Final EIS
Table D.6-6. Operations Impacts to Vegetation (in acres) on Federal Lands cont.

Operations Facilities ROW Maintenance Operation

Bruneau 27 

Four Rivers 7 0Jarbidge <1 

Owyhee 24 t

Bruneau <1 

Four Rivers 36 t1/ 1 t

Owyhee <1 

Bruneau 8 

Four Rivers 32 0Jarbidge <1 

Owyhee <1 

Bruneau <1 

Four Rivers 35 t1/ 1 t

Owyhee 1 

Bruneau 8 

Four Rivers 31 0

Jarbidge <1 

Owyhee 1 

Bruneau 27 

Four Rivers 8 0

Jarbidge <1 

Owyhee 33 t

Bruneau 42 t

Four Rivers 7 t

Jarbidge 2 

Owyhee 46 t

10 Proposed – Total Length Shoshone 11 

643 33 426 1

Operations Facilities ROW Maintenance Operation

Wa Proposed – Total Length Medicine Bow-Routt 3 <1 1 t

Wc Proposed – Total Length Medicine Bow-Routt 1 2 22 

4 Proposed – Total Length Caribou-Targhee 2 16 235 t

7 Alternative 7K Sawtooth 13 17 207 0

6 15 259 t

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero acres or null value

1/ "t" indicates only a trace amount (<0.1 acre) of occupancy

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), 

Bureau of Land Management Field Office Shrubland 

Forest/Woodland

Proposed – Comparison portion for Alternatives 9D,F,G,HProposed or Alternative Name

Alternative 9FAlternative 9DProposed – Comparison portion for Alternative 9E (revised)Alternative 9E (revised)

1W

Total of All Proposed Segments (grey shaded areas)

National Forest

9

(cont.)

Alternative 9H

Shrubland

Forest/Woodland 

Segment 

Number

Total of All Proposed Segments (grey shaded areas)

Segment 

Number Proposed or Alternative Name

Alternative 9G

Table D.6-6 Page 3 of 4

Gateway West Transmission Line Final EIS
Table D.6-6. Operations Impacts to Vegetation (in acres) on Federal Lands cont.

Operations Facilities ROW Maintenance Operation

Proposed – Total Length Bureau of Reclamation 9 t

Proposed – Comparison portion for Alternatives 4B-4F Bureau of Reclamation 9 t

Bureau of Reclamation 1 

Fish and Wildlife Service <1 Bureau of Reclamation 1 Fish and Wildlife Service t1/ t

Bureau of Reclamation 1 

Fish and Wildlife Service <1 Bureau of Reclamation 1 Fish and Wildlife Service t1/ t

Alternative 4F Bureau of Reclamation 9 t

5 Alternative 5C Indian Reservation 26 3 46 0

Proposed – Total Length Bureau of Reclamation 4 

Proposed – Comparison portion for Alternative 8B Bureau of Reclamation 3 

Alternative 8B Bureau of Reclamation 1 t

Proposed – Comparison portion for Alternative 8C Bureau of Reclamation <1 Alternative 8C Bureau of Reclamation t1/ 

Proposed – Comparison portion for Alternative 8E Bureau of Reclamation 2 Proposed – Total Length Military Reservations/Corps of Engineers 1 

Alternative 9G Bureau of Reclamation 1 

Alternative 9H Bureau of Reclamation 1 

14 t

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero acres or null value

1/ "t" indicates only a trace amount (<0.1 acre) of occupancy2/ Alternative 4G was added in late 2012 and was therefore not added to this table

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), 

Segment 

Number Proposed or Alternative Name

Forest/Woodland 

Alternative 4E

Other Federal Lands Shrubland 

9

42/

Alternative 4BAlternative 4CAlternative 4D

Total of All Proposed Segments (grey shaded areas)

8

Table D.6-6 Page 4 of 4

Gateway West Transmission Line Final EIS
1W(a) Proposed – Total Length 73.8 Shirley Basin 7/11/2010 

Proposed – Comparison portion for Alternative 1W(a)-B 16.5Alternative 1W(a)-B 20.91W(c) Proposed – Total Length 73.6Proposed – Total Length 91.9Proposed – Compare to Alternative 2A 16.8Alternative 2A 16.0Proposed – Compare to Alternative 2B 12.5Alternative 2B 12.2Segment 3 Proposed – Total Length 45.9Segment 3A Proposed – Total Length 5.1Proposed – Total Length 197.6Proposed – Compare to Alternatives 4B-4F 85.2Alternative 4B 100.2 Cigar 2 9/20/2011 

Alternative 4C 101.6 Cigar 2 9/21/2011 

Alternative 4D 100.8 Cigar 2 9/22/2011 

Alternative 4E 102.2 Cigar 2 9/23/2011 

Alternative 4F 87.5

Bowen 8/25/2010 

Downey West 7/29/2012 

Proposed – Compare to Alternatives 5A,B 22.3 Bowen 8/25/2010 

Alternative 5A 29.7 Bowen 8/25/2010 Alternative 5B 40.4Proposed – Compare to Alternative 5C 32.9 Bowen 8/25/2010 Alternative 5C 26.0 Bowen 8/25/2010 

Proposed – Compare to Alternative 5D 19.2Alternative 5D 17.0Proposed – Compare to Alternative 5E 5.8Alternative 5E 5.3

6 Proposed – Total Length 0.5

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero miles or null value

1/ "t" indicates only a trace amount (<0.1 acre) of impact2/ Alternative 4G was added in late 2012 and was therefore not added to this table

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B

54

Name of Fire Date of Fire

Proposed – Total Length 55.7

3

Table D.6-7. Wildland Fires Within the Analysis Area

1W

2

Segment Number Proposed or Alternative Name

Segment Length 

(Miles)

Table D.6-7 Page 1 of 5

Gateway West Transmission Line Final EIS
Bowen 8/25/2010 

Cave Canyon 8/5/2012 Dairy Canyon 9/13/2010 

Downey West 7/29/2012 

Highway 81-1 7/1/2010 

Highway 81-2 7/1/2010 

Mile Marker 225 7/19/2010 

MM 224 8/17/2010 

Raft River 7/11/2012 

Yale Road 7/26/2012 

Proposed – Compare to Alternatives 7A,B 35.1 Bowen 8/25/2010 

Bull Canyon 9/8/2011 

Bowen 8/25/2010 

Dairy Canyon 9/13/2010 

Alternative 7B 46.2 Dairy Canyon 9/13/2010 

MM 224 8/17/2010 

Raft River 7/11/2012 

Yale Road 7/26/2012 

MM 224 8/17/2010 

Rainbow Road 7/18/2010 

Yale Road 7/26/2012 

Highway 81-1 7/1/2010 

Highway 81-2 7/1/2010 

Mile Marker 225 7/19/2010 

MM 224 8/17/2010 

Highway 81-2 7/1/2010 

MM 224 8/17/2010 

Proposed – Compare to Alternative 7E 3.8Alternative 7E 4.5Proposed – Compare to Alternative 7F 10.5

Alternative 7F 10.8 Pine Knob 7/7/2011 

Proposed – Compare to Alternative 7G 3.3 Cave Canyon 8/5/2012 Alternative 7G 3.4 Cave Canyon 8/5/2012 

Bowen 8/25/2010 

Cave Canyon 8/5/2012 Dairy Canyon 9/13/2010 

Downey West 7/29/2012 

Highway 81-1 7/1/2010 Highway 81-2 7/1/2010 

Mile Marker 225 7/19/2010 

MM 224 8/17/2010 

Raft River 7/11/2012 

Yale Road 7/26/2012 

Cave Canyon 8/5/2012 

Downey West 7/29/2012 

Emery 8/26/2010 

Walker Hollow 8/21/2011 

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7BNotes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero miles or null value

1/ "t" indicates only a trace amount (<0.1 acre) of impact

7

Proposed – Comparison portion for Alternative 7K 118.2Proposed – Total LengthAlternative 7C 20.3Proposed – Compare to Alternative 7D 6.2Alternative 7D 6.8

Name of Fire Date of Fire

Alternative 7K

118.2

Alternative 7A 37.7Proposed – Compare to Alternative 7C

Table D.6-7. Wildland Fires Within the Analysis Area cont.

Segment Number Proposed or Alternative Name

Segment Length 

(Miles)

148.1

20.1

Table D.6-7 Page 2 of 5

Gateway West Transmission Line Final EIS
Eureka 7/11/2009 

Lucky 7/24/2010 

Nothot 7/2/2011 

Power Station 9/27/2009 

Benwalk 7/9/2012 

Blair 8/17/2011 

Lucky 7/24/2010 

Blair 8/17/2011 

Power Station 9/27/2009 

Benwalk 7/9/2012 

Ditto 7/7/2012 

Power 8/16/2011 

Shoestring 8/28/2008 

South Trail 7/24/2010 

Union 8/16/2011 

Walker 10/2/2011 

Power Station 9/27/2009 

5700 N 7/5/2012 

Hwy 45 MM103 9/1/2011 

Long Butte 8/21/2010 

Trails 8/6/2009 

Walker 10/2/2011 

Windmill 8/4/2011 

Windmills 6/16/2008 

Ditto 7/7/2012 

Power 8/16/2011 

Union 8/16/2011 

Kuna Butte 7/17/2011 

Ditto 7/7/2012 

South Pen 8/16/2011 

Union 8/16/2011 

Alternative 8B – Compare to Alternative 8C 6.5 Ditto 7/7/2012 

Ditto 7/7/2012 

Reggie 7/6/2011 

Proposed – Compare to Alternative 8D 6.9Alternative 8D 8.1Proposed – Compare to Alternative 8E 7.0

Con Shea 6/14/2012 

Swan 5/28/2012 

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7BNotes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero miles or null value

1/ "t" indicates only a trace amount (<0.1 acre) of impact

Table D.6-7. Wildland Fires Within the Analysis Area cont.

Segment Number Proposed or Alternative Name

Segment Length 

(Miles) Name of Fire Date of Fire 

Proposed – Compare to Alternative 8B 45.3Alternative 8B 45.8Alternative 8C 6.4Proposed – Total Length 131.5Proposed – Compare to Alternative 8A 51.9Alternative 8A 53.6 8

Alternative 8E 18.3

Table D.6-7 Page 3 of 5

Gateway West Transmission Line Final EIS
MM40 HWY78 9/27/2009 

Balanced Road 6/3/2012 

Berger 8/9/2012 

Cottonwood Creek 6/21/2012 

East Hollister 8/5/2012 

Flint 7/31/2010 

Hot Spings 2 10/1/2011 

Kinyon Road 7/7/2012 

Long Butte 8/21/2010 

Love 7/30/2011 

MM43 HWY78 7/9/2012 

South Indian 7/9/2012 

Proposed – Compare to Alternative 9A 7.8Alternative 9A 7.7

Balanced Road 6/3/2012 

Flint 7/31/2010 

Kinyon Road 7/7/2012 

Long Butte 8/21/2010 

Kinyon Road 7/7/2012 

Long Butte 8/21/2010 

Windmill 8/4/2011 

Balanced Road 6/3/2012 

Kinyon Road 7/7/2012 

Long Butte 8/21/2010 

Balanced Road 6/3/2012 

Kinyon Road 7/7/2012 

Long Butte 8/21/2010 

MM40 HWY78 9/27/2009 

Hot Spings 2 10/1/2011 

Love 7/30/2011 

MM43 HWY78 7/9/2012 

South Indian 7/9/2012 

Wilkins Gulch 10/4/2011 

Chattin Flat 5/14/2012 

Con Shea 6/14/2012 

Hot Springs 2 10/1/2011 

Jack Creek 8/10/2010 

South Indian 7/9/2012 

Strike 7/19/2012 

Chattin Flat 5/14/2012 

Con Shea 6/14/2012 

Hot Springs 2 10/1/2011 

Jack Creek 8/10/2010 

Love 7/30/2011 

South Indian 7/9/2012 

Strike 7/19/2012 

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7BNotes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero miles or null value

162.2

Alternative 9F 63.3Alternative 9C 14.4Proposed – Compare to Alternative 9D,F,G,H 57.2Alternative 9D 60.1Proposed – Compare to Alternative 9B 49.1Alternative 9B 52.3Proposed – Compare to Alternative 9C 14.4Proposed – Total Length

Table D.6-7. Wildland Fires Within the Analysis Area cont.

9

Segment Length 

(Miles) Name of Fire Date of Fire 

Segment Number Proposed or Alternative Name 

Table D.6-7 Page 4 of 5

Gateway West Transmission Line Final EIS
Wilkins Gulch 10/4/2011 

Chattin Flat 5/14/2012 

Con Shea 6/14/2012 

Hot Springs 2 10/1/2011 

Jack Creek 8/10/2010 

South Indian 7/9/2012 

Strike 7/19/2012 

Chattin Flat 5/14/2012 

Con Shea 6/14/2012 

Hot Springs 2 10/1/2011 

Jack Creek 8/10/2010 

South Indian 7/9/2012 

Strike 7/19/2012 

MM40 HWY78 9/27/2009 

Hot Spings 2 10/1/2011 

Love 7/30/2011 

MM43 HWY78 7/9/2012 

South Indian 7/9/2012 

Crowbar 8/7/2010 

Hot Springs 2 10/1/2011 

Love 7/30/2011 

Sailor Creek 6/29/2010 

South Indian 7/9/2012 

10 Proposed – Total Length 34.4 Hunt 7/2/2008 

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7BNotes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero miles or null value

Alternative 9G 57.8Proposed – Comparison portion for Alternative 9E (revised) 61.4

Table D.6-7. Wildland Fires Within the Analysis Area cont.

9

(cont.)

Alternative 9E (revised) 70.6Alternative 9H 61.0

Segment Number Proposed or Alternative Name

Segment Length 

(Miles) Name of Fire Date of Fire 

Table D.6-7 Page 5 of 5

Gateway West Transmission Line Final EIS
Table D.8-1. Invasive and Noxious Plant Species Potentially Present in the Gateway West Project Analysis Area

State of Wyoming 

(Designated) Wyoming Counties (Dec

Black henbane Hyoscyamus niger 1/ Yes -- Albany, Converse, Lincoln, N

Sweetwater 

Buffalobur Solanum rostratum Yes -- Converse, Natrona Canada thistle Cirsium arvense 1/ Yes X -- Common burdock Arctium minus 1/ Yes X -- 

Common crupina Crupina vulgaris 1/ Yes -- Converse 

Common St. Johnswort Hypericum perforatum 1/ Yes X -- Common Tansy Tanacetum vulgare 1/ Yes X -- Dalmatian toadflax Linaria dalmatica 1/ Yes X -- 

Diffuse knapweed Centaurea diffusa 1/ Yes X -- Dyer’s woad Isatis tinctoria 1/ Yes X -- Eurasian watermilfoil Myriophyllum spicatum 1/ Yes -- -- Field bindweed Convolvulus arvensis 1/ Yes X -- Giant Knotweed Polygonum sachalinense -- -- Hairy whitetop, Hoary cress Cardaria pubescens 1/ Yes X 7/ -- 

Hoary alyssum Berteroa incana Yes 

Houndstongue Cynoglossum officinale 1/ Yes X -- Iberian starthistle Centaurea iberica 1/ Yes -- Converse 

Japanese Knotweed Polygonum cuspidatum Yes -- -- Johnsongrass Sorghum halepense Yes -- -- 

Jointed goatgrass Aegilops cylindrica 1/ Yes -- Converse Leafy spurge Euphorbia esula 1/ Yes X -- Matgrass Nardus stricta 1/ Yes -- -- Mayweed chamomile Anthemis cotula 1/ Yes -- -- 

Milium Milium vernale Yes -- -- 

Musk thistle Carduus nutans 1/ Yes X -- Orange hawkweed Hieracium aurantiacum 1/ Yes -- Converse Oxeye daisy Leucanthemum vulgare ( formerly Chrysanthemum leucanthemum) 1/ Yes X -- Parrotfeather Milfoil Myriophyllum aquaticum Yes -- -- Perennial pepperweed, tall whitetop Lepidium latifolium 1/ Yes X -- Perennial sowthistle Sonchus arvensis 1/ Yes X -- Plumeless thistle Carduus acanthoides 1/ Yes X -- 

Poison hemlock Conium maculatum 1/ Yes -- -- 

Puncture vine Tribulus terrestris Yes -- Natrona Purple loosestrife Lythrum salicaria 1/ Yes X -- Quackgrass Agropyron repens 1/ Yes X -- 

Rush skeletonweed Chondrilla juncea 1/ Yes -- Converse 

1/ Species on the BLM national invasive species list.2/ Included in Invaders database (University of Montana-Missoula 2009).3/ Designated noxious weeds are plants that are legally designated by a federal, state, or county government as injurious to public health, agriculture, recreation, wildlife, or property; wher

 that have been declared on a county-by-county basis. 

4/ Source for status: ISDA 2008; Wyoming Weed and Pest 2012a and b; NDA 2009. “—” indictates not listed. 5/ Distribution based on Invaders database (University of Montana-Missoula 2009), Plants database (NRCS 2009), and ISDA (2008). 6/ Idaho listing categories are explained in text.7/ Hairy whitetop (Cardaria pubescens) and whitetop (Cardaria draba) are listed as the same species as designated as one noxious weed by the state of Wyoming.

 Distribution of native species is only shown for Wyoming counties where listed as noxious. Underlined segments indicate that species is likely to occur where regulated, non-underlined  not regulated.

Listed as Noxious 

3

Species on State Noxious Weed ListCommon Name Scientific Name Invasive Exotic Species2/

Table D.8-1 Page 1 of 3

Gateway West Transmission Line Final EIS
Table D.8-1. Invasive and Noxious Plant Species Potentially Present in the Gateway West Project Analysis Area cont. 

State of Wyoming 

(Designated) Wyoming Counties (Dec

Russian knapweed Acroptilon repens 1/ Yes X -- 

Russian olive Elaeagnus angustifolia 1/ Yes X -- 

Salt cedar, tamarisk Tamarix spp. 1/ Yes X -- 

Scotch broom Cytisus scoparius 1/ Yes -- Converse Scotch thistle Onopordum acanthium 1/ Yes X -- Silverleaf nightshade Solanum elaeagnifolium Yes -- -- Skeletonleaf bursage Ambrosia tomentosa Yes X -- Spotted knapweed Centaurea maculosa 1/ Yes X -- Syrian beancaper Zygophyllum fabago 1/ Yes -- Converse Tansy ragwort Senecio jacobaea 1/ Yes -- Converse Vipers blugloss Echium vulgare 1/ Yes -- -- White Bryony Bryonia alba Yes Whitetop, hoary cress Cardaria draba 1/ Yes X 7/ -- Yellow hawkweed Hieracium caespitosum, H. pratense 1/ Yes -- Converse Yellow starthistle Centaurea solstitialis 1/ Yes -- -- Yellow toadflax Linaria vulgaris 1/ Yes X -- Absinth wormwood Artemisia absinthium Yes -- Converse 

Austrian peaweed/ Swainsonpea Sphaerophysa salsula 1/ Yes -- -- 

Baby’s breath Gypsophila paniculata 1/ Yes -- Converse 

Bermuda grass Cynodon dactylon 1/ Yes -- -- 

Black medic Medicago lupulina Yes -- Natrona 

Bull thistle Cirsium vulgare 1/ Yes -- Converse, Lincoln 

Bur buttercup Ranunculus testiculatus Yes -- Converse Camelthorn Alhagi camelorum 1/ Yes -- -- 

Carolina horse-nettle Solanum carolinense Yes -- -- 

Cheatgrass/downy brome Bromus tectorum 1/ Yes -- Albany, Converse, Natro

Chicory Cichorium intybus 1/ Yes -- Converse Common cocklebur Xanthium strumarium Yes -- Converse Common mullein Verbascum thapsus Yes -- Converse Common sunflower Helianthus annuus Native -- Converse 

Curly dock Rumex crispus Yes -- Converse, Natrona 

Curlycup gumweed Grindelia squarrosa Native -- Converse, Natrona 

Dames rocket Hersperis matronalis 1/ Yes Converse 

Foxtail barley Hordium jubatum Native -- Sweetwater 

Geyer larkspur Delphinium geyeri Native -- Albany, Carbon 

1/ Species on the BLM national invasive species list.2/ Included in Invaders database (University of Montana-Missoula 2009).3/ Designated noxious weeds are plants that are legally designated by a federal, state, or county government as injurious to public health, agriculture, recreation, wildlife, or property; wher

 that have been declared on a county-by-county basis. 

4/ Source for status: ISDA 2008; Wyoming Weed and Pest 2012a and b; NDA 2009. “—” indictates not listed. 5/ Distribution based on Invaders database (University of Montana-Missoula 2009), Plants database (NRCS 2009), and ISDA (2008). 6/ Idaho listing categories are explained in text.7/ Hairy whitetop (Cardaria pubescens) and whitetop (Cardaria draba) are listed as the same species as designated as one noxious weed by the state of Wyoming.

 Distribution of native species is only shown for Wyoming counties where listed as noxious. Underlined segments indicate that species is likely to occur where regulated, non-underlined  not regulated.

Invasive Exotic 

Species2/

County Declared or other Species Not on State Weed Lists, or Not Likely to Occur Where Regulated by State

Listed as Noxious3

Common Name Scientific NameSpecies on State Noxious Weed List cont.

Table D.8-1 Page 2 of 3

Gateway West Transmission Line Final EIS
Table D.8-1. Invasive and Noxious Plant Species Potentially Present in the Gateway West Project Analysis Area cont. 

State of Wyoming 

(Designated) Wyoming Counties (Dec

Goatsrue Galega officinalis Yes -- Converse 

Gorse Ulex europaeus Yes -- Converse 

Halogeton Halogeton glomeratus 1/ Yes -- Carbon, Converse, Natro

Italian thistle Carduus pycnocephalus 1/ Yes -- Converse 

Japanese brome Bromus japonicus 1/ Yes -- -- 

Lady’s bedstraw Galium verum Yes -- Sweetwater 

Locoweed Oxytropis spp. Native -- Albany 

Meadow knapweed Centaurea nigrescens 1/ Yes -- Converse 

Medusahead Taeniatherum caput-medusae Yes -- Converse 

Mountain thermopsis Thermopsis montana Native -- Sweetwater 

Musk mustard, blue mustard Chorispora tenella Yes -- Converse 

Plains pricklypear Opuntia polyacantha Native -- Carbon 

Purple starthistle Centaurea calcitrapa Yes -- Converse 

Redstem filaree Erodium cicutarium Yes -- Converse 

Russian thistle Salsola iberica Yes -- -- 

Sandbur Cenchrus incertus Yes -- Converse 

Scentless chamomile Tripleurospermum inodorum 1/ Yes -- Converse 

Showy milkweed Asclepias speciosa Native -- Converse, Natrona 

Squarrose knapweed Centaurea virgata Yes -- Converse Sulfur cinquefoil Potentilla recta 1/ Yes -- Converse 

Teasel Dipsacus fullonum 1/ Yes -- Converse 

Wavyleaf thistle Cirsium undulatum Native -- Converse 

Western sticktight Lappula occidentalis Native -- Converse Wild licorice Glycyrrhiza lepidota Native -- Converse, Natrona Wild oats Avena fatua Yes -- Lincoln 

Wyeth’s lupine Lupinus wyethii Native -- Carbon, Converse 

1/ Species on the BLM national invasive species list.2/ Included in Invaders database (University of Montana-Missoula 2009).3/ Designated noxious weeds are plants that are legally designated by a federal, state, or county government as injurious to public health, agriculture, recreation, wildlife, or property; wher

 that have been declared on a county-by-county basis. 

4/ Source for status: ISDA 2008; Wyoming Weed and Pest 2012a and b; NDA 2009. “—” indictates not listed. 5/ Distribution based on Invaders database (University of Montana-Missoula 2009), Plants database (NRCS 2009), and ISDA (2008). 6/ Idaho listing categories are explained in text.7/ Hairy whitetop (Cardaria pubescens) and whitetop (Cardaria draba) are listed as the same species as designated as one noxious weed by the state of Wyoming.

Common Name Scientific Name Distribution of native species is only shown for Wyoming counties where listed as noxious. Underlined segments indicate that species is likely to occur where regulated, non-underlined  not regulated.County Declared or other Species Not on State Weed Lists, or Not Likely to Occur Where Regulated by State cont.

Invasive Exotic 

Species2/

Listed as Noxious3

Table D.8-1 Page 3 of 3

Gateway West Transmission Line Final EIS
Table D.9-1. Impacts to Wetlands and Riparian Areas during Construction (acres)

Herbaceous 

Wetlands

Shrub 

Wetlands

Mixed 

Wetlands

Herbaceous 

Riparian

R

Construction 

Facilities

Construction 

Facilities

Construction 

Facilities

ROW Clearing1/

Total Construction 

Impacts

Construction 

Facilities

Construction 

Facilities

ROW Clearing1/

Total Construction 

Impacts

Construction 

Facilities

1W(a) Proposed – Total Length 73.8 2.4 1.3 0.3 1.6 1.9 t2/ 4.0 1.6 5.6 0.9 

Proposed – Comparison portion for Alternative 1W(a)-B 16.5 0.2 0.3 1.6 1.9 0.6 1.6 2.2 0.1 

Alternative 1W(a)-B 20.9 0.1 0.1 0.1 0.1 

1W(c) Proposed – Total Length 73.6 1.6 0.1 0.7 1.7 2.4 1.4 3.9 1.7 5.6 1.7 

Proposed – Total Length 91.9 2.9 1.2 4.1 4.1 0.2 

Proposed – Comparison portion for Alternative 2A 16.8 2.9 0.7 3.6 3.6 

Alternative 2A 16.0 1.8 6.0 7.9 7.9 1.5 

Proposed – Comparison portion for Alternative 2B 12.5 2.9 0.7 3.6 3.6 

Alternative 2B 12.2 6.9 6.1 13.0 13.0 

Segment 3 Proposed – Total Length 45.9 1.2 0.4 t2/ 1.6 1.6 t2/ 

Segment 3A Proposed – Total Length 5.1 0.7 0.7 0.7 Proposed – Total Length 197.6 53.93/ 12.1 0.6 1.7 2.3 2.2 68.83/ 1.7 70.43/ 20.8 

Proposed – Comparison Portion for Alternatives 4B-4F 85.2 35.3 7.6 0.4 t2/ 0.5 0.9 44.3 t2/ 44.3 18.3 

Alternative 4B 100.2 24.2 1.1 0.3 0.3 2.1 27.8 27.8 16.2 

Alternative 4C 101.6 23.2 1.8 0.3 0.3 0.3 25.6 25.6 15.4 

Alternative 4D 100.8 24.5 1.2 0.3 0.3 2.4 28.4 28.4 16.1 

Alternative 4E 102.2 23.4 1.9 0.3 0.3 0.6 26.3 26.3 15.4 

Alternative 4F 87.5 29.5 1.4 0.5 0.7 1.2 1.1 32.4 0.7 33.1 17.6 

Proposed – Total Length 55.7 1.1 0.1 1.1 1.1 0.7 

Proposed – Comparison portion for Alternatives 5A,B 22.3 0.1 0.1 0.2 0.2 t2/ 

Alternative 5A 29.7 0.1 0.1 0.1 0.1 

Alternative 5B 40.4 t2/ 0.1 0.1 0.1 0.2 

Proposed – Comparison portion for Alternative 5C 32.9 0.1 0.1 0.2 0.2 0.7 

Alternative 5C 26.0 2.9 0.7 3.6 3.6 0.4 Proposed – Comparison portion for Alternative 5D 19.2 0.7 Alternative 5D 17.0 0.7 Proposed – Comparison portion for Alternative 5E 5.8 Alternative 5E 5.3 

6 Proposed – Total Length 0.5

Notes: Due to permit criteria, acreages reported here are rounded to tenths of an acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero acres or null valueNotes: This table is based on Project-specific vegetation/wetland data, and the values reported herein may differ from the values reported specifically for National Forests within this EIS, since National Forest System 

1/ ROW Clearing limited to tall vegetation that may impact transmission line safety2/ "t" indicates only a trace amount (<0.1 acre) of impact3/ This number was manually changed from the GIS analysis. It was reduced by 17.2 acres based on matting techniques as described in Section 3.9.2.2. 4/ Alternative 4G was added in late 2012 and was therefore not added to this table

1W

32

44/

Segment 

Number Proposed or Alternative Name

Segment 

Length 

(miles)

Forested Wetlands

5

Total Wetlands 

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), Proposed 

Table D.9-1 Page 1 of 2

Gateway West Transmission Line Final EIS
Table D.9-1. Impacts to Wetlands and Riparian Areas during Construction (acres) cont.

Herbaceous 

Wetlands

Shrub 

Wetlands

Mixed 

Wetlands

Herbaceous 

Riparian

R

Construction 

Facilities

Construction 

Facilities

Construction 

Facilities

ROW Clearing1/

Total Construction 

Impacts

Construction 

Facilities

Construction 

Facilities

ROW Clearing1/

Total Construction 

Impacts

Construction 

Facilities

Proposed – Total Length 118.2 1.9 0.7 0.1 2.7 2.7 2.5 

Proposed – Comparison portion for Alternatives 7A,B 35.1 0.1 0.1 0.2 0.2 0.3 Alternative 7A 37.7 0.2 0.4 5.7 6.3 6.3 0.3 

Alternative 7B 46.2 0.1 

Proposed – Comparison portion for Alternative 7C 20.1 0.1 t2/ 0.1 0.1 t2/ 

Alternative 7C 20.3Proposed – Comparison portion for Alternative 7D 6.2 1.4 1.4 1.4 2.1 

Alternative 7D 6.8 1.4 1.4 1.4 2.2 

Proposed – Comparison portion for Alternative 7E 3.8Alternative 7E 4.5Proposed – Comparison portion for Alternative 7F 10.5 0.4 0.4 0.4 0.1 

Alternative 7F 10.8 0.1 

Proposed – Comparison portion for Alternative 7G 3.3 0.1 0.1 0.1Alternative 7G 3.4 0.1 0.1 0.1 

Proposed – Comparison portion for Alternative 7K 118.2 1.9 0.7 0.1 2.7 2.7 2.5 

Alternative 7K 148.1 2.9 1.9 t2/ t2/ 1.3 6.1 6.1 0.7 

Proposed – Total Length 131.5 7.2 0.1 7.3 7.3 0.8 

Proposed – Comparison portion for Alternative 8A 51.9 1.6 t2/ 1.6 1.6 0.1 

Alternative 8A 53.6 0.2 0.4 0.1 0.7 0.7 t2/ 

Proposed – Comparison portion for Alternative 8B 45.3 0.6 

Alternative 8B 45.8 4.4 1.9 6.3 6.3 1.1 

Proposed – Comparison portion for Alternative 8C 6.5 0.1 

Alternative 8C 6.4 

Proposed – Comparison portion for Alternative 8D 6.9 t2/ 

Alternative 8D 8.1 t2/ Proposed – Comparison portion for Alternative 8E 7.0Alternative 8E 18.3 0.2 Proposed – Total Length 162.2 1.1 0.4 0.2 1.7 1.7 0.4 

Proposed – Comparison portion for Alternative 9A 7.8 0.3 t2/ 

Alternative 9A 7.7 0.3 

Proposed – Comparison portion for Alternative 9B 49.1 0.3 

Alternative 9B 52.3 t2/ t2/ t2/ 

Proposed – Comparison portion for Alternative 9C 14.4 0.3 

Alternative 9C 14.4Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 0.8 0.4 0.2 1.4 1.4 t2/ 

Alternative 9D 60.1 0.3 0.4 0.7 0.7 0.3 

Alternative 9F 63.3 0.6 0.9 0.2 1.6 1.6 0.3 Alternative 9G 57.8 1.0 0.4 1.4 1.4 0.1 Alternative 9H 61.0 1.3 0.9 0.2 2.3 2.3 0.2 Proposed – Comparison portion for Alternative 9E (revised) 61.4 0.8 0.4 0.2 1.4 1.4 t2/ 

Alternative 9E (revised) 70.6 0.2 0.8 1.0 1.0 t2/ 

10 Proposed – Total Length 34.4 

Total of Proposed Segments (grey shading) 71.6 16.2 0.9 3.3 4.2 3.1 92.0 3.3 95.2 26.2 

Notes: Due to permit criteria, acreages reported here are rounded to tenths of an acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero acres or null valueNotes: This table is based on Project-specific vegetation/wetland data, and the values reported herein may differ from the values reported specifically for National Forests within this EIS, since National Forest System 

1/ ROW Clearing limited to tall vegetation that may impact transmission line safety2/ "t" indicates only a trace amount (<0.1 acre) of impact

3/ This number was manually changed from the GIS analysis. It was reduced by 17.2 acres based on matting techniques as described in Section 3.9.2.2. 

9

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), Proposed 

78

Segment 

Number Proposed or Alternative Name

Segment 

Length 

(miles)

Forested Wetlands Total Wetlands

Table D.9-1 Page 2 of 2

Gateway West Transmission Line Final EIS
Herbaceous 

Wetlands

Shrub 

Wetlands

Mixed 

Wetlands

Herbaceous 

Riparian

Operations Facilities

Operations Facilities

Operations Facilities

ROW Maintenance1/

Total Operation Impacts 

Operations Facilities

Operations Facilities

ROW Maintenance1/

Total Operation Impacts 

Operations Facilities

1W(a) Proposed – Total Length 73.8 0.3 0.2 0.1 1.8 1.9 t2/ 0.6 1.8 2.4 0.4 

Proposed – Comparison portion for Alternative 1W(a)-B 16.5 0.1 0.1 1.8 1.9 0.1 1.8 2.0 t2/ 

Alternative 1W(a)-B 20.9 t2/ t2/ t2/ t2/ 

1W(c) Proposed – Total Length 73.6 0.2 0.1 2.2 2.3 0.2 0.5 2.2 2.7 0.3 

Proposed – Total Length 91.9 0.2 0.1 0.2 0.2 t2/ 

Proposed – Comparison portion for Alternative 2A 16.8 0.1 t2/ 0.2 0.2 

Alternative 2A 16.0 0.2 t2/ 0.2 0.2 0.1 

Proposed – Comparison portion for Alternative 2B 12.5 0.1 t2/ 0.2 0.2 

Alternative 2B 12.2 0.1 0.1 0.1 

Segment 3 Proposed – Total Length 45.9 0.2 t2/ t2/ 0.2 0.2 t2/ 

Segment 3A Proposed – Total Length 5.1 

Proposed – Total Length 197.6 0.03/ 0.6 t2/ 1.7 1.8 0.2 0.83/ 1.7 2.53/ 1.1 

Proposed – Comparison portion for Alternatives 4B-4F 85.2 2.3 0.4 t2/ 0.1 0.1 0.1 2.7 0.1 2.8 0.5 

Alternative 4B 100.2 1.1 0.1 t2/ t2/ 0.3 1.5 1.5 0.3 

Alternative 4C 101.6 0.8 0.2 t2/ t2/ 0.1 1.2 1.2 0.3 Alternative 4D 100.8 1.2 0.1 t2/ t2/ 0.4 1.7 1.7 0.3 Alternative 4E 102.2 0.9 0.3 t2/ t2/ 0.2 1.4 1.4 0.3 Alternative 4F 87.5 1.4 0.2 0.1 0.7 0.8 0.1 1.6 0.7 2.4 0.3 

Proposed – Total Length 55.7 0.1 t2/ 0.1 0.1 0.2 

Proposed – Comparison portion for Alternatives 5A,B 22.3 t2/ t2/ t2/ t2/ t2/ 

Alternative 5A 29.7 t2/ t2/ t2/ t2/ 

Alternative 5B 40.4 t2/ t2/ t2/ t2/ 

Proposed – Comparison portion for Alternative 5C 32.9 t2/ t2/ t2/ t2/ 0.2 

Alternative 5C 26.0 t2/ t2/ t2/ t2/ 

Proposed – Comparison portion for Alternative 5D 19.2 0.2 

Alternative 5D 17.0 t2/ 

Proposed – Comparison portion for Alternative 5E 5.8 

Alternative 5E 5.3 

6 Proposed – Total Length 0.5

Notes: Due to permit criteria, acreages reported here are rounded to tenths of an acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero acres or null valueNotes: This table is based on Project-specific vegetation/wetland data, and the values reported herein may differ from the values reported specifically for National Forests within this EIS, since National Forest Syst

1/ ROW maintenance limited to tall vegetation that may impact transmission line safety2/ "t" indicates only a trace amount (<0.1 acre) of impact3/ This number was manually changed from the GIS analysis. It was reduced by 5.3 acres based on matting techniques as described in Section 3.9.2.2. 4/ Alternative 4G was added in late 2012 and was therefore not added to this table

5

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), Propos

1W

2

44/

3

Table D.9-2. Impacts to Wetlands and Riparian Areas during Operations (acres)

Segment 

Number Proposed or Alternative Name

Segment 

Length 

(miles)

Forested Wetlands Total Wetlands

Table D.9-2 Page 1 of 2

Gateway West Transmission Line Final EIS
Herbaceous 

Wetlands

Shrub 

Wetlands

Mixed 

Wetlands

Herbaceous 

Riparian

Operations Facilities

Operations Facilities

Operations Facilities

ROW Maintenance1/

Total Operation Impacts 

Operations Facilities

Operations Facilities

ROW Maintenance1/

Total Operation Impacts 

Operations Facilities

Proposed – Total Length 118.2 0.1 0.1 t2/ 0.2 0.2 0.1 

Proposed – Comparison portion for Alternatives 7A,B 35.1 t2/ t2/ 0.1 0.1 t2/ Alternative 7A 37.7 t2/ t2/ 0.3 0.3 0.3 t2/ Alternative 7B 46.2 t2/ Proposed – Comparison portion for Alternative 7C 20.1 t2/ t2/ t2/ t2/ 

Alternative 7C 20.3Proposed – Comparison portion for Alternative 7D 6.2 t2/ t2/ t2/ t2/ 

Alternative 7D 6.8 t2/ t2/ t2/ t2/ Proposed – Comparison portion for Alternative 7E 3.8Alternative 7E 4.5Proposed – Comparison portion for Alternative 7F 10.5 t2/ t2/ t2/ t2/ 

Alternative 7F 10.8 t2/ 

Proposed – Comparison portion for Alternative 7G 3.3 t2/ t2/ t2/ Alternative 7G 3.4 t2/ t2/ t2/ Proposed – Comparison portion for Alternative 7K 118.2 0.1 0.1 t2/ 0.2 0.2 0.1 

Alternative 7K 148.1 0.1 0.1 0.3 0.5 0.5 0.1 

Proposed – Total Length 131.5 0.3 t2/ 0.3 0.3 0.2 

Proposed – Comparison portion for Alternative 8A 51.9 0.1 0.1 0.1 t2/ 

Alternative 8A 53.6 0.1 0.1 t2/ 0.2 0.2 t2/ 

Proposed – Comparison portion for Alternative 8B 45.3 0.0 0.2 

Alternative 8B 45.8 0.1 0.1 0.1 0.1 Proposed – Comparison portion for Alternative 8C 6.5 

Alternative 8C 6.4 Proposed – Comparison portion for Alternative 8D 6.9Alternative 8D 8.1Proposed – Comparison portion for Alternative 8E 7.0Alternative 8E 18.3Proposed – Total Length 162.2 0.1 0.1 t2/ 0.3 0.3 t2/ 

Proposed – Comparison portion for Alternative 9A 7.8 t2/ 

Alternative 9A 7.7 t2/ Proposed – Comparison portion for Alternative 9B 49.1 t2/ Alternative 9B 52.3 

Proposed – Comparison portion for Alternative 9C 14.4 t2/ 

Alternative 9C 14.4Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 0.1 0.1 t2/ 0.3 0.3 t2/ 

Alternative 9D 60.1 t2/ t2/ t2/ 

Alternative 9F 63.3 0.1 0.1 t2/ 0.3 0.3 

Alternative 9G 57.8 0.2 0.2 0.2 

Alternative 9H 61.0 0.3 0.1 t2/ 0.5 0.5 

Proposed – Comparison portion for Alternative 9E (revised) 61.4 0.1 0.1 t2/ 0.2 0.2 t2/ 

Alternative 9E (revised) 70.6 0.1 t2/ 0.1 0.1 t2/ 

10 Proposed – Total Length 34.4 

Total of Proposed Segments (grey shading) 1.2 1.0 0.1 3.6 3.7 0.2 3.2 5.7 8.9 2.0 

Notes: Due to permit criteria, acreages reported here are rounded to tenths of an acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero acres or null valueNotes: This table is based on Project-specific vegetation/wetland data, and the values reported herein may differ from the values reported specifically for National Forests within this EIS, since National Forest Syst

1/ ROW maintenance limited to tall vegetation that may impact transmission line safety2/ "t" indicates only a trace amount (<0.1 acre) of impact

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), Propos

Total Wetlands 

789

Table D.9-2. Impacts to Wetlands and Riparian Areas during Operations (acres) cont. 

Segment 

Number Proposed or Alternative Name

Segment 

Length 

(miles)

Forested Wetlands

Table D.9-2 Page 2 of 2

Gateway West Transmission Line Final EIS
Table D.10-1. Miles of Big Game Crossed by the Proposed and Alternative Routes 

1W(a) Proposed – Total Length 73.8 5.4 

Proposed – Comparison portion for Alternative 1W(a)-B 16.5 

Alternative 1W(a)-B 20.9 

1W(c) Proposed – Total Length 73.6 5.4 

Proposed – Total Length 91.9 2.4 

Proposed – Compare to Alternative 2A 16.8 2.4 

Alternative 2A 16.0 

Proposed – Compare to Alternative 2B 12.5 2.4 

Alternative 2B 12.2 

Segment 3 Proposed – Total Length 45.9 

Segment 3A Proposed – Total Length 5.1 

Proposed – Total Length 197.6 8.22/ 33.8 22.1 

Proposed – Compare to Alternatives 4B-4F 85.2 8.2 17.6 22.1 

Alternative 4B 100.2 34.2 4.1 

Alternative 4C 101.6 35.7 16.4 

Alternative 4D 100.8 33.7 4.1 

Alternative 4E 102.2 35.2 16.4 

Alternative 4F 87.5 8.2 12.6 21.5 

Proposed – Total Length 55.7 

Proposed – Compare to Alternatives 5A,B 22.3 Alternative 5A 29.7 

Alternative 5B 40.4 

Proposed – Compare to Alternative 5C 32.9 Alternative 5C 26.0 8.6 

Proposed – Compare to Alternative 5D 19.2 Alternative 5D 17.0 

Proposed – Compare to Alternative 5E 5.8 Alternative 5E 5.3 

6 Proposed – Total Length 0.5 

Notes: Proposed 9 (including 9E), and Proposed 10Notes: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero miles or null value

1/ Data have been received only for Wyoming portions of the route. Blank cells do not indicate that no parturition range will be crossed

2/ These numbers only represent the Wyoming portion of Segment 43/ Alternative 4G was added in late 2012 and was therefore not added to this table

Elk 

Winter Range

Segment Length 

Proposed or Alternative Name (Miles)

Segment 

Number

3

W

Moose 

Winter Range

Bighorn Sheep 

Winter Range

Elk Calving 

Areas1/ 

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B

1W

52

43/

Table D.10-1 Page 1 of 2

Gateway West Transmission Line Final EIS
Table D.10-1. Miles of Big Game Crossed by the Proposed and Alternative Routes cont. 

Proposed – Total Length 118.2 Proposed – Compare to Alternatives 7A,B 35.1 Alternative 7A 37.7 Alternative 7B 46.2 Proposed – Compare to Alternative 7C 20.1 Alternative 7C 20.3 Proposed – Compare to Alternative 7D 6.2 Alternative 7D 6.8 Proposed – Compare to Alternative 7E 3.8 Alternative 7E 4.5 Proposed – Compare to Alternative 7F 10.5 Alternative 7F 10.8 Proposed – Compare to Alternative 7G 3.3 Alternative 7G 3.4 Proposed – Comparison portion for Alternative 7K 118.2 Alternative 7K 148.1 Proposed – Total Length 131.5 17.5 

Proposed – Compare to Alternative 8A 51.9 1.9 

Alternative 8A 53.6 

Proposed – Compare to Alternative 8B 45.3 4.1

Alternative 8B 45.8 4.1

Alternative 8B – Compare to Alternative 8C 6.5 4.1

Alternative 8C 6.4 5.6

Proposed – Compare to Alternative 8D 6.9Alternative 8D 8.1Proposed – Comparison portion for Alternative 8E 7.0Alternative 8E 18.3 1.4Proposed – Total Length 162.2 

Proposed – Compare to Alternative 9A 7.8 Alternative 9A 7.7 

Proposed – Compare to Alternative 9B 49.1Alternative 9B 52.3Proposed – Compare to Alternative 9C 14.4Alternative 9C 14.4Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 Alternative 9D 60.1 1.4 

Alternative 9F 63.3 1.4 Alternative 9G 57.8 1.7 Alternative 9H 61.0 1.7 Proposed – Comparison portion for Alternative 9E (revised) 61.4 17.6 Alternative 9E (revised) 70.6 4.3 25.3 

10 Proposed – Total Length 34.4 

Notes: Proposed 9 (including 9E), and Proposed 10Notes: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero miles or null value

1/ Data have been received only for Wyoming portions of the route. Blank cells do not indicate that no parturition range will be crossed

78

Segment 

Number

Bighorn Sheep 

Winter Range

Elk Calving 

Areas1/ 

Moose 

Winter Range

W

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B

Proposed or Alternative Name

Segment Length 

(Miles)

Elk 

Winter Range

9

Table D.10-1 Page 2 of 2

Gateway West Transmission Line Final EIS
American 

Kestrel

Bald 

Eagle

Burrowing 

Owl

Common 

Raven

Ferruginous 

Hawk

Golden 

Eagle

Great 

Horned Owl

Long-eared 

Owl

1W(a) Proposed – Total Length 73.8 1 1 3 14 8 

Proposed – Comparison portion for Alternative 1W(a)-B 16.5 1 3 

Alternative 1W(a)-B 20.9 2 

1W(c) Proposed – Total Length 73.6 1 1 4 14 2 1 

Proposed – Total Length 91.9 5 5 5 105 37 2 

Proposed – Comparison portion for Alternative 2A 16.8 1 19 10 1 

Alternative 2A 16.0 1 2 2 3 

Proposed – Comparison portion for Alternative 2B 12.5 19 8 1 

Alternative 2B 12.2 2 10 7 

Segment 3 Proposed – Total Length 45.9 2 2 5 17 12 1 

Segment 3A Proposed – Total Length 5.1 1 1 2 1 

Proposed – Total Length 197.6 6 3 18 16 14 7 1 

Proposed – Comparison portion for Alternatives 4B-4F 85.2 1 6 3 8 1 1 

Alternative 4B 100.2 1 1 2 6 1 Alternative 4C 101.6 1 1 2 6 1 Alternative 4D 100.8 1 1 2 6 1 Alternative 4E 102.2 1 1 2 6 1 Alternative 4F 87.5 1 5 3 7 1 1 

Proposed – Total Length 55.7 2 1 1 

Proposed – Comparison portion for Alternatives 5A,B 22.3 1 

Alternative 5A 29.7 3 Alternative 5B 40.4 2 

Proposed – Comparison portion for Alternative 5C 32.9 1 

Alternative 5C 26.0

Proposed – Comparison portion for Alternative 5D 19.2 2 1 

Alternative 5D 17.0 2 1 

Proposed – Comparison portion for Alternative 5E 5.8 2 

Alternative 5E 5.3

6 Proposed – Total Length 0.5

1/ Alternative 4G was added in late 2012 and was therefore not added to this table

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B

Raptor and Birds 

41/

1W

3

Table D.10-2. Known Raptor and Bird of Prey Nest Locations within 1 mile of Project Centerline

Segment 

Number Proposed or Alternative Name

Segment 

Length 

(Miles)

25

Table D.10-2 Page 1 of 2

Gateway West Transmission Line Final EIS
American 

Kestrel

Bald 

Eagle

Burrowing 

Owl

Common 

Raven

Ferruginous 

Hawk

Golden 

Eagle

Great 

Horned Owl

Long-eared 

Owl

Proposed – Total Length 118.2 3 9 2 

Proposed – Comparison portion for Alternatives 7A,B 35.1

Alternative 7A 37.7Alternative 7B 46.2

Proposed – Comparison portion for Alternative 7C 20.1 2 2 

Alternative 7C 20.3

Proposed – Comparison portion for Alternative 7D 6.2 1 1 

Alternative 7D 6.8 1 

Proposed – Comparison portion for Alternative 7E 3.8 7 1 

Alternative 7E 4.5 7 1 

Proposed – Comparison portion for Alternative 7F 10.5 7 1 

Alternative 7F 10.8 7 1 

Proposed – Comparison portion for Alternative 7G 3.3

Alternative 7G 3.4

Proposed – Comparison portion for Alternative 7K 118.2 3 9 2 

Alternative 7K 148.1 1 61 11 

Proposed – Total Length 131.5 43 74 20 

Proposed – Comparison portion for Alternative 8A 51.9 1 8 

Alternative 8A 53.6 20 

Proposed – Comparison portion for Alternative 8B 45.3 42 56 6 

Alternative 8B 45.8 34 20 

Proposed – Comparison portion for Alternative 8C 6.5 13 

Alternative 8C 6.4 18 

Proposed – Comparison portion for Alternative 8D 6.9 14 25 

Alternative 8D 8.1 17 27 

Proposed – Comparison portion for Alternative 8E 7.0 19 2 3 

Alternative 8E 18.3 16 23 7 

Proposed – Total Length 162.2 9 3 42 57 

Proposed – Comparison portion for Alternative 9A 7.8 2 

Alternative 9A 7.7 2 

Proposed – Comparison portion for Alternative 9B 49.1 3 9 24 

Alternative 9B 52.3 1 1 4 50 

Proposed – Comparison portion for Alternative 9C 14.4 1 9 11 

Alternative 9C 14.4 1 1 4 32 

Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 4 1 7 3 

Alternative 9D 60.1 101 39 21 Alternative 9F 63.3 96 44 15 Alternative 9G 57.8 95 34 26 Alternative 9H 61.0 90 39 20 

Proposed – Comparison portion for Alternative 9E (revised) 61.4 4 1 7 8 

Alternative 9E (revised) 70.6 3 10 11 

10 Proposed – Total Length 34.4 2 3 

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B

9

Proposed or Alternative Name

Segment 

Length 

(Miles)

Raptor and Birds 

Segment 

Number

Table D.10-2. Known Raptor and Bird of Prey Nest Locations within 1 mile of Project Centerline cont.

87

Table D.10-2 Page 2 of 2

Gateway West Transmission Line Final EIS
Average Patch 

Size (Acre) Patch Count

Average Patch 

Size (Acre) Patch Count

Average Patch 

Size (Acre) 

1W(a) Proposed – Total Length 73.8 856 61 271 379 391 Proposed – Comparison portion for Alternative 1W(a)-B 16.5 492 11 246 122 244 Alternative 1W(a)-B 20.9 891 5 194 176 262 1W(c) Proposed – Total Length 73.6 871 61 275 378 399 Proposed – Total Length 91.9 476 940 332 Proposed – Comparison portion for Alternative 2A 16.8 442 221 260 

Alternative 2A 16.0 412 228 260 

Proposed – Comparison portion for Alternative 2B 12.5 388 196 260 

Alternative 2B 12.2 376 196 260 Segment 3 Proposed – Total Length 45.9 250 4 804 324

Segment 3A Proposed – Total Length 5.1 43 2 1,106 45Proposed – Total Length 197.6 78 879 383 2,028 17 

Proposed – Comparison portion for Alternatives 4B-4F 85.2 293 43 608 658 23 

Alternative 4B 100.2 7 10 615 765 11 

Alternative 4C 101.6 7 10 613 766 10 

Alternative 4D 100.8 7 10 614 768 11 

Alternative 4E 102.2 7 10 612 769 10 

Alternative 4F 87.5 426 59 573 697 24 Proposed – Total Length 55.7 46 703 110 1,092 21 

Proposed – Comparison portion for Alternatives 5A,B 22.3 54 480 132 518 20 

Alternative 5A 29.7 52 626 125 671 23 

Alternative 5B 40.4 36 776 150 813 21 

Proposed – Comparison portion for Alternative 5C 32.9 51 594 128 652 19 

Alternative 5C 26.0 19 582 143 638 25 

Proposed – Comparison portion for Alternative 5D 19.2 63 259 106 414 17 

Alternative 5D 17.0 63 227 91 415 17 

Proposed – Comparison portion for Alternative 5E 5.8 13 73 114 166 16 

Alternative 5E 5.3 13 73 114 164 16 

6 Proposed – Total Length 0.5 47 240 78 

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero acres or null value

1/ Alternative 4G was added in late 2012 and was therefore not added to this table

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B

Table D.10-3a. Pre- and Post-Construction Levels of Fragmentation Resulting from Roads

2

Segment 

Number

Grass

1W

41/

53

Segment Forest Woodlands Shrublands

Length 

(Miles)

Pre-Construct

Proposed or Alternative Name

Table D.10-3a Page 1 of 4

Gateway West Transmission Line Final EIS
Average Patch 

Size (Acre) Patch Count

Average Patch 

Size (Acre) Patch Count

Average Patch 

Size (Acre) 

Proposed – Total Length 118.2 34 1,173 89 2,273 41 Proposed – Comparison portion for Alternatives 7A,B 35.1 42 685 128 774 22 Alternative 7A 37.7 32 915 141 827 23 Alternative 7B 46.2 20 1,013 167 899 21 Proposed – Comparison portion for Alternative 7C 20.1 14 182 53 735 72 Alternative 7C 20.3 14 196 62 570 67 Proposed – Comparison portion for Alternative 7D 6.2 25 126 56 412 42 Alternative 7D 6.8 25 126 55 420 42 Proposed – Comparison portion for Alternative 7E 3.8 21 93 136 125 18 Alternative 7E 4.5 22 97 120 149 20 Proposed – Comparison portion for Alternative 7F 10.5 28 155 113 228 22 Alternative 7F 10.8 30 165 114 246 22 Proposed – Comparison portion for Alternative 7G 3.3 20 138 254 77 14 Alternative 7G 3.4 20 134 258 75 14 Proposed – Comparison portion for Alternative 7K 118.2 34 1,173 89 2,273 41 Alternative 7K 148.1 30 2,434 147 2,896 38 Proposed – Total Length 131.5 58 5,290 36 Proposed – Comparison portion for Alternative 8A 51.9 58 1,818 45 Alternative 8A 53.6 39 2,069 47 Proposed – Comparison portion for Alternative 8B 45.3 55 2,315 33 Alternative 8B 45.8 52 1,719 39 Proposed – Comparison portion for Alternative 8C 6.5 67 482 39 Alternative 8C 6.4 64 498 40 Proposed – Comparison portion for Alternative 8D 6.9 39 819 39 Alternative 8D 8.1 38 843 42 Proposed – Comparison portion for Alternative 8E 7.0 39 709 36 Alternative 8E 18.3 41 1,207 37 Proposed – Total Length 162.2 16 96 56 6,126 40 Proposed – Comparison portion for Alternative 9A 7.8 9 13 65 308 40 Alternative 9A 7.7 9 13 68 319 41 Proposed – Comparison portion for Alternative 9B 49.1 68 1,758 50 Alternative 9B 52.3 49 2,087 42 Proposed – Comparison portion for Alternative 9C 14.4 152 396 19 Alternative 9C 14.4 150 371 14 Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 44 2,763 41 Alternative 9D 60.1 36 3,547 33 Alternative 9F 63.3 36 3,622 35 Alternative 9G 57.8 36 3,405 34 Alternative 9H 61.0 36 3,480 36 Proposed – Comparison portion for Alternative 9E (revised) 61.4 46 2,926 39 Alternative 9E (revised) 70.6 78 2,772 40 

10 Proposed – Total Length 34.4 16 65 34 844 76 

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero acres or null valueNotes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B

Proposed or Alternative Name

8

Table D.10-3a. Pre- and Post-Construction Levels of Fragmentation Resulting from Roads cont.

Segment 

Number

7

Segment 

Length 

(Miles)

Pre-Construct

Forest Woodlands Shrublands Grass

9

Table D.10-3a Page 2 of 4

Gateway West Transmission Line Final EIS
Average Patch 

Size (Acre) Patch Count

Average Patch 

Size (Acre) Patch Count

Average Patch 

Size (Acre) 

1W(a) Proposed – Total Length 73.8 842 62 260 394 372 Proposed – Comparison portion for Alternative 1W(a)-B 16.5 492 11 237 127 228 Alternative 1W(a)-B 20.9 891 5 188 181 248 1W(c) Proposed – Total Length 73.6 857 62 264 393 380 Proposed – Total Length 91.9 464 963 323 Proposed – Comparison portion for Alternative 2A 16.8 417 234 260 

Alternative 2A 16.0 390 241 260 

Proposed – Comparison portion for Alternative 2B 12.5 364 209 260 

Alternative 2B 12.2 352 209 260 Segment 3 Proposed – Total Length 45.9 250 4 782 333

Segment 3A Proposed – Total Length 5.1 43 2 1,082 46Proposed – Total Length 197.6 75 915 370 2,098 17 

Proposed – Comparison portion for Alternatives 4B-4F 85.2 273 46 583 686 23 

Alternative 4B 100.2 7 10 580 812 11 

Alternative 4C 101.6 7 10 574 818 10 

Alternative 4D 100.8 7 10 579 815 11 

Alternative 4E 102.2 7 10 573 821 10 

Alternative 4F 87.5 412 61 552 723 24 Proposed – Total Length 55.7 43 752 100 1,205 20 

Proposed – Comparison portion for Alternatives 5A,B 22.3 49 523 115 596 18 

Alternative 5A 29.7 46 705 108 778 21 

Alternative 5B 40.4 32 860 130 936 20 

Proposed – Comparison portion for Alternative 5C 32.9 48 636 114 734 18 

Alternative 5C 26.0 19 595 130 699 23 

Proposed – Comparison portion for Alternative 5D 19.2 59 279 96 458 16 

Alternative 5D 17.0 58 247 83 457 16 

Proposed – Comparison portion for Alternative 5E 5.8 13 74 103 183 15 

Alternative 5E 5.3 13 74 104 180 15 

6 Proposed – Total Length 0.5 45 249 74 

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero acres or null value

1/ Alternative 4G was added in late 2012 and was therefore not added to this table

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B

41/

5

Shrublands

2

1W

Grass

Segment/Alternative Name

Segment 

Length 

(Miles)

Forest Woodlands

Post-Construc

Segment 

Number

3

Table D.10-3a. Pre- and Post-Construction Levels of Fragmentation Resulting from Roads cont.

Table D.10-3a Page 3 of 4

Gateway West Transmission Line Final EIS
Average Patch 

Size (Acre) Patch Count

Average Patch 

Size (Acre) Patch Count

Average Patch 

Size (Acre) 

Proposed – Total Length 118.2 32 1,249 83 2,454 39 Proposed – Comparison portion for Alternatives 7A,B 35.1 39 738 113 873 21 Alternative 7A 37.7 30 991 123 944 22 Alternative 7B 46.2 19 1,076 148 1,012 20 Proposed – Comparison portion for Alternative 7C 20.1 14 187 51 767 70 Alternative 7C 20.3 14 201 59 602 65 Proposed – Comparison portion for Alternative 7D 6.2 24 129 51 449 39 Alternative 7D 6.8 24 129 50 457 39 Proposed – Comparison portion for Alternative 7E 3.8 19 103 107 159 16 Alternative 7E 4.5 20 107 98 183 17 Proposed – Comparison portion for Alternative 7F 10.5 27 165 97 264 19 Alternative 7F 10.8 28 175 100 282 20 Proposed – Comparison portion for Alternative 7G 3.3 19 143 239 82 13 Alternative 7G 3.4 20 139 242 80 13 Proposed – Comparison portion for Alternative 7K 118.2 32 1,249 83 2,454 39 Alternative 7K 148.1 29 2,562 135 3,144 36 Proposed – Total Length 131.5 56 5,530 35 Proposed – Comparison portion for Alternative 8A 51.9 55 1,892 43 Alternative 8A 53.6 37 2,176 45 Proposed – Comparison portion for Alternative 8B 45.3 52 2,443 31 Alternative 8B 45.8 50 1,787 38 Proposed – Comparison portion for Alternative 8C 6.5 62 518 37 Alternative 8C 6.4 60 534 38 Proposed – Comparison portion for Alternative 8D 6.9 38 849 37 Alternative 8D 8.1 37 875 40 Proposed – Comparison portion for Alternative 8E 7.0 37 763 33 Alternative 8E 18.3 38 1,284 34 Proposed – Total Length 162.2 16 96 53 6,461 39 Proposed – Comparison portion for Alternative 9A 7.8 9 13 62 323 39 Alternative 9A 7.7 9 13 65 334 40 Proposed – Comparison portion for Alternative 9B 49.1 64 1,858 48 Alternative 9B 52.3 46 2,222 39 Proposed – Comparison portion for Alternative 9C 14.4 142 424 18 Alternative 9C 14.4 139 401 14 Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 41 2,935 39 Alternative 9D 60.1 34 3,705 32 Alternative 9F 63.3 34 3,781 34 Alternative 9G 57.8 34 3,559 32 Alternative 9H 61.0 34 3,635 34 Proposed – Comparison portion for Alternative 9E (revised) 61.4 44 3,040 37 Alternative 9E (revised) 70.6 74 2,908 39 

10 Proposed – Total Length 34.4 16 65 33 861 73 

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero acres or null valueNotes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B

87

Table D.10-3a. Pre- and Post-Construction Levels of Fragmentation Resulting from Roads cont.

Grass

9

Segment 

Number Segment/Alternative Name

Segment 

Length 

(Miles)

Post-Construc

Forest Woodlands Shrublands

Table D.10-3a Page 4 of 4

Gateway West Transmission Line Final EIS
Reduction in 

Average Patch 

Size (Acre)

Change in 

Patch Count

Reduction in 

Average Patch 

Size (Acre)

Change in 

Patch Count

Reductio

Average 

Size (A

1W(a) Proposed – Total Length 73.8 14 1 10 15 19 

Proposed – Comparison portion for Alternative 1W(a)-B 16.5 0 0 10 5 15 

Alternative 1W(a)-B 20.9 0 0 5 5 14 

1W(c) Proposed – Total Length 73.6 14 1 10 15 20 

Proposed – Total Length 91.9 0 0 11 23 9 

Proposed – Comparison portion for Alternative 2A 16.8 0 0 25 13 0 

Alternative 2A 16.0 0 0 22 13 0 

Proposed – Comparison portion for Alternative 2B 12.5 0 0 24 13 0 

Alternative 2B 12.2 0 0 23 13 0 

Segment 3 Proposed – Total Length 45.9 0 0 22 9 0 

Segment 3A Proposed – Total Length 5.1 0 0 24 1 0 

Proposed – Total Length 197.6 3 36 13 70 0 

Proposed – Comparison portion for Alternatives 4B-4F 85.2 19 3 25 28 0 

Alternative 4B 100.2 0 0 36 47 0 

Alternative 4C 101.6 0 0 39 52 0 

Alternative 4D 100.8 0 0 35 47 0 

Alternative 4E 102.2 0 0 39 52 0 

Alternative 4F 87.5 14 2 21 26 0 

Proposed –Total Length 55.7 3 49 10 113 1 

Proposed – Comparison portion for Alternatives 5A,B 22.3 4 43 17 78 1 

Alternative 5A 29.7 6 79 17 107 2 

Alternative 5B 40.4 3 84 20 123 2 

Proposed – Comparison portion for Alternative 5C 32.9 3 42 14 82 1 

Alternative 5C 26.0 0 13 12 61 1 

Proposed – Comparison portion for Alternative 5D 19.2 5 20 10 44 1 

Alternative 5D 17.0 5 20 8 42 1 

Proposed – Comparison portion for Alternative 5E 5.8 0 1 11 17 1 

Alternative 5E 5.3 0 1 10 16 1 

6 Proposed –Total Length 0.5 0 0 2 9 4 

1/ Alternative 4G was added in late 2012 and was therefore not added to this table

Segment 

Length 

(Miles)

Segment 

Number Proposed or Alternative Name

2

41/

5

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B

1W

Forest Woodlands Shrublands 

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

Table D.10-3b. Change in Fragmentation Levels as a Result of Roads Between Pre- and Post-Construction

3

Table D.10-3b Page 1 of 2

Gateway West Transmission Line Final EIS
Reduction in 

Average Patch 

Size (Acre)

Change in 

Patch Count

Reduction in 

Average Patch 

Size (Acre)

Change in 

Patch Count

Reductio

Average 

Size (A

Proposed –Total Length 118.2 2 76 7 181 2 

Proposed – Comparison portion for Alternatives 7A,B 35.1 3 53 14 99 1 

Alternative 7A 37.7 2 76 17 117 2 

Alternative 7B 46.2 1 63 19 113 1 

Proposed – Comparison portion for Alternative 7C 20.1 0 5 2 32 2 

Alternative 7C 20.3 0 5 3 32 2 Proposed – Comparison portion for Alternative 7D 6.2 1 3 5 37 3 

Alternative 7D 6.8 1 3 4 37 3 

Proposed – Comparison portion for Alternative 7E 3.8 2 10 29 34 2 

Alternative 7E 4.5 2 10 22 34 2 

Proposed – Comparison portion for Alternative 7F 10.5 2 10 15 36 2 Alternative 7F 10.8 2 10 15 36 2 

Proposed – Comparison portion for Alternative 7G 3.3 1516 5 1 

Alternative 7G 3.4 1 5 16 5 1 

Proposed – Comparison portion for Alternative 7K 118.2 2 76 7 181 2 

Alternative 7K 148.1 2 128 12 248 2 

Proposed –Total Length 131.5 0 0 3 240 2 

Proposed – Comparison portion for Alternative 8A 51.9 0 0 2 74 2 

Alternative 8A 53.6 0 0 2 107 3 

Proposed – Comparison portion for Alternative 8B 45.3 0 0 3 128 2 

Alternative 8B 45.8 0 0 2 68 2 

Proposed – Comparison portion for Alternative 8C 6.5 0 0 5 36 2 

Alternative 8C 6.4 0 0 4 36 2 

Proposed – Comparison portion for Alternative 8D 6.9 0 0 1 30 2 

Alternative 8D 8.1 0 0 1 32 2 

Proposed – Comparison portion for Alternative 8E 7.0 0 0 3 54 3 

Alternative 8E 18.3 0 0 2 77 3 

Proposed –Total Length 162.2 0 0 3 335 2 

Proposed – Comparison portion for Alternative 9A 7.8 0 0 3 15 2 

Alternative 9A 7.7 0 0 3 15 2 

Proposed – Comparison portion for Alternative 9B 49.1 0 0 4 100 2 

Alternative 9B 52.3 0 0 3 135 2 

Proposed – Comparison portion for Alternative 9C 14.4 0 0 10 28 0 

Alternative 9C 14.4 0 0 11 30 0 Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 0 0 3 172 2 

Alternative 9D 60.1 0 0 2 158 1 

Alternative 9F 63.3 0 0 2 159 2 

Alternative 9G 57.8 0 0 2 154 2 

Alternative 9H 61.0 0 0 2 155 2 

Proposed – Comparison portion for Alternative 9E (revised) 61.4 0 0 2 114 2 

Alternative 9E (revised) 70.6 0 0 4 136 2 

10 Proposed –Total Length 34.4 0 0 1 17 3 

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

978

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B

Table D.10-3b. Change in Fragmentation Levels as a Result of Roads Between Pre- and Post-Construction cont.

Segment 

Number Proposed or Alternative Name

Segment 

Length 

(Miles)

Forest Woodlands Shrublands 

Table D.10-3b Page 2 of 2

Gateway West Transmission Line Final EIS
Table D.10-4a. Pre- and Post-Construction Levels of Fragmentation Resulting from Transmission Lines

Average Patch 

Size (Acre) Patch Count

Average Patch 

Size (Acre) Patch Count

Average Pat

Size (Acre

1W(a) Proposed – Total Length 73.8 4,015 13 1,387 74 3,191 Proposed – Comparison portion for Alternative 1W(a)-B 16.5 773 7 812 37 1,299 Alternative 1W(a)-B 20.9 1,114 4 921 37 1,504 1W(c) Proposed – Total Length 73.6 4,088 13 1,422 73 3,026 Proposed – Total Length 91.9 10,647 42 775 Proposed – Comparison portion for Alternative 2A 16.8 3,617 27 781 Alternative 2A 16.0 3,483 27 781 Proposed – Comparison portion for Alternative 2B 12.5 2,815 27 781 Alternative 2B 12.2 2,727 27 781 Segment 3 Proposed – Total Length 45.9 200 5 37,206 7Segment 3A Proposed – Total Length 5.1 43 2 5,529 9Proposed – Total Length 197.6 92 749 816 952 21 Proposed – Comparison portion for Alternatives 4B-4F 85.2 466 27 4,042 99 29 Alternative 4B 100.2 9 8 4,525 104 13 Alternative 4C 101.6 9 8 4,514 104 12 Alternative 4D 100.8 9 8 4,536 104 13 Alternative 4E 102.2 9 8 4,526 104 12 Alternative 4F 87.5 1,092 23 4,386 91 30 Proposed – Total Length 55.7 56 580 156 774 26 Proposed – Comparison portion for Alternatives 5A,B 22.3 66 389 188 365 25 Alternative 5A 29.7 69 473 200 421 33 Alternative 5B 40.4 44 629 258 473 30 Proposed – Comparison portion for Alternative 5C 32.9 65 468 181 461 23 Alternative 5C 26.0 22 513 182 501 27 Proposed – Comparison portion for Alternative 5D 19.2 83 198 145 303 19 Alternative 5D 17.0 85 170 130 290 20 Proposed – Comparison portion for Alternative 5E 5.8 15 66 115 165 15 Alternative 5E 5.3 15 66 112 167 15 

6 Proposed – Total Length 0.5 49 228 79 

Notes: Blank cells indicate zero acres or null value

1/ Alternative 4G was added in late 2012 and was therefore not added to this table

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 

5

Segment 

Length 

Segment Number (Miles)

41/

23

Proposed or Alternative Name

1W

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

Forest Woodlands

Pre-Con

Shrublands Gr

Table D.10-4a Page 1 of 4

Gateway West Transmission Line Final EIS
Table D.10-4a. Pre- and Post-Construction Levels of Fragmentation Resulting from Transmission Lines cont. 

Average Patch 

Size (Acre) Patch Count

Average Patch 

Size (Acre) Patch Count

Average Pat

Size (Acre

Proposed – Total Length 118.2 40 985 148 1376 60 Proposed – Comparison portion for Alternatives 7A,B 35.1 51 559 192 514 30 Alternative 7A 37.7 41 719 239 488 30 Alternative 7B 46.2 24 846 298 504 27 Proposed – Comparison portion for Alternative 7C 20.1 17 151 92 427 113 Alternative 7C 20.3 17 164 101 351 98 Proposed – Comparison portion for Alternative 7D 6.2 31 101 109 211 62 Alternative 7D 6.8 31 101 106 217 62 Proposed – Comparison portion for Alternative 7E 3.8 24 84 246 69 23 Alternative 7E 4.5 24 88 223 80 25 Proposed – Comparison portion for Alternative 7F 10.5 34 131 203 127 28 Alternative 7F 10.8 35 140 213 132 29 Proposed – Comparison portion for Alternative 7G 3.3 22 127 676 29 19 Alternative 7G 3.4 22 123 668 29 20 Proposed – Comparison portion for Alternative 7K 118.2 40 985 148 1,376 60 Alternative 7K 148.1 36 2,060 272 1,563 59 Proposed – Total Length 131.5 97 3186 55 Proposed – Comparison portion for Alternative 8A 51.9 82 1,283 62 Alternative 8A 53.6 55 1,460 68 Proposed – Comparison portion for Alternative 8B 45.3 110 1,162 60 Alternative 8B 45.8 91 989 68 Proposed – Comparison portion for Alternative 8C 6.5 73 438 41 Alternative 8C 6.4 71 451 43 Proposed – Comparison portion for Alternative 8D 6.9 105 305 138 Alternative 8D 8.1 99 325 153 Proposed – Comparison portion for Alternative 8E 7.0 87 321 83 Alternative 8E 18.3 96 517 80 Proposed – Total Length 162.2 17 89 112 3040 80 Proposed – Comparison portion for Alternative 9A 7.8 9 13 142 141 80 Alternative 9A 7.7 9 13 146 149 82 Proposed – Comparison portion for Alternative 9B 49.1 139 861 91 Alternative 9B 52.3 87 1,171 75 Proposed – Comparison portion for Alternative 9C 14.4 572 105 30 Alternative 9C 14.4 579 96 22 Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 80 1,519 88 Alternative 9D 60.1 75 1,679 74 Alternative 9F 63.3 73 1,773 78 Alternative 9G 57.8 75 1,637 75 Alternative 9H 61.0 72 1,731 80 Proposed – Comparison portion for Alternative 9E (revised) 61.4 87 1,557 80 Alternative 9E (revised) 70.6 140 1,547 65 

10 Proposed – Total Length 34.4 18 60 48 606 130 

Notes: Blank cells indicate zero acres or null valueNotes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

9

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 

Segment Forest Woodlands Shrublands Gr

Length 

(Miles)

Pre-Con

Segment Number

78

Proposed or Alternative Name

Table D.10-4a Page 2 of 4

Gateway West Transmission Line Final EIS
Average Patch 

Size (Acre) Patch Count

Average Patch 

Size (Acre) Patch Count

Avera

Siz

1W(a) Proposed – Total Length 73.8 2,270 23 942 109 Proposed – Comparison portion for Alternative 1W(a)-B 16.5 416 13 556 54 

Alternative 1W(a)-B 20.9 446 10 631 54 1W(c) Proposed – Total Length 73.6 2,311 23 979 106 Proposed – Total Length 91.9 5,808 77 Proposed – Comparison portion for Alternative 2A 16.8 1,843 53 Alternative 2A 16.0 1,774 53 Proposed – Comparison portion for Alternative 2B 12.5 1,490 51 Alternative 2B 12.2 1,443 51 Segment 3 Proposed – Total Length 45.9 200 5 15,320 17Segment 3A Proposed – Total Length 5.1 43 2 3,110 16Proposed – Total Length 197.6 88 782 740 1,051 Proposed – Comparison portion for Alternatives 4B-4F 85.2 381 33 2,899 138 Alternative 4B 100.2 9 8 3,386 139 Alternative 4C 101.6 9 8 3,283 143 Alternative 4D 100.8 9 8 3,394 139 Alternative 4E 102.2 9 8 3,291 143 Alternative 4F 87.5 838 30 3,070 130 Proposed – Total Length 55.7 50 643 128 940 Proposed – Comparison portion for Alternatives 5A,B 22.3 59 437 149 459 Alternative 5A 29.7 61 540 157 537 Alternative 5B 40.4 39 705 201 606 Proposed – Comparison portion for Alternative 5C 32.9 58 523 147 567 Alternative 5C 26.0 21 539 158 576 Proposed – Comparison portion for Alternative 5D 19.2 72 227 117 376 Alternative 5D 17.0 73 198 105 360 Proposed – Comparison portion for Alternative 5E 5.8 13 73 95 199 Alternative 5E 5.3 13 73 94 200 

6 Proposed – Total Length 0.5 46 246 

Notes: Blank cells indicate zero acres or null value

1/ Alternative 4G was added in late 2012 and was therefore not added to this table

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

Table D.10-4a. Pre- and Post-Construction Levels of Fragmentation Resulting from Transmission Lines cont. 

5

1W

2

Segment 

Length (Miles)

41/

Segment Number Proposed or Alternative Name

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 

3

Post

Forest Woodlands Shrublands 

Table D.10-4a Page 3 of 4

Gateway West Transmission Line Final EIS
Average Patch 

Size (Acre) Patch Count

Average Patch 

Size (Acre) Patch Count

Avera

Siz

Proposed – Total Length 118.2 37 1,072 126 1,617 Proposed – Comparison portion for Alternatives 7A,B 35.1 46 617 156 633 Alternative 7A 37.7 38 778 191 610 Alternative 7B 46.2 22 901 239 628 Proposed – Comparison portion for Alternative 7C 20.1 17 156 85 460 Alternative 7C 20.3 17 169 93 384 Proposed – Comparison portion for Alternative 7D 6.2 29 109 90 255 Alternative 7D 6.8 29 109 88 261 Proposed – Comparison portion for Alternative 7E 3.8 19 103 151 112 Alternative 7E 4.5 20 107 146 122 Proposed – Comparison portion for Alternative 7F 10.5 29 150 150 172 Alternative 7F 10.8 31 159 159 177 Proposed – Comparison portion for Alternative 7G 3.3 20 135 350 56 Alternative 7G 3.4 25 2014 326 2007 Proposed – Comparison portion for Alternative 7K 118.2 37 1072 126 1617 Alternative 7K 148.1 34 2198 234 1817 

Proposed – Total Length 131.5 88 3,499 Proposed – Comparison portion for Alternative 8A 51.9 76 1385 Alternative 8A 53.6 51 1584 Proposed – Comparison portion for Alternative 8B 45.3 96 1328 Alternative 8B 45.8 83 1077 Proposed – Comparison portion for Alternative 8C 6.5 68 476 Alternative 8C 6.4 66 489 Proposed – Comparison portion for Alternative 8D 6.9 94 341 Alternative 8D 8.1 89 363 Proposed – Comparison portion for Alternative 8E 7.0 71 391 Alternative 8E 18.3 78 633 Proposed – Total Length 162.2 17 93 99 3,459 Proposed – Comparison portion for Alternative 9A 7.8 9 13 115 174 Alternative 9A 7.7 9 13 119 184 Proposed – Comparison portion for Alternative 9B 49.1 123 975 Alternative 9B 52.3 77 1325 Proposed – Comparison portion for Alternative 9C 14.4 429 140 Alternative 9C 14.4 421 132 Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 70 1718 Alternative 9D 60.1 66 1930 Alternative 9F 63.3 64 2021 Alternative 9G 57.8 65 1874 Alternative 9H 61.0 63 1965 Proposed – Comparison portion for Alternative 9E (revised) 61.4 81 1675 Alternative 9E (revised) 70.6 128 1687 

10 Proposed – Total Length 34.4 17 64 45 647 

Notes: Blank cells indicate zero acres or null valueNotes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

9

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 

Table D.10-4a. Pre- and Post-Construction Levels of Fragmentation Resulting from Transmission Lines cont. 

Post

Forest Woodlands Shrublands 

Segment Number Proposed or Alternative Name

Segment 

Length (Miles)

87

Table D.10-4a Page 4 of 4

Gateway West Transmission Line Final EIS
Table D.10-4b. Change in Fragmentation Levels as a Result of Transmission Lines Between Pre- and Post-Construction

Reduction in 

Average Patch 

Size (Acre)

Change in 

Patch Count

Reduction in 

Average Patch 

Size (Acre)

Change in 

Patch Count

Reduction 

Average Pat

Size (Acre

1W(a) Proposed – Total Length 73.8 1,746 10 445 35 1,437 

Proposed – Comparison portion for Alternative 1W(a)-B 16.5 357 6 256 17 439 Alternative 1W(a)-B 20.9 669 6 290 17 469 1W(c) Proposed – Total Length 73.6 1,777 10 443 33 1,327 

Proposed – Total Length 91.9 0 0 4,840 35 291 

Proposed – Comparison portion for Alternative 2A 16.8 0 0 1,775 26 0 Alternative 2A 16.0 0 0 1,709 26 0 

Proposed – Comparison portion for Alternative 2B 12.5 0 0 1,325 24 0 

Alternative 2B 12.2 0 0 1,283 24 0 

Segment 3 Proposed – Total Length 45.9 0 0 21,886 10 0 

Segment 3A Proposed – Total Length 5.1 0 0 2,419 7 0 

Proposed – Total Length 197.6 4 33 77 99 1 Proposed – Comparison portion for Alternatives 4B-4F 85.2 85 6 1,142 39 0 

Alternative 4B 100.2 0 0 1,139 35 0 

Alternative 4C 101.6 0 0 1,231 39 0 Alternative 4D 100.8 0 0 1,142 35 0 Alternative 4E 102.2 0 0 1,234 39 0 

Alternative 4F 87.5 255 7 1,316 39 0 

Proposed – Total Length 55.7 5 63 28 166 2 Proposed – Comparison portion for Alternatives 5A,B 22.3 7 48 38 94 3 

Alternative 5A 29.7 9 67 43 116 5 

Alternative 5B 40.4 5 76 57 133 4 

Proposed – Comparison portion for Alternative 5C 32.9 7 55 34 106 2 

Alternative 5C 26.0 1 26 24 75 2 Proposed – Comparison portion for Alternative 5D 19.2 11 29 28 73 1 

Alternative 5D 17.0 12 28 25 70 2 Proposed – Comparison portion for Alternative 5E 5.8 1 7 20 34 1 

Alternative 5E 5.3 1 7 19 33 1 

6 Proposed – Total Length 0.5 0 0 4 18 7 

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

1/ Alternative 4G was added in late 2012 and was therefore not added to this table

32

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B

Segment 

Length 

(Miles)

Segment 

Number Proposed or Alternative Name

41/

5

1W

Forest Woodlands Shrublands Gr

Table D.10-4b Page 1 of 2

Gateway West Transmission Line Final EIS
Table D.10-4b. Change in Fragmentation Levels as a Result of Transmission Lines Between Pre- and Post-Construction cont.

Reduction in 

Average Patch 

Size (Acre)

Change in 

Patch Count

Reduction in 

Average Patch 

Size (Acre)

Change in 

Patch Count

Reduction 

Average Pat

Size (Acre

Proposed – Total Length 118.2 3 87 22 241 5 Proposed – Comparison portion for Alternatives 7A,B 35.1 5 58 36 119 2 

Alternative 7A 37.7 3 59 48 122 3 

Alternative 7B 46.2 1 55 59 124 2 

Proposed – Comparison portion for Alternative 7C 20.1 1 5 7 33 6 

Alternative 7C 20.3 1 5 9 33 6 

Proposed – Comparison portion for Alternative 7D 6.2 2 8 19 44 8 

Alternative 7D 6.8 2 8 18 44 8 Proposed – Comparison portion for Alternative 7E 3.8 4 19 94 43 4 

Alternative 7E 4.5 4 19 77 42 5 

Proposed – Comparison portion for Alternative 7F 10.5 4 19 53 45 5 

Alternative 7F 10.8 4 19 54 45 5 

Proposed – Comparison portion for Alternative 7G 3.3 1 8 326 27 4 Alternative 7G 3.4 1 8 322 27 4 

Proposed – Comparison portion for Alternative 7K 118.2 3 87 22 241 5 Alternative 7K 148.1 2 138 38 254 5 

Proposed – Total Length 131.5 0 0 9 313 4 

Proposed – Comparison portion for Alternative 8A 51.9 0 0 6 102 5 

Alternative 8A 53.6 0 0 4 124 6 

Proposed – Comparison portion for Alternative 8B 45.3 0 0 14 166 7 Alternative 8B 45.8 0 0 7 88 6 

Proposed – Comparison portion for Alternative 8C 6.5 0 0 6 38 3 

Alternative 8C 6.4 0 0 6 38 3 

Proposed – Comparison portion for Alternative 8D 6.9 0 0 11 36 20 

Alternative 8D 8.1 0 0 10 38 24 Proposed – Comparison portion for Alternative 8E 7.0 0 0 16 70 15 Alternative 8E 18.3 0 0 18 116 13 

Proposed – Total Length 162.2 1 4 14 419 8 Proposed – Comparison portion for Alternative 9A 7.8 0 0 27 33 10 

Alternative 9A 7.7 0 0 28 35 11 

Proposed – Comparison portion for Alternative 9B 49.1 0 0 16 114 6 

Alternative 9B 52.3 0 0 10 154 7 

Proposed – Comparison portion for Alternative 9C 14.4 0 0 143 35 1 Alternative 9C 14.4 0 0 158 36 1 Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 0 0 9 199 12 Alternative 9D 60.1 0 0 10 251 9 

Alternative 9F 63.3 0 0 9 248 10 

Alternative 9G 57.8 0 0 9 237 9 

Alternative 9H 61.0 0 0 9 234 10 Proposed – Comparison portion for Alternative 9E (revised) 61.4 0 0 6 118 7 Alternative 9E (revised) 70.6 0 0 12 140 4 

10 Proposed – Total Length 34.4 1 4 3 41 15 

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B

8

Forest Woodlands Shrublands Gr

9

Segment 

Number

7

Proposed or Alternative Name

Segment 

Length 

(Miles)

Table D.10-4b Page 2 of 2

Gateway West Transmission Line Final EIS
Table D.10-5a. Pre- and Post-Construction Levels of Fragmentation Resulting from Roads and Transmission Lines

Average Patch 

Size (Acre) Patch Count

Average Patch 

Size (Acre) Patch Count

Average Patch 

Size (Acre) 

1W(a) Proposed – Total Length 73.8 746 70 202 509 295 Proposed – Comparison portion for Alternative 1W(a)-B 16.5 361 15 170 177 162 Alternative 1W(a)-B 20.9 495 9 141 241 182 1W(c) Proposed – Total Length 73.6 759 70 205 506 299 Proposed – Total Length 91.9 374 1,195 208 Proposed – Comparison portion for Alternative 2A 16.8 280 349 260 

Alternative 2A 16.0 264 356 260 Proposed – Comparison portion for Alternative 2B 12.5 241 316 260 Alternative 2B 12.2 233 316 260 Segment 3 Proposed – Total Length 45.9 200 5 685 380Segment 3A Proposed – Total Length 5.1 43 2 607 82Proposed – Total Length 197.6 69 1,003 279 2,781 16 Proposed – Comparison portion for Alternatives 4B-4F 85.2 197 64 401 999 22 Alternative 4B 100.2 6 11 443 1,062 11 Alternative 4C 101.6 6 11 434 1,081 10 Alternative 4D 100.8 6 11 443 1,065 11 Alternative 4E 102.2 6 11 434 1,084 10 Alternative 4F 87.5 340 74 394 1,014 23 Proposed – Total Length 55.7 45 724 89 1,349 18 Proposed – Comparison portion for Alternatives 5A,B 22.3 52 496 115 597 18 Alternative 5A 29.7 51 642 118 712 22 Alternative 5B 40.4 34 806 139 879 21 Proposed – Comparison portion for Alternative 5C 32.9 51 601 109 765 17 Alternative 5C 26.0 19 610 106 857 20 Proposed – Comparison portion for Alternative 5D 19.2 62 264 82 539 14 Alternative 5D 17.0 63 228 73 517 14 Proposed – Comparison portion for Alternative 5E 5.8 12 78 65 289 12 Alternative 5E 5.3 12 78 65 287 12 

6 Proposed – Total Length 0.5 32 354 51 

Notes: Blank cells indicate zero acres or null value

1/ Alternative 4G was added in late 2012 and was therefore not added to this table

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

41/

2

Segment 

Length (Miles)

Shrublands Gras

53

Pre-Construc

Forest Woodlands 

1W

Proposed or Alternative Name

Segment 

Number

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B

Table D.10-5a Page 1 of 4

Gateway West Transmission Line Final EIS
Table D.10-5a. Pre- and Post-Construction Levels of Fragmentation Resulting from Roads and Transmission Lines cont.

Average Patch 

Size (Acre) Patch Count

Average Patch 

Size (Acre) Patch Count

Average Patch 

Size (Acre) 

Proposed – Total Length 118.2 33 1,192 82 2,488 38 Proposed – Comparison portion for Alternatives 7A,B 35.1 41 701 116 854 21 Alternative 7A 37.7 31 931 134 870 23 Alternative 7B 46.2 19 1,043 155 969 21 Proposed – Comparison portion for Alternative 7C 20.1 14 182 51 773 68 Alternative 7C 20.3 14 196 58 611 63 Proposed – Comparison portion for Alternative 7D 6.2 24 129 48 480 37 Alternative 7D 6.8 24 129 47 488 37 Proposed – Comparison portion for Alternative 7E 3.8 21 96 104 163 16 Alternative 7E 4.5 21 100 96 187 18 Proposed – Comparison portion for Alternative 7F 10.5 28 158 93 276 20 Alternative 7F 10.8 29 168 95 294 20 Proposed – Comparison portion for Alternative 7G 3.3 20 138 231 85 13 

Alternative 7G 3.4 20 134 233 83 13 Proposed – Comparison portion for Alternative 7K 118.2 33 1,192 82 2,488 38 Alternative 7K 148.1 30 2,464 140 3,047 36 Proposed – Total Length 131.5 48 6,371 31 Proposed – Comparison portion for Alternative 8A 51.9 49 2,152 38 Alternative 8A 53.6 32 2,493 38 Proposed – Comparison portion for Alternative 8B 45.3 48 2,647 30 Alternative 8B 45.8 44 2,022 34 Proposed – Comparison portion for Alternative 8C 6.5 43 740 28 Alternative 8C 6.4 42 756 29 Proposed – Comparison portion for Alternative 8D 6.9 38 845 37 Alternative 8D 8.1 37 869 40 Proposed – Comparison portion for Alternative 8E 7.0 37 748 34 Alternative 8E 18.3 39 1,271 35 Proposed – Total Length 162.2 16 96 54 6,285 40 Proposed – Comparison portion for Alternative 9A 7.8 9 13 60 331 39 Alternative 9A 7.7 9 13 64 342 40 Proposed – Comparison portion for Alternative 9B 49.1 66 1,809 49 Alternative 9B 52.3 44 2,290 38 Proposed – Comparison portion for Alternative 9C 14.4 136 443 18 Alternative 9C 14.4 132 421 14 Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 43 2,777 41 Alternative 9D 60.1 34 3,693 32 Alternative 9F 63.3 34 3,757 34 Alternative 9G 57.8 35 3,530 33 Alternative 9H 61.0 35 3,594 35 Proposed – Comparison portion for Alternative 9E (revised) 61.4 46 2,952 39 Alternative 9E (revised) 70.6 78 2,784 40 

10 Proposed – Total Length 34.4 16 65 29 1,005 60 

Notes: Blank cells indicate zero acres or null valueNotes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

Segment 

Number Proposed or Alternative Name

Segment 

Length (Miles)

Pre-Construc

Forest Woodlands Shrublands Gras

78

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B

9

Table D.10-5a Page 2 of 4

Gateway West Transmission Line Final EIS
Table D.10-5a. Pre- and Post-Construction Levels of Fragmentation Resulting from Roads and Transmission Lines cont.

Average Patch 

Size (Acre) Patch Count

Average Patch 

Size (Acre) Patch Count

Average Patc

Size (Acre) 

1W(a) Proposed – Total Length 73.8 431 121 164 625 223 Proposed – Comparison portion for Alternative 1W(a)-B 16.5 193 28 137 219 128 Alternative 1W(a)-B 20.9 202 22 119 286 147 1W(c) Proposed – Total Length 73.6 439 121 167 620 224 Proposed – Total Length 91.9 304 1,471 131 Proposed – Comparison portion for Alternative 2A 16.8 204 478 260 

Alternative 2A 16.0 194 485 260 Proposed – Comparison portion for Alternative 2B 12.5 179 424 260 Alternative 2B 12.2 174 424 260 Segment 3 Proposed – Total Length 45.9 200 5 558 467Segment 3A Proposed – Total Length 5.1 43 2 488 102Proposed – Total Length 197.6 63 1,096 239 3,248 15 Proposed – Comparison portion for Alternatives 4B-4F 85.2 161 78 320 1,249 22 Alternative 4B 100.2 6 11 341 1,382 10 Alternative 4C 101.6 6 11 333 1,409 10 Alternative 4D 100.8 6 11 341 1,385 10 Alternative 4E 102.2 6 11 333 1,412 10 Alternative 4F 87.5 282 89 323 1,237 23 Proposed – Total Length 55.7 38 851 70 1,712 16 Proposed – Comparison portion for Alternatives 5A,B 22.3 43 598 81 842 16 Alternative 5A 29.7 39 831 80 1,051 18 Alternative 5B 40.4 28 1,001 90 1,347 17 Proposed – Comparison portion for Alternative 5C 32.9 43 713 82 1,020 15 Alternative 5C 26.0 17 649 88 1,037 19 Proposed – Comparison portion for Alternative 5D 19.2 49 332 65 674 13 Alternative 5D 17.0 49 295 58 647 13 Proposed – Comparison portion for Alternative 5E 5.8 11 88 55 341 11 Alternative 5E 5.3 11 88 56 337 12 

6 Proposed – Total Length 0.5 30 375 47 

Notes: Blank cells indicate zero acres or null value

1/ Alternative 4G was added in late 2012 and was therefore not added to this table

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

Post-Constru

Forest Woodlands Shrublands Gra

Segment 

Length (Miles)

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B

41/

Segment 

Number Proposed or Alternative Name

1W

25

3

Table D.10-5a Page 3 of 4

Gateway West Transmission Line Final EIS
Table D.10-5a. Pre- and Post-Construction Levels of Fragmentation Resulting from Roads and Transmission Lines cont.

Average Patch 

Size (Acre) Patch Count

Average Patch 

Size (Acre) Patch Count

Average Patc

Size (Acre) 

Proposed – Total Length 118.2 29 1,367 66 3,070 34 Proposed – Comparison portion for Alternatives 7A,B 35.1 35 826 84 1,172 19 Alternative 7A 37.7 27 1,097 94 1,237 19 Alternative 7B 46.2 17 1,177 106 1,411 18 Proposed – Comparison portion for Alternative 7C 20.1 14 193 47 841 62 Alternative 7C 20.3 14 207 52 679 57 Proposed – Comparison portion for Alternative 7D 6.2 23 138 41 564 31 Alternative 7D 6.8 23 138 40 572 31 Proposed – Comparison portion for Alternative 7E 3.8 16 124 61 276 13 Alternative 7E 4.5 16 128 60 299 14 Proposed – Comparison portion for Alternative 7F 10.5 24 186 66 392 16 Alternative 7F 10.8 25 196 68 410 16 Proposed – Comparison portion for Alternative 7G 3.3 18 149 132 148 11 Alternative 7G 3.4 19 145 133 146 11 Proposed – Comparison portion for Alternative 7K 118.2 29 1,367 66 3,070 34 Alternative 7K 148.1 27 2,757 111 3,822 33 Proposed – Total Length 131.5 45 6,846 29 Proposed – Comparison portion for Alternative 8A 51.9 46 2,296 36 Alternative 8A 53.6 30 2,673 35 Proposed – Comparison portion for Alternative 8B 45.3 44 2,907 27 Alternative 8B 45.8 41 2,165 32 Proposed – Comparison portion for Alternative 8C 6.5 40 795 26 Alternative 8C 6.4 39 811 27 Proposed – Comparison portion for Alternative 8D 6.9 36 893 34 Alternative 8D 8.1 35 919 37 Proposed – Comparison portion for Alternative 8E 7.0 33 851 30 Alternative 8E 18.3 35 1,429 31 Proposed – Total Length 162.2 16 100 48 7,049 36 Proposed – Comparison portion for Alternative 9A 7.8 9 13 50 402 36 Alternative 9A 7.7 9 13 52 417 36 Proposed – Comparison portion for Alternative 9B 49.1 58 2,044 45 Alternative 9B 52.3 40 2,564 35 Proposed – Comparison portion for Alternative 9C 14.4 113 529 18 Alternative 9C 14.4 109 508 13 Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 39 3,106 36 Alternative 9D 60.1 31 4,058 29 Alternative 9F 63.3 31 4,123 31 Alternative 9G 57.8 31 3,883 29 Alternative 9H 61.0 32 3,948 31 Proposed – Comparison portion for Alternative 9E (revised) 61.4 43 3,159 36 Alternative 9E (revised) 70.6 71 3,034 37 

10 Proposed – Total Length 34.4 15 69 27 1,075 55 

Notes: Blank cells indicate zero acres or null valueNotes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

Segment 

Number Proposed or Alternative Name

Segment 

Length (Miles)

Post-Constru

Forest Woodlands Shrublands Gra

78

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B

9

Table D.10-5a Page 4 of 4

Gateway West Transmission Line Final EIS
Table D.10-5b. Change in Fragmentation Levels as a Result of Roads and Transmission Lines Between Pre- and Post-Construction

Reduction in 

Average Patch 

Size (Acre)

Change in 

Patch Count

Reduction in 

Average Patch 

Size (Acre)

Change in 

Patch Count

Reduction 

Average Pa

Size (Acre

1W(a) Proposed – Total Length 73.8 314 51 37 116 73 

Proposed – Comparison portion for Alternative 1W(a)-B 16.5 168 13 33 42 34 

Alternative 1W(a)-B 20.9 293 13 22 45 34 

1W(c) Proposed – Total Length 73.6 320 51 38 114 75 

Proposed – Total Length 91.9 0 0 70 276 77 

Proposed – Comparison portion for Alternative 2A 16.8 0 0 76 129 0 

Alternative 2A 16.0 0 0 70 129 0 

Proposed – Comparison portion for Alternative 2B 12.5 0 0 61 108 0 Alternative 2B 12.2 0 0 59 108 0 

Segment 3 Proposed – Total Length 45.9 0 0 128 87 0 

Segment 3A Proposed – Total Length 5.1 0 0 119 20 0 

Proposed – Total Length 197.6 6 93 40 467 1 

Proposed – Comparison portion for Alternatives 4B-4F 85.2 35 14 80 250 0 

Alternative 4B 100.2 0 0 103 320 0 

Alternative 4C 101.6 0 0 101 328 0 

Alternative 4D 100.8 0 0 102 320 0 Alternative 4E 102.2 0 0 101 328 0 

Alternative 4F 87.5 57 15 71 223 0 

Proposed – Total Length 55.7 7 127 19 363 1 

Proposed – Comparison portion for Alternatives 5A,B 22.3 9 102 33 245 2 

Alternative 5A 29.7 12 189 38 339 4 

Alternative 5B 40.4 7 195 48 468 3 

Proposed – Comparison portion for Alternative 5C 32.9 8 112 27 255 1 

Alternative 5C 26.0 1 39 18 180 1 Proposed – Comparison portion for Alternative 5D 19.2 13 68 16 135 1 

Alternative 5D 17.0 14 67 15 130 1 Proposed – Comparison portion for Alternative 5E 5.8 1 10 10 52 1 

Alternative 5E 5.3 1 10 10 50 1 

6 Proposed – Total Length 0.5 0 0 2 21 4 

1/ Alternative 4G was added in late 2012 and was therefore not added to this table

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B

23

41/

5

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

1W

Forest Woodlands Shrublands Gr

Segment 

Number Proposed or Alternative Name

Segment 

Length (Miles)

Table D.10-5b Page 1 of 2

Gateway West Transmission Line Final EIS
Table D.10-5b. Change in Fragmentation Levels as a Result of Roads and Transmission Lines Between Pre- and Post-Construction cont.

Reduction in 

Average Patch 

Size (Acre)

Change in 

Patch Count

Reduction in 

Average Patch 

Size (Acre)

Change in 

Patch Count

Reduction 

Average Pa

Size (Acre

Proposed – Total Length 118.2 4 175 16 582 4 

Proposed – Comparison portion for Alternatives 7A,B 35.1 6 125 31 318 2 

Alternative 7A 37.7 5 166 40 367 3 

Alternative 7B 46.2 2 134 49 442 2 

Proposed – Comparison portion for Alternative 7C 20.1 1 11 4 68 6 

Alternative 7C 20.3 1 11 6 68 6 

Proposed – Comparison portion for Alternative 7D 6.2 2 9 7 84 6 

Alternative 7D 6.8 2 9 7 84 6 

Proposed – Comparison portion for Alternative 7E 3.8 5 28 43 113 4 

Alternative 7E 4.5 5 28 36 112 4 

Proposed – Comparison portion for Alternative 7F 10.5 4 28 28 116 4 

Alternative 7F 10.8 4 28 27 116 4 

Proposed – Comparison portion for Alternative 7G 3.3 1 11 98 63 3 

Alternative 7G 3.4 2 11 101 63 3 

Proposed – Comparison portion for Alternative 7K 118.2 4 175 16 582 4 Alternative 7K 148.1 3 293 28 775 3 

Proposed – Total Length 131.5 0 0 3 475 2 

Proposed – Comparison portion for Alternative 8A 51.9 0 0 3 144 2 Alternative 8A 53.6 0 0 2 180 3 

Proposed – Comparison portion for Alternative 8B 45.3 0 0 4 260 3 

Alternative 8B 45.8 0 0 3 143 2 

Proposed – Comparison portion for Alternative 8C 6.5 0 0 3 55 2 

Alternative 8C 6.4 0 0 3 55 2 

Proposed – Comparison portion for Alternative 8D 6.9 0 0 2 48 3 

Alternative 8D 8.1 0 0 2 50 3 

Proposed – Comparison portion for Alternative 8E 7.0 0 0 5 103 4 Alternative 8E 18.3 0 0 4 158 4 

Proposed – Total Length 162.2 1 4 6 764 4 Proposed – Comparison portion for Alternative 9A 7.8 0 0 11 71 3 

Alternative 9A 7.7 0 0 11 75 3 

Proposed – Comparison portion for Alternative 9B 49.1 0 0 8 235 4 

Alternative 9B 52.3 0 0 5 274 4 

Proposed – Comparison portion for Alternative 9C 14.4 0 0 22 86 1 Alternative 9C 14.4 0 0 23 87 0 

Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 0 0 5 329 5 

Alternative 9D 60.1 0 0 3 365 3 

Alternative 9F 63.3 0 0 3 366 3 

Alternative 9G 57.8 0 0 3 353 3 

Alternative 9H 61.0 0 0 3 354 3 

Proposed – Comparison portion for Alternative 9E (revised) 61.4 0 0 3 207 3 

Alternative 9E (revised) 70.6 0 0 6 250 3 

10 Proposed – Total Length 34.4 1 4 2 70 5 

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B

Forest Woodlands Shrublands Gr

Proposed or Alternative Name

Segment 

Number

789

Segment 

Length (Miles)

Table D.10-5b Page 2 of 2

Gateway West Transmission Line Final EIS
Table D.10-6. Acres of Construction Impacts to Big Game Habitat Impacted by the Gateway West Transmission Line

1W(a) Proposed – Total Length 73.8 63 

Proposed – Comparison portion for Alternative 1W(a)-B 16.5 Alternative 1W(a)-B 20.9 1W(c) Proposed – Total Length 73.6 67 

Proposed – Total Length 91.9 23 58 

Proposed – Comparison portion for Alternative 2A 16.8 20 58 

Alternative 2A 16.0 20 24 

Proposed – Comparison portion for Alternative 2B 12.5 20 58 

Alternative 2B 12.2 20 24 

Segment 3 Proposed – Total Length 45.9 

Segment 3A Proposed – Total Length 5.1 

Proposed – Total Length 197.6 194 756 519 Proposed – Comparison portion for Alternatives 4B-4F 85.2 194 409 518 

Alternative 4B 100.2 788 91 

Alternative 4C 101.6 779 245 

Alternative 4D 100.8 785 91 

Alternative 4E 102.2 759 245 

Alternative 4F 87.5 235 255 488 

Proposed – Total Length 55.7 1 

Proposed – Comparison portion for Alternatives 5A,B 22.3 1 

Alternative 5A 29.7 

Alternative 5B 40.4 

Proposed – Comparison portion for Alternative 5C 32.9 1 

Alternative 5C 26.0 153 

Proposed – Comparison portion for Alternative 5D 19.2 

Alternative 5D 17.0 

Proposed – Comparison portion for Alternative 5E 5.8 Alternative 5E 5.3 

6 Proposed – Total Length 0.5 

Notes: Proposed 9 (including 9E), and Proposed 10Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero acres or null value

1/ Alternative 4G was added in late 2012 and was therefore not added to this table

3

Elk 

Elk Calving Areas Winter Range

Bighorn Sheep 

Winter Range

Segment 

Length (Miles)

41/

Proposed or Alternative Name

Moose 

Winter Rang

Segment 

Number

1W

Acres of Wildlife Habitat Impacte

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B

25

Table D.10-6 Page 1 of 2

Gateway West Transmission Line Final EIS
Table D.10-6. Acres of Construction Impacts to Big Game Habitat Impacted by the Gateway West Transmission Line cont.

Proposed – Total Length 118.2 

Proposed – Comparison portion for Alternatives 7A,B 35.1 Alternative 7A 37.7 Alternative 7B 46.2 Proposed – Comparison portion for Alternative 7C 20.1 Alternative 7C 20.3 Proposed – Comparison portion for Alternative 7D 6.2 Alternative 7D 6.8 Proposed – Comparison portion for Alternative 7E 3.8 Alternative 7E 4.5 Proposed – Comparison portion for Alternative 7F 10.5 Alternative 7F 10.8 Proposed – Comparison portion for Alternative 7G 3.3 Alternative 7G 3.4 Proposed – Comparison portion for Alternative 7K 118.2 Alternative 7K 148.1 

Proposed – Total Length 131.5 361 Proposed – Comparison portion for Alternative 8A 51.9 33 Alternative 8A 53.6 Proposed – Comparison portion for Alternative 8B 45.3 112Alternative 8B 45.8 112Proposed – Comparison portion for Alternative 8C 6.5 112Alternative 8C 6.4 115Proposed – Comparison portion for Alternative 8D 6.9Alternative 8D 8.1Proposed – Comparison portion for Alternative 8E 7.0Alternative 8E 18.3 18Proposed – Total Length 162.2 0 Proposed – Comparison portion for Alternative 9A 7.8 Alternative 9A 7.7 Proposed – Comparison portion for Alternative 9B 49.1Alternative 9B 52.3Proposed – Comparison portion for Alternative 9C 14.4Alternative 9C 14.4Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 Alternative 9D 60.1 18 Alternative 9F 63.3 18 Alternative 9G 57.8 30 Alternative 9H 61.0 30 Proposed – Comparison portion for Alternative 9E (revised) 61.4 Alternative 9E (revised) 70.6 75 

10 Proposed – Total Length 34.4 

Notes: Proposed 9 (including 9E), and Proposed 10Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero acres or null value

9

Segment 

Length (Miles)

Elk 

Winter Range

Moose 

Winter Rang

Acres of Wildlife Habitat Impacte

Proposed or Alternative Name

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B

8

Bighorn Sheep 

Winter Range Elk Calving Areas

Segment 

Number

7

Table D.10-6 Page 2 of 2

Gateway West Transmission Line Final EIS
Table D.10-7. Acres of Construction Impacts that Would Occur within a 1-mile Buffer around Raptor and Birds of Prey Nest Locations

American 

Kestrel Bald Eagle

Burrowing 

Owl

Common 

Raven

Ferruginous 

Hawk

Golden 

Eagle

Great Horned 

Owl

Long-

Ow

1W(a) Proposed – Total Length 73.8 15 12 18 80 76 6 Proposed – Comparison portion for Alternative 1W(a)-B 16.5 12 43 6 

Alternative 1W(a)-B 20.9 26 5 1W(c) Proposed – Total Length 73.6 32 20 32 126 61 24 Proposed – Total Length 91.9 182 1 117 153 847 547 44 Proposed – Comparison portion for Alternative 2A 16.8 19 1 179 106 31 Alternative 2A 16.0 30 43 47 43 5 Proposed – Comparison portion for Alternative 2B 12.5 1 159 94 30 Alternative 2B 12.2 42 58 47 2 Segment 3 Proposed – Total Length 45.9 42 63 81 223 140 35 Segment 3A Proposed – Total Length 5.1 24 18 24 23 Proposed – Total Length 197.6 95 77 20 530 251 222 142 2Proposed – Comparison portion for Alternatives 4B-4F 85.2 17 <1 20 183 74 137 13 2Alternative 4B 100.2 8 41 26 9 109 3 Alternative 4C 101.6 8 41 26 9 109 3 Alternative 4D 100.8 9 41 26 9 109 3 Alternative 4E 102.2 9 41 26 9 108 3 Alternative 4F 87.5 17 <1 20 154 74 84 13 2Proposed – Total Length 55.7 31 36 30Proposed – Comparison portion for Alternatives 5A,B 22.3 7Alternative 5A 29.7 27Alternative 5B 40.4 17Proposed – Comparison portion for Alternative 5C 32.9 30Alternative 5C 26.0Proposed – Comparison portion for Alternative 5D 19.2 31 30Alternative 5D 17.0 25 6Proposed – Comparison portion for Alternative 5E 5.8 31Alternative 5E 5.3 2

6 Proposed – Total Length 0.5

Notes: Blank cells indicate zero acres or null value

1/ Alternative 4G was added in late 2012 and was therefore not added to this table

1W

2

Raptor and Birds of Prey H

Proposed or Alternative Name

Segment Number

Segment 

Length 

(Miles)

3

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

41/

5

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, 

Table D.10-7 Page 1 of 2

Gateway West Transmission Line Final EIS
Table D.10-7. Acres of Construction Impacts that Would Occur within a 1-mile buffer around Raptors and Birds of Prey Nests cont.

American 

Kestrel Bald Eagle

Burrowing 

Owl

Common 

Raven

Ferruginous 

Hawk

Golden 

Eagle

Great Horned 

Owl

Long-

Ow

Proposed – Total Length 118.2 104 78 61Proposed – Comparison portion for Alternatives 7A,B 35.1Alternative 7A 37.7 8Alternative 7B 46.2 3Proposed – Comparison portion for Alternative 7C 20.1 74 19Alternative 7C 20.3 44Proposed – Comparison portion for Alternative 7D 6.2 20 17Alternative 7D 6.8 28Proposed – Comparison portion for Alternative 7E 3.8 49 45Alternative 7E 4.5 47 37Proposed – Comparison portion for Alternative 7F 10.5 59 45Alternative 7F 10.8 46 28Proposed – Comparison portion for Alternative 7G 3.3Alternative 7G 3.4Proposed – Comparison portion for Alternative 7K 118.2 104 78 61Alternative 7K 148.1 25 380 223 Proposed – Total Length 131.5 373 841 432 Proposed – Comparison portion for Alternative 8A 51.9 20 159Alternative 8A 53.6 250 

Proposed – Comparison portion for Alternative 8B 45.3 353 539 131 Alternative 8B 45.8 191 251Proposed – Comparison portion for Alternative 8C 6.5 1 163Alternative 8C 6.4 1 140Proposed – Comparison portion for Alternative 8D 6.9 134 147Alternative 8D 8.1 171 174Proposed – Comparison portion for Alternative 8E 7.0 107 7 56 Alternative 8E 18.3 98 243 110 Proposed – Total Length 162.2 t2/ 283 100 585 441 

Proposed – Comparison portion for Alternative 9A 7.8 17Alternative 9A 7.7 25

Proposed – Comparison portion for Alternative 9B 49.1 t2/ 94 122 179 

Alternative 9B 52.3 44 39 51 214 

Proposed – Comparison portion for Alternative 9C 14.4 t2/ 25 112 107 

Alternative 9C 14.4 44 49 51 192 Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 128 41 204 31Alternative 9D 60.1 341 380 257 Alternative 9F 63.3 324 493 205 Alternative 9G 57.8 331 292 287 Alternative 9H 61.0 313 405 228 Proposed – Comparison portion for Alternative 9E (revised) 61.4 128 204 142

Alternative 9E (revised) 70.6 104 147 83

10 Proposed – Total Length 34.4 39 38 

Notes: Blank cells indicate zero acres or null value

2/ "t" indicates only a trace amount (<0.1 acre) of impact

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

Raptor and Birds of Prey H

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, Segment Number

87

Proposed or Alternative Name

Segment 

Length 

(Miles)

9

Table D.10-7 Page 2 of 2

Gateway West Transmission Line Final EIS
1W(a) Proposed – Total Length 73.8 15 10

Proposed – Comparison portion for Alternative 1W(a)-B 16.5 27 Alternative 1W(a)-B 20.9 40 1W(c) Proposed – Total Length 73.6 8 74 Proposed – Total Length 91.9 1 3 20Proposed – Compare to Alternative 2A 16.8 t1/ 3 2

Alternative 2A 16.0 t1/ 1 25 Proposed – Compare to Alternative 2B 12.5 3 17 Alternative 2B 12.2 1 10 Segment 3 Proposed – Total Length 45.9 11

Segment 3A Proposed – Total Length 5.1 12 

Proposed – Total Length 197.6 32 104 72 24

Proposed – Comparison portion for Alternatives 4B-4F 85.2 32 59 72 50 

Alternative 4B 100.2 96 9 11Alternative 4C 101.6 89 28 10Alternative 4D 100.8 102 9 11Alternative 4E 102.2 91 28 11Alternative 4F 87.5 41 34 69 35 

Proposed – Total Length 55.7 <1 77Proposed – Compare to Alternatives 5A,B 22.3 <1 22Alternative 5A 29.7 28Alternative 5B 40.4 38Proposed – Compare to Alternative 5C 32.9 <1 60Alternative 5C 26.0 15 14Proposed – Compare to Alternative 5D 19.2 43Alternative 5D 17.0 30Proposed – Compare to Alternative 5E 5.8 4

Alternative 5E 5.3 5

6 Proposed – Total Length 0.5 28

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7BNotes: (including 8B), Proposed 9 (including 9E), and Proposed 10Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero acres or null value

1/ "t" indicates only a trace amount (<0.1 acre) of impact2/ Alternative 4G was added in late 2012 and was therefore not added to this table

Proposed or Alternative Name

Segment 

Number

5

Table D.10-8. Acres of Operations Impacts to Big Game Habitat Impacted by the Gateway West Transmission Line

Acres of Wildlife Habitat Impacted

Mule 

Winter 

Moose 

Winter Range

Elk 

Winter Range

Segment 

Length (Miles)

2

1W

42/

3

Elk Calving 

Areas

Bighorn Sheep 

Winter Range

Table D.10-8 Page 1 of 2

Gateway West Transmission Line Final EIS
Proposed – Total Length 118.2 89

Proposed – Comparison portion for Alternatives 7A,B 35.1 32Alternative 7A 37.7 20Alternative 7B 46.2 22Proposed – Compare to Alternative 7C 20.1 6Alternative 7C 20.3 9Proposed – Compare to Alternative 7D 6.2 4Alternative 7D 6.8 4Proposed – Compare to Alternative 7E 3.8 4Alternative 7E 4.5 9Proposed – Compare to Alternative 7F 10.5 18Alternative 7F 10.8 22Proposed – Compare to Alternative 7G 3.3 4Alternative 7G 3.4 4Proposed – Comparison portion for Alternative 7K 118.2 89Alternative 7K 148.1 12

Proposed – Total Length 131.5 37 95 Proposed – Compare to Alternative 8A 51.9 5 86Alternative 8A 53.6 48Proposed – Compare to Alternative 8B 45.3 11Alternative 8B 45.8 11Alternative 8B – Compare to Alternative 8C 6.5 11Alternative 8C 6.4 15Proposed – Compare to Alternative 8D 6.9Alternative 8D 8.1Proposed – Comparison portion for Alternative 8E 7.0

Alternative 8E 18.3 1

Proposed – Total Length 162.2 17 

Proposed – Compare to Alternative 9A 7.8 5Alternative 9A 7.7 5Proposed – Compare to Alternative 9B 49.1Alternative 9B 52.3Proposed – Compare to Alternative 9C 14.4Alternative 9C 14.4Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 Alternative 9D 60.1 1 

Alternative 9F 63.3 1 Alternative 9G 57.8 2 Alternative 9H 61.0 2 

Proposed – Comparison portion for Alternative 9E (revised) 61.4 

Alternative 9E (revised) 70.6 10 

10 Proposed – Total Length 34.4 28

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7BNotes: (including 8B), Proposed 9 (including 9E), and Proposed 10Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero acres or null value

89

Segment 

Length (Miles)

Acres of Wildlife Habitat Impacted

Elk Calving 

Areas

Elk 

Winter Range

Bighorn Sheep 

Winter Range

Mule 

Proposed or Alternative Name Winter 

Moose 

Winter Range

7

Table D.10-8. Acres of Operations Impacts to Big Game Habitat Impacted by the Gateway West Transmission Line cont.

Segment 

Number

Table D.10-8 Page 2 of 2

Gateway West Transmission Line Final EIS
Table D.10-9. Acres of Operations Impacts that Would Occur within a 1-mile Buffer around Raptor and Bird of Prey Nest Locations

American 

Kestrel

Bald 

Eagle

Burrowing 

Owl

Common 

Raven

Ferruginous 

Hawk

Golden 

Eagle

Great Horned 

Owl

Long-eared 

Owl

1W(a) Proposed – Total Length 73.8 4 2 3 15 15 2 Proposed – Comparison portion for Alternative 1W(a)-B 16.5 2 9 2 

Alternative 1W(a)-B 20.9 5 2 

1W(c) Proposed – Total Length 73.6 4 2 6 18 7 2 Proposed – Total Length 91.9 23 <1 10 19 95 74 5 Proposed – Comparison portion for Alternative 2A 16.8 1 <1 15 13 3 

Alternative 2A 16.0 2 5 3 8 2 Proposed – Comparison portion for Alternative 2B 12.5 <1 13 10 2 Alternative 2B 12.2 4 3 4 1 Segment 3 Proposed – Total Length 45.9 6 5 8 21 71 2 Segment 3A Proposed – Total Length 5.1 2 7 2 2 Proposed – Total Length 197.6 12 8 56 24 45 16 4 Proposed – Comparison portion for Alternatives 4B-4F 85.2 3 t1/ 23 6 15 2 4 

Alternative 4B 100.2 1 2 4 3 18 <1 Alternative 4C 101.6 1 2 4 3 18 <1 

Alternative 4D 100.8 1 2 4 3 18 <1 

Alternative 4E 102.2 1 2 4 3 18 <1 Alternative 4F 87.5 3 t1/ 19 6 9 2 4 

Proposed – Total Length 55.7 1 4 3

Proposed – Comparison portion for Alternatives 5A,B 22.3 <1Alternative 5A 29.7 4

Alternative 5B 40.4 2Proposed – Comparison portion for Alternative 5C 32.9 3

Alternative 5C 26.0Proposed – Comparison portion for Alternative 5D 19.2 1 3Alternative 5D 17.0 3 <1

Proposed – Comparison portion for Alternative 5E 5.8 1

Alternative 5E 5.3 <1

6 Proposed – Total Length 0.5

Notes: Blank cells indicate zero acres or null value

1/ "t" indicates only a trace amount (<0.1 acre) of impact2/ Alternative 4G was added in late 2012 and was therefore not added to this table

Proposed or Alternative Name

Raptor and Birds of Prey Habitat I

Segment 

Number

Segment 

Length 

(Miles)

53

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

1W

2

42/

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), 

Table D.10-9 Page 1 of 2

Gateway West Transmission Line Final EIS
Table D.10-9. Acres of Operations Impacts that Would Occur within a 1-mile Buffer around Raptors and Birds of Prey Nests cont.

American 

Kestrel

Bald 

Eagle

Burrowing 

Owl

Common 

Raven

Ferruginous 

Hawk

Golden 

Eagle

Great Horned 

Owl

Long-eared 

Owl

Proposed – Total Length 118.2 9 7 4Proposed – Comparison portion for Alternatives 7A,B 35.1Alternative 7A 37.7 2Alternative 7B 46.2 1Proposed – Comparison portion for Alternative 7C 20.1 7 2Alternative 7C 20.3 2Proposed – Comparison portion for Alternative 7D 6.2 1 2Alternative 7D 6.8 1Proposed – Comparison portion for Alternative 7E 3.8 3 2Alternative 7E 4.5 4 4Proposed – Comparison portion for Alternative 7F 10.5 5 2Alternative 7F 10.8 4 2Proposed – Comparison portion for Alternative 7G 3.3Alternative 7G 3.4Proposed – Comparison portion for Alternative 7K 118.2 9 7 4Alternative 7K 148.1 2 44 35 Proposed – Total Length 131.5 35 86 51 Proposed – Comparison portion for Alternative 8A 51.9 1 24Alternative 8A 53.6 35 

Proposed – Comparison portion for Alternative 8B 45.3 34 58 14 Alternative 8B 45.8 13 24Proposed – Comparison portion for Alternative 8C 6.5 <1 15Alternative 8C 6.4 <1 16Proposed – Comparison portion for Alternative 8D 6.9 14 15Alternative 8D 8.1 15 15Proposed – Comparison portion for Alternative 8E 7.0 8 1 3 Alternative 8E 18.3 10 19 6 Proposed – Total Length 162.2 27 13 65 53 Proposed – Comparison portion for Alternative 9A 7.8 3Alternative 9A 7.7 2Proposed – Comparison portion for Alternative 9B 49.1 8 13 20 Alternative 9B 52.3 3 1 6 18 Proposed – Comparison portion for Alternative 9C 14.4 1 10 9 Alternative 9C 14.4 3 4 6 15 Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 11 6 21 5Alternative 9D 60.1 34 31 20 Alternative 9F 63.3 31 44 15 Alternative 9G 57.8 33 27 21 Alternative 9H 61.0 31 40 17 Proposed – Comparison portion for Alternative 9E (revised) 61.4 11 21 12Alternative 9E (revised) 70.6 12 12 17

10 Proposed – Total Length 34.4 2 12 

Notes: Blank cells indicate zero acres or null valueNotes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

8

Segment 

Number

9

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), 

Proposed or Alternative Name

Segment 

Length 

(Miles)

Raptor and Birds of Prey Habitat I

7

Table D.10-9 Page 2 of 2

Gateway West Transmission Line Final EIS
Common Name Scientific Name ESA Status Federal Agency Status

State Species of 

Greatest 

Conservation Need 

(SGCN) / State 

Listed in Habitat Description

Black-footed Ferret

Mustela nigripes Endangered - SGCN / Wyoming

Ferrets use open habitat used by prairie dogs such as: grasslands, steppe, and shrub steppe. The ferrets do not diown burrows and rely on abandoned prairie dog burrows for shelter. Only large complexes (several thousand acres closely spaced colonies) can support and sustain a breeding population of black-footed ferrets. 

SGCN / Wyoming

SGCN / Idaho

Grizzly Bear Ursus arctos horribilis Threatened FS sensitive (R2) - Grizzly bears are habitat generalist, but are found most often in open mountainous habitats away from human developments. 

Northern Idaho Ground squirrel 

Spermophilus brunneus brunneus

Threatened - SGCN / Idaho

Idaho Ground Squirrels are only found in west-central Idaho within Adams and Valley counties (USFWS 2003). Ha

this species occurs in medium high elevations, surrounded by forests. Populations are typically associated with sharocky soils in xeric meadows surrounded by ponderosa pine and Douglas-fir forests.

Preble’s Meadow Jumping Mouse

Zapus hudsonius preblei

Threatened

FS sensitive (R2)

BLM sensitive

SGCN / Wyoming

This species lives primarily in heavily vegetated, shrub-dominated riparian (streamside) habitats and immediately adjacent upland habitats along the foothills (up to 100 meters from the 100-year floodplain). The species occurs in southeastern Wyoming south to Colorado Springs along the eastern edge of the Front Range of Colorado. The speoccurs in Albany, Laramie, Platte, Goshen, and Converse counties in Wyoming (USFWS 2013).

Southern Idaho Ground Squirrel

Spermophilus brunneus endemicus

Candidate FS sensitive (R4) SGCN / Idaho

The southern subspecies of the Idaho ground squirrel is found at lower elevations within hilly areas and grasslandsThese areas are often dominated by annual grassland with relict big sagebrush and bunch grasses. Distribution extefrom Emmett, Idaho, northwest to Weiser, Idaho and the surrounding area of Squaw Butte, Midvale Hill, and Henley 

in Gem, Payette, and Washington counties. Its range is bounded on the south by the Payette River, on the west by Snake River and on the northeast by lava flows.

Wolverine Gulo gulo luscus Candidate FS sensitive (R2, R4) BLM sensitive SGCN / Wyoming SGCN/ Idaho Low-density, wide-ranging species that inhabits remote forested areas, ranging over a variety of habitats. Large ho

ranges ranging from 160 to 1,440 mi2.

Greater SageGrouse Centrocercus urophasianus Candidate

MIS (Caribou NF)

FS sensitive (R2, R4)

BLM sensitive

SGCN / Wyoming

SGCN/ Idaho

Habitat occurs within basin-prairie shrub and mountain-foothill shrub communities. Greater sage grouse are only foareas where adequate sagebrush is available to meet habitat and biological needs. As a sagebrush obligate speciegreater sage grouse rely upon the plant species to meet most of its habitat needs during all aspects of its annual lifcycles. Adequate stands of sagebrush are essential as greater sage grouse rely on the leaves for food and plant stfor cover.

Interior Least Tern 

Sterna antillarum Endangered - -

Interior least terns breed in isolated areas along the Missouri, Mississippi, Ohio, Red, and Rio Grande river systems

winter home is not known, but probably includes coastal areas of Central and South America. In the U.S, terns use barren to sparsely vegetated sandbars along rivers, sand and gravel pits, or lake and reservoir shorelines from late to August.

Piping Plover Charadrius melodus Threatened - - In general, this species inhabits wide, sparsely vegetated sand or gravel beaches adjacent to vast alkali lakes; how

they can be found along the beaches near reservoirs, rivers, freshwater lakes, dry alkali lakes and industrial pondswell as sandpits and gravel mines 

Whooping Crane Grus americana Endangered - - This species inhabits shallow-water wetlands which vary in size (1–25 ha), shape, and depth. During migration, the

be found feeding in croplands and roosting in wetlands found along their migration paths. 

SGCN / Wyoming

SGCN / Idaho

Birds

Yellow-billed Cuckoo Coccyzus americanus Candidate / west of continental divide

FS sensitive (R2, R4) east 

of the continental divide

BLM sensitive

Yellow-billed Cuckoos are riparian obligate species that prefer extensive areas of dense thickets and mature deciduforests near water, and requires low, dense, shrubby vegetation for nest sites. In Wyoming, the only areas that currsupport the large cottonwood-riparian stands that are required by this species occur in isolated stands along the BigPowder, and North Platte rivers (WGFD N.D.). The Yellow-billed Cuckoo is considered an uncommon summer resiWyoming. In southwestern Idaho, the species is typically considered a ‘rare summer visitor.’ There have been consightings within Owyhee, Canyon, Elmore, Ada, Blaine, and Twin Falls counties within the last 25 years (Taylor 200

most suitable habitat in Idaho for the species occurs along the Snake River corridor (Taylor 2000).

-

Table D.11-1. ESA Threatened, Endangered, or Candidate Wildlife Species with the Potential to Occur within the Analysis Area 

MammalsCanada Lynx Lynx canadensis Threatened 

Douglas-fir and spruce/fir vegetation types. A mosaic of habitat conditions is required with denning habitat existing primarily in mature and old growth conifer stands at high elevations, while foraging habitat is found in early successconiferous forests (Butts 1992).

Table D.11-1 Page 1 of 3

Gateway West Transmission Line Final EIS
Common Name Scientific Name ESA Status Federal Agency Status

State Species of 

Greatest 

Conservation Need 

(SGCN) / State 

Listed in Habitat Description

FishBonytail Gila elegans Endangered - - Slow moving waterbodies with rocky or muddy bottoms. 

Threatened 

MIS (Sawtooth NF)

Chinook Salmon Oncorhynchus tshawytscha Threatened - SGCN / Idaho In Idaho, spawning habitat in the Snake River Basin consists of streams that are shallow, clear, and cold with a stro

upwelling of water through the gravel. Fry habitat is found primarily along the sides of pools and near the cover of ohanging banks. Adults migrate to sea for three to five years and return to natal streams days or weeks before spaw

Colorado Pikeminnow

Ptychocheilus lucius Endangered - -

The fish occurs in the warm, swift waters of the big rivers of the Colorado Basin. Adults are migratory and inhabit poand eddies just outside the main current. Young can be found in backwater areas. Colorado pikeminnow are adaptrivers with seasonally variable flow, high silt loads, and turbulence. Young-of-the-year and juvenile Colorado pikemlive in shallow backwater areas, with little or no current over silt and sand bottoms. When they are about 8 inches in length, habitat preferences change with fish seeking deeper water with some velocity. Colorado pikeminnow can toa broad range of temperatures from 35 degrees C in the summer to lower than 10 degrees C in winter.

Humpback Chub Gila cypha Endangered - -

The humpback chub lives primarily in canyons with swift currents and white water. Spawning occurs at depths rangto 3.8 meters, and water velocities of 0.15 to 0.3 meters per second, over boulder, sand, and possibly gravel substrThe humpback chub have been associated with a variety of habitats ranging from pools with turbulent to little or no current; substrates of silt, sand, boulder, or bedrock; and depth ranging from 1 meter to as deep as 15 meters. 

Pallid Sturgeon Scaphirhynchus albus Endangered - -

This species is a bottom-oriented species inhabiting the Missouri and Mississippi Rivers from Montana to LouisianaPallid sturgeon live close to the bottom of large, silty rivers with swift currents and sandy bottoms. The preferred hacomprised of sand flats and gravel bars where water velocity ranges from 10 to 90 centimeters per second and wattemperatures range from 32 to 86.degrees Fahrenheit. (http://www.epa.gov/espp/litstatus/effects/appendix_c_life_history_sturgeon.pdf)

Razorback Sucker

Xyrauchen texanus Endangered - -

The razorback sucker occurred in medium to large rivers with swift turbulent waters, as well as slow backwater areawhere it feeds on benthic fauna and flora, detritus, and plankton. Most wild fish are now found in Lake Mohave, whrepresents the largest population within the lower Colorado River basin. A few adults have also been found in Lake and Lake Havasu. In the upper basin, they can be found in unimpounded waters of the Green, Yampa, and mainstethe Colorado.

Sockeye Salmon Oncorhynchus nerka Endangered - SGCN / Idaho Sockeye inhabit streams, rivers, lakes, estuaries, and marine environments of the Pacific Coast. Spawning occurs 

rivers or streams and upwelling areas along lake beaches. Streams and rivers used for spawning must have a lake system. Fry rear in lakes and then migrate to the sea. 

Steelhead Oncorhynchus mykiss Threatened - SGCN / Idaho Spawning Steelhead require flat water greater than 9.4 inches deep with gravel small enough to dig in found betwe

areas of steep gradients with large gravel. Optimal water temperatures range from 53.6 to 64.4 degrees Fahrenheitmigrate downstream to estuaries and eventually to the sea. Adults return to natal streams to spawn. 

White Sturgeon (Kootenai River)

Acipenser transmontanus Endangered - SGCN / Idaho

In North America, white sturgeon is found from Ensenada, Mexico to the Cook Inlet in Alaska. Most are found in esof large rivers along the Pacific Coast. Older juveniles and adults are commonly found in rivers, estuaries, and marenvironments. Spawning takes place in swift currents with a rocky bottom near rapids. Adult fish tend to occur in defaster waters of large river mainstems, where they spend most of their time on or near the bottom of the riverbed. Juveniles prefer slow moving sloughs and backwaters. Spawning habitat is usually in turbulent fast water, but locatcan range from shallow murky side channels with pebbly and sandy bottoms to deeper, less murky main channels larger boulders and cobble.

Bull Trout 

Salvelinus confluentus -

In Idaho Bull trout occur in the East Fork, West Fork, and headwater tributaries and primarily in headwaters above feet elevation within the Jarbidge Wilderness Area (including Slide, Pine, Sawmill, Fall, and Cougar Creeks), as weDave Creek. Bull trout require clean, cold water (below 59 degrees Fahrenheit). Bull trout require diverse, yet well connected habitats with structural components that provide good hiding cover (boulders and large wood). Spawning habitat consists of very cold water and loose clean gravel. 

SGCN / Idaho

Table D.11-1. ESA Threatened, Endangered, or Candidate Wildlife Species with the Potential to Occur within the Analysis Area cont.

Table D.11-1 Page 2 of 3

Gateway West Transmission Line Final EIS
Common Name Scientific Name ESA Status Federal Agency Status

State Species of 

Greatest 

Conservation Need 

(SGCN) / State 

Listed in Habitat Description

SGCN / Wyoming

SGCN / Idaho

Wyoming Toad Bufo baxteri Endangered - SGCN / Wyoming

The toad is historically found only in the Laramie Basin within 30 miles from Laramie, Wyoming. By the early 1990s captured breeding program was commenced in an attempt to save the endangered toad from extinction, but no knowild reproduction has occurred since 1991. It formerly inhabited flood plains, ponds, and small seepage lakes in the shortgrass communities of the Laramie Basin. 

Bliss Rapids Snail 

Taylorconcha serpenticola Threatened - SGCN / Idaho The Bliss Rapids snail resides on the sides and undersides of rocks in free-flowing and cold-water springs in the m

Snake River, Idaho. It prefers relatively clean and rocky substrates so that it can graze on algae and diatoms at nig

Banbury Springs Limpet Lanx sp. Endangered - SGCN / Idaho

The Banbury limpet requires cold, clear and well-oxygenated water with swift currents. The Banbury limpet are founsmooth basalt, boulders, or cobble-sized grounds ranging from 2 to 20 inches deep, but they avoid areas with greealgae. Currently, this species only exists at four cold-spring locations that are isolated from each other: Thousand S

Box Canyon Springs, Briggs Springs, and Banbury Springs.

Snake River Physa Snail Physa natricina Endangered - SGCN / Idaho

The Snake River physa snail is found in the middle Snake River of southern Idaho. It is believed to be confined to tSnake River, inhabiting areas of swift current on the undersides of large cobbles and boulder-sized rocks. Individuahave been found in relatively undisturbed areas with gravel, boulder, or cobble substrates and a low percentage of epiphytic algae or macrophytes.

Bruneau Hot Springsnail 

Pyrgulopsis bruneauensis Endangered - SGCN / Idaho

The Bruneau hot springsnail occurs in thermal springs along an approximately 5 mile reach of the Bruneau River aHot Creek. The Bruneau hot springsnail inhabits small, geothermal spring runs and seeps, typically on basalt bedroTemperatures in these waters range from 15.7 to 36.9 degrees Celsius. Substrates usually comprise gravel and silindividuals are also found on sand, mud, and algal film. Macrophytes are usually absent from occupied habitat.

Notes: BLM = Bureau of Land Management; FS = U.S. Forest Service; R2 = Forest Service Region 2; R4 = Forest Service Region 4.

Table D.11-1. ESA Threatened, Endangered, or Candidate Wildlife Species with the Potential to Occur within the Analysis Area cont.

Amphibians 

Columbia Spotted Frog – Great Basin Population only 

Rana luteiventris Candidate

FS sensitive (R2, R4)

BLM sensitive

This species is aquatic and lives in or near permanent bodies of water such as: lakes, ponds, slow streams, and maThey prefer areas with thick algae and vegetation for cover, but may also hide under decaying vegetation. They mcommonly occur in non-woody wetland plant communities. 

Invertebrates

Table D.11-1 Page 3 of 3

Gateway West Transmission Line Final EIS
Common Name Scientific Name Federal Agency Status 

State Species of 

Greatest 

Conservation Need 

(SGCN) / State 

Listed in Habitat Description

Does 

American Hognosed Skunk Conepatus leuconotus FS sensitive (R2) - American hog-nosed skunks occur in riparian areas, canyons, and rocky mountain slopes. No 

MIS (Medicine Bow NF)

FS sensitive (R2)

BLM sensitive

FS sensitive (R4) SGCN / Wyoming

SGCN / Wyoming

Dark Kangaroo Mouse 

Microdipodops megacephalus BLM sensitive SGCN/ Idaho

Habitat is found in loose sands and gravel in shadscale scrub, sagebrush scrub, and alkali sink plant communities. May occur in sand dunes near margins of range. The altitude of the habitat is around 1,190-2,455 m. Burrows are constructed in soft ground with the entrance near a shrub. Average home range for males is 6,613 square meters and 3,932 for females.

Yes – 

SGCN / Wyoming

FS sensitive (R4) SGCN / WyomingFS sensitive (R2) SGCN / Wyoming

Gray Wolf Canus lupus FS sensitive (R4) SGCN / Idaho

Wolves do not exhibit particular habitat preference except for the presence of native ungulates within its territory on a year round basis. While establishing new packs, wolves have demonstrated greater tolerance of human presence and disturbance than previously thought characteristic of this species.

Yes – 

Idaho 

trans

Gunnison's prairie dog Cynomys gunnisoni FS sensitive (R2) - Basin-prairie shrub, grasslands: Habitat includes arid grassland and shrub/grassland communities. No – S

SGCN / Wyoming

FS sensitive (R2)

BLM sensitive

Little Pocket Mouse 

Perognathus longimembris BLM sensitive SGCN/ Idaho Habitat typically occurs in sagebrush, creosote bush, and cactus communities. On slopes with widely spaced shrubs, found in firm, sandy soil overlain with pebbles. In Idaho, found in shadscale/dwarf sage on lower slopes of alluvial fans in Raft River Valley. No – S

Yes – L

Fisher Martes pennanti

BLM sensitive

Idaho Pocket Gopher

Thomomy idahoensis BLM sensitive

Fringed Myotis Myotis thysanodes

SGCN/ Idaho

Shallow stony soils in open sagebrush, sagebrush-grassland, and mountain meadow habitats; Idaho Pocket Gophers are active all year long. When they excavate burrows in the winter, they leave the dirt piled in snow tunnels. Fishers prefer coniferous forests, but they are also found in mixed and deciduous forests. They prefer habitats with high canopy closure. They also prefer habitats with many hollow trees for dens. Trees typically found in fisher habitats include spruce, fir, white cedar and some 

SGCN/ Idaho hardwoods. 

BLM sensitive SGCN/ Idaho

No – T

this 

American marten Martes americana - This species inhabits mainly mature coniferous forests.

Black-tailed Prairie Dog

Cynomys ludovicianus

FS sensitive (R2) Basin-prairie shrub, grasslands: Habitat includes arid grassland and shrub/grassland communities, usually with slopes less than 12 to 15 

percent; in intermountain valleys, benches, and plateaus with diverse grass for cover. SGCN / WyomingBighorn sheep inhabit grassy mountains, alpine meadows and foothill country near rocky cliffs that allow quick escape. Common summer habitat includes grazing lands at 6,000-8,500 feet in elevation and winter habitat occurs at 2,500-5,000 feet where snow is not very deep. California bighorns, a subspecies, are found in desert canyons of southwestern Idaho, while Rocky Mountain bighorns are found in the central Idaho mountains. SGCN/ Idaho

Cliff Chipmunk Tamias dorsalis BLM sensitive

Habitat occurs within rocky, steep hillsides; Cliff chipmunks spend much of their time near cliffs. Dens typically occur in rocky outcroppings. Species generally inhabits elevations of 1500 to 3700 meters with scrub-type habitat. Species typically occurs within juniper communities (Juniperus spp.), however, it can also use oaks (Quercus spp.), maples (Acer spp.), Piñon pine (Pinus monophylla), and 

SGCN/ Idaho Ponderosa Pine (P. ponderosa) communities. 

Bighorn Sheep Ovis canadensis nelsoni FS sensitive (R2, R4)

Yes – 

Habitat occurs within semi-desert shrubland and margins of pinyon-juniper woodland. Habitat typically has a saltbush, shadscale, sagebrush, and greasewood presence. Vulpes macrotis Yes 

Kit Fox SGCN/ Idaho 

Table D.11-2. BLM Sensitive, Forest Service Sensitive, or MIS with the Potential to Occur within the Analysis Area

Mammals

BLM sensitive SGCN/ Idaho

California bighorn sheep inhabit grassy mountains, alpine meadows and foothill country near rocky cliffs that allow quick escape. Common summer habitat includes grazing lands at 6,000-8,500 feet in elevation and winter habitat occurs at 2,500-5,000 feet where snow is not very deep. California bighorns, a subspecies, are found in desert canyons of southwestern Idaho, while Rocky Mountain bighorns are found in the central Idaho mountains.

California Bighorn Sheep 

Ovis canadensis californiana

Unli

occ

add

spec

habita

is unli

Conifer forests, woodland-chaparral, caves and mine; Habitat occurs within caves, mines, snags, rock outcrops, and human structures as roost sites, with foraging habitat often occurring within riparian areas. Open water habitats provide foraging habitat and these can include streams, reservoirs, stock tanks, and other water catchments.

Table D.11-2 Page 1 of 11

Gateway West Transmission Line Final EIS
Common Name Scientific Name Federal Agency Status 

State Species of 

Greatest 

Conservation Need 

(SGCN) / State 

Listed in Habitat Description

Does 

Table D.11-2. BLM Sensitive, Forest Service Sensitive, or MIS with the Potential to Occur within the Analysis Area

Merriam’s Ground Squirrel 

Spermophilus canus vigilis BLM sensitive - Shallow stony soils; Little is known about the subspecies. Their annual cycles and diet probably are similar to southern Idaho ground squirrels. Burrow diameter usually is <2 inches; entrances often under bushes or rocks. 

New Mexico Meadow Jumping Mouse

Zapus hudsonius luteus FS sensitive (R2) - The New Mexico meadow jumping mouse is endemic to New Mexico, Arizona, and a small area of southern Colorado. It nests in dry soils, but uses moist, streamside, dense riparian/wetland vegetation up to an elevation of about 8,000 feet No – S

Pygmy Rabbit Brachylagus idahoensis FS sensitive (R4) BLM sensitive SGCN / Wyoming SGCN / Idaho Basin-prairie and riparian shrub: Species inhabits dense, tall stands of big sagebrush, usually along intermittent streams or riparian areas in sagebrush-grasslands. It is dependent on sagebrush, which comprises up to 99% of its winter diet. Also, since it excavates its own burrows, soft, deep soil is a key habitat feature. 

SGCN / Wyoming

Piute Ground Squirrel

Spermophilus mollis artemisae BLM sensitive - Species prefers areas with native shrubs, especially winterfat, and sagebrush. Yes – 

River Otter Lontra canadensis FS sensitive (R2) - Inhabits rivers, ponds, and lakes located adjacent to wooded areas. 

FS sensitive (R2, R4) SGCN / Wyoming

Snowshoe Hare Lepus americanus MIS (Medicine Bow NF) - Snowshoe hares inhabit dense young woodlands in environments with relatively deep winter snow accumulation. Optimum densities of woody shrubs and small trees range from 4,600 to 33,210 stems per ha. 

FS sensitive (R2, R4) SGCN / Wyoming

FS sensitive (R2)

BLM sensitive

FS sensitive (R2, R4) SGCN / Wyoming

Uinta Chipmunk Tamias umbrinus BLM sensitive SGCN/ Idaho

Habitat often includes coniferous forests at moderate to high elevations (to upper treeline). In Wyoming, they are reported occupying spruce-fir forest, lodgepole pine-Douglas-fir forest, and ponderosa pine forest. In more southern regions of the global range, they are most often associated with ponderosa pine habitats, but also are found in drier pinyon pine-juniper woodlands.

No – S

Yes 

specie

Analys

habita

b

Swift Fox Vulpes veloxWater Vole Microtus richardsoniTownsend’s Bigeared Bat Yes 

segme

Yes – 

SGCN / Wyoming Species prefers grasslands. Swift fox tend to be associated with short and mixed grass prairie. They form their dens in sandy soil on open prairies, in plowed fields, or along fences.

FS sensitive (R2) SGCN / Wyoming

Mammals cont.

BLM sensitive SGCN/ Idaho

No – S

FS sensitive (R2)

BLM sensitive SGCN/ Idaho

Bighorn sheep inhabit grassy mountains, alpine meadows and foothill country near rocky cliffs that allow quick escape. Common summer 

habitat includes grazing lands at 6,000-8,500 feet in elevation and winter habitat occurs at 2,500-5,000 feet where snow is not very deep. California bighorns, a subspecies, are found in desert canyons of southwestern Idaho, while Rocky Mountain bighorns are found in the central Idaho mountains.

No – 

Euderma maculatum

Long-Eared Myotis

Yes – 

This southern version of the shrew inhabits moist environments such as bogs, marshes, wet prairies, and the forested margins of lakes and streams. SGCN/ Idaho Pygmy Shrew Sorex hoyi

Myotis evotis BLM sensitive

Spotted Bat

Species occupies a wide variety of habitats typically adjacent to perennial water, from desert scrub to coniferous forest, although it is most often observed in low deserts and basins and juniper woodlands. It roosts in cracks and crevices in high cliffs and canyons. It also may occasionally roost in buildings, caves, or abandoned mines, although cliffs are the only roosting habitat in which reproductive females have been documented.

Rocky Mountain Bighorn Sheep

Ovis canadensis canadensis

Habitat for the water vole consists of a disjunct pattern of short, fragmented patches along reaches of alpine and subalpine, spring fed or glacial streams; with gravel bottoms and a slope of approximately 5 degrees. 

Species inhabits forests and basin-prairie shrub. Roosting habitat includes: caves, mines, snags, rock outcrops, and human structures. Similar habitat as the fringed myotis, but more closely associated with caves and mines for day roosts and hibernation sites. It is common in shrub-steppe, juniper woodlands and dry coniferous forests.

Corynorhinus townsendii BLM sensitive SGCN/ Idaho

SGCN / Wyoming

Species inhabits coniferous forest and woodland, including juniper, Ponderosa pine, and spruce-fir. It typically forages over rivers, streams, and ponds within the forest-woodland environment. During summer, it roosts in a wide variety of structures, including cavities in snags, under loose bark, stumps, buildings, rock crevices, caves, and abandoned mines. During winter, it probably hibernates primarily in caves and abandoned mines.

Table D.11-2 Page 2 of 11

Gateway West Transmission Line Final EIS
Common Name Scientific Name Federal Agency Status 

State Species of 

Greatest 

Conservation Need 

(SGCN) / State 

Listed in Habitat Description

Does 

Table D.11-2. BLM Sensitive, Forest Service Sensitive, or MIS with the Potential to Occur within the Analysis Area

BLM sensitive

SGCN / Wyoming

BLM sensitive

SGCN / Wyoming

FS sensitive (R2, R4) SGCN / Wyoming

BLM sensitive SGCN/ Idaho

Baird’s Sparrow Ammodramus bairdii BLM sensitive - Species utilizes grasslands and weedy fields. Species does not inhabit prairie lands where fire suppression and changes in natural grazing patterns have allowed woody vegetation to grow excessively. Baird's Sparrows prefer to nest in native prairie, but structure may ultimately be more important than plant species composition. Yes – 

Black-backed Woodpecker Picoides arcticus FS sensitive (R2) SGCN / Wyoming This species inhabits forest habitats, especially those that have experienced a recent fire, as these provide a rich food source. No – T

FS sensitive (R2) SGCN / Wyoming

Black-throated Sparrow 

Amphispiza bilineata BLM sensitive -

Species prefers a sparse, isolated desert environment. Hot, dry weather in the desert uplands, creosote bush and scrub environments are the most frequent habitats. These sparrows prefer terrain that is either steeply sloped or very flat. Besides desert uplands, they also favor alluvial fans and hill slopes, usually with much exposed rock and gravel pavement. Within the Analysis Area, habitat most likely occurs within sagebrush communities.

Yes – 

How

Black Swift Cypseloides niger FS sensitive (R2) SGCN/ Idaho

Breading black swifts inhabit sea caves and cliffs along the Pacific Coast, and adjacent to or near wet cliff sites in montane canyons. Most

nests within the interior U.S. occur on shaded cliff walls near areas of dripping water. Wintering habitat consists of similar habitats described for breeding habitat.

Yes – 

Cynomys leucurus Y

Wyoming Ground Squirrel 

Spermophilus elegans nevadensis BLM sensitive Primarily valley bottoms, foothills, grasslands and semidesert shrublands. Their geographic centers are in southwestern Montana, central and southwestern Wyoming, and southwestern Idaho, but populations occur in the states bordering these regions. 

White-tailed Prairie Dog SGCN / Wyoming

Basin-prairie shrub, grasslands: Habitat includes arid grassland and shrub/grassland communities, usually with slopes less than 12 to 15 percent; typically higher elevations than the black tailed prairie dog, in intermountain valleys, benches, and plateaus with diverse grass and forb cover. Where it occurs east of the Continental Divide in Wyoming, it probably occupies areas that are too dry for the black-tailed prairie dog.

FS sensitive (R2)

American Bittern Botaurus lentiginosus FS sensitive (R2)

SGCN/ Idaho

SGCN / Wyoming

Limited information is available regarding the habitat requirements of Wyoming pocket gophers. The species seems to prefer loose, gravelly, upland soils, often where greasewood is growing. This species’ range is relatively limited, and populations are small; consequently, few animals have ever been found. The species is the only vertebrate animal that occurs exclusively in Wyoming. The current known distribution is restricted to the south-central portion of the state. 

Ye

distrib

that 

Habitat occurs on a variety of aquatic and wetland habitats, including rivers, lakes, reservoirs (both large and small), estuaries, bays, marshes, and sometimes in inshore marine habitats. These habitats are used variously for nesting, loafing, and feeding. Nesting colonies usually are situated on islands or peninsulas in brackish or freshwater lakes, where they are isolated from mammalian predators. 

Yes 

FS sensitive (R2)

Thomomys clusius

This species nests near freshwater wetlands with tall, emergent vegetation or in grassy, upland areas in close proximity to such wetlands. Nesting habitat is typically close in proximity to foraging habitat which consists of emergent wetland vegetation. Yes – 

Birds

Y

Wyoming Pocket Gopher

SGCN / Wyoming

American White Pelican

Pelecanus erythrorhynchos BLM sensitive

Black Tern Chlidonias niger Preferred summer habitats for this species occurs in inland marshes and sloughs, typically with fairly dense cattail or other marsh vegetation and pockets of open water. These wetlands are often shallow in nature. Winter habitat is on the coasts of South America. 

SGCN/ Idaho

Bald Eagle Haliaeetus leucocephalus

Species typically occurs close to fish bearing open water, including major rivers, lakes, and reservoirs. Generally occupy riparian or lacustrine habitat as breeders but occasionally exploit upland areas for food. On rivers, they concentrate on runs and pools, riffles are important seasonally as prey fishes are spawning; lakes and reservoirs are used in shallow areas with gentle sloped shorelines and wetlands. Winter foraging habitat can include upland areas where they feed on carrion, and small mammals.

Yes – 

the A

transm

April 

the 

Ha

identif

April 1

perche

in the 

BLM sensitive SGCN/ Idaho

Mammals cont.

Table D.11-2 Page 3 of 11

Gateway West Transmission Line Final EIS
Common Name Scientific Name Federal Agency Status 

State Species of 

Greatest 

Conservation Need 

(SGCN) / State 

Listed in Habitat Description

Does 

Table D.11-2. BLM Sensitive, Forest Service Sensitive, or MIS with the Potential to Occur within the Analysis Area

SGCN / Wyoming

FS sensitive (R2) SGCN / WyomingFS sensitive (R2) SGCN / Wyoming

California Spotted Owl

Strix occidentalis occidentalis FS sensitive (R4) -

The California spotted owl's range overlaps that of the northern spotted owl in the southern Cascade Range, and extends south through the western Sierra Nevada to Tulare County. They also occur in discrete populations in mountainous areas of coastal and southern California from Monterey County to northern Baja California.

No – T

Cassin's Sparrow Aimophila cassinii FS sensitive (R2) - This species breeds in habitats that are dominated by grasses but have some percentage of shrub cover as well. Nests are located placed on the ground or just off the ground, within a low shrub. No – T

Calliope Hummingbird Stellula calliope BLM sensitive - Species is a summer resident within the region. Summer habitat is mostly montane communities, breeding at elevations ranging from 3,900 ft to timberline. Species occupies habitats ranging from riparian forests to shrub-sapling secondary growth to open montane forests. Yes – 

and s

MIS (Caribou NF) SGCN / Wyoming

FS sensitive (R2, R4)

BLM sensitive

Common Loon Gavia immer FS sensitive (R4) -

This species generally inhabits clear, oligotrophic lakes, surrounded by forest, with rocky shorelines, deeply indented bays, numerous islands, and floating bogs. Forest types are characteristic of boreal and mixed forests. Idaho and Wyoming do not generally provide habitat for the common loon; however, there is a small area of breed habitat located on the border of Idaho, Wyoming, and Montana; north

of the Project area.

FS sensitive (R2) SGCN / Wyoming

FS sensitive (R2, R4)

BLM sensitive

Greater PrairieChicken Tympanuchus cupido FS sensitive (R2) - This grassland species inhabits mid-tallgrass and tallgrass of the Great Plains region. No – T

Yes – 

Species preferred habitat varies throughout its range but includes mainly old-growth forests with woodpecker cavities for nesting. They inhabit a range of forests from pure coniferous to pure deciduous forests. Idaho they were found to favor spruce-fir or subalpine-fir above 5,000 ft. elevation. Hunting habitat includes forest meadows and open forests. Boreal Owl Aegolius funereus FS sensitive (R2, R4)

BLM sensitive

Spizella breweri

SGCN/ Idaho

Brewer’s Sparrow

SGCN/ Idaho

Species is closely associated with sagebrush, preferring dense stands broken up with grassy areas. In the northern part of their range, they can be found in habitats such as sub-alpine fir or dwarf birch, or montane pinon-juniper woodlands. 

Yes – 

are 

Yes – 

BLM sensitive 

Burrowing Owl Athene cunicularia Grasslands, basin-prairie shrub: owls use vacant rodent burrows, mainly associated with prairie dog habitat. In Wyoming, the highest concentrations of burrowing owls are in the south and east, although they occur and breed throughout the state (WGFD. ND). SGCN/ IdahoColumbian SharpTailed Grouse Tympanuchus Phasianellus columbianus

Species inhabits mountain-foothills shrub communities of serviceberry, snowberry, chokecherry, and Gambel oak; sagebrush-grassland; and willow riparian habitats. In Wyoming, it prefers mountain-foothills shrub and sagebrush-snowberry habitats in the transitional zone between sagebrush-grass and forested habitats. Forest habitats (riparian draws) may provide winter forage. Leks are the center of breeding activity and are typically located in areas with little slope and low, sparse vegetation, such as knolls, ridgetops, or benches that allow good visibility. 

Yes 

habit

Chestnut-Collared Longspur Calcarius ornatus FS sensitive (R2)

SGCN/ Idaho

This species is a native prairie obligate, and prefers level to rolling native mixed-grass and shortgrass uplands. In drier areas it can be found in moist lowlands. SGCN / Wyoming 

Ferruginous Hawk Buteo regalis

Species uses mixed-grass prairie communities and is often associated with little bluestem, prairie June grass, green needle-grass, western wheatgrass, and Kentucky bluegrass. Trees are common nest sites, including eastern cottonwoods, peachleaf willow, juniper, box

elder maple, green ash, Chinese elm, and American elm. Species also uses sagebrush and saltbrush, greasewood shrublands. 

Yes – 

Are

segm

BLM sensitive SGCN/ Idaho

Flammulated Owl Otus flammeolus SGCN/ Idaho Species is associated with mature and old-growth xeric ponderosa pine/Douglas-fir stands with preference for mature growth with open canopy avoiding dense young stands.Nests in woodpecker holes made in mature aspen or ponderosa pine habitat. Yes 

Great Gray Owl Strix nebulosa FS sensitive (R4) SGCN / Wyoming Species favors dense, mature coniferous forests with close proximity to meadows or open fields. This combination allows conifer nesting and roosting along with the abundance of small rodents that occur in forest openings. Yes 

Birds cont.

Table D.11-2 Page 4 of 11

Gateway West Transmission Line Final EIS
Common Name Scientific Name Federal Agency Status 

State Species of 

Greatest 

Conservation Need 

(SGCN) / State 

Listed in Habitat Description

Does 

Table D.11-2. BLM Sensitive, Forest Service Sensitive, or MIS with the Potential to Occur within the Analysis Area

SGCN / Wyoming

Golden Crowned Kinglet Regulus satrapa MIS (Medicine Bow NF) - This species inhabits dense, coniferous forests, especially where spruce or firs are present. 

Gunnison SageGrouse Centrocercus minimus FS sensitive (R2) - This sage-grouse species inhabits a variety of habitats: such as sagebrush habitats with a diversity of grasses and forbs and healthy, as well as wetland and riparian areas. No – T

Hammond’s Flycatcher 

Empidonax hammondii BLM sensitive - Species inhabits cool forests, especially coniferous or mixed forests with fir trees. Hammond's Flycatchers have been found to favor old- growth associates in Douglas-fir/ponderosa pine forests. Yes 

SGCN / Wyoming

FS sensitive (R2) SGCN / Wyoming

Lesser PrairieChicken Tympanuchus pallidicinctus FS sensitive (R2) - This species inhabits xeric grasslands of the southwestern Great Plains region. No – T

Lincoln’s Sparrow Melospiza lincolnii MIS (Medicine Bow NF) - Habitat information on this species is limited, but based on what is known, they seem to prefer riparian willow habitats at elevations between 2,050 and 2,260 m. 

FS sensitive (R2)

BLM sensitive

FS sensitive (R2) SGCN / Wyoming

McCown's Longspur Calcarius mccownii FS sensitive (R2) SGCN / Wyoming This species inhabits shortgrass prairies which contain sparse vegetation coverage. They can utilize agricultural areas (predominantly within their northern range). 

Mountain Plover Charadrius montanus FS sensitive (R2) BLM sensitive SGCN / Wyoming Species inhabits low, open habitats such as arid shortgrass and mixed grass prairies dominated by blue grama and buffalo grass with scattered clumps of cacti and forbs, and saltbush habitats of the shrub-steppe of central and western Wyoming. It prefers to nest in large, flat grassland expanses with sparse, short vegetation (10 cm or less), and bare ground. It is adapted to areas that have been disturbed by prairie dogs, heavy grazing, or fire. Yes – 

FS sensitive (R4)

BLM sensitive

MIS (Caribou, Medicine Bow, 

Sawtooth NF)

FS sensitive (R2, R4)

Grasshopper Sparrow Ammodramus savannarum FS sensitive (R2) This species inhabits open grassland habitats. It prefers grassland patches that are at least 8 ha or larger in size. SGCN/ Idaho

Harlequin Duck Histrionicus histrionicus FS sensitive (R2, R4) Species prefers cold, shallow, rapid mountain streams away from concentrated human activities. It nests on the ground along streams with less than 5% gradient, dense shrubs lining the banks, braided channels, swift currents, abundant aquatic insects, and good water quality. 

Lewis’s Woodpecker Melanerpes lewis

Species prefers open ponderosa pine forest, open riparian woodland dominated by cottonwood, and logged or burned pine forest. May prefer ponderosa pine forest at medium to high elevations and open riparian forests at low elevations. Often classified as a specialist in burned pine forest habitat although suitability of burned areas may vary with post-fire age, size, and intensity of burn.

Yes 

SGCN/ Idaho

Loggerhead Shrike Lanius ludovicianus -

Species habitat occurs in basin-prairie shrub and mountain-foothill shrub. Species prefers open habitat including shrub-steppe, deserts and grasslands with access to elevated perches and impaling stations. Feeds mostly on large insects such as grasshoppers and beetles but some small birds and rodents are also taken. 

Yes – 

has 

Long-billed Curlew

Numenius americanus

Habitat occurs in grasslands, plains, foothills, and wet meadows. Species selects open habitats year-round. During the breeding season, they frequent prairies and grasslands, as well as plowed fields, meadows, and pastures. 

Ye

Analyhas b

propos

bee

Mountain Quail Oreortyx pictus SGCN/ Idaho

Habitat includes mixed evergreen forests and woodlands. Species are typically found in dense cover with scattered open areas on slopes in foothills and mountains. They use the dense thickets resulting from fires or clearcuts, and they are seldom found far from this cover. In summer, the quail require a source of water, which may limit their nesting range.

SGCN/ Idaho

Accipter gentilis SGCN / Wyoming

Species occurs within mature conifer and deciduous forests. Species is a forest habitat generalist and requires abundant prey base, possibly related to understory shrub development in forested habitat. Generally considered to prefer mature coniferous forests, but will also inhabit deciduous and mixed forests from sea level to subalpine areas.

BLM sensitive

Yes 

Northern GoshawkBirds cont.

BLM sensitive

BLM sensitive

SGCN/ Idaho

Table D.11-2 Page 5 of 11

Gateway West Transmission Line Final EIS
Common Name Scientific Name Federal Agency Status 

State Species of 

Greatest 

Conservation Need 

(SGCN) / State 

Listed in Habitat Description

Does 

Table D.11-2. BLM Sensitive, Forest Service Sensitive, or MIS with the Potential to Occur within the Analysis Area

Northern Harrier Circus cyaneus FS sensitive (R2) -

This species inhabits a wide range of open wetland and upland habitats during the breeding season, including fresh to alkali wetlands, wet or dry grasslands, lightly grazed agricultural pastures, old fields, brushy areas, and cold desert shrub-steppe. In the nonbreeding season, the northern harrier uses a wide variety of open habitats with herbaceous cover, including freshwater and saltwater wetlands, grasslands, idle fields, agricultural pastureland, desert, and, to a lesser extent, cropland

Yes 

FS sensitive (R2)

BLM sensitive

FS sensitive (R2, R4) SGCN / Wyoming

Pileated Woodpecker Dryocopus pileatus MIS (Sawtooth NF) -

This species can be found within late successional stages of coniferous or deciduous forest, as well as younger forests that have scattered, large, or dead trees. This species is not found within Wyoming, but does have year round breeding habitat in the northern half of Idaho (north of the Project area). 

Prairie Falcon Falco mexicanus BLM sensitive - This species tends to occupy open treeless terrain including prairies, deserts, riverine escarpments, canyons, foothills, and mountains. 

Purple Martin Progne subis FS sensitive (R2) - This species nests in forest edges and clearings adjacent to waterbodies. 

Likely 

area, 

FS sensitive (R2)

BLM sensitive

SGCN / Wyoming

Swainson's Hawk Buteo swainsoni BLM sensitve - This species inhabits open pine-oak woodlands with a abundant shrub-grass component, grasslands, and cultivated farmlands. Nests in trees or bushes. 

MIS (Medicine Bow NF) SGCN / Wyoming

FS sensitive (R2, R4)

BLM sensitive

FS sensitive (R2, R4) SGCN / Wyoming

SGCN / Wyoming

Olive-sided Flycatcher Contopus borealis -

Olive-sided flycatchers are generally restricted to coniferous or mixed-coniferous forests. Throughout their breeding range, they primarily occur in montane, subalpine, and boreal forests. In addition, they often occur along wooded shores of lakes, rivers, and bogs where forest edges, variation in tree height, and standing dead trees are found. This species is most often associated with forest edges and openings caused by natural or anthropogenic disturbances, including small forest gaps resulting from tree death in old-growth forests, or along the edges of early successional forests. Olive-sided flycatchers usually do not occur in closed canopy forests and are uncommon in forests in the sapling-pole or mature forest stages that lack gaps or edges.

Birds cont.Peregrine Falcon Falco peregrinus Tall cliffs: Nests near rocky cliffs and often hunts near water. 

BLM sensitive BLM sensitive SGCN / Wyoming

Basin-prairie shrub, mountain-foothill shrub: The species is a sagebrush obligate as they are common inhabitants of shrub-steppe communities that are dominated by big sagebrush. Nest-site selection is specific as most nests are located within or beneath sagebrush plants with high foliage and branch density. Dense patches of large sagebrush plants and low densities of exotic plants also seem to be an

important habitat characteristic for sage thrashers

Sage Sparrow Amphispiza belli SGCN / Wyoming

Basin-prairie shrub, mountain-foothill shrub: Species breeds in open, shrublands, most commonly in sagebrush grassland areas. These sparrows favor dense stands of sagebrush with a modest amount of understory vegetation. Winter habitat for sage sparrows is found in open flats, deserts and dry chaparral of the Southwest

Short Eared Owl Asio flammeus FS sensitive (R2) The short eared owl typically inhabits open habitats including grasslands, sagebrush, marshes, and tundra. SGCN/ Idaho Sage Thrasher Oreoscoptes montanus

Cygnus buccinator

SGCN/ Idaho

Lakes, ponds, rivers; Species nest on the margins of interconnected shallow marshes and lakes, lakes within forest or sagebrush habitat, and oxbows of rivers. They prefer stable, quiet, shallow waters where small islands, muskrat houses, or dense emergent vegetation provide nesting and loafing sites. Nutrient-rich waters, with dense aquatic plant and invertebrate growth, provide the best habitat

Upland Sandpiper 

This species inhabits old growth spruce-fir as well as lodgepole pine forests. These birds will also exploit recently burned forests, as these provide a rich food source. 

Trumpeter Swan

SGCN/ Idaho

Three-Toed Woodpecker Picoides dorsalis

No 

Bartramia longicauda BLM sensitive

Native grassland: Species requires taller grass for nesting. It is almost never found on mudflats or in wetland environments where other shorebirds are found. Nests on pasture, prairie remnants, hayfields, summer fallow (bare soil), mulched grain stubble, standing grain stubble, and growing grain, but was most common in nontilled uplands (road rights-of-way, vegetation around prairie wetlands, heavily grazed wetlands, and small tracts of idled grasslands).

BLM sensitive SGCN/ Idaho

SGCN/ Idaho

Table D.11-2 Page 6 of 11

Gateway West Transmission Line Final EIS
Common Name Scientific Name Federal Agency Status 

State Species of 

Greatest 

Conservation Need 

(SGCN) / State 

Listed in Habitat Description

Does 

Table D.11-2. BLM Sensitive, Forest Service Sensitive, or MIS with the Potential to Occur within the Analysis Area

Virginia’s Warbler Vermivora virginiae BLM sensitive SGCN/ Idaho

Typically found in pinyon-juniper and oak woodlands. Nests found in dense thickets of mountain mahogany and some populations breed in

high, mixed-conifer forests. Occupies scrubby habitats below the pine belt and surrounding conifers. Never occurs in coniferous forest where there is not a deciduous mix. Strong association for breeding in steep draws, drainages, or slopes with oak or other shrubby vegetation.

SGCN / Wyoming

FS sensitive (R4)

BLM sensitive

White‐tailed Ptarmigan Lagopus leucura FS sensitive (R2) - This species inhabits alpine ecosystems at or above treeline as well as stream courses and meadows within the subalpine zone. 

Williamsons Sapsucker 

Sphyrapicus thyroideus BLM sensitive - Open coniferous forests. Breeds at middle to high elevations, generally from 4,900–10,500 feet. Nests at lower elevations (from 2,800–4,250 feet) at the northern edge of its range. Yes – 

Wilson’s Warbler Wilsonia pusilla MIS (Medicine Bow NF) - This species of warbler inhabits mesic shrub communities or willow woodlands located near the edges of beaver ponds and lakes, riparian zones, fens, bogs, and overgrown clear-cuts. 

Big Lost River Whitefish

Prosopium williamsoni FS sensitive (R4) SGCN / Wyoming This species inhabits larger tributaries and the mainstem of the Big Lost River. Two metapopulations currently exist: one above and one below the Mackay Dam. No – 

SGCN / Wyoming

FS sensitive (R4) SGCN / Wyoming

FS sensitive (R2, R4)

BLM sensitive

Common Trout

brook trout (Salvelinus fontinalis), rainbow trout (Oncorhynchus mykiss) , and brown trout (Salmo trutta)

MIS (Medicine Bow NF) - Found in cold waters of the Yampa, North Platte, and Colorado Rivers. 

Finescale Dace Phoxinus neogaeus FS sensitive (R2) SGCN / Wyoming Finescale dace typically occur in cool, boggy lakes and sluggish, acidic streams. They are commonly found in lakes and ponds and are often associated with beaver ponds. 

SGCN / Wyoming

Plegadis chihi BLM sensitive

Marshes, wet meadows: Frequently feeds in shallowly flooded wetlands of short, emergent plants, such as sedges, spikerushes, glassworts, inland saltgrass, and black greasewood. Nearby irrigated crops, particularly alfalfa, barley, and native hay meadows are important feeding sites. Water appears to be a requirement for a suitable feeding site. Usually nests in emergent vegetation or low trees and shrubs over shallow water, use hardstem bulrush, alkali bulrush, cattails, or build a stick nest in small willows.

Ye

White-faced Ibis

Picoides albolarvatus

SGCN/ Idaho

BLM sensitive SGCN / Wyoming 

White-headed Woodpecker 

Breeding habitat consists of deciduous thickets, especially willows and often near water. Winters in shrubby clearings and early successional growth. Yes – 

SGCN/ Idaho Species prefers semi-open areas with large, mature trees, providing 40-70% canopy. Forages on live, mature conifers with deeply creviced and scaly bark (Raphael and White 1984). Nest and roost cavities and trees provide cover. 

Empidonax trailii

N

Willow Flycatcher 

Bluehead Sucker

FS sensitve (R2)

BLM sensitive

Bear, Snake, and Green drainages, all waters. This species has been reported to typically be found in runs or riffles with rock or gravel substrate. Juveniles have been collected from shallow riffles, backwaters, and eddies with silt or gravel substrate. Although the species generally inhabits streams with cool temperatures, bluehead suckers have been found inhabiting small creeks with water temperatures as high as 82.4°F). This species is found in a large variety of river systems ranging from large rivers with discharges of several hundred cubic meters per sec to small creeks with less than a 0.05 cubic meters per second (1.8 cubic feet per sec).

Bonneville Cutthroat Trout Clear mountain streams within the Bonneville basin, along the Bear River drainage. 

SGCN / Idaho 

Colorado River Cutthroat Trout SGCN / Wyoming Clear mountain streams along the Colorado River drainages located above the Grand Canyon; including the Green River. 

FS sensitve (R4)

BLM sensitive

Fine-spotted Cutthrout Trout, Snake River Cutthroat

BLM sensitive

Oncorhynchus clarki spp SGCN / Idaho Snake River drainage, clear, fast water Oncorhynchus clarki pleuriticusOncorhynchus clarki utahCatostomus discobolus

SGCN / Idaho

Birds cont.Fish

Table D.11-2 Page 7 of 11

Gateway West Transmission Line Final EIS
Common Name Scientific Name Federal Agency Status 

State Species of 

Greatest 

Conservation Need 

(SGCN) / State 

Listed in Habitat Description

Does 

Table D.11-2. BLM Sensitive, Forest Service Sensitive, or MIS with the Potential to Occur within the Analysis Area

Flannelmouth Sucker

Catostomus latipinnis

FS sensitive (R2)

BLM sensitive

SGCN / Wyoming

Colorado River drainage, large rivers, streams and lakes. Although preferring large rivers with deep riffles and runs, they can also be found in smaller streams and sometimes in lakes. Native to the Colorado River drainage basin, in Wyoming it’s found in the Green and Little Snake river drainages. In the spring they leave the large rivers and ascend small tributary streams to spawn;

SGCN / Wyoming

Northern Leatherside Chub

Lepidomeda copei(formally Gila copei)

FS sensitive (R4)

BLM sensitive

SGCN / Wyoming

The leatherside chub inhabits deep pools in medium sized streams that have cool water temperatures between 60 and 75 degrees farenheit. They are found in streams with dense vegetation or abundant lateral habitat. Along the Project area, they can be found in the northeastern portions of the Bonneville Basin, as well as Snake and Bear River drainages along the Wyoming-Idaho-Utah border. Introduced populations can also be found within the Colorado River system.

Yes 

abov

Creek, 

popula

Northern Redbelly Dace Phoxinus eos FS sensitive (R2) - Found in slow moving, spring fed streams which contain abundant vegetation and large wood debris. 

Redband Trout Oncorhynchus mykiss gairdneri BLM sensitive SGCN / Idaho Redband trout occur in inland drainages of the Pacific Northwest. Great Basin redband trout are found in arid forest and desert environments characterized by extreme fluctuations in stream flow and temperature. 

Rio Grande Chub Gila pandora FS sensitive (R2) - Current distribution limited to the tributary systems of the Rio Grande. Can be found in cool, fast flowing reaches with gravel or cobble substrates, and banks with overhanging vegetation. 

Rio Grande Cutthroat Trout

Oncorhynchus clarkii virginalis FS sensitive (R2) - Current distribution is limited to tributaries of the Rio Grande in Colorado and New Mexico. Found in small, high elevation streams. This species of trout is more of a generalist than other Oncorhynchus . 

Rio Grande Sucker

Catostomus plebeius FS sensitive (R2) - Current distribution limited to the tributary systems of the Rio Grande. Found in slow moving waters that contain course substrates. 

FS sensitive (R2)

BLM sensitive

Shoshone Sculpin Cottus greenei BLM sensitive SGCN / Idaho

Shoshone sculpin are found in approximately two dozen springs/streams in the Hagerman Valley. Their habitat is essentially restricted to the clear, cool (60.8 degrees Fahrenheit) well oxygenated water of the Thousand Springs Formation. They select low velocity waters with abundant gravel, rock, and aquatic vegetation. 

Southern Leatherside Chub

Lepidomeda aliciae(formally Gila copei) FS sensitive (R4) - This species is native to streams and rivers of the southeastern portion of the Bonneville Basin; similar habitats to the northern leatherside chub, but with a most southern distribution. Occurs in Utah Lake and Sevier River drainages Unli

Southern Redbelly Dace

Phoxinus erythrogaster FS sensitive (R2) - Found predominantly within slow moving headwaters and upland creeks with abundant bank vegetation and large woody debris. Prefers clear waters and a gravel substrate. 

Sturgeon Chub Macrhybopsis gelida FS sensitive (R2) SGCN / Wyoming Found in fast moving streams with high turbidity. Often in shallow waters such as rock or gravel riffles. 

Flathead Chub Platygobio gracilisFish cont.

Couesius plumbeus 

FS sensitive (R2) SGCN / Wyoming 

Near the Project area, this species is found in the northern portion of Wyoming including the Big Horn, Tougue, Powder, Little Powder, Belle Fourche, and Cheyenne River systems. This species distribution in Wyoming is north of the project area.

Yes 

SGCN / Wyoming Margariscus margarita

Hybognathus placitus

Hornyhead Chub SGCN / WyomingMountain Sucker FS sensitive (R2) SGCN / Wyoming This species can be found in small headwater streams along the Snake River, and lentic habitats such as the Lower Green River Lake. Pearl Dace FS sensitive (R2)

Nocomis biguttatusCatostomus platyrhynchus

Found in small to medium sized streams, with gravel and rock substrates, and warm waters with abundant aquatic vegetation.Found in glacial scour lakes and rivers with clear water and gravel bottoms. SGCN / Idaho Lake Chub FS sensitive (R2)

FS sensitive (R2)

BLM sensitive

Plains Minnow FS sensitive (R2) SGCN / Wyoming Found along the channels of shallow, fluctuating streams with shifting sand substrates.

SGCN / Wyoming

Colorado River drainage, mostly large rivers, also streams and lakes below 7,546 feet. Streams should have a complexity of pool and riffle habitats. Juveniles and adults are typically found in relatively deep, low-velocity habitats that are often associated with woody debris or other types of cover. Substrate in roundtail chub habitat may range from rock and gravel to silt and sand. Larvae have been reported in low velocity areas associated with backwater habitats. Temperature tolerance of roundtail chub has been reported up to 102.2 °F, but temperature preference ranges between 71.6 ° and 75.2 °F.

Found in slow moving, spring fed streams with well vegetated banks, and a diverse system of pool habitats. 

Roundtail Chub

Gila robusta

Table D.11-2 Page 8 of 11

Gateway West Transmission Line Final EIS
Common Name Scientific Name Federal Agency Status 

State Species of 

Greatest 

Conservation Need 

(SGCN) / State 

Listed in Habitat Description

Does 

Table D.11-2. BLM Sensitive, Forest Service Sensitive, or MIS with the Potential to Occur within the Analysis Area

Wood River Sculpin Cottus leiopomus

FS sensitive (R4)

BLM sensitive

SGCN / Idaho

The Wood River sculpin occurs only in the Wood River drainage in south–central Idaho. The Wood River sculpin occurs mainly in small to medium sized streams with cool, clear waters and a swift current. Individuals are most commonly found in riffles and runs with a gravel or cobble substrate.

FS sensitive (R2, R4) SGCN / Wyoming

ReptilesCommon Garter Snake Thamnophis sirtalis BLM sensitive SGCN / Wyoming Common Garter Snakes are usually found in habitats associated with water, such as streams, rivers, lakes, ponds and marshes. They can also be found in open meadows and coniferous forests 

Longnose Snake Rhinocheilus lecontei BLM sensitive SGCN / Idaho Arid and semi-arid deserts, grasslands, shrublands, and prairies. Sea level to 6,200 ft. 

Desert Massasuga Rattlesnake

Sistrurus catenatus edwardsii FS sensitive (R2) - This species inhabits shortgrass prairie habitat. No – T

Midget Faded Rattlesnake

Crotalus viridis concolor BLM sensitive SGCN / Wyoming Mountain foothills shrub, rock outcrop in sagebrush desert. Y

Mojave Blackcollared Lizard Crotaphytus bicinctores BLM sensitive SGCN / Idaho Isolated populations occur in eastern Idaho and Utah. Prefers arid rocky hilly deserts with sparse vegetation, but sometimes found in areas with few rocks. Ye

Western Ground Snake 

Sonora semiannulata BLM sensitive SGCN / Idaho Inhabits areas with surface cover and some moisture: grassland, riverbottoms, desert flats, ranchland, sand hummocks, open rocky hillsides with loose soil, sandy washes, dry streambeds, and riparian thickets. 

FS sensitive (R2, R4)

BLM sensitive

Great Basin Spadefoot Spea intermontana BLM sensitive SGCN / Wyoming

Spring seeps, permanent and temporary waters. Mainly sagebrush flats, semi-desert shrublands, pinyon-juniper woodland. Digs its own burrow in loose soil or uses those of small mammals. Breeds in temporary or permanent water, including rain pools, pools in intermittent streams, and flooded areas along streams. Eggs are attached to vegetation in water or placed on bottom of pool.

Yes – 

Idaho Giant Salamander 

Dicamptodon aterrimus BLM sensitive SGCN / Idaho

Known to occur up to 2160 m in elevation. Transformed adults, although seldom seen, inhabit moist coniferous forests where they may be found under logs, bark, or rocks. They are most active on warm, rainy nights. Larvae are usually found in swift, cold mountain streams, but

may occasionally be found in lakes or ponds.

No – 

Westslope Cutthroat Trout Oncorhynchus clarki lewisi FS sensitive (R4) BLM sensitive SGCN / Idaho

Westslope cutthroat are common in both headwaters lake and stream environments. The newborn fry frequently migrate back to lakes to rear after 1 to 2 years in their native stream. Spawning and rearing streams tend to be cold and nutrient poor. Westslope cutthroat trout seek out gravel substrate in riffles and pool crests for spawning habitat. Westslope cutthroat trout also require cold water. Westslope cutthroat trout tend to thrive in streams with more pool habitat and cover than uniform, simple habitat. Juvenile cutthroat trout overwinter in the interstitial spaces of large stream substrate. Adult cutthroat trout need deep, slow moving pools that do not fill with anchor ice in order to survive the winter.

Yellowstone Cutthroat Trout 

Oncorhynchus clarki bouvieri BLM sensitive

MIS (Sawtooth NF)

SGCN / Idaho

Fish cont.

Bufo boreas boreas SGCN / Wyoming 

Yellowstone, Bighorn, and Snake River drainage, small mountain streams and large rivers (including Raft River, Goose Creek, Piney Creek, and Trout Creek) 

Boreal Toad (Northern Rocky Mountain population)

Pond margins, wet meadows, riparian areas. Boreal toads live in a wide range of habitats in western North America: wetlands, forests, woodlands, sagebrush, meadows, and floodplains in the mountains and valleys. Boreal toads generally occur between 7,500 and 12,000 feet in Region 2. The wetland habitat classification system of Cowardin et al. (1979) defines the following wetland classes: aquatic bed, streambed, rocky shore, unconsolidated shore, emergent wetland (persistent and non-persistent), scrub-shrub wetland, and forested wetland. Boreal toads are likely to be found within these classes in Riverine, Lacustrine, and Palustrine wetland systems.

Storeria occipitomaculata pahasapae

No – In 

SGCN / Wyoming This species inhabits mountainous or hilly woodlands in the Black Hills. It is commonly found under rocks and logs in moist areas. 

AmphibiansBlack Hills Redbelly Snake FS sensitive (R2)

Table D.11-2 Page 9 of 11

Gateway West Transmission Line Final EIS
Common Name Scientific Name Federal Agency Status 

State Species of 

Greatest 

Conservation Need 

(SGCN) / State 

Listed in Habitat Description

Does 

Table D.11-2. BLM Sensitive, Forest Service Sensitive, or MIS with the Potential to Occur within the Analysis Area

Mountain YellowLegged Frog Rana muscosa FS sensitive (R4) - Found in wetland habitats within mountain areas of California and Nevada. 

Northern Leopard Frog Rana pipiens

FS sensitive (R2)

BLM sensitive

SGCN / Wyoming

SGCN / Idaho

Beaver ponds, permanent water in plains and foothills. Springs, slow streams, marshes, bogs, ponds, canals, flood plains, reservoirs, and lakes; usually permanent water with rooted aquatic vegetation. In summer, commonly inhabits wet meadows and fields. Takes cover underwater, in damp niches, or in caves when inactive. Overwinters usually underwater.

Plains Leopard Frog Lithobates blairi FS sensitive (R2) - This species inhabits large waterbodies and streams, but will breed in smaller wetlands. No – T

Yosemite Toad Bufo canorus FS sensitive (R4) - Found in wetland habitats within California. 

FS sensitive (R2, R4) SGCN / Wyoming

Wood Frog Lithobates sylvatica FS sensitive (R2) - This species inhabits wetlands habitats as well as adjoining grassy meadows, willow bogs, coniferous forests, and aspen groves in their western range. In the eastern range they inhabit both closed canopy deciduous and coniferous forests. No – T

SGCN / Wyoming

Bruneau Dunes Tiger Beetle 

Cicindela waynei waynei BLM sensitive SGCN / Idaho

This species primarily occurs in the sparsely vegetated margins of sand dunes. Adults can be found on dunes but spend much of their time on more stabilized substrate in saddles between dunes. Larvae develop in burrows in flat areas in the narrow area between the drifting sand of the dunes and the established desert plant community. Such sites usually having a covering of small gravel or pebbles.

Yes 

Blind Cave Leiodid Beetle 

Glacicavicola bathyscoides BLM sensitive SGCN / Idaho This species is known only from southern Idaho and westernmost Wyoming. This species has only been found in lava tube caves in the vicinity of permanent ice 

SGCN / Wyoming

Columbia Pebblesnail Flumincola fuscus BLM sensitive -

The Columbia pebblesnail is found in the Snake River below Lower Salmon Falls Dam and in the tailwaters of the Bliss Dam. The pebblesnail lives in flowing waters and uses gravel- to boulder-sized substrate at the edges or downstream of rapids and whitewater areas. 

Yes 

Cooper's Rocky Mountain Snail

Oreohelix strigosa cooperi FS sensitive (R2) SGCN / Wyoming This species is found in moist forest habitats. No 

Dark Blue Euphilotes ancilla 

purpura FS sensitive (R4) - This butterfly is endemic to the Spring Mountains of Clark County Nevada. It inhabits stream banks, springs and seeps; primarily in mixed conifer and juniper areas. No – T

Hudsonian Emerald

Somatochlora hudsonica FS sensitive (R2) - This species inhabits wetland habitats which contain shallow, organic soils over dolomitic bedrock; calcareous water from intermittent seeps; or shallow small channels and/or sheet-flow

Unlike

Mora

Fo

Na

California Floater 

Ranus pretiosa (lutieventris)

BLM sensitive SGCN / Idaho

Ponds, sloughs, small streams. Columbia Spotted Frogs are fairly aquatic and are generally found in or near permanent bodies of water 

such as lakes, ponds, sluggish streams and marshes. The littoral zone is generally comprised of emergent vegetation including grasses and sedges. During the summer these frogs can be found some distance from the breeding sites but still associated with moist vegetation. Found from sea level to about 9,842 feet, usually in hilly areas near cool, permanent, quiet water in streams, rivers, lakes, pools, springs, and marshes. Highly aquatic, but may disperse into forests, grasslands, and brushlands. In the Northwest, prefers areas with thick algae and emergent vegetation, but may use sunken, dead, or decaying vegetation as escape cover.

Yes – 

Inhabits a wide variety of habitats - irrigation ditches, temporary pools, backyards, grassland, sagebrush flats, woods, desert streams, farms, river floodplains. Prefers sandy areas. From below sea level to 8,500 ft. (2600 m.)

Yes 

Yes – 

Bufo woodhousii

SGCN / Idaho

Anodonta californiensis SGCN / Idaho BLM sensitive

Invertebrates

The California floater, a freshwater mussel, is found in the Snake River in scattered locations between Bliss and Alkali Creek. The California floater prefers habitats immediately upstream or downstream of rapids in mud-sand substrates with good water quality.

BLM sensitive 

Woodhouse Toad Amphibians cont.

Spotted Frog

Table D.11-2 Page 10 of 11

Gateway West Transmission Line Final EIS
Common Name Scientific Name Federal Agency Status 

State Species of 

Greatest 

Conservation Need 

(SGCN) / State 

Listed in Habitat Description

Does 

Table D.11-2. BLM Sensitive, Forest Service Sensitive, or MIS with the Potential to Occur within the Analysis Area

Morand's Checkerspot

Euphydryas anicia morandi FS sensitive (R4) - This butterfly is endemic to the Spring Mountains of Clark County Nevada. There are small populations in the Lee Canyon ski areas. It inhabits meadows and avalanche chutes. No – T

Mt. Charleston Blue Butterfly

Icarcia shasta charlestonesis FS sensitive (R4) - This butterfly is endemic to the Spring Mountains of Clark County Nevada. It occurs on relatively flat ridglines in the Spring Mountains; typicaly above 8,200 feet. No – T

Nokomis Fritillary Butterfly (Silverspot butterfly)

Speyeria nokomis nokomis FS sensitive (R2) - This species of butterfly inhabits spring-fed meadows, seeps, marshes, and boggy streamside meadows associated with flowing water. No – T

Ottoe skipper Hesperia ottoe FS sensitive (R2) - This butterfly is a prairie obligate species that can be found in dry-mesic to mesic prairies. No – T

a

Pygmy mountain Snail Oreohelix pygmaea FS sensitive (R2) SGCN / Wyoming This species inhabits moist forest habitats.

No – 

Canyo

Regal Fritillary Speyeria idalia FS sensitive (R2) - This species inhabits tallgrass prairie, wet meadows, and marshy habitats. No – T

a

Rocky Mountain capshell

Acroloxus coloradensis FS sensitive (R2) - This species inhabits lakes with high calcium content and low elevations (approximately 2,864 m). No – T

St. Anthony Sand Dunes Tiger Beetle 

Cicindela arenicola BLM sensitive SGCN / Idaho This species is found on sand dunes. Larvae live in burrows located in flat, grassy areas where the sand is at least a meter thick, often on the windward side of sand dunes. Yes – 

Shortface Lanx Fisherola nuttalli BLM sensitive SGCN / Idaho Shortface lanx inhabits cold, unpolluted, medium to large streams with fast-flowing, well-oxygenated water and cobbleboulder substrate, and is generally found at the edges of rapids. Current populations occur in the Snake River. 

Spring Mountain Checkerspot

Chlosyne acastus robusta FS sensitive (R4) - This butterfly is endemic to the Spring Mountains of Clark County Nevada. It can be found in Kyle Canyon and Deer Creek. It occur primarily in riparian areas. No – T

Susan's Pursemaking Caddisfly Ochrotrichia susanae FS sensitive (R2) - The larva of this species are aquatic and inhabit small, cold streams that are well-oxygenated, highly buffered, and low in trace metals. Adults are weak flyers and tend to remain close to larva habitat. No 

Notes: BLM = Bureau of Land Management; FS = U.S. Forest Service; R2 = Forest Service Region 2; R4 = Forest Service Region 4.

Invertebrates cont.

Table D.11-2 Page 11 of 11

Gateway West Transmission Line Final EIS
Table D.11-3. Miles of Habitat Crossed for Federal ESA Wildlife Species with Available Quantitative Data

Black-Footed 

Ferret Canada Lynx 

Columbia Spotted 

Frog

Greater S

Grous

1W(a) Proposed – Total Length 73.8 1.9 45.7 Proposed – Comparison portion for Alternative 1W(a)-B 16.5 7.2 Alternative 1W(a)-B 20.9 9.2 1W(c) Proposed – Total Length 73.6 4.3 44.4 Proposed – Total Length 91.9 t1/ 85.2 

Proposed – Comparison portion for Alternative 2A 16.8 14.3 

Alternative 2A 16.0 12.9 Proposed – Comparison portion for Alternative 2B 12.5 10.3 

Alternative 2B 12.2 9.0 

Segment 3 Proposed – Total Length 45.9 36.2 Segment 3A Proposed – Total Length 5.1 4.4 

Proposed – Total Length 197.6 2.3 144.

Proposed – Comparison portion for Alternatives 4B-4F 85.2 2.3 69.1 Alternative 4B 100.2 1.3 85.3 

Alternative 4C 101.6 0.7 83.2 

Alternative 4D 100.8 1.2 84.9 

Alternative 4E 102.2 0.6 82.8 

Alternative 4F 87.5 4.5 1.8 69.1 Proposed – Total Length 55.7 27.7Proposed – Comparison portion for Alternatives 5A,B 22.3 9.6

Alternative 5A 29.7 14.4 

Alternative 5B 40.4 17.4 Proposed – Comparison portion for Alternative 5C 32.9 16.0

Alternative 5C 26.0 12.7 

Proposed – Comparison portion for Alternative 5D 19.2 10.3

Alternative 5D 17.0 5.6 

Proposed – Comparison portion for Alternative 5E 5.8 1.7

Alternative 5E 5.3 0.9

6 Proposed – Total Length 0.5 0.5

Notes: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero miles or null value

1/ "t" indicates only a trace amount (<0.1 mile) crossed2/ Alternative 4G was added in late 2012 and was therefore not added to this table

5

Segment 

Number

3

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B

Segment Length 

(Miles)

Miles of Habitat Cr

Proposed or Alternative Name

2

1W

42/

Table D.11-3 Page 1 of 2

Gateway West Transmission Line Final EIS
Table D.11-3. Miles of Habitat Crossed for Federal ESA Wildlife Species with Available Quantitative Data cont.

Black-Footed 

Ferret Canada Lynx 

Columbia Spotted 

Frog

Greater S

Grous

Proposed – Total Length 118.2 44.3Proposed – Comparison portion for Alternatives 7A,B 35.1 11.8Alternative 7A 37.7 17.2 

Alternative 7B 46.2 22.7

Proposed – Comparison portion for Alternative 7C 20.1 7.6

Alternative 7C 20.3 6.0Proposed – Comparison portion for Alternative 7D 6.2 3.1Alternative 7D 6.8 2.6Proposed – Comparison portion for Alternative 7E 3.8 3.2Alternative 7E 4.5 3.9Proposed – Comparison portion for Alternative 7F 10.5 7.5Alternative 7F 10.8 8.4Proposed – Comparison portion for Alternative 7G 3.3 2.5Alternative 7G 3.4 0.4Proposed – Comparison portion for Alternative 7K 118.2 44.3Alternative 7K 148.1 80.4

Proposed – Total Length 131.5 t1/ 74.8

Proposed – Comparison portion for Alternative 8A 51.9 31.4Alternative 8A 53.6 25.6Proposed – Comparison portion for Alternative 8B 45.3 t1/ 22.2Alternative 8B 45.8 0.2 16.9 

Proposed – Comparison portion for Alternative 8C 6.5 3.6

Alternative 8C 6.4 3.2

Proposed – Comparison portion for Alternative 8D 6.9 2.7

Alternative 8D 8.1 2.3

Proposed – Comparison portion for Alternative 8E 7.0 2.8

Alternative 8E 18.3 t1/ 9.6

Proposed – Total Length 162.2 0.6 103.4 Proposed – Comparison portion for Alternative 9A 7.8 3.7Alternative 9A 7.7 5.1Proposed – Comparison portion for Alternative 9B 49.1 t1/ 39.0

Alternative 9B 52.3 22.6Proposed – Comparison portion for Alternative 9C 14.4 13.4Alternative 9C 14.4 8.80Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 0.6 29.7Alternative 9D 60.1 0.1 29.6Alternative 9F 63.3 0.4 30.1Alternative 9G 57.8 0.2 29.6Alternative 9H 61.0 0.5 30.1Proposed – Comparison portion for Alternative 9E (revised) 61.4 0.6 33.1Alternative 9E (revised) 70.6 0.2 50.4

10 Proposed – Total Length 34.4 5.9

Notes: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero miles or null value

1/ "t" indicates only a trace amount (<0.1 mile) crossed

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B

987

Segment 

Number

Miles of Habitat Cr

Proposed or Alternative Name

Segment Length 

(Miles)

Table D.11-3 Page 2 of 2

Gateway West Transmission Line Final EIS
Table D.11-4. Miles of Habitat Crossed for BLM and Forest Service Sensitive Species with Available Quantitative Data

1W(a) Proposed – Total Length 73.8 2.0 6.6 2.6 12.3 50.8 47.0 Proposed – Comparison portion for Alternative 1W(a)-B 16.5 2.0 6.6 1.7 10.7 14.4 11.6 Alternative 1W(a)-B 20.9 2.0 1.6 20.5 17.6 12.7 1W(c) Proposed – Total Length 73.6 1.9 6.8 3.0 9.9 51.3 45.5 Proposed – Total Length 91.9 62.4 56.0 Proposed – Comparison portion for Alternative 2A 16.8 8.6 8.8 

Alternative 2A 16.0 1.9 10.1 12.2 Proposed – Comparison portion for Alternative 2B 12.5 5.3 6.4 Alternative 2B 12.2 2.0 6.2 9.8 Segment 3 Proposed – Total Length 45.9 28.9 38.5 Segment 3A Proposed – Total Length 5.1 3.1 4.0 Proposed – Total Length 197.6 4.2 99.2 57.8 69.6 Proposed – Comparison portion for Alternatives 4B-4F 85.2 48.7 6.5 36.4 Alternative 4B 100.2 69.2 8.2 39.4 Alternative 4C 101.6 75.0 8.2 39.4 Alternative 4D 100.8 66.2 8.2 39.4 Alternative 4E 102.2 72.0 8.2 39.4 Alternative 4F 87.5 52.3 6.5 36.4 Proposed – Total Length 55.7 1.6 t2/ 21.7 51.4 

Proposed – Comparison portion for Alternatives 5A,B 22.3 8.4 21.9 

Alternative 5A 29.7 14.0 29.7 

Alternative 5B 40.4 22.8 39.5 Proposed – Comparison portion for Alternative 5C 32.9 10.9 32.4 Alternative 5C 26.0 14.8 25.8 Proposed – Comparison portion for Alternative 5D 19.2 1.6 t2/ 6.0 17.2 

Alternative 5D 17.0 1.7 t2/ 8.3 15.5 Proposed – Comparison portion for Alternative 5E 5.8 1.6 t2/ 2.9 3.9 Alternative 5E 5.3 t2/ 0.9 1.7 

6 Proposed – Total Length 0.5 0.4 0.2 

Notes: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero miles or null value

1/ The number of “colony” miles crossed represents colonies that are not part of complexes; the sum of the two numbers, “colonies” and “complexes,” adds up to total miles of prairie dog habitat crossed.2/ "t" indicates only a trace amount (<0.1 mile) crossed3/ Alternative 4G was added in late 2012 and was therefore not added to this table

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), 

2

1W

43/

35

Segment 

Number Proposed or Alternative Name

Segment 

Length 

(Miles)

Miles of Habitat Crosse

Within a 1-

mile Nest 

Buffer

Within a 1-

mile Winter 

Roost Buffer Colony Complex1/

Bald Eagle Black-Tailed Prairie Dog

Burrowing 

Owl

Columbian 

Sharp-Tailed 

Grouse

Mounta

Plove

Table D.11-4 Page 1 of 2

Gateway West Transmission Line Final EIS
Table D.11-4. Miles of Habitat Crossed for BLM and Forest Service Sensitive Species with Available Quantitative Data cont.

Proposed – Total Length 118.2 66.2 76.8 Proposed – Comparison portion for Alternatives 7A,B 35.1 15.9 35.0 Alternative 7A 37.7 18.8 37.0 Alternative 7B 46.2 26.0 46.0 

Proposed – Comparison portion for Alternative 7C 20.1 15.0 15.9 

Alternative 7C 20.3 17.5 19.1 

Proposed – Comparison portion for Alternative 7D 6.2 4.4 1.1 

Alternative 7D 6.8 4.9 2.1 Proposed – Comparison portion for Alternative 7E 3.8 1.7 

Alternative 7E 4.5 1.0 

Proposed – Comparison portion for Alternative 7F 10.5 5.0 

Alternative 7F 10.8 3.8 

Proposed – Comparison portion for Alternative 7G 3.3 1.8 2.8 

Alternative 7G 3.4 2.2 2.6 Proposed – Comparison portion for Alternative 7K 118.2 66.2 76.8 Alternative 7K 148.1 75.8 95.1 Proposed – Total Length 131.5 111.1 Proposed – Comparison portion for Alternative 8A 51.9 37.0 Alternative 8A 53.6 t2/ 36.2 

Proposed – Comparison portion for Alternative 8B 45.3 41.4 Alternative 8B 45.8 28.8 

Proposed – Comparison portion for Alternative 8C 6.5 6.4 

Alternative 8C 6.4 6.2 

Proposed – Comparison portion for Alternative 8D 6.9 6.9 

Alternative 8D 8.1 6.6 

Proposed – Comparison portion for Alternative 8E 7.0 5.3 Alternative 8E 18.3 t2/ 16.6 

Proposed – Total Length 162.2 131.6 1.8 

Proposed – Comparison portion for Alternative 9A 7.8 7.6 

Alternative 9A 7.7 7.0 

Proposed – Comparison portion for Alternative 9B 49.1 46.3 Alternative 9B 52.3 40.6 

Proposed – Comparison portion for Alternative 9C 14.4 13.0 

Alternative 9C 14.4 13.4 Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 40.3 

Alternative 9D 60.1 t2/ 52.6 

Alternative 9F 63.3 t2/ 50.7 Alternative 9G 57.8 t2/ 51.6 Alternative 9H 61.0 t2/ 49.8 Proposed – Comparison portion for Alternative 9E (revised) 61.4 43.2 Alternative 9E (revised) 70.6 58.4 

10 Proposed – Total Length 34.4 t2/ 17.0 

Notes: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero miles or null value

1/ The number of “colony” miles crossed represents colonies that are not part of complexes; the sum of the two numbers, “colonies” and “complexes,” adds up to total miles of prairie dog habitat crossed.2/ "t" indicates only a trace amount (<0.1 mile) crossed

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), 

78

Segment 

Number

9

Burrowing 

Owl

Within a 1-

mile Nest 

Buffer

Within a 1-

mile Winter 

Roost Buffer

Miles of Habitat Crosse

Mounta

Plove

Columbian 

Sharp-Tailed 

Grouse

Proposed or Alternative Name 

Colony Complex 

1/

Segment 

Length 

(Miles)

Bald Eagle Black-Tailed Prairie Dog

Table D.11-4 Page 2 of 2

Gateway West Transmission Line Final EIS
Table D.11-5. Acres of Construction Impacts to Federal ESA Wildlife Species with Available Quantitative Data

Black-Footed Ferret Canada Lynx Columbia Spotted Frog

1W(a) Proposed – Total Length 73.8 21 Proposed – Comparison portion for Alternative 1W(a)-B 16.5 

Alternative 1W(a)-B 20.9 

1W(c) Proposed – Total Length 73.6 57 Proposed – Total Length 91.9 22 Proposed – Comparison portion for Alternative 2A 16.8 

Alternative 2A 16.0 Proposed – Comparison portion for Alternative 2B 12.5 Alternative 2B 12.2 Segment 3 Proposed – Total Length 45.9 Segment 3A Proposed – Total Length 5.1 Proposed – Total Length 197.6 54 Proposed – Comparison portion for Alternatives 4B-4F 85.2 53 Alternative 4B 100.2 34 Alternative 4C 101.6 30 Alternative 4D 100.8 34 Alternative 4E 102.2 30 Alternative 4F 87.5 139 35 Proposed – Total Length 55.7 Proposed – Comparison portion for Alternatives 5A,B 22.3 Alternative 5A 29.7 Alternative 5B 40.4 Proposed – Comparison portion for Alternative 5C 32.9 Alternative 5C 26.0 Proposed – Comparison portion for Alternative 5D 19.2 Alternative 5D 17.0 Proposed – Comparison portion for Alternative 5E 5.8 Alternative 5E 5.3 

6 Proposed – Total Length 0.5 

Notes: Blank cells indicate zero acres or null value

1/ "t" indicates only a trace amount (<0.1 acre) of impact2/ Alternative 4G was added in late 2012 and was therefore not added to this table

42/

Acres of Constr

5

Segment 

Number Proposed or Alternative Name

Segment Length 

(Miles)

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B

1W

32

Table D.11-5 Page 1 of 2

Gateway West Transmission Line Final EIS
Table D.11-5. Acres of Construction Impacts to Federal ESA Wildlife Species with Available Quantitative Data cont.

Black-Footed Ferret Canada Lynx Columbia Spotted Frog

Proposed – Total Length 118.2 Proposed – Comparison portion for Alternatives 7A,B 35.1 

Alternative 7A 37.7 

Alternative 7B 46.2 

Proposed – Comparison portion for Alternative 7C 20.1 

Alternative 7C 20.3 

Proposed – Comparison portion for Alternative 7D 6.2 

Alternative 7D 6.8 Proposed – Comparison portion for Alternative 7E 3.8 

Alternative 7E 4.5 

Proposed – Comparison portion for Alternative 7F 10.5 Alternative 7F 10.8 Proposed – Comparison portion for Alternative 7G 3.3 Alternative 7G 3.4 Proposed – Comparison portion for Alternative 7K 118.2 Alternative 7K 148.1 

Proposed – Total Length 131.5 <1 

Proposed – Comparison portion for Alternative 8A 51.9 

Alternative 8A 53.6 Proposed – Comparison portion for Alternative 8B 45.3 <1 

Alternative 8B 45.8 7 

Proposed – Comparison portion for Alternative 8C 6.5 

Alternative 8C 6.4 

Proposed – Comparison portion for Alternative 8D 6.9 

Alternative 8D 8.1 

Proposed – Comparison portion for Alternative 8E 7.0 Alternative 8E 18.3 <1 

Proposed – Total Length 162.2 7 

Proposed – Comparison portion for Alternative 9A 7.8 

Alternative 9A 7.7 

Proposed – Comparison portion for Alternative 9B 49.1 t1/ 

Alternative 9B 52.3 Proposed – Comparison portion for Alternative 9C 14.4 Alternative 9C 14.4 Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 6 Alternative 9D 60.1 <1 Alternative 9F 63.3 5 Alternative 9G 57.8 1 

Alternative 9H 61.0 6 Proposed – Comparison portion for Alternative 9E (revised) 61.4 6 

Alternative 9E (revised) 70.6 3 

10 Proposed – Total Length 34.4 

Notes: Blank cells indicate zero acres or null value

1/ "t" indicates only a trace amount (<0.1 acre) of impact

7

Acres of Constr

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7BNotes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

Segment 

Number Proposed or Alternative Name

Segment Length 

(Miles)

98

Table D.11-5 Page 2 of 2

Gateway West Transmission Line Final EIS
Table D.11-6. Acres of Construction Impacts to BLM and Forest Service Sensitive Species with Available Quantitative Data

Within a 1-

mile Nest 

Buffer

Within a 1-

mile Winter 

Roost Buffer Colony Complex1/

1W(a) Proposed – Total Length 73.8 12 59 23 122 514 494 Proposed – Comparison portion for Alternative 1W(a)-B 16.5 12 59 17 99 125 101 Alternative 1W(a)-B 20.9 29 22 269 236 176 1W(c) Proposed – Total Length 73.6 20 76 34 159 703 700 Proposed – Total Length 91.9 1 1,351 1,254 Proposed – Comparison portion for Alternative 2A 16.8 1 202 194 

Alternative 2A 16.0 43 239 273 Proposed – Comparison portion for Alternative 2B 12.5 1 147 154 Alternative 2B 12.2 42 131 166 Segment 3 Proposed – Total Length 45.9 525 719 Segment 3A Proposed – Total Length 5.1 34 43 Proposed – Total Length 197.6 77 2,079 1,123 1,421 Proposed – Comparison portion for Alternatives 4B-4F 85.2 <1 949 114 701 Alternative 4B 100.2 1,451 176 812 Alternative 4C 101.6 1,525 162 812 Alternative 4D 100.8 1,408 176 814 Alternative 4E 102.2 1,465 158 814 Alternative 4F 87.5 <1 979 123 701 Proposed –Total Length 55.7 31 521 1,075 Proposed – Comparison portion for Alternatives 5A,B 22.3 194 455 Alternative 5A 29.7 309 634 Alternative 5B 40.4 486 830 Proposed – Comparison portion for Alternative 5C 32.9 272 719 Alternative 5C 26.0 316 504 Proposed – Comparison portion for Alternative 5D 19.2 31 177 415 Alternative 5D 17.0 25 211 367 Proposed – Comparison portion for Alternative 5E 5.8 31 92 112 Alternative 5E 5.3 2 61 84 

6 Proposed – Total Length 0.5 43 17 

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero acres or null value

1/ The number of “colony” acres impacted represents colonies that are not part of complexes; the sum of the two numbers, “colonies” and “complexes,” adds up to total acres of prairie dog habitat impacte2/ "t" indicates only a trace amount (<0.1 acre) of impact3/ Alternative 4G was added in late 2012 and was therefore not added to this table

1W

Black-Tailed Prairie Dog

Mountain 

Plover

5

Segment 

Number Proposed or Alternative Name

Segment 

Length 

(Miles)

Acres of Habitat Impacted by Cons

Bald Eagle

Burrowing 

Owl

Columbian 

Sharp-Tailed 

Grouse

23

43/

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G

Table D.11-6 Page 1 of 2

Gateway West Transmission Line Final EIS
Table D.11-6. Acres of Construction Impacts to BLM and Forest Service Sensitive Species with Available Quantitative Data cont.

Within a 1-

mile Nest 

Buffer

Within a 1-

mile Winter 

Roost Buffer Colony Complex1/

Proposed – Total Length 118.2 1,184 1,349 Proposed – Comparison portion for Alternatives 7A,B 35.1 285 639 Alternative 7A 37.7 386 756 Alternative 7B 46.2 537 909 Proposed – Comparison portion for Alternative 7C 20.1 276 285 Alternative 7C 20.3 313 333 Proposed – Comparison portion for Alternative 7D 6.2 77 28 Alternative 7D 6.8 96 47 Proposed – Comparison portion for Alternative 7E 3.8 28 

Alternative 7E 4.5 33 

Proposed – Comparison portion for Alternative 7F 10.5 106 Alternative 7F 10.8 105 Proposed – Comparison portion for Alternative 7G 3.3 37 51 

Alternative 7G 3.4 54 67 Proposed – Comparison portion for Alternative 7K 118.2 1,183 1,348 Alternative 7K 148.1 1,544 1,878 Proposed – Total Length 131.5 2,113 Proposed – Comparison portion for Alternative 8A 51.9 684 Alternative 8A 53.6 694 Proposed – Comparison portion for Alternative 8B 45.3 798 Alternative 8B 45.8 593 Proposed – Comparison portion for Alternative 8C 6.5 159 Alternative 8C 6.4 122 

Proposed – Comparison portion for Alternative 8D 6.9 141 Alternative 8D 8.1 148 Proposed – Comparison portion for Alternative 8E 7.0 99 

Alternative 8E 18.3 311 Proposed – Total Length 162.2 2,593 34 Proposed – Comparison portion for Alternative 9A 7.8 128 Alternative 9A 7.7 137 Proposed – Comparison portion for Alternative 9B 49.1 937 Alternative 9B 52.3 726 Proposed – Comparison portion for Alternative 9C 14.4 274 Alternative 9C 14.4 221 

Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 783 Alternative 9D 60.1 932 Alternative 9F 63.3 939 Alternative 9G 57.8 939 Alternative 9H 61.0 942 Proposed – Comparison portion for Alternative 9E (revised) 61.4 851 Alternative 9E (revised) 70.6 1,111 

10 Proposed – Total Length 34.4 319 

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero acres or null value

1/ The number of “colony” acres impacted represents colonies that are not part of complexes; the sum of the two numbers, “colonies” and “complexes,” adds up to total acres of prairie dog habitat impacte2/ "t" indicates only a trace amount (<0.1 acre) of impact

Segment 

Number Proposed or Alternative Name

Segment 

Length 

(Miles)

Mountain 

Plover

Acres of Habitat Impacted by Cons

Columbian 

Sharp-Tailed 

Grouse

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G

9

Bald Eagle Black-Tailed Prairie Dog

Burrowing 

Owl

87

Table D.11-6 Page 2 of 2

Gateway West Transmission Line Final EIS
Table D.11-7. Acres of Operations Impacts to Federal ESA Wildlife Species with Available Quantitative Data

Black-Footed Ferret Canada Lynx 

Columbia Spotted 

Frog

Greater 

Grou

1W(a) Proposed – Total Length 73.8 5 124 Proposed – Comparison portion for Alternative 1W(a)-B 16.5 11 Alternative 1W(a)-B 20.9 22 1W(c) Proposed – Total Length 73.6 5 84 Proposed –Total Length 91.9 7 228 Proposed – Comparison portion for Alternative 2A 16.8 24 Alternative 2A 16.0 33 Proposed – Comparison portion for Alternative 2B 12.5 17 Alternative 2B 12.2 15 Segment 3 Proposed – Total Length 45.9 124 Segment 3A Proposed – Total Length 5.1 8 Proposed –Total Length 197.6 4 420 Proposed – Comparison portion for Alternatives 4B-4F 85.2 4 179 Alternative 4B 100.2 2 232 Alternative 4C 101.6 2 224 Alternative 4D 100.8 2 234 Alternative 4E 102.2 2 222 Alternative 4F 87.5 77 2 176 Proposed – Total Length 55.7 99Proposed – Comparison portion for Alternatives 5A,B 22.3 26Alternative 5A 29.7 38 Alternative 5B 40.4 44 Proposed – Comparison portion for Alternative 5C 32.9 41Alternative 5C 26.0 29 Proposed – Comparison portion for Alternative 5D 19.2 35Alternative 5D 17.0 24 Proposed – Comparison portion for Alternative 5E 5.8 17Alternative 5E 5.3 17

6 Proposed – Total Length 0.5 39

Notes: Blank cells indicate zero acres or null value

1/ "t" indicates only a trace amount (<0.1 acre) of occupancy2/ Alternative 4G was added in late 2012 and was therefore not added to this table

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B

Proposed or Alternative Name

Segment Length 

(Miles)

Acres of Operation Im

2

42/

1W

Segment 

Number

35

Table D.11-7 Page 1 of 2

Gateway West Transmission Line Final EIS
Table D.11-7. Acres of Operations Impacts to Federal ESA Wildlife Species with Available Quantitative Data cont.

Black-Footed Ferret Canada Lynx 

Columbia Spotted 

Frog

Greater 

Grou

Proposed – Total Length 118.2 112 

Proposed – Comparison portion for Alternatives 7A,B 35.1 29 Alternative 7A 37.7 43 

Alternative 7B 46.2 50Proposed – Comparison portion for Alternative 7C 20.1 14Alternative 7C 20.3 8Proposed – Comparison portion for Alternative 7D 6.2 5 

Alternative 7D 6.8 5 Proposed – Comparison portion for Alternative 7E 3.8 4Alternative 7E 4.5 7Proposed – Comparison portion for Alternative 7F 10.5 13Alternative 7F 10.8 15Proposed – Comparison portion for Alternative 7G 3.3 3Alternative 7G 3.4 <1Proposed – Comparison portion for Alternative 7K 118.2 112 Alternative 7K 148.1 259 Proposed – Total Length 131.5 t1/ 150 Proposed – Comparison portion for Alternative 8A 51.9 71 Alternative 8A 53.6 60 Proposed – Comparison portion for Alternative 8B 45.3 t1/ 43

Alternative 8B 45.8 <1 34 Proposed – Comparison portion for Alternative 8C 6.5 9Alternative 8C 6.4 8Proposed – Comparison portion for Alternative 8D 6.9 5Alternative 8D 8.1 4Proposed – Comparison portion for Alternative 8E 7.0 4Alternative 8E 18.3 14Proposed – Total Length 162.2 t1/ 210 

Proposed – Comparison portion for Alternative 9A 7.8 6Alternative 9A 7.7 9Proposed – Comparison portion for Alternative 9B 49.1 84Alternative 9B 52.3 38Proposed – Comparison portion for Alternative 9C 14.4 24Alternative 9C 14.4 13Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 1 54Alternative 9D 60.1 39 Alternative 9F 63.3 1 43 Alternative 9G 57.8 <1 41 Alternative 9H 61.0 1 45 Proposed – Comparison portion for Alternative 9E (revised) 61.4 1 61

Alternative 9E (revised) 70.6 <1 90

10 Proposed – Total Length 34.4 23

Notes: Blank cells indicate zero acres or null value

1/ "t" indicates only a trace amount (<0.1 acre) of occupancy

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7BNotes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

98

Acres of Operation Im

Proposed or Alternative Name

Segment Length 

(Miles)

7

Segment 

Number

Table D.11-7 Page 2 of 2

Gateway West Transmission Line Final EIS
Table D.11-8. Acres of Operations Impacts to BLM and Forest Service Sensitive Species with Available Quantitative Data

1W(a) Proposed – Total Length 73.8 2 11 4 23 107 Proposed – Comparison portion for Alternative 1W(a)-B 16.5 2 11 3 18 23 Alternative 1W(a)-B 20.9 7 4 43 37 

1W(c) Proposed – Total Length 73.6 2 9 4 15 84 Proposed – Total Length 91.9 <1 164 Proposed – Comparison portion for Alternative 2A 16.8 <1 16 Alternative 2A 16.0 5 24 Proposed – Comparison portion for Alternative 2B 12.5 <1 12 Alternative 2B 12.2 4 11 Segment 3 Proposed – Total Length 45.9 99 Segment 3A Proposed – Total Length 5.1 6 Proposed – Total Length 197.6 8 278 149 Proposed – Comparison portion for Alternatives 4B-4F 85.2 t2/ 114 12 

Alternative 4B 100.2 195 20 

Alternative 4C 101.6 197 19 

Alternative 4D 100.8 191 20 

Alternative 4E 102.2 190 18 

Alternative 4F 87.5 t2/ 118 13 

Proposed – Total Length 55.7 1 82 156 Proposed – Comparison portion for Alternatives 5A,B 22.3 21 57 

Alternative 5A 29.7 30 77 Alternative 5B 40.4 44 89 Proposed – Comparison portion for Alternative 5C 32.9 27 91 

Alternative 5C 26.0 32 54 Proposed – Comparison portion for Alternative 5D 19.2 1 26 56 

Alternative 5D 17.0 3 34 46 

Proposed – Comparison portion for Alternative 5E 5.8 1 18 18 

Alternative 5E 5.3 <1 16 17 

6 Proposed – Total Length 0.5 41 15 

Notes: Blank cells indicate zero acres or null value

2/ "t" indicates only a trace amount (<0.1 acre) of impact3/ Alternative 4G was added in late 2012 and was therefore not added to this table

Segment 

Number

1W

Bald Eagle

Within a 1-

mile Winter 

Roost Buffer

Black-Tailed Prairie Dog

Colony 

Burrowing 

Complex Owl 1/

43/

2

1/ The number of “colony” acres impacted represents colonies that are not part of complexes; the sum of the two numbers, “colonies” and “complexes,” adds up to total acres of prairie dog habitat im

Columbian 

Sharp-Tailed 

Grouse

Within a 1-

mile Nest 

Buffer

M

Proposed or Alternative Name 

5

Segment 

Length 

(Miles)

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

Acres of Habitat Impact

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, a

3

Table D.11-8 Page 1 of 2

Gateway West Transmission Line Final EIS
Table D.11-8. Acres of Operations Impacts to BLM and Forest Service Sensitive Species with Available Quantitative Data cont.

Proposed – Total Length 118.2 139 168 Proposed – Comparison portion for Alternatives 7A,B 35.1 25 68 Alternative 7A 37.7 37 89 Alternative 7B 46.2 46 94 Proposed – Comparison portion for Alternative 7C 20.1 29 30 

Alternative 7C 20.3 24 26 Proposed – Comparison portion for Alternative 7D 6.2 8 1 

Alternative 7D 6.8 10 3 Proposed – Comparison portion for Alternative 7E 3.8 2 

Alternative 7E 4.5 3 

Proposed – Comparison portion for Alternative 7F 10.5 11 

Alternative 7F 10.8 11 Proposed – Comparison portion for Alternative 7G 3.3 3 4 Alternative 7G 3.4 3 3 Proposed – Comparison portion for Alternative 7K 118.2 139 167 Alternative 7K 148.1 188 244 Proposed – Total Length 131.5 215 Proposed – Comparison portion for Alternative 8A 51.9 80 

Alternative 8A 53.6 80 

Proposed – Comparison portion for Alternative 8B 45.3 77 

Alternative 8B 45.8 54 

Proposed – Comparison portion for Alternative 8C 6.5 15 

Alternative 8C 6.4 15 Proposed – Comparison portion for Alternative 8D 6.9 13 Alternative 8D 8.1 12 Proposed – Comparison portion for Alternative 8E 7.0 8 Alternative 8E 18.3 24 Proposed – Total Length 162.2 291 3 Proposed – Comparison portion for Alternative 9A 7.8 13 Alternative 9A 7.7 13 Proposed – Comparison portion for Alternative 9B 49.1 115 

Alternative 9B 52.3 68 

Proposed – Comparison portion for Alternative 9C 14.4 23 

Alternative 9C 14.4 20 Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 76 

Alternative 9D 60.1 73 

Alternative 9F 63.3 75 

Alternative 9G 57.8 77 

Alternative 9H 61.0 79 

Proposed – Comparison portion for Alternative 9E (revised) 61.4 83 

Alternative 9E (revised) 70.6 114 

10 Proposed – Total Length 34.4 30 

Notes: Blank cells indicate zero acres or null value

2/ "t" indicates only a trace amount (<0.1 acre) of impact

Within a 1-

mile Nest 

Buffer

Black-Tailed Prairie Dog

Burrowing 

Owl

87

Complex1/

Acres of Habitat Impact

Proposed or Alternative Name

Within a 1-

mile Winter 

Roost Buffer

Columbian 

Sharp-Tailed 

Grouse

Bald Eagle

M

Segment 

Number

Segment 

Length 

(Miles)

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

1/ The number of “colony” acres impacted represents colonies that are not part of complexes; the sum of the two numbers, “colonies” and “complexes,” adds up to total acres of prairie dog habitat im

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, a

9

Colony 

Table D.11-8 Page 2 of 2

Gateway West Transmission Line Final EIS
Table D.11-9. Number of Greater Sage-Grouse Leks within Specified Distances from Route Centerlines

Occupied1/ Undetermined Occupied1/ Undetermined Occupied1/ Undetermined Occupied1/ Undet

1W(a) Proposed – Total Length 73.8 9(2) 

Proposed – Comparison portion for Alternative 1W(a)-B 16.5 3 

Alternative 1W(a)-B 20.9 1 2 1W(c) Proposed – Total Length 73.6 1 6(1) Proposed – Total Length 91.9 2(1) 5(3) 2(2) 15(7) 2Proposed – Comparison portion for Alternative 2A 16.8 1(1) 1Alternative 2A 16.0 1(1) 1Proposed – Comparison portion for Alternative 2B 12.5 1(1) Alternative 2B 12.2 1(1) Segment 3 Proposed – Total Length 45.9 1(1) Segment 3A Proposed – Total Length 5.1 Proposed – Total Length 197.6 2(2) 1(1) 6(4) 2(1) 14(8) 8Proposed – Comparison portion for Alternatives 4B-4F 85.2 2(2) 1(1) 5(3) 1(1) 12(7) 5Alternative 4B 100.2 1 3(2) 13(7) Alternative 4C 101.6 3(2) 17(9) Alternative 4D 100.8 1 2(1) 15(9) Alternative 4E 102.2 2(1) 19(11) Alternative 4F 87.5 2(2) 1(1) 7(5) 1(1) 12(8) 4Proposed – Total Length 55.7 1 1 1 1 Proposed – Comparison portion for Alternatives 5A,B 22.3 1 1 1 1 Alternative 5A 29.7 Alternative 5B 40.4 Proposed – Comparison portion for Alternative 5C 32.9 1 1 1 1 Alternative 5C 26.0 Proposed – Comparison portion for Alternative 5D 19.2 Alternative 5D 17.0 Proposed – Comparison portion for Alternative 5E 5.8Alternative 5E 5.3

6 Proposed – Total Length 0.5 

1/ Refers to leks that have been defined as occupied in Wyoming and Idaho, and all leks in Nevada and Utah2/ Alternative 4G was added in late 2012 and was therefore not added to this table

Segment 

Length 

(Miles)

5

0.25-mile Buffer

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), Proposed 8 

Buffer Distance and A

1W

Segment 

Number

Notes: The numbers in parentheses indicate the number of leks located on federally managed lands (e.g., a “4(2)” value indicates there are 4 leks within the buffer distance, 2 of which are located on federally managed 

23

0.6-mile Buffer

42/

1-mile Buffer 2-mile Buffe

Proposed or Alternative Name

Table D.11-9 Page 1 of 2

Gateway West Transmission Line Final EIS
Table D.11-9. Number of Greater Sage-Grouse Leks within Specified Distances from Route Centerlines cont.

Occupied1/ Undetermined Occupied1/ Undetermined Occupied1/ Undetermined Occupied1/ Undet

Proposed – Total Length 118.2 1 1 1 3(2) 2(1) 3

Proposed – Comparison portion for Alternatives 7A,B 35.1 1 1 1 

Alternative 7A 37.7 1 

Alternative 7B 46.2 1

Proposed – Comparison portion for Alternative 7C 20.1 1

Alternative 7C 20.3 2

Proposed – Comparison portion for Alternative 7D 6.2 

Alternative 7D 6.8 Proposed – Comparison portion for Alternative 7E 3.8 1(1) 1Alternative 7E 4.5 1(1) 2

Proposed – Comparison portion for Alternative 7F 10.5 1(1) 1

Alternative 7F 10.8 1(1) 1(1) 1(1) 2

Proposed – Comparison portion for Alternative 7G 3.3 1(1) Alternative 7G 3.4 1(1) Proposed – Comparison portion for Alternative 7K 118.2 1 1 1 3(2) 2(1) 3

Alternative 7K 148.1 4(4) 1(1) 7(7) 2(1) 17(13) 17

Proposed – Total Length 131.5 

Proposed – Comparison portion for Alternative 8A 51.9 

Alternative 8A 53.6 Proposed – Comparison portion for Alternative 8B 45.3 

Alternative 8B 45.8 Proposed – Comparison portion for Alternative 8C 6.5 

Alternative 8C 6.4 Proposed – Comparison portion for Alternative 8D 6.9Alternative 8D 8.1Proposed – Comparison portion for Alternative 8E 7.0 

Alternative 8E 18.3 Proposed – Total Length 162.2 1(1) 1(1) 1(1) 2

Proposed – Comparison portion for Alternative 9A 7.8 Alternative 9A 7.7 

Proposed – Comparison portion for Alternative 9B 49.1 1(1) Alternative 9B 52.3 Proposed – Comparison portion for Alternative 9C 14.4 1(1) Alternative 9C 14.4 

Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 1(1) 1(1) 1Alternative 9D 60.1 

Alternative 9F 63.3 Alternative 9G 57.8 Alternative 9H 61.0 

Proposed – Comparison portion for Alternative 9E (revised) 61.4 1(1) 1(1) 1Alternative 9E (revised) 70.6 1

10 Proposed – Total Length 34.4 1(1) 2(1) 3(2) 5

1 1(1) 4(3) 5(3) 10(6) 11(8) 22(13) 20

1/ Refers to leks that have been defined as occupied in Wyoming and Idaho, and all leks in Nevada and Utah

Notes: The numbers in parentheses indicate the number of leks located on federally managed lands (e.g., a “4(2)” value indicates there are 4 leks within the buffer distance, 2 of which are located on federally managed 

9

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), Proposed 8 

8

Segment 0.25-mile Buffer 

Number

Segment 

Length 

(Miles)

Grand Total for the Proposed Routes

Buffer Distance and A

0.6-mile Buffer 1-mile Buffer 

7

2-mile Buffe

Proposed or Alternative Name

Table D.11-9 Page 2 of 2

Gateway West Transmission Line Final EIS
Table D.11-10. Number of Columbian Sharp-Tailed Grouse Leks within Specified Distances from Route Centerlines

Occupied1/ Undetermined Occupied1/ 

1W(a) Proposed – Total Length 73.8Proposed – Comparison portion for Alternative 1W(a)-B 16.5Alternative 1W(a)-B 20.91W(c) Proposed – Total Length 73.6Proposed – Total Length 91.9Proposed – Comparison portion for Alternative 2A 16.8Alternative 2A 16.0Proposed – Comparison portion for Alternative 2B 12.5Alternative 2B 12.2Segment 3 Proposed – Total Length 45.9Segment 3A Proposed – Total Length 5.1Proposed – Total Length 197.6 2 3 Proposed – Comparison portion for Alternatives 4B-4F 85.2Alternative 4B 100.2Alternative 4C 101.6Alternative 4D 100.8Alternative 4E 102.2Alternative 4F 87.5Proposed – Total Length 55.7 1 4 Proposed – Comparison portion for Alternatives 5A,B 22.3 1 3 Alternative 5A 29.7 2 5 Alternative 5B 40.4 1 3 Proposed – Comparison portion for Alternative 5C 32.9 1 4 Alternative 5C 26.0 1 Proposed – Comparison portion for Alternative 5D 19.2 1 Alternative 5D 17.0 1 1 Proposed – Comparison portion for Alternative 5E 5.8 Alternative 5E 5.3 

6 Proposed – Total Length 0.5

1/ Refers to leks that have been defined as occupied in Wyoming and Idaho, and all leks in Nevada2/ Alternative 4G was added in late 2012 and was therefore not added to this table

35

1W

Segment Length (Miles)

0.25-mile Buffer 0.6-m

Note: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 

Buffer Distance a

2

42/

Segment 

Number Proposed or Alternative Name

Table D.11-10 Page 1 of 2

Gateway West Transmission Line Final EIS
Table D.11-10. Number of Columbian Sharp-Tailed Grouse Leks within Specified Distances from Route Centerlines cont.

Occupied1/ Undetermined Occupied1/ 

Proposed – Total Length 118.2 1 4 Proposed – Comparison portion for Alternatives 7A,B 35.1 1 3 Alternative 7A 37.7 1 3 Alternative 7B 46.2 1 Proposed – Comparison portion for Alternative 7C 20.1 1 Alternative 7C 20.3 1 1 Proposed – Comparison portion for Alternative 7D 6.2Alternative 7D 6.8Proposed – Comparison portion for Alternative 7E 3.8Alternative 7E 4.5Proposed – Comparison portion for Alternative 7F 10.5Alternative 7F 10.8Proposed – Comparison portion for Alternative 7G 3.3Alternative 7G 3.4Proposed – Comparison portion for Alternative 7K 118.2 1 4 Alternative 7K 148.1 1 3 Proposed – Total Length 131.5Proposed – Comparison portion for Alternative 8A 51.9Alternative 8A 53.6Proposed – Comparison portion for Alternative 8B 45.3Alternative 8B 45.8Proposed – Comparison portion for Alternative 8C 6.5Alternative 8C 6.4Proposed – Comparison portion for Alternative 8D 6.9Alternative 8D 8.1Proposed – Comparison portion for Alternative 8E 7.0Alternative 8E 18.3Proposed – Total Length 162.2Proposed – Comparison portion for Alternative 9A 7.8Alternative 9A 7.7Proposed – Comparison portion for Alternative 9B 49.1Alternative 9B 52.3Proposed – Comparison portion for Alternative 9C 14.4Alternative 9C 14.4Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2Alternative 9D 60.1Alternative 9F 63.3Alternative 9G 57.8Alternative 9H 61.0Proposed – Comparison portion for Alternative 9E (revised) 61.4Alternative 9E (revised) 70.6

10 Proposed – Total Length 34.4

1/ Refers to leks that have been defined as occupied in Wyoming and Idaho, and all leks in Nevada

0.6-m

Segment Length (Miles)

Segment 

Number

9

0.25-mile Buffer

Buffer Distance a

87

Note: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 

Proposed or Alternative Name

Table D.11-10 Page 2 of 2

Gateway West Transmission Line Final EIS
Table D.11-11. Miles of Agency Designated Greater Sage-Grouse Habitat Crossed by the Route Centerlines

Segment 

Number Proposed or Alternative Name

Segment Length 

(Miles)

Core Areas 

Crossed Key Areas Crossed

R1 Habitats 

Crossed

R2 Hab

Cros

1W(a) Proposed – Total Length 73.8 25.8

Proposed – Comparison portion for Alternative 1W(a)-B 16.5 0.9Alternative 1W(a)-B 20.9 9.11W(c) Proposed – Total Length 73.6 24.8

Proposed – Total Length 91.9 40.9

Proposed – Comparison portion for Alternative 2A 16.8 4.0Alternative 2A 16.0 4.5

Proposed – Comparison portion for Alternative 2B 12.5Alternative 2B 12.2Segment 3 Proposed – Total Length 45.9Segment 3A Proposed – Total Length 5.1Proposed – Total Length 197.6 40.2 14.6 

Proposed – Comparison portion for Alternatives 4B-4F 85.2 28.4 2.6 Alternative 4B 100.2 44.0 4.9 0.3 Alternative 4C 101.6 56.4 4.9 0.3 Alternative 4D 100.8 44.6 4.9 0.3 Alternative 4E 102.2 57.0 4.9 0.3 Alternative 4F 87.5 27.0 2.6 

Proposed – Total Length 55.7Proposed – Comparison portion for Alternatives 5A,B 22.3Alternative 5A 29.7 2.9 Alternative 5B 40.4 9.1 0.8 Proposed – Comparison portion for Alternative 5C 32.9Alternative 5C 26.0Proposed – Comparison portion for Alternative 5D 19.2Alternative 5D 17.0Proposed – Comparison portion for Alternative 5E 5.8Alternative 5E 5.3

6 Proposed – Total Length 0.5 0.3 

Notes: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero miles or null value

1/ Alternative 4G was added in late 2012 and was therefore not added to this table

5

1W

2

41/

3

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7

Table D.11-11 Page 1 of 2

Gateway West Transmission Line Final EIS
Table D.11-11. Miles of Agency Designated Greater Sage-Grouse Habitat Crossed by the Route Centerlines cont.

Segment 

Number Proposed or Alternative Name

Segment Length 

(Miles)

Core Areas 

Crossed Key Areas Crossed

R1 Habitats 

Crossed

R2 Hab

Cros

Proposed – Total Length 118.2 11.9 16.5 

Proposed – Comparison portion for Alternatives 7A,B 35.1Alternative 7A 37.7 4.6 Alternative 7B 46.2 7.9 1.1 

Proposed – Comparison portion for Alternative 7C 20.1 0.2 11.0 

Alternative 7C 20.3 11.0 

Proposed – Comparison portion for Alternative 7D 6.2 1.7 3.2 Alternative 7D 6.8 2.5 1.7 Proposed – Comparison portion for Alternative 7E 3.8 3.0 

Alternative 7E 4.5 3.2 

Proposed – Comparison portion for Alternative 7F 10.5 5.1 

Alternative 7F 10.8 3.3 

Proposed – Comparison portion for Alternative 7G 3.3 3.3 

Alternative 7G 3.4 3.4 Proposed – Comparison portion for Alternative 7K 118.2 11.9 16.5 

Alternative 7K 148.1 49.1 39.4 1.8 

Proposed – Total Length 131.5 15.1 20.0 11Proposed – Comparison portion for Alternative 8A 51.9 7.8 19.1 8.9 

Alternative 8A 53.6 15.6 5.7 

Proposed – Comparison portion for Alternative 8B 45.3Alternative 8B 45.8Proposed – Comparison portion for Alternative 8C 6.5Alternative 8C 6.4Proposed – Comparison portion for Alternative 8D 6.9Alternative 8D 8.1Proposed – Comparison portion for Alternative 8E 7.0Alternative 8E 18.3Proposed – Total Length 162.2 11.2 10.0 

Proposed – Comparison portion for Alternative 9A 7.8 0.2 

Alternative 9A 7.7 2.2 

Proposed – Comparison portion for Alternative 9B 49.1 6.3 8.7 

Alternative 9B 52.3Proposed – Comparison portion for Alternative 9C 14.4 5.0 8.6 

Alternative 9C 14.4 0.9 Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 Alternative 9D 60.1 Alternative 9F 63.3 Alternative 9G 57.8 Alternative 9H 61.0 Proposed – Comparison portion for Alternative 9E (revised) 61.4 Alternative 9E (revised) 70.6 18.2 5.4 15

10 Proposed – Total Length 34.4 0.1 6.0 5.7 

Notes: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero miles or null valueNotes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7

987

Table D.11-11 Page 2 of 2

Gateway West Transmission Line Final EIS
Table D.11-14. Acres of Construction Impacts to Agency Designated Greater Sage-Grouse Habitat

Segment 

Number Proposed or Alternative Name

Segment Length 

(Miles)

Core Areas 

Crossed

Key Areas 

Crossed

R1 Habitats 

Crossed

R2 H

Cro

1W(a) Proposed – Total Length 73.8 289Proposed – Comparison portion for Alternative 1W(a)-B 16.5 9Alternative 1W(a)-B 20.9 137

1W(c) Proposed – Total Length 73.6 298Proposed – Total Length 91.9 717Proposed – Comparison portion for Alternative 2A 16.8 69Alternative 2A 16.0 91

Proposed – Comparison portion for Alternative 2B 12.5Alternative 2B 12.2Segment 3 Proposed – Total Length 45.9Segment 3A Proposed – Total Length 5.1Proposed – Total Length 197.6 792 284 

Proposed – Comparison portion for Alternatives 4B-4F 85.2 588 48 

Alternative 4B 100.2 855 117 6 

Alternative 4C 101.6 1,024 104 6 

Alternative 4D 100.8 880 118 6 

Alternative 4E 102.2 1,042 100 6 

Alternative 4F 87.5 587 57 

Proposed – Total Length 55.7Proposed – Comparison portion for Alternatives 5A,B 22.3Alternative 5A 29.7 46 <1 Alternative 5B 40.4 166 20 Proposed – Comparison portion for Alternative 5C 32.9Alternative 5C 26.0Proposed – Comparison portion for Alternative 5D 19.2Alternative 5D 17.0Proposed – Comparison portion for Alternative 5E 5.8Alternative 5E 5.3

6 Proposed – Total Length 0.5 15 

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero acres or null value

1/ Alternative 4G was added in late 2012 and was therefore not added to this table

1W

2

41/

53

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 

Table D.11-14 Page 1 of 2

Gateway West Transmission Line Final EIS
Table D.11-14. Acres of Construction Impacts to Agency Designated Greater Sage-Grouse Habitat cont.

Segment 

Number Proposed or Alternative Name

Segment Length 

(Miles)

Core Areas 

Crossed

Key Areas 

Crossed

R1 Habitats 

Crossed

R2 H

Cro

Proposed – Total Length 118.2 219 315 Proposed – Comparison portion for Alternatives 7A,B 35.1Alternative 7A 37.7 70 <1 Alternative 7B 46.2 127 25 Proposed – Comparison portion for Alternative 7C 20.1 2 220 Alternative 7C 20.3 t2/ 211 

Proposed – Comparison portion for Alternative 7D 6.2 27 71 Alternative 7D 6.8 34 63 Proposed – Comparison portion for Alternative 7E 3.8 50 Alternative 7E 4.5 70 Proposed – Comparison portion for Alternative 7F 10.5 97 Alternative 7F 10.8 63 Proposed – Comparison portion for Alternative 7G 3.3 61 Alternative 7G 3.4 82 Proposed – Comparison portion for Alternative 7K 118.2 218 315 Alternative 7K 148.1 946 735 Proposed – Total Length 131.5 251 379 2Proposed – Comparison portion for Alternative 8A 51.9 114 350 Alternative 8A 53.6 242 Proposed – Comparison portion for Alternative 8B 45.3Alternative 8B 45.8Proposed – Comparison portion for Alternative 8C 6.5Alternative 8C 6.4Proposed – Comparison portion for Alternative 8D 6.9Alternative 8D 8.1Proposed – Comparison portion for Alternative 8E 7.0Alternative 8E 18.3Proposed – Total Length 162.2 226 180 Proposed – Comparison portion for Alternative 9A 7.8 10 Alternative 9A 7.7 40 Proposed – Comparison portion for Alternative 9B 49.1 122 170 Alternative 9B 52.3 20 Proposed – Comparison portion for Alternative 9C 14.4 103 162 Alternative 9C 14.4 31 Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 Alternative 9D 60.1 Alternative 9F 63.3 Alternative 9G 57.8 Alternative 9H 61.0 Proposed – Comparison portion for Alternative 9E (revised) 61.4 Alternative 9E (revised) 70.6 7 85 2

10 Proposed – Total Length 34.4 14 93 

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero acres or null value

2/ "t" indicates only a trace amount (<0.1 acre) of impact

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 

987

Table D.11-14 Page 2 of 2

Gateway West Transmission Line Final EIS
Table D.11-15. Acres of Operations Impacts to Agency Designated Greater Sage-Grouse Habitat

Segment 

Number Proposed or Alternative Name

Segment Length 

(Miles)

Core Areas 

Crossed

Key Areas 

Crossed

R1 Habitats 

Crossed

R2 H

Cro

1W(a) Proposed – Total Length 73.8 62Proposed – Comparison portion for Alternative 1W(a)-B 16.5 1Alternative 1W(a)-B 20.9 231W(c) Proposed – Total Length 73.6 34Proposed – Total Length 91.9 90Proposed – Comparison portion for Alternative 2A 16.8 7Alternative 2A 16.0 12

Proposed – Comparison portion for Alternative 2B 12.5Alternative 2B 12.2Segment 3 Proposed – Total Length 45.9Segment 3A Proposed – Total Length 5.1Proposed – Total Length 197.6 101 33 

Proposed – Comparison portion for Alternatives 4B-4F 85.2 78 5 Alternative 4B 100.2 111 13 2 

Alternative 4C 101.6 131 12 2 

Alternative 4D 100.8 117 13 2 

Alternative 4E 102.2 137 11 2 

Alternative 4F 87.5 81 6 Proposed – Total Length 55.7Proposed – Comparison portion for Alternatives 5A,B 22.3Alternative 5A 29.7 7 t1/ 

Alternative 5B 40.4 23 2 Proposed – Comparison portion for Alternative 5C 32.9Alternative 5C 26.0Proposed – Comparison portion for Alternative 5D 19.2Alternative 5D 17.0Proposed – Comparison portion for Alternative 5E 5.8Alternative 5E 5.3

6 Proposed – Total Length 0.5 15 

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero acres or null value

1/ "t" indicates only a trace amount (<0.1 acre) of impact2/ Alternative 4G was added in late 2012 and was therefore not added to this table

1W

2

42/

53

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 

Table D.11-15 Page 1 of 2

Gateway West Transmission Line Final EIS
Table D.11-15. Acres of Operations Impacts to Agency Designated Greater Sage-Grouse Habitat cont.

Segment 

Number Proposed or Alternative Name

Segment Length 

(Miles)

Core Areas 

Crossed

Key Areas 

Crossed

R1 Habitats 

Crossed

R2 H

Cro

Proposed – Total Length 118.2 27 35 Proposed – Comparison portion for Alternatives 7A,B 35.1Alternative 7A 37.7 10 t1/ 

Alternative 7B 46.2 20 4 Proposed – Comparison portion for Alternative 7C 20.1 <1 24 Alternative 7C 20.3 16 Proposed – Comparison portion for Alternative 7D 6.2 4 5 Alternative 7D 6.8 5 3 Proposed – Comparison portion for Alternative 7E 3.8 4 Alternative 7E 4.5 7 Proposed – Comparison portion for Alternative 7F 10.5 9 Alternative 7F 10.8 7 Proposed – Comparison portion for Alternative 7G 3.3 5 Alternative 7G 3.4 5 Proposed – Comparison portion for Alternative 7K 118.2 27 35 Alternative 7K 148.1 131 81 Proposed – Total Length 131.5 29 39 Proposed – Comparison portion for Alternative 8A 51.9 16 38 Alternative 8A 53.6 29 Proposed – Comparison portion for Alternative 8B 45.3Alternative 8B 45.8Proposed – Comparison portion for Alternative 8C 6.5Alternative 8C 6.4Proposed – Comparison portion for Alternative 8D 6.9Alternative 8D 8.1Proposed – Comparison portion for Alternative 8E 7.0Alternative 8E 18.3Proposed – Total Length 162.2 28 17 Proposed – Comparison portion for Alternative 9A 7.8 <1 Alternative 9A 7.7 3 Proposed – Comparison portion for Alternative 9B 49.1 14 16 Alternative 9B 52.3Proposed – Comparison portion for Alternative 9C 14.4 12 13 Alternative 9C 14.4 2 Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 Alternative 9D 60.1 Alternative 9F 63.3 Alternative 9G 57.8 Alternative 9H 61.0 Proposed – Comparison portion for Alternative 9E (revised) 61.4 Alternative 9E (revised) 70.6 2 9 

10 Proposed – Total Length 34.4 7 8 

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero acres or null value

1/ "t" indicates only a trace amount (<0.1 acre) of impact2/ Alternative 4G was added in late 2012 and was therefore not added to this table

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 

987

Table D.11-15 Page 2 of 2

Gateway West Transmission Line Final EIS
Lek ID Agency Management Status Route Associated with Closest Disturbance or Centerline1/

Distance to Closest 

Disturbance or Project 

Centerline 

(miles)

Visible Dista

from Lek To

(m

1O062 Bankhead Jones Occupied Alternative 7K 1.00 0

1O069 Bankhead Jones Undetermined Alternative 7K 1.48 0

22-2281293 Bureau of Land Management Occupied Segment 2 Proposed - Total Length 3.68 0

22-2282061 Bureau of Land Management Occupied Segment 2 Proposed - Total Length 2.40 0

22-2283321 Bureau of Land Management Occupied Segment 2 Proposed - Total Length 1.72 0

22-2283324 Bureau of Land Management Undetermined Segment 2 Proposed - Total Length 0.95 022-2382221 Bureau of Land Management Occupied Segment 2 Proposed - Total Length 2.50 0

22-2382283 Bureau of Land Management Occupied Segment 2 Proposed - Total Length 1.68 0

22-2382343 Bureau of Land Management Undetermined Segment 2 Proposed - Total Length 0.86 022-2481083 Bureau of Land Management Occupied Segment 2 Proposed - Total Length 3.90 0

22-Hanna Draw East 1 Bureau of Land Management Occupied Segment 2 Proposed - Total Length 1.84 0

22-Hanna Draw East 2 Bureau of Land Management Occupied Segment 2 Proposed - Total Length 2.34 0

22-Missouri John Bureau of Land Management Occupied Segment 2 Proposed - Total Length 3.55 0

25-Cherokee Towers Bureau of Land Management Occupied Segment 2 Proposed - Total Length 1.23 0

25-Creston Bureau of Land Management Occupied Segment 2 Proposed - Total Length 2.84 025-Fox Farm Bureau of Land Management Occupied Segment 2 Proposed - Total Length 1.48 0

25-Lake Bed Bureau of Land Management Occupied Segment 2 Proposed - Total Length 0.55 0

25-Ram Canyon Bureau of Land Management Occupied Segment 2 Proposed - Total Length 1.01 0

25-Scottys Peak Bureau of Land Management Occupied Segment 2 Proposed - Total Length 1.53 0

25-Separation Hilltop Bureau of Land Management Occupied Segment 2 Proposed - Total Length 2.33 0

25-Smith Draw Bureau of Land Management Occupied Segment 2 Proposed - Total Length 1.75 025-South Cherokee Bureau of Land Management Occupied Segment 2 Proposed - Total Length 2.95 0

25-SW Riner Bureau of Land Management Occupied Segment 2 Proposed - Total Length 0.86 0

25-West Seaverson Bureau of Land Management Occupied Segment 2 Proposed - Total Length 3.57 0

27-2878143 Bureau of Land Management Occupied Segment 1W(c) Proposed - Total Length 3.51 0

27-Bates Creek Reservoir Bureau of Land Management Occupied Segment 1W(a) Proposed - Total Length 0.08 027-East Fork Bureau of Land Management Occupied Segment 1W(c) Proposed - Total Length 2.73 0

27-Upper Lone Tree Bureau of Land Management Occupied Segment 1W(a) Proposed - Total Length 1.27 02B013 Bureau of Land Management Occupied Alternative 4B 1.95 02B018 Bureau of Land Management Undetermined Alternative 4B 3.45 0

2B019 Bureau of Land Management Undetermined Alternative 4B 3.64 0

2B021 Bureau of Land Management Undetermined Alternative 4B 2.68 0

2B035 Bureau of Land Management Occupied Segment 4 Proposed - Total Length 0.76 0

2J010 Bureau of Land Management Undetermined Segment 10 Proposed - Total Length 2.21 02J012 Bureau of Land Management Undetermined Segment 10 Proposed - Total Length 1.22 02J013 Bureau of Land Management Undetermined Segment 10 Proposed - Total Length 0.77 02J014 Bureau of Land Management Undetermined Segment 10 Proposed - Total Length 0.00 02J017 Bureau of Land Management Undetermined Segment 10 Proposed - Total Length 1.44 02O164 Bureau of Land Management Undetermined Segment 9 Proposed - Total Length 2.14 02O189 Bureau of Land Management Occupied Alternative 9E (revised) 3.66 02O192 Bureau of Land Management Undetermined Alternative 9E (revised) 1.70 02O193 Bureau of Land Management Undetermined Alternative 9E (revised) 1.72 02O197 Bureau of Land Management Occupied Alternative 9E (revised) 2.26 02O199 Bureau of Land Management Undetermined Alternative 9E (revised) 3.94 02O200 Bureau of Land Management Undetermined Alternative 9E (revised) 3.80 0Notes: Blank cells indicate zero miles or null value

1/ Alternative 4G was added in late 2012 and was therefore not included in this table

2/ Distance to existing disturbances (i.e., highways or existing powerlines) that occur between the lek and the proposed Project3/ Distance to existing disturbances (i.e., highways or existing powerlines) that occur near the lek, but are not located between the lek and the proposed Project (e.g., disturbances that oc

Table D.11-16. Sightlines from Occupied and Undetermined Sage-Grouse Leks on Federally Managed Lands that are Located within 4 mile

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 

Table D.11-16 Page 1 of 4

Gateway West Transmission Line Final EIS
Lek ID Agency Management Status Route Associated with Closest Disturbance or Centerline1/

Distance to Closest 

Disturbance or Project 

Centerline 

(miles)

Visible Dista

from Lek To

(m

2O201 Bureau of Land Management Occupied Alternative 9E (revised) 2.46 02O204 Bureau of Land Management Undetermined Alternative 9E (revised) 1.06 02O205 Bureau of Land Management Undetermined Alternative 9E (revised) 2.41 02O278 Bureau of Land Management Undetermined Segment 9 Proposed - Total Length 0.32 02O441 Bureau of Land Management Undetermined Alternative 9E (revised) 2.26 0

2O442 Bureau of Land Management Undetermined Alternative 9E (revised) 2.85 0

2O442a Bureau of Land Management Undetermined Alternative 9E (revised) 3.11 02O618 Bureau of Land Management Occupied Alternative 9E (revised) 1.33 02O629 Bureau of Land Management Undetermined Segment 9 Proposed - Total Length 2.12 02O641 Bureau of Land Management Undetermined Alternative 9E (revised) 1.31 02T010 Bureau of Land Management Undetermined Segment 9 Proposed - Total Length 2.69 02T014 Bureau of Land Management Undetermined Segment 9 Proposed - Total Length 2.51 12T016 Bureau of Land Management Occupied Segment 9 Proposed - Total Length 3.20 0

2T063 Bureau of Land Management Occupied Alternative 7K 3.72 0

2T064 Bureau of Land Management Occupied Segment 9 Proposed - Total Length 3.04 0

2T138 Bureau of Land Management Undetermined Segment 9 Proposed - Total Length 1.14 02T149 Bureau of Land Management Occupied Segment 9 Proposed - Total Length 1.68 0

2T151 Bureau of Land Management Occupied Segment 9 Proposed - Total Length 1.09 0

2T152 Bureau of Land Management Occupied Segment 9 Proposed - Total Length 2.19 0

2T156 Bureau of Land Management Occupied Segment 9 Proposed - Total Length 3.28 0

4-Alkali Creek East Bureau of Land Management Occupied Alternative 4F 0.95 0

4-Alkali Creek West Bureau of Land Management Undetermined Alternative 4F 1.05 0

4C014 National Forest Undetermined Alternative 7K 3.85 0

4C015 National Forest Occupied Alternative 7K 3.18 0

4C016 National Forest Occupied Alternative 7K 3.18 04C017 National Forest Occupied Alternative 7K 2.22 0

4C018 Bureau of Land Management Occupied Alternative 7K 1.19 0

4C019 National Forest Undetermined Alternative 7K 1.33 0

4C020 National Forest Undetermined Alternative 7K 1.16 0

4C027 Bureau of Land Management Undetermined Alternative 7K 0.46 0

4C028 Bureau of Land Management Occupied Alternative 7K 1.71 04C029 Bureau of Land Management Undetermined Segment 7 Proposed - Total Length 2.83 0

4C030 Bureau of Land Management Undetermined Alternative 7K 1.07 0

4C036 Bureau of Land Management Undetermined Alternative 7K 2.29 0

4C037 Bureau of Land Management Undetermined Segment 7 Proposed - Total Length 0.68 04C052 Bureau of Land Management Occupied Alternative 7K 0.74 0

4C063 National Forest Occupied Alternative 7K 3.37 0

4C068 Bureau of Land Management Undetermined Alternative 7K 2.19 0

4C069 Bureau of Land Management Undetermined Alternative 7K 0.90 0

4C070 Bureau of Land Management Undetermined Alternative 7K 1.19 04C071 Bureau of Land Management Undetermined Alternative 7K 0.34 0

4C091 Bureau of Land Management Undetermined Alternative 7K 3.45 0

4C096 National Forest Undetermined Alternative 7K 2.58 0

4C097 National Forest Occupied Alternative 7K 3.47 04C099 National Forest Undetermined Alternative 7K 3.26 0

Notes: Blank cells indicate zero miles or null value

1/ Alternative 4G was added in late 2012 and was therefore not included in this table

2/ Distance to existing disturbances (i.e., highways or existing powerlines) that occur between the lek and the proposed Project3/ Distance to existing disturbances (i.e., highways or existing powerlines) that occur near the lek, but are not located between the lek and the proposed Project (e.g., disturbances that oc

Table D.11-16. Sightlines from Occupied and Undetermined Sage-Grouse Leks on Federally Managed Lands that are Located within 4 mile

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 

Table D.11-16 Page 2 of 4

Gateway West Transmission Line Final EIS
Lek ID Agency Management Status Route Associated with Closest Disturbance or Centerline1/

Distance to Closest 

Disturbance or Project 

Centerline 

(miles)

Visible Dista

from Lek To

(m

4C100 National Forest Undetermined Alternative 7K 3.71 0

4C101 Bureau of Land Management Occupied Alternative 7K 0.74 0

4C102 National Forest Occupied Alternative 7K 3.45 04C106 National Forest Undetermined Alternative 7K 3.93 0

4C110 Bureau of Land Management Occupied Alternative 7K 3.72 04C111a Bureau of Land Management Occupied Alternative 7K 1.04 0

4C111b Bureau of Land Management Occupied Alternative 7K 0.70 0

4C117 Bureau of Land Management Undetermined Alternative 7F 0.02 0

4C119 Bureau of Land Management Undetermined Alternative 7K 1.01 0

4C122 Bureau of Land Management Undetermined Alternative 7K 0.70 0

4C123 Bureau of Land Management Undetermined Alternative 7K 0.70 0

4C127 Bureau of Land Management Occupied Alternative 7K 0.17 0

4C128 Bureau of Land Management Occupied Alternative 7K 0.71 0

4C129 Bureau of Land Management Occupied Alternative 7K 0.72 0

4C133 Bureau of Land Management Undetermined Alternative 7K 1.86 0

4C137 Bureau of Land Management Occupied Segment 7 Proposed - Total Length 2.82 0

4C138 Bureau of Land Management Undetermined Alternative 7K 0.89 0

4C139 Bureau of Land Management Occupied Alternative 7K 0.39 0

4C141 Bureau of Land Management Occupied Alternative 7K 0.03 0

4C142 Bureau of Land Management Undetermined Alternative 7K 1.74 0

4C143 Bureau of Land Management Undetermined Segment 7 Proposed - Total Length 2.51 0

4C145a Bureau of Land Management Occupied Segment 7 Proposed - Total Length 3.89 0

4C146 National Forest Occupied Alternative 7K 0.23 0

4C163 Bureau of Land Management Occupied Alternative 7K 1.98 0

4C165 National Forest Occupied Alternative 7K 3.35 04C178 Bureau of Land Management Occupied Alternative 7K 2.20 0

4C179 National Forest Occupied Alternative 7K 0.33 0

4-Chicken Creek National Park Service Occupied Alternative 4B 2.14 0

4-Chicken Creek 2 National Park Service Occupied Alternative 4B 1.96 0

4-County Rd 4 Bureau of Reclamation Occupied Alternative 4F 0.93 04-Craven Reservoir 1 Bureau of Land Management Occupied Alternative 4F 0.19 04-Craven Reservoir 2 Bureau of Land Management Undetermined Alternative 4F 0.09 0

4-Dempsey Basin Bureau of Land Management Occupied Alternative 4F 0.95 04-East Willow Ck Bureau of Land Management Occupied Alternative 4F 2.27 04-Horse Creek Bureau of Land Management Occupied Alternative 4C 1.53 0

4-Linden Canyon Bureau of Land Management Occupied Alternative 4B 3.32 0

4-Nancy Hill Grave Bureau of Land Management Occupied Segment 4 Proposed - Total Length 0.28 0

4-North Fork Dempsey Creek Bureau of Land Management Occupied Alternative 4F 0.88 04-North Twin Cr Bureau of Land Management Occupied Alternative 4B 2.83 0

4-Opal Bench 1 Bureau of Land Management Occupied Alternative 4F 2.73 0

4-Opal Bench 2 Bureau of Land Management Occupied Alternative 4F 1.25 0

4-Oyster Ridge South Bureau of Land Management Undetermined Alternative 4F 2.81 04-Petersen Ranch Lek Bureau of Land Management Occupied Alternative 4C 2.04 0

4-Quaken Asp Bureau of Land Management Undetermined Segment 4 Proposed - Total Length 0.77 0

4-Round Mtn Bureau of Land Management Occupied Alternative 4F 2.19 0

Notes: Blank cells indicate zero miles or null value

1/ Alternative 4G was added in late 2012 and was therefore not included in this table

2/ Distance to existing disturbances (i.e., highways or existing powerlines) that occur between the lek and the proposed Project3/ Distance to existing disturbances (i.e., highways or existing powerlines) that occur near the lek, but are not located between the lek and the proposed Project (e.g., disturbances that oc

Table D.11-16. Sightlines from Occupied and Undetermined Sage-Grouse Leks on Federally Managed Lands that are Located within 4 mile

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 

Table D.11-16 Page 3 of 4

Gateway West Transmission Line Final EIS
Lek ID Agency Management Status Route Associated with Closest Disturbance or Centerline1/

Distance to Closest 

Disturbance or Project 

Centerline 

(miles)

Visible Dista

from Lek To

(m

4-Seven Mile Gulch 1 Bureau of Land Management Occupied Alternative 4B 1.31 1

4-Small Pox Creek Bureau of Land Management Occupied Alternative 4B 2.14 0

4-Wyman Creek Bureau of Land Management Occupied Segment 4 Proposed - Total Length 1.21 0

4-Yellow Point North Bureau of Land Management Occupied Alternative 4F 0.64 05-Anna Richey Bureau of Land Management Occupied Alternative 4B 1.79 0

5-Bert Brush Bureau of Land Management Occupied Alternative 4B 3.05 05-Bridger Creek Bureau of Land Management Occupied Alternative 4B 2.16 0

5-Bulldog Hollow Bureau of Land Management Occupied Alternative 4B 2.58 0

5-Bulldog Hollow South Bureau of Land Management Occupied Alternative 4B 3.86 0

5-Bullpen Creek Bureau of Land Management Occupied Alternative 4B 0.53 05-Clear Creek Ridge Bureau of Land Management Occupied Alternative 4D 0.18 0

5-Collett Basin Bureau of Land Management Occupied Alternative 4D 2.84 05-East Fork Bullpen Bureau of Land Management Occupied Alternative 4D 0.83 0

5-Little Round Mtn North Bureau of Land Management Occupied Alternative 4B 0.16 0

5-Little Round Mtn South Bureau of Land Management Occupied Alternative 4B 3.12 0

5-Middle Clear Creek Ridge Bureau of Land Management Occupied Alternative 4D 1.70 0

5-North Crawford Bureau of Land Management Occupied Alternative 4B 3.96 0

5-Skull Point West Bureau of Land Management Occupied Alternative 4B 2.20 05-South Collett Ck Bureau of Land Management Occupied Alternative 4D 3.43 0

5-South Twin Creek Bureau of Land Management Occupied Alternative 4B 0.83 0

5-Zieglers Wonder Wash Bureau of Land Management Occupied Alternative 4B 2.73 0

7-Alkali Creek 4 Bureau of Land Management Occupied Segment 4 Proposed - Total Length 2.02 0

7-Blue Rim Bureau of Land Management Occupied Segment 4 Proposed - Total Length 3.19 09-Bitter Divide Bureau of Land Management Occupied Segment 3 Proposed - Total Length 1.12 09-Desert Springs North Bureau of Land Management Occupied Segment 3 Proposed - Total Length 1.16 0

9-Tipton North Bureau of Land Management Occupied Segment 3 Proposed - Total Length 2.50 0

E018 Bureau of Land Management Undetermined Segment 8 Proposed - Total Length 3.21 0E020 Bureau of Land Management Undetermined Segment 8 Proposed - Total Length 2.36 0E022 Bureau of Land Management Undetermined Segment 8 Proposed - Total Length 3.78 0E050 Bureau of Land Management Occupied Segment 8 Proposed - Total Length 2.22 0

E051 Bureau of Land Management Undetermined Segment 8 Proposed - Total Length 2.97 0

E071 Bureau of Land Management Occupied Segment 8 Proposed - Total Length 2.91 0

Notes: Blank cells indicate zero miles or null value

1/ Alternative 4G was added in late 2012 and was therefore not included in this table

2/ Distance to existing disturbances (i.e., highways or existing powerlines) that occur between the lek and the proposed Project3/ Distance to existing disturbances (i.e., highways or existing powerlines) that occur near the lek, but are not located between the lek and the proposed Project (e.g., disturbances that ocNotes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 

Table D.11-16. Sightlines from Occupied and Undetermined Sage-Grouse Leks on Federally Managed Lands that are Located within 4 mile

Table D.11-16 Page 4 of 4

Gateway West Transmission Line Final EIS
2.1 Gravel Pit Gravel 

2.7 Forbis Gravel Pit Gravel 

21.3-21.9 Active Mining Claim 2 or more 40.6-42.0 Active Mining Claim 2 or more 43.8-46.3 Active Mining Claim 2 or more 

13.1 Glenrock South Oil/Gas Well Oil/Gas 

13.5 Glenrock South Oil/Gas Well Oil/Gas 

14.6 Glenrock South Oil/Gas Well Oil/Gas 

17.1 Drill Hole Oil/Gas 17.5 Drill Hole Oil/Gas 

19.9-20.5 Active Mining Claim 2 or more 39.2-41.4 Active Mining Claim 2 or more 42.0-42.5 Active Mining Claims Uranium 42.5-45.0 Active Mining Claims 2 or more 

5.8 WC Oil/Gas Well Oil/Gas 

9.6-9.9 Active Coal Lease Coal 

9.6-13.0 Seminoe II Mine Permit Coal 

10.4-11.4 Mine Surface Reclamation Coal 11.1-11.5 Active Coal Lease Coal 

12.6-13.0 Active Coal Lease Coal 

15.6-16.0 EDC Mine Permit Coal 16.9-17.2 Mine Surface Reclamation Coal 17.1-21.6 EDC Mine Permit Coal 21.6-23.0 EDC Mine Permit Coal 32.0-32.3 Active MMD Claim Sand and 37.0-37.7 Active MMD Claim Sand and 

37.7 Gravel Pit Gravel 

37.8 Sand Pit Sand 

62.3-62.8 Active Mining Claim Uranium 63.8-69.2 Active Mining Claim Uranium 

80.1 Echo Springs Oil/Gas Well Oil/Gas 

82.2 Echo Springs Oil/Gas Well Oil/Gas 

83.9 Echo Springs Oil/Gas Well Oil/Gas 

84.7 Echo Springs Oil/Gas Well Oil/Gas 

85.1 Echo Springs Oil/Gas Well Oil/Gas 

85.6 Echo Springs Oil/Gas Well Oil/Gas 

86.1 Echo Springs Oil/Gas Well Oil/Gas 

86.6 Echo Springs Oil/Gas Well Oil/Gas 

87.1 Echo Springs Oil/Gas Well Oil/Gas 

87.1 Echo Springs Oil/Gas Well Oil/Gas 

87.6 Echo Springs Oil/Gas Well Oil/Gas 

88.0 Echo Springs Oil/Gas Well Oil/Gas 

88.1 Echo Springs Oil/Gas Well Oil/Gas 

89.5 Echo Springs Oil/Gas Well Oil/Gas 

90.9 Tierney Oil/Gas Well Oil/Gas 91.9 Tierney Oil/Gas Well Oil/Gas 

9.1-9.4 Gravel Pit Gravel 

10.0-10.3 Active MMD Claim Sand and 10.5-10.8 Active MMD Claim Sand and 

10.7 Gravel Pit Gravel 10.8 Gravel Pit Gravel 

5.4-5.8 Gravel Pit Gravel 6.2-6.5 Gravel Pits Gravel 

2

Table D.12-1. Mining Activities Within 1,000 Feet of Transmission Line Routes, Observed From Aerial Photograph Reconnaissance and T

1W(c) Proposed – Total Length

Alternative 2AAlternative 2B

Proposed Alternative or Route Name1/

1W

Segment Number Land Use/Feature Type 

1W(a) Proposed – Total Length

Alternative 1W(a)-B

Proposed – Total Length

Milepost Location M

Table D.12-1 Page 1 of 7

Gateway West Transmission Line Final EIS
0.2 Tierney Oil/Gas Well Oil/Gas 

0.9 Tierney Oil/Gas Well Oil/Gas 1.0 Tierney Oil/Gas Well Oil/Gas 1.3 Tierney Oil/Gas Well Oil/Gas 1.4 Tierney Oil/Gas Well Oil/Gas 1.5 Tierney Oil/Gas Well Oil/Gas 1.6 Tierney Oil/Gas Well Oil/Gas 2.1 Frewen Oil/Gas Well Oil/Gas 

2.6 Frewen Oil/Gas Well Oil/Gas 2.8 Frewen Oil/Gas Well Oil/Gas 4.1 Frewen Oil/Gas Well Oil/Gas 4.2 Frewen Oil/Gas Well Oil/Gas 5.7 Frewen Oil/Gas Well Oil/Gas 

21.1 Tipton Oil/Gas Well Oil/Gas 30.2 Patric Draw North Oil/Gas Well Oil/Gas 

30.4 Patric Draw North Oil/Gas Well Oil/Gas 

31.6 Arch Oil/Gas Well Oil/Gas 

34.4 Desert Springs West Oil/Gas Well Oil/Gas 

34.9 Desert Springs West Oil/Gas Well Oil/Gas 35.1 Desert Springs West Oil/Gas Well Oil/Gas 35.4 Desert Springs West Oil/Gas Well Oil/Gas 38.4 Red Hill Oil/Gas Well Oil/Gas 

40.3-40.8 Active Coal Lease Coal 

41.4-42.4 Active Coal Lease Coal 

42.7 WC Oil/Gas Well Oil/Gas 

Segment 3A Proposed – Total Length 2.9 Desert Springs West Oil/Gas Well Oil/Gas 

3.0-3.9 Mining Surface Reclamation Coal 

3.4-3.9 Active Coal Lease Coal 

4.9 Deadman Wash Oil/Gas Well Oil/Gas 8.7 Deadman Wash Oil/Gas Well Oil/Gas 9.7 Mariann Oil/Gas Well Oil/Gas 

11.0 MariannOil/Gas Well Oil/Gas 

48.7-49.9 Active Solid Mineral Lease Trona 

50.2-51.0 Mining Surface Disturbance Trona 

50.2-51.4 Active Solid Mineral Lease Trona 

50.8-51.1 Active MMD Claim Sand and 52.6-53.6 Active Solid Mineral Lease Trona 53.6-53.8 Active Solid Mineral Lease Trona 

70.9 Whiskey Butte Oil/Gas Well Oil/Gas 

71.4 Whiskey Butte Oil/Gas Well Oil/Gas 71.6 Whiskey Butte Oil/Gas Well Oil/Gas 71.8 Whiskey Butte Oil/Gas Well Oil/Gas 72.1 Whiskey Butte Oil/Gas Well Oil/Gas 72.3 Whiskey Butte Oil/Gas Well Oil/Gas 72.5 Whiskey Butte Oil/Gas Well Oil/Gas 72.7 Whiskey Butte Oil/Gas Well Oil/Gas 73.1 Whiskey Butte Oil/Gas Well Oil/Gas 73.6 Whiskey Butte Oil/Gas Well Oil/Gas 73.8 Whiskey Butte Oil/Gas Well Oil/Gas 74.0 Whiskey Butte Oil/Gas Well Oil/Gas 74.1 Whiskey Butte Oil/Gas Well Oil/Gas 74.3 Whiskey Butte Oil/Gas Well Oil/Gas 74.3 Whiskey Butte Oil/Gas Well Oil/Gas 74.6 Whiskey Butte Oil/Gas Well Oil/Gas 75.0 Whiskey Butte Oil/Gas Well Oil/Gas 75.4 Whiskey Butte Oil/Gas Well Oil/Gas 75.5 Whiskey Butte Oil/Gas Well Oil/Gas 

3 Segment 3 Proposed – Total Length

Table D.12-1. Mining Activities Within 1,000 Feet of Transmission Line Routes, Observed From Aerial Photograph Reconnaissance and T

Segment Number Proposed Alternative or Route Name1/ Milepost Location Land Use/Feature Type M

4 Proposed – Total Length 2/

Table D.12-1 Page 2 of 7

Gateway West Transmission Line Final EIS
75.6 Whiskey Butte Oil/Gas Well Oil/Gas 

75.7 Whiskey Butte Oil/Gas Well Oil/Gas 75.9 Whiskey Butte Oil/Gas Well Oil/Gas 76.0 Whiskey Butte Oil/Gas Well Oil/Gas 76.2 Whiskey Butte Oil/Gas Well Oil/Gas 76.2 Whiskey Butte Oil/Gas Well Oil/Gas 76.6 Cow Hollow Oil/Gas Well Oil/Gas 76.6 Cow Hollow Oil/Gas Well Oil/Gas 79.0 Cow Hollow Oil/Gas Well Oil/Gas 79.0 Cow Hollow Oil/Gas Well Oil/Gas 79.6 Cow Hollow Oil/Gas Well Oil/Gas 80.1 Cow Hollow Oil/Gas Well Oil/Gas 80.7 Cow Hollow Oil/Gas Well Oil/Gas 

100.2 Active Coal Lease Coal 

105.6 Stone Quarry Stone-Ri

147.2-147.7 Gravel Pit Gravel 

195.3 Borrow Pit Gravel 

2.2 Gravel Pit Gravel 

7.4-11.4 Active Solid Mineral Lease Trona, O

10.2-10.7 Texasgulf Emergency Pond Soda As

13.1 Wild Hare Gulch Oil/Gas Well Oil/Gas 15.1 Wild Hare Gulch Oil/Gas Well Oil/Gas 15.3 Fabian Ditch Oil/Gas Well Oil/Gas 15.6 Bruff Oil/Gas Well Oil/Gas 16.0 Fabian Ditch Oil/Gas Well Oil/Gas 16.2 Fabian Ditch Oil/Gas Well Oil/Gas 16.4 Fabian Ditch Oil/Gas Well Oil/Gas 16.8 Fabian Ditch Oil/Gas Well Oil/Gas 17.0 Fabian Ditch Oil/Gas Well Oil/Gas 17.4 Fabian Ditch Oil/Gas Well Oil/Gas 17.6 Fabian Ditch Oil/Gas Well Oil/Gas 18.2 Fabian Ditch Oil/Gas Well Oil/Gas 18.5 Fabian Ditch Oil/Gas Well Oil/Gas 19.0 Fabian Ditch Oil/Gas Well Oil/Gas 19.5 Wilson Ranch Oil/Gas Well Oil/Gas 20.5 Wilson Ranch Oil/Gas Well Oil/Gas 21.6 Wilson Ranch Oil/Gas Well Oil/Gas 22.6 Wilson Ranch Oil/Gas Well Oil/Gas 43.5 Glencoe Mine Unknown 43.7 Glencoe Waste Rock Dump Unknown 

45.7-46.2 FMC Granger Reclamation Coal 

47.3-48.6 Elkol Strip Mine Coal 47.9-48.7 Active Coal Lease Coal 

48.0-48.7 Active Coal Lease Coal 54.6-54.9 Mine Surface Disturbance Unknown 63.0-64.6 Active Mining Claim 2 or more 

73.3-73.6 Carlisle Mine Surface Disturbance Coal 

73.7 Gravel Pit Gravel 

2.2 Gravel Pit Gravel 

7.4-11.4 FMC Active Solid Mineral Lease Trona, O

10.2-10.7 Texasgulf Emergency Pond Soda As

13.1 Wild Hare Gulch Oil/Gas Well Oil/Gas 15.1 Wild Hare Gulch Oil/Gas Well Oil/Gas 15.3 Fabian Ditch Oil/Gas Well Oil/Gas 15.6 Bruff Oil/Gas Well Oil/Gas 16.0 Fabian Ditch Oil/Gas Well Oil/Gas 

Milepost Location

Alternative 4B

Alternative 4C

Proposed – Total Length (cont.)

4 (cont.)

Land Use/Feature Type M

Table D.12-1. Mining Activities Within 1,000 Feet of Transmission Line Routes, Observed From Aerial Photograph Reconnaissance and T

Proposed Alternative or Route Name1/ Segment Number

Table D.12-1 Page 3 of 7

Gateway West Transmission Line Final EIS
16.2 Fabian Ditch Oil/Gas Well Oil/Gas 

16.4 Fabian Ditch Oil/Gas Well Oil/Gas 

16.8 Fabian Ditch Oil/Gas Well Oil/Gas 

17.0 Fabian Ditch Oil/Gas Well Oil/Gas 

17.4 Fabian Ditch Oil/Gas Well Oil/Gas 

17.6 Fabian Ditch Oil/Gas Well Oil/Gas 

18.2 Fabian Ditch Oil/Gas Well Oil/Gas 

18.5 Fabian Ditch Oil/Gas Well Oil/Gas 

19.0 Fabian Ditch Oil/Gas Well Oil/Gas 

19.5 Wilson Ranch Oil/Gas Well Oil/Gas 20.5 Wilson Ranch Oil/Gas Well Oil/Gas 21.6 Wilson Ranch Oil/Gas Well Oil/Gas 22.6 Wilson Ranch Oil/Gas Well Oil/Gas 43.5 Glencoe Mine Unknown 43.7 Glencoe Mine Waste Rock Dump Unknown 

45.7-46.2 FMC Mine Reclamation Coal 

47.3-48.6 Elkol Strip Mine Coal 48.0-48.7 Active Coal Lease Coal 

54.6-54.9 Mine Surface Disturbance Unknown 63.0-64.6 Active Mining Claim 2 or More 78.2-78.4 Gravel Pit Gravel 

78.3 Gravel Pit Gravel 

75.9-76.3 Gravel Pit Gravel 

2.2 Gravel Pit Gravel 

7.4-11.4 FMC Solid Mineral Lease Trona, O

10.2-10.7 Texagulf Emergency Pond Soda As

13.1 Wild Hare Gulch Oil/Gas Well Oil/Gas 

15.1 Wild Hare Gulch Oil/Gas Well Oil/Gas 

15.3 Fabian Ditch Oil/Gas Well Oil/Gas 

15.6 Bruff Oil/Gas Well Oil/Gas 

16.0 Fabian Ditch Oil/Gas Well Oil/Gas 

16.2 Fabian Ditch Oil/Gas Well Oil/Gas 

16.4 Fabian Ditch Oil/Gas Well Oil/Gas 

16.8 Fabian Ditch Oil/Gas Well Oil/Gas 

17.0 Fabian Ditch Oil/Gas Well Oil/Gas 

17.4 Fabian Ditch Oil/Gas Well Oil/Gas 

17.6 Fabian Ditch Oil/Gas Well Oil/Gas 

18.2 Bruff Oil/Gas Well Oil/Gas 

18.5 Fabian Ditch Oil/Gas Well Oil/Gas 

19.0 Fabian Ditch Oil/Gas Well Oil/Gas 

19.5 Wilson Ranch Oil/Gas Well Oil/Gas 20.5 Wilson Ranch Oil/Gas Well Oil/Gas 21.6 Wilson Ranch Oil/Gas Well Oil/Gas 22.6 Wilson Ranch Oil/Gas Well Oil/Gas 43.5 Glencoe Mine Unknown 43.7 Glencoe Mine Waste Rock Dump Unknown 

45.7-46.2 FMC Mine Reclamation Coal 

47.3-48.6 Elkol Strip Mine Coal 48.0-48.7 Active Coal Lease Coal 

56.2-56.4 Mine Surface Disturbance Unknown 63.6-65.3 Active Mining Claim 2 or More 73.9-74.2 Carlisle Mine Surface Reclamation Coal 

74.3 Gravel Pit Gravel 

Milepost Location Land Use/Feature Type M

Alternative 4C (cont.)

4 (cont.)

Table D.12-1. Mining Activities Within 1,000 Feet of Transmission Line Routes, Observed From Aerial Photograph Reconnaissance and T

Segment Number Proposed Alternative or Route Name1/

Alternative 4D

Table D.12-1 Page 4 of 7

Gateway West Transmission Line Final EIS
2.2 Gravel Pit Gravel 

7.4-11.4 FMC Solid Mineral Lease Trona, O

10.2-10.7 Texas Gulf Emergency Pond Soda As

13.1 Wild Hare Gulch Oil/Gas Well Oil/Gas 

15.1 Wild Hare Gulch Oil/Gas Well Oil/Gas 

15.3 Fabian Ditch Oil/Gas Well Oil/Gas 

15.6 Bruff Oil/Gas Well Oil/Gas 

16.0 Fabian Ditch Oil/Gas Well Oil/Gas 

16.2 Fabian Ditch Oil/Gas Well Oil/Gas 

16.4 Fabian Ditch Oil/Gas Well Oil/Gas 

16.8 Fabian Ditch Oil/Gas Well Oil/Gas 

17.0 Fabian Ditch Oil/Gas Well Oil/Gas 

17.4 Fabian Ditch Oil/Gas Well Oil/Gas 

17.6 Fabian Ditch Oil/Gas Well Oil/Gas 

18.2 Bruff Oil/Gas Well Oil/Gas 

18.5 Fabian Ditch Oil/Gas Well Oil/Gas 

19.0 Fabian Ditch Oil/Gas Well Oil/Gas 

19.5 Wilson Ranch Oil/Gas Well Oil/Gas 20.5 Wilson Ranch Oil/Gas Well Oil/Gas 21.6 Wilson Ranch Oil/Gas Well Oil/Gas 22.6 WC Oil/Gas Well Oil/Gas 43.5 Glencoe Mine Unknown 43.7 Glencoe Mine Waste Rock Dump Unknown 

45.7-46.2 FMC Mine Reclamation Coal 

47.3-48.6 Elkol Strip Mine Coal 

47.4 Mine Unknown 

48.0-48.7 Active Coal Lease Coal 

56.2-56.4 Mine Surface Disturbance Unknown 63.6-65.3 Active Mining Claim 2 or More 76.5-76.9 Gravel Pit Gravel 78.8-79.0 Gravel Pit Gravel 

1.1-2.0 Active Solid Mineral Lease Trona 2.0-2.2 Active Solid Mineral Lease Trona 

19.3 Whiskey Butte Oil/Gas Well Oil/Gas 19.8 Whiskey Butte Oil/Gas Well Oil/Gas 20.0 Whiskey Butte Oil/Gas Well Oil/Gas 20.2 Whiskey Butte Oil/Gas Well Oil/Gas 20.5 Whiskey Butte Oil/Gas Well Oil/Gas 20.7 Whiskey Butte Oil/Gas Well Oil/Gas 20.9 Whiskey Butte Oil/Gas Well Oil/Gas 21.1 Whiskey Butte Oil/Gas Well Oil/Gas 21.5 Whiskey Butte Oil/Gas Well Oil/Gas 22.0 Whiskey Butte Oil/Gas Well Oil/Gas 22.2 Whiskey Butte Oil/Gas Well Oil/Gas 22.4 Whiskey Butte Oil/Gas Well Oil/Gas 22.5 Whiskey Butte Oil/Gas Well Oil/Gas 22.7 Whiskey Butte Oil/Gas Well Oil/Gas 22.8 Whiskey Butte Oil/Gas Well Oil/Gas 23.0 Whiskey Butte Oil/Gas Well Oil/Gas 23.4 Whiskey Butte Oil/Gas Well Oil/Gas 23.8 Whiskey Butte Oil/Gas Well Oil/Gas 24.0 Whiskey Butte Oil/Gas Well Oil/Gas 24.1 Whiskey Butte Oil/Gas Well Oil/Gas 24.1 Whiskey Butte Oil/Gas Well Oil/Gas 24.3 Whiskey Butte Oil/Gas Well Oil/Gas 

4 (cont.)

Alternative 4E

Alternative 4F

Proposed Alternative or Route Name1/ Milepost Location Land Use/Feature Type M

Table D.12-1. Mining Activities Within 1,000 Feet of Transmission Line Routes, Observed From Aerial Photograph Reconnaissance and T

Segment Number

Table D.12-1 Page 5 of 7

Gateway West Transmission Line Final EIS
24.4 Whiskey Butte Oil/Gas Well Oil/Gas 

24.6 Whiskey Butte Oil/Gas Well Oil/Gas 24.6 Whiskey Butte Oil/Gas Well Oil/Gas 25.0 Cow Hollow Oil/Gas Well Oil/Gas 27.0 Cow Hollow Oil/Gas Well Oil/Gas 27.4 Cow Hollow Oil/Gas Well Oil/Gas 27.4 Cow Hollow Oil/Gas Well Oil/Gas 28.0 Cow Hollow Oil/Gas Well Oil/Gas 28.5 Cow Hollow Oil/Gas Well Oil/Gas 29.1 Cow Hollow Oil/Gas Well Oil/Gas 48.6 Active Coal Lease Coal 

Proposed-Total Length 51.4 Borrow Pit Sand/Gra

Alternative 5B 20.0-20.2 Active MMD Claim Sand/Gra

Alternative 5D 15.9 Borrow Pit Sand/Gra

21.3-21.4 Borrow Pit Sand/Gra21.3-21.5 Active MMD Claim Sand/Gra

40.2 Borrow Pit Sand/Gra

77.5-79.9 Active Geothermal Lease Geotherm

95.4-95.7 Active MMD Claim Stone/Ri

95.5 Borrow Pit Stone/Ri

107.7-108.7 Active Mining Claim Unknown 

109.4 Active Mining Claim Unknown 

112.2-112.7 Active Mining Claim Unknown 112.7-113.2 Active Mining Claim Unknown 120.4-121.9 Active Mining Claim Specialty 137.1-137.6 Active Mining Claim Gold 

21.9-22.0 Gravel Pit Gravel 

57.4 Gravel Pit Sand/Gra88.5 Gravel Pit Gravel 91.2 Gravel Pit Gravel 

117.5 Clay Pit Clay 

Alternative 8A 39.9 Gravel Pit Sand/Gra

29.2-29.5 Galey Gravel Pit Gravel 

34.9-35.1 Active MMD Claim-BLM Pit Pumice/C40.7-40.8 Cinder Pit Sand/Gra

578

Alternative 4F (cont.)

Segment Number Proposed Alternative or Route Name1/

4 (cont.)2/

Milepost Location Land Use/Feature Type M

Table D.12-1. Mining Activities Within 1,000 Feet of Transmission Line Routes, Observed From Aerial Photograph Reconnaissance and T

Alternative 7B

Alternative 7K

Proposed – Total Length

Alternative 8B

Table D.12-1 Page 6 of 7

Gateway West Transmission Line Final EIS
3.7-4.0 Gravel Pit Sand/Gra

14.7 Active MMD Claim-BLM Pit Sand/Gra

32.6-33.6 Active Mining Claim Unknown 

57.7 Gravel Pit Sand/Gra

116.6-116.8 Gravel Pit Sand/Gra150.6-150.9 Active MMD Claim-BLM Pit Sand/Gra160.7-161.3 Active MMD Claim-BLM Pit Specialty 161.0-161.1 Clay Pit Clay 

5.9-6.2 Gravel Pit Sand/Gra

6.3 Gravel Pit Sand/Gra

16.7 Active MMD Claim-BLM Pit Sand/Gra40.2 Gravel Pit Sand/Gra

40.2-40.4 Active MMD Claim-ITD Pit Sand/Gra

Alternative 9C 9.6-9.9 Active MMD Claim-BLM Pit Sand/Gra

5.8-5.9 Active MMD Claim-Owyhee Co. Pit Sand/Gra

8.3-8.5 Gravel Pit Sand/Gra

14.8-14.9 Active MMD Claim-BLM Pit Common 25.2-25.5 Active MMD Claim-BLM Pit Common 

Alternative 9F 28.4-28.7 Active MMD Claim-BLM Pit Common 

5.8-5.9 Active MMD Claim-Owyhee Co. Pit Sand/Gra

8.3-8.5 Gravel Pit Sand/Gra

14.8-14.9 Active MMD Claim-BLM Pit Common 25.2-25.5 Active MMD Claim-BLM Pit Common 

Alternative 9H 28.4-28.7 Active MMD Claim-BLM Pit Common 

2.5-5.9 Active Geothermal Lease Geotherm

5.9-6.4 Active Mining Claim Unknown 

40.7-41.3 Active Mining Claim Unknown 42.2-42.8 Active Mining Claim Unknown 44.6-44.7 Active Mining Claim Placer 

1/ Some or all alternatives in Segments 5, 6, 7, 8, 9, and 10 do not contain mining activities. Alternatives without mining activities do not appear in this table.

2/ Alternative 4G was added in late 2012 and was therefore not added to this table

Note: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 

9

Land Use/Feature Type M

Proposed – Total Length

Alternative 9AAlternative 9B

Table D.12-1. Mining Activities Within 1,000 Feet of Transmission Line Routes, Observed From Aerial Photograph Reconnaissance and T

Segment Number Proposed Alternative or Route Name1/ Milepost Location

Alternative 9D

Alternative 9E (revised)

Alternative 9G

Table D.12-1 Page 7 of 7

Gateway West Transmission Line Final EIS
Segment Number Proposed or Alternative Name Segment Length (miles) Formation Name 

Quaternary alluvium 

Casper Formation 

Chugwater Formation or group 

Cloverly and Morrison Formations 

Cloverly, Morrison, and Sundance Formations Cody Shale 

Dune sand and loess 

Fox Hills Sandstone Frontier Formation Goose Egg Formation 

Granite Gneiss 

Granitic rocks Lance Formation Madison limestone, Darby Formation, Bighorn dolomite, Gallatin Limestone, GrosVentre FoMesaverde Formation or group 

Mowry and Thermopolis shales 

Niobrara Formation Steele Shale Tensleep Sandstone and Amsden Formation 

Upper Miocene Rocks 

White River Formation White River Formation - upper conglomerate member Quaternary alluvium Cody Shale 

Dune sand and loess 

Fox Hills Sandstone Lance Formation Mesa Verde Formation or group Quaternary alluvium Cody Shale 

Dune sand and loess 

Fox Hills Sandstone Lance Formation Mesa Verde Formation or group Quaternary alluvium Casper Formation 

Chugwater Formation or group 

Cloverly and Morrison Formations 

Cloverly, Morrison, and Sundance Formations Cody Shale 

Fox Hills Sandstone Frontier Formation Goose Egg Formation 

Granite Gneiss 

Granitic rocks Lance Formation Madison limestone, Darby Formation, Bighorn dolomite, Gallatin Limestone, GrosVentre FoMesaverde Formation or group 

Mowry and Thermopolis shales 

Niobrara Formation Steele Shale Upper Miocene Rocks White River Formation 

White River Formation - upper conglomerate member 

Notes: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: PFYC - Potential Fossil Yield Classification

73.8

Notes: Footnote explanations are provided on the last page of this table

1W

Proposed – Comparison portion for Alternative 1W(a)-B

1W(c) Proposed – Total Length 73.6

1W(a) Proposed - Total Length 

16.5

Table D.13-1. Paleontology Risk Factors for Proposed and Alternative Routes

Alternative 1W(a)-B 20.9

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), Pro

Table D.13-1 Page 1 of 13

Gateway West Transmission Line Final EIS
Segment Number Proposed or Alternative Name Segment Length (miles) Formation Name 

Quaternary undifferentiated (alluvium, colluvium, gravel, lacustrine) 

Ferris Formation Fort Union Formation Hanna Formation Lance Formation Lewis Shale Medicine Bow Formation Mesa Verde Formation or group 

Miocene Rocks 

Niobrara Formation Steele Shale Steele Shale and Niobrara Formations Wasatch Formation Quaternary alluvium Lewis Shale Medicine Bow Formation Mesa Verde Formation or group 

Miocene Rocks 

Steele Shale Steele Shale and Niobrara Formations Quaternary undfferentiated (alluvium, colluvium, gravel) Lewis Shale Medicine Bow Formation Mesa Verde Formation or group 

Miocene Rocks 

Steele Shale Steele Shale and Niobrara Formations Quaternary alluvium Mesaverde Formation or group 

Miocene Rocks 

Steele Shale Steele Shale and Niobrara Formations Quaternary alluvium Lewis Shale Mesaverde Formation or group 

Miocene Rocks 

Steele Shale Steele Shale and Niobrara Formations Quaternary undifferentiated (alluvium, colluvium, lacustrine) Dune sand and loess Fort Union Formation Fox Hills Sandstone and Lewis Shale Green River Formation: Luman Tongue 

Lance Formation Wasatch Formation 

Fox Hills Sandstone and Lewis Shale Mesaverde Group, Almond Formation 

Notes: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: PFYC - Potential Fossil Yield Classification

91.916.0

5.1

3

Segment 3A Proposed - Total Length

Alternative 2A

Notes: Footnote explanations are provided on the last page of this table

Segment 3 Proposed – Total Length

Proposed – Comparison portion for Alternative 2B 12.5

16.8

Alternative 2B 12.2

Table D.13-1. Paleontology Risk Factors for Proposed and Alternative Routes cont.

45.9

Proposed - Total Length

Proposed – Comparison portion for Alternative 2A

2 

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), Pro

Table D.13-1 Page 2 of 13

Gateway West Transmission Line Final EIS
Segment Number Proposed or Alternative Name Segment Length (miles) Formation Name 

Quaternary undfferentiated (alluvium, colluvium, gravel, landslide) 

Ankareh Formation, Thaynes Limestone, Woodside Shale, and Dinwoody Formation 

Aspen Shale 

Baxter Shale Bear River Formation Bridger Formation 

Dune sand and loess 

Evanston Formation Fort Union Formation Fowkes Formation Fox Hills Sandstone and Lewis Shale Frontier Formation Gannett Group Green River and Wasatch Formations 

Hilliard Shale 

Mesa Verde Group 

Nugget Sandstone 

Phosphoria Formation Sage Junction, Quealy, Cokeville, Thomas Fork, and Smiths Formations Salt Lake Formation Stump Formation, Preuss Sandstone or Redbeds, and Twin Creek Limestone 

Wasatch Formation 

Water Wells and Amsden Formations, Madison Limestone Blacksmith, Bancroft, and Ute Limestones Bloomington Formation (Cambrian siltstone/limestone) 

Lead Bell Shale Nounan Limestone St. Charles Limestone Twin Creek Limestone Nugget Sandstone Garden City Formation Swan Peak Quartzite Brigham Quartzite Bonneville and Alpine Formations Main Canyon Formation Ankareh Formation Thaynes Limestone Timothy Sandstone Salt Lake Formation Salt Lake and Starlight Formations, undifferentiated Quaternary undfferentiated (alluvium, colluvium, gravel, landslide) Ankareh Formation, Thaynes Limestone, Woodside Shale, and Dinwoody Formation 

Aspen Shale 

Bear River Formation Bridger Formation 

Dune sand and loess 

Evanston Formation Fowkes Formation Frontier Formation Gannett Group Green River and Wasatch Formations 

Hilliard Shale 

Nugget Sandstone Phosphoria Formation Sage Junction, Quealy, Cokeville, Thomas Fork, and Smiths Formations 

Notes: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: PFYC - Potential Fossil Yield Classification

Segment 4 Proposed - Total Length 197.6

4

Proposed – Comparison portion for Alternatives 4B-4F 85.2

Table D.13-1. Paleontology Risk Factors for Proposed and Alternative Routes cont.

Notes: Footnote explanations are provided on the last page of this tableNotes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), Pro

Table D.13-1 Page 3 of 13

Gateway West Transmission Line Final EIS
Segment Number Proposed or Alternative Name Segment Length (miles) Formation Name 

Salt Lake Formation Stump Formation, Preuss Sandstone or Redbeds, and Twin Creek Limestone 

Wasatch Formation Water Wells and Amsden Formations, Madison Limestone 

Twin Creek Limestone Salt Lake Formation Adaville Formation Quaternary undfferentiated (alluvium, colluvium, gravel) Ankareh Formation, Thaynes Limestone, Woodside Shale, and Dinwoody Formation 

Aspen Shale 

Bridger Formation 

Evanston Formation Fowkes Formation Frontier Formation Gannett Group 

Green River and Wasatch Formations 

Hilliard Shale Nugget Sandstone 

Salt Lake Formation Stump Fm., Preuss Redbeds, Twin Creek Limestone 

Wasatch Formation Twin Creek Limestone 

Salt Lake Formation Adaville Formation Quaternary undfferentiated (alluvium, colluvium, gravel) Ankareh Formation, Thaynes limestone, Woodside shale, and Dinwoody Formation 

Aspen Shale 

Bridger Formation 

Evanston Formation Fowkes Formation Frontier Formation Gannett Group 

Green River and Wasatch Formations 

Hilliard Shale Nugget Sandstone 

Sage Junction, Quely, Cokeville, Thomas Fork, and Smiths Formations 

Salt Lake Formation Stump Fm., Preuss Redbeds, Twin Creek Limestone 

Wasatch Formation Twin Creek Limestone 

Salt Lake Formation Adaville Formation Quaternary undifferentiated (alluvium, colluvium, gravel) Aspen Shale 

Bridger Formation 

Evanston Formation Fowkes Formation Frontier Formation Gannett group 

Green River and Wasatch Formations 

Hilliard Shale Nugget Sandstone 

Salt Lake Formation 

Notes: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: PFYC - Potential Fossil Yield Classification

100.7

Alternative 4B 100.2

Notes: Footnote explanations are provided on the last page of this table

4

(cont.)

Alternative 4D

101.6

Proposed – Comparison portion for Alternatives 4B-4F (cont.) 85.2

Alternative 4C

Table D.13-1. Paleontology Risk Factors for Proposed and Alternative Routes cont.

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), Pro

Table D.13-1 Page 4 of 13

Gateway West Transmission Line Final EIS
Segment Number Proposed or Alternative Name Segment Length (miles) Formation Name 

Stump Fm., Preuss Redbeds, Twin Creek Limestone 

Wasatch Formation Twin Creek Limestone 

Salt Lake Formation Adaville Formation Quaternary undifferentiated (alluvium, colluvium, gravel) Aspen Shale 

Bridger Formation 

Evanston Formation Fowkes Formation Frontier Formation Gannett Group 

Green River and Wasatch Formations 

Hilliard Shale Nugget Sandstone 

Sage Junction, Quealy, Cokeville, Thomas Fork, and Smiths Formations 

Salt Lake Formation Stump Fm., Preuss Redbeds, Twin Creek Limestone 

Wasatch Formation Twin Creek Limestone 

Salt Lake Formation Quaternary undifferentiated (alluvium, colluvium, gravel) Ankareh Formation, Thaynes Limestone, Woodside Shale, and Dinwoody Formation 

Aspen Shale 

Bear River Formation Bridger Formation 

Dune sand and loess 

Evanston Formation Fowkes Formation Frontier Formation Gannett Group 

Green River and Wasatch Formations 

Hilliard Shale 

Nugget Sandstone 

Phosphoria Formation 

Sage Junction, Quealy, Cokeville, Thomas Fork, and Smiths Formations 

Salt Lake Formation Stump Fm., Pruess Sandstone or Redbeds, and Twin Creek Limestone 

Wasatch Formation Wells and Amsden Formations Twin Creek Limestone 

Salt Lake Formation Garden City Formation St. Charles Limestone Pleistocene surficial deposits Quaternary undifferentiated (alluvium, colluvium, gravel) Ankareh Formation, Thaynes Limestone, Woodside Shale, and Dinwoody Formation Aspen Shale Nounan Dolomite St. Charles Limestone Deep Creek Formation Great Blue Limestone Fish Haven Dolomite Garden City Formation Swan Peak Quartzite PreCambrian undifferentiated Oquirrh Formation Quaternary undifferentiated (alluvium, colluvium, terrace, dunes, loess) Sunbeam Formation 

Notes: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: PFYC - Potential Fossil Yield Classification

Alternative 4G

Notes: Footnote explanations are provided on the last page of this table

Alternative 4D (cont.)

Alternative 4E 102.2

100.7

Table D.13-1. Paleontology Risk Factors for Proposed and Alternative Routes cont.

2.6

Alternative 4F

Proposed – Comparison portion for Alternative 4G 2.4

4

(cont.)

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), Pro

87.5

5 Proposed – Total Length 55.7

Table D.13-1 Page 5 of 13

Gateway West Transmission Line Final EIS
Segment Number Proposed or Alternative Name Segment Length (miles) Formation Name 

Quaternary travertine 

Salt Lake Formation Starlight Formation Starlight and Salt Lake Formations, undifferentiated Nounan Dolomite St. Charles Limestone Fish Haven Dolomite Garden City Formation Swan Peak Quartzite Oquirrh Formation Quaternary undifferentiated (alluvium, colluvium, terrace, dunes, loess) Quaternary travertine 

Salt Lake Formation 

Starlight and Salt Lake Formations, undifferentiated Swan Peak Quartzite Oquirrh Formation Upper Paleozoic, undifferentiated Quaternary undifferentiated (alluvium, colluvium) Laketown Dolomite Salt Lake Formation Swan Peak Quartzite Oquirrh Formation Upper Paleozoic, undifferentiated Quaternary undifferentiated (alluvium, colluvium, gravel, loess) Laketown Dolomite Salt Lake Formation Nounan Dolomite St. Charles Limestone Deep Creek Formation Great Blue Limestone Fish Haven Dolomite Garden City Formation Swan Peak Quartzite Oquirrh Formation Quaternary undifferentiated (alluvium, gravel, loess) Quaternary travertine Salt Lake Formation Starlight Formation Starlight and Salt Lake Formations, undifferentiated St. Charles Limestone Fish Haven Dolomite Garden City Formation Swan Peak Quartzite Quaternary undifferentiated (alluvium, gravel, loess) Starlight Formation Starlight and Salt Lake Formations, undifferentiated Deep Creek Formation Great Blue Limestone Oquirrh Formation Quaternary undifferentiated (alluvium, terrace deposits, dune sand, gravel, loess) Sunbeam Formation Starlight Formation 

Notes: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: PFYC - Potential Fossil Yield Classification

Table D.13-1. Paleontology Risk Factors for Proposed and Alternative Routes cont.

Alternative 5BAlternative 5A

Proposed – Comparison portion for Alternative 5C

Notes: Footnote explanations are provided on the last page of this table

19.232.926.0

Proposed – Comparison portion for Alternative 5D

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), Pro

22.3

Proposed – Comparison portion for Alternatives 5A,B

55.7

29.740.4

Alternative 5C 

Proposed – Total Length (cont.)

5

(cont.)

Table D.13-1 Page 6 of 13

Gateway West Transmission Line Final EIS
Segment Number Proposed or Alternative Name Segment Length (miles) Formation Name 

Oquirrh Formation 

Quaternary undifferentiated (alluvium, terrace deposits, dune sand, gravel, loess) 

Sunbeam Formation 

Quaternary undifferentiated (alluvium, terrace deposits, dune sand, gravel, loess) Sunbeam Formation Quaternary undifferentiated (alluvium, terrace deposits, dune sand, gravel, loess) Sunbeam Formation Quaternary dune sand 

Wendell Grade Basalt 

Albion Range metamorphic rocks Dolomite of Cassia County Nounan Dolomite St. Charles Limestone Unknown quartzite Manning Canyon Shale Fish Haven Dolomite Garden City Formation Swan Peak Quartzite PreCambrian undifferentiated Permian Limestone Oquirrh Formation Snake River Basalt Quaternary undifferentiated (alluvial fan, gravel, loess) Basalt of Table Mountain Quaternary travertine Tertiary basalt Basalt of Table Mountain Idavada Volcanics Salt Lake Formation Starlight Formation Starlight and Salt Lake Formations, undifferentiated Rhyolitic lava Nounan Dolomite St. Charles Limestone Fish Haven Dolomite Garden City Formation Swan Peak Quartzite Oquirrh Formation Quaternary undifferentiated (alluvial fan, gravel, loes, travertines) Basalt of Table Mountain Salt Lake Formation Starlight Formation Starlight and Salt Lake Formations, undifferentiated Swan Peak Quartzite Oquirrh Formation Upper Paleozoic, undifferentiated Quaternary undifferentiated (alluvium ,gravel, loess) Laketown Dolomite Salt Lake Formation Starlight Formation 

Notes: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: PFYC - Potential Fossil Yield Classification

6 Proposed - Total Length

Proposed - Total Length

Proposed - Comparison portion for Alternative 5E

Proposed - Comparison portion for Alternative 5E

Proposed – Comparison portion for Alternatives 7A,B

Table D.13-1. Paleontology Risk Factors for Proposed and Alternative Routes cont.

5.8

Alternative 7A

Alternative 5D

17.037.735.1

118.2

5.30.5

Notes: Footnote explanations are provided on the last page of this table

5

(cont.)

7

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), Pro

Table D.13-1 Page 7 of 13

Gateway West Transmission Line Final EIS
Segment Number Proposed or Alternative Name Segment Length (miles) Formation Name 

Swan Peak Quartzite Oquirrh Formation 

Upper Paleozoic, undifferentiated Quaternary undifferentiated (alluvium ,gravel, loess) Laketown Dolomite Salt Lake Formation Starlight Formation Quaternary alluvium Snake River Basalt Oquirrh Formation Quaternary alluvium Snake River Basalt Unknown quartzite Quaternary alluvium Snake River Basalt Tertiary basalt Rhyolitic lava Unknown quartzite Quaternary alluvium Snake River Basalt Albion Range metamorphic rocks Unknown quartzite Quaternary alluvium Albion Range metamorphic rocks Unknown quartzite Quaternary alluvium Albion Range metamorphic rocks Dolomite of Cassia County Unknown quartzite Manning Canyon Shale Permian Limestone Quaternary alluvium Albion Range metamorphic rocks Dolomite of Cassia County Schist of Mahogony Peaks Dayley Creek quartzite Unknown quartzite Quaternary alluvium Idavada Volcanics Idavada Volcanics 

Notes: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: PFYC - Potential Fossil Yield Classification

Proposed – Comparison portion for Alternative 7G

3.8

20.1

Proposed – Comparison portion for Alternative 7E

4.56.8

20.3

Alternative 7C

Proposed – Comparison portion for Alternative 7D 

Alternative 7E

Proposed – Comparison portion for Alternative 7C

Alternative 7G

Proposed – Comparison portion for Alternative 7F

Alternative 7F

Alternative 7D

10.510.8

6.2

3.33.4

46.2

Alternative 7B

Table D.13-1. Paleontology Risk Factors for Proposed and Alternative Routes cont.

Notes: Footnote explanations are provided on the last page of this table

7

(cont.)

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), Pro

Table D.13-1 Page 8 of 13

Gateway West Transmission Line Final EIS
Segment Number Proposed or Alternative Name Segment Length (miles) Formation Name 

Albion Range metamorphic rocks 

Dolomite of Cassia County Nounan Dolomite St. Charles Limestone Unknown quartzite Manning Canyon Shale Fish Haven Dolomite Garden City Formation Swan Peak Quartzite PreCambrian undifferentiated Permian Limestone Oquirrh Formation Snake River Basalt Quaternary undifferentiated (alluvial fan, gravel, loess) Basalt of Table Mountain Quaternary travertine Tertiary basalt Basalt of Table Mountain Idavada Volcanics Salt Lake Formation Starlight Formation Starlight and Salt Lake Formations, undifferentiated Rhyolitic lava Gneiss Unknown quartzite Pogonip Group - marble Swan Peak Quartzite PreCambrian undifferentiated Elba quartzite Oquirrh Formation Permian Limestone-includes Phosphoria Formation Upper Paleozoic, undifferentiated Quaternary undifferentiated (alluvium, gravel, loess) Laketown Dolomite Idavada Volcanics Salt Lake Formation Starlight Formation Tertiary lava and tuffs Goose Creek rhyolite ash flow tuffs Rhyolitic lava Quaternary undifferentiated (alluvium, gravel, fluvial, landslide) Bruneau Formation - basalt Bonneville flood deposits Snake River Basalt Bruneau Formation lake sediments Quaternary dune sand McKinney Basalt Glenns Ferry Formation Thousand Springs basalt Idaho Group sediments (fluvial, lacustrine, eolian) Wendell Grade Basalt Banbury Basalt Basalt, undifferentiated Chalky Volcanic field Poison Creek/Chalk Hills, undifferentiated Water 

Notes: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: PFYC - Potential Fossil Yield Classification

7

(cont.)

Proposed – Total Length

Alternative 7K

Proposed – Comparison portion for Alternative 7K

148.1131.5118.2

8

Notes: Footnote explanations are provided on the last page of this table

Table D.13-1. Paleontology Risk Factors for Proposed and Alternative Routes cont.

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), Pro

Table D.13-1 Page 9 of 13

Gateway West Transmission Line Final EIS
Segment Number Proposed or Alternative Name Segment Length (miles) Formation Name 

Quaternary undifferentiated (alluvium, landslide) 

Bruneau Formation - basalt Bruneau Formation lake sediments McKinney Basalt Glenns Ferry Formation Thousand Springs basalt Wendell Grade Basalt Banbury Basalt Quaternary undifferentiated (alluvium, landslide) Bruneau Formation - basalt Bruneau Formation lake sediments Bonneville flood deposits-Melon Gravel Idaho Group-Black Mesa Gravel Tuana Gravel Glenns Ferry Formation Thousand Springs basalt Wendell Grade Basalt Quaternary undifferentiated (alluvium, gravel, fluvial) Bonneville flood deposits Snake River Basalt Quaternary dune sand Glenns Ferry Formation Idaho Group sediments (fluvial, lacustrine, eolian) Basalt, undifferentiated Chalky Volcanic field Poison Creek/Chalk Hills, undifferentiated Water Quaternary undifferentiated (alluvium, gravel, fluvial) Bonneville flood deposits Snake River Basalt Glenns Ferry Formation Idaho Group sediments (fluvial, lacustrine, eolian) Poison Creek/Chalk Hills, undifferentiated Quaternary undifferentiated (alluvium, gravel, fluvial) Idaho Group sediments (fluvial, lacustrine, eolian) Quaternary undifferentiated (alluvium, gravel, fluvial) Idaho Group sediments (fluvial, lacustrine, eolian) Snake River Basalt Quaternary alluvium Snake River Basalt Idaho Group sediments (fluvial, lacustrine, eolian) Bonneville flood deposits Quaternary dune sand Snake River Basalt Glenns Ferry Formation Basalt, undifferentiated Water Snake River Basalt Quaternary landslide Glenns Ferry Formation Water 

Notes: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: PFYC - Potential Fossil Yield Classification

Alternative 8E

6.46.5

Alternative 8D

Alternative 8B

Proposed – Comparison portion for Alternative 8D Proposed – Comparison portion for Alternative 8C

Alternative 8A

45.818.3

Alternative 8C

53.651.945.3

6.9

Table D.13-1. Paleontology Risk Factors for Proposed and Alternative Routes cont.

Proposed – Comparison portion for Alternative 8B

8.1

Proposed – Comparison portion for Alternative 8E 7.0Proposed – Comparison portion for Alternative 8A

8

(cont.)

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), ProNotes: Footnote explanations are provided on the last page of this table

Table D.13-1 Page 10 of 13

Gateway West Transmission Line Final EIS
Segment Number Proposed or Alternative Name Segment Length (miles) Formation Name 

Quaternary alluvium 

Bruneau Formation-basalt Bruneau Formation lake sediments Quaternary Crowsnest Gravels Idaho Group-Black Mesa Gravel Bruneau Formation Tuana Gravel Glenns Ferry Formation Banbury Basalt Chalk Hills Formation Chalky Volcanic field Idavada Volcanics Snake River Basalt Poison Creek/Chalk Hills, undifferentiated Snake River Rhyolite Glenns Ferry Formation Banbury Basalt Quaternary alluvium Glenns Ferry Formation Banbury Basalt Idavada Volcanics Quaternary alluvium Bruneau Formation lake sediments Idaho Group-Black Mesa Gravel Tuana Gravel Glenns Ferry Formation Banbury Basalt Idavada Volcanics Quaternary alluvium Bruneau Formation - basalt Bruneau Formation lake sediments Idaho Group-Black Mesa Gravel Tuana Gravel Glenns Ferry Formation Banbury Basalt Idavada Volcanics Quaternary alluvium Banbury Basalt Idavada Volcanics Tuana Gravel Glenns Ferry Formation Banbury Basalt Idavada Volcanics Quaternary alluvium Bruneau Formation lake sediments Bruneau Formation Glenns Ferry Formation Chalk Hills Formation Snake River Basalt Poison Creek/Chalk Hills, undifferentiated 

Notes: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: PFYC - Potential Fossil Yield Classification

Proposed – Comparison portion for Alternative 9A 7.8

7.7

52.314.4

Proposed – Comparison portion for Alternatives 9D,F,G,H

Proposed – Comparison portion for Alternative 9C 14.4

Proposed - Total Length 162.2

Proposed – Comparison portion for Alternative 9B

Alternative 9AAlternative 9B

Alternative 9C

57.249.1

Notes: Footnote explanations are provided on the last page of this tableNotes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), Pro

Table D.13-1. Paleontology Risk Factors for Proposed and Alternative Routes cont.

9

Table D.13-1 Page 11 of 13

Gateway West Transmission Line Final EIS
Segment Number Proposed or Alternative Name Segment Length (miles) Formation Name 

Quaternary alluvium 

Bruneau Formation - basalt Snake River Basalt Bruneau Formation lake sediments Bonneville flood deposits-Melon Gravel Glenns Ferry Formation Poison Creek/Chalk Hills, undifferentiated Water Quaternary alluvium Bruneau Formation - Basalt Snake River Basalt Bruneau Formation lake sediments Bonneville flood deposits-Melon Gravel Bruneau Formation Glenns Ferry Formation Poison Creek/Chalk Hills, undifferentiated Water Quaternary alluvium Bruneau Formation - Basalt Snake River Basalt Bruneau Formation lake sediments Bonneville flood deposits-Melon Gravel Glenns Ferry Formation Poison Creek/Chalk Hills, undifferentiated Water Quaternary alluvium Bruneau Formation - Basalt Snake River Basalt Bruneau Formation lake sediments Bonneville flood deposits-Melon Gravel Bruneau Formation Glenns Ferry Formation Poison Creek/Chalk Hills, undifferentiated Water 

Notes: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: PFYC - Potential Fossil Yield Classification

9

(cont.)

Alternative 9D

60.2

Alternative 9H 61.0

Alternative 9F 63.3

Alternative 9G 57.8

Table D.13-1. Paleontology Risk Factors for Proposed and Alternative Routes cont.

Notes: Footnote explanations are provided on the last page of this tableNotes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), Pro

Table D.13-1 Page 12 of 13

Gateway West Transmission Line Final EIS
Segment Number Proposed or Alternative Name Segment Length (miles) Formation Name 

Quaternary alluvium 

Bruneau Formation lake sediments Bruneau Formation Glenns Ferry Formation Chalk Hills Formation Snake River Basalt Poison Creek/Chalk Hills, undifferentiated Quaternary alluvium Bruneau Formation lake sediments Idaho Group-Black Mesa Gravel Glenns Ferry Formation Banbury Basalt Chalk Hills Formation Idavada Volcanics Snake River Basalt Poison Creek/Chalk Hills, undifferentiated Quaternary alluvium Snake River Basalt Hansen Butte basalt Hazelton Butte basalt Skeleton Butte basalt Thousand Springs basalt Wendell Grade Basalt Idavada Volcanics 

Notes: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: PFYC - Potential Fossil Yield Classification1/ Quaternary sediments (alluvium, gravel, loess, landslides) were designated PFYC Class 3. They may have fit Class 2 (less than 10,000 years old). Idaho classes unconsolidated Pleistocene deposits as Cla2/ Quaternary dune sand designated as PFYC Class 2 -which includes recent aeolian deposits.3/ Iigneous, metamorphic, and PreCambrian rocks classified as PFYC Class 1-unless given a different formation-specific definition in Wyoming or Idaho.4/ Where multiple formations were grouped, the highest single PFYC Class was used for the entire group.5/ PFYC rankings for this formation were not designated in Wyoming or Idaho PFYC codes, and not readily defined by PFYC criteria (BLM, IM 2008-009).6/ Salt Lake Formation and Twin Creek Limestone classed as Class 3 in Wyoming and Class 3A in Idaho.7/ Thaynes Limestone and Phosphoria Formation classed as Class 3 in Wyoming and Class 5A in Idaho.8/ Nugget Sandstone classed as Class 3 in Wyoming and Class 2 in Idaho.9/ Bonneville flood deposits classed as Class 4A in Idaho Falls, Idaho district and Class 3A in Twin Falls district. Melon Gravel is classed as Class 3A in Boise district.10/ The Chalky Point locality was discussed in the Chalk Hills formation in Idaho PFYC literature. It is unknown if the Chalky volcanics is the same as Chalky Point. However, given similar nomenclature and pro11/ USGS includes the Idavada Volcanics as part of the Challis Volcanic Group, which is classed as Class 3A.12/ The Ankareh Formation is not mentioned in Idaho classifications, but classed as Class 3 in Wyoming.

9

(cont.)

10 Proposed – Total Length

Proposed - Comparison portion for Alternative 9E (revised)

Alternative 9E (revised)

61.434.470.6

Table D.13-1. Paleontology Risk Factors for Proposed and Alternative Routes cont.

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), Pro

Table D.13-1 Page 13 of 13

Gateway West Transmission Line Final EIS
Low Medium 

< 70 70 to 84 

1W(a) Proposed – Total Length 73.8 73.8Proposed – Comparison portion for Alternative 1W(a)-B 16.5 16.5Alternative 1W(a)-B 20.9 20.91W(c) Proposed – Total Length 73.6 73.6Proposed – Total Length 91.9 91.9Proposed – Compare to Alternative 2A 16.8 16.8Alternative 2A 16.0 16.0Proposed – Compare to Alternative 2B 12.5 12.5Alternative 2B 12.2 12.2Segment 3 Proposed – Total Length 45.9 45.9Segment 3A Proposed – Total Length 5.1 5.1Proposed – Total Length 197.6 89.6 16.5 Proposed – Compare to Alternatives 4B-4F 85.2 38.0 16.5 Alternative 4B 100.2 38.8 18.3 Alternative 4C 101.6 38.8 18.3 Alternative 4D 100.8 38.8 18.4 Alternative 4E 102.2 38.8 18.4 Alternative 4F 87.5 38.0 16.7 Proposed – Total Length 55.7 10.0 Proposed – Compare to Alternatives 5A,B 22.3 Alternative 5A 29.7 Alternative 5B 40.4 Proposed – Compare to Alternative 5C 32.9 4.3 Alternative 5C 26.0 2.9 Proposed – Compare to Alternative 5D 19.2 10.0 Alternative 5D 17.0 7.7 Proposed – Compare to Alternative 5E 5.8 5.8Alternative 5E 5.3 5.3

6 Proposed – Total Length 0.5 0.3 0.2

Notes: Proposed 8 (including 8B), Proposed 9 (including 9E), and Proposed 10Notes: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero miles or null value

1/ Alternative 4G was added in late 2012 and was therefore not added to this table

5

41/

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B

3

Table D.14-1. OPS Earthquake Hazard for Proposed and Alternative Routes

1W

2

Segment Number Proposed or Alternative Name

Segment Length 

(Miles)

Earthquake Zone Rank

Table D.14-1 Page 1 of 2

Gateway West Transmission Line Final EIS
Low Medium 

< 70 70 to 84 

Proposed – Total Length 118.2 41.2 31.2 Proposed – Compare to Alternatives 7A,B 35.1 1.0 Alternative 7A 37.7 0.9 Alternative 7B 46.2 0.9 Proposed – Compare to Alternative 7C 20.1 20.1Alternative 7C 20.3 20.3Proposed – Compare to Alternative 7D 6.2 1.3 4.9Alternative 7D 6.8 2.1 4.7Proposed – Compare to Alternative 7E 3.8 3.8Alternative 7E 4.5 4.5Proposed – Compare to Alternative 7F 10.5 10.5Alternative 7F 10.8 10.0 0.8Proposed – Compare to Alternative 7G 3.3 3.3Alternative 7G 3.4 3.4Proposed – Comparison portion for Alternative 7K 118.2 41.2 31.2 Alternative 7K 148.1 31.9 30.9 Proposed – Total Length 131.5 131.5Proposed – Compare to Alternative 8A 51.9 51.9Alternative 8A 53.6 53.6Proposed – Compare to Alternative 8B 45.3 45.3Alternative 8B 45.8 45.8Alternative 8B – Compare to Alternative 8C 6.5 6.5Alternative 8C 6.4 6.4Proposed – Compare to Alternative 8D 6.9 6.9Alternative 8D 8.1 8.1Proposed – Compare to Alternative 8E 7.0 7.0Alternative 8E 18.3 18.3Proposed – Total Length 162.2 162.2Proposed – Compare to Alternative 9A 7.8 7.8Alternative 9A 7.7 7.7Proposed – Compare to Alternative 9B 49.1 49.1Alternative 9B 52.3 52.3Proposed – Compare to Alternative 9C 14.4 14.4Alternative 9C 14.4 14.4Proposed – Compare to Alternative 9D,F,G,H 57.2 57.2Alternative 9D 60.1 60.1Alternative 9F 63.3 63.3Alternative 9G 57.8 57.8Alternative 9H 61.0 61.0Proposed – Compare to Alternative 9E (revised) 61.4 61.4Alternative 9E (revised) 70.6 70.6

10 Proposed – Total Length 34.4 34.4

Notes: Proposed 8 (including 8B), Proposed 9 (including 9E), and Proposed 10Notes: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero miles or null value

789

Table D.14-1. OPS Earthquake Hazard for Proposed and Alternative Routes cont.

Segment Number Proposed or Alternative Name

Segment Length 

(Miles)

Earthquake Zone Rank

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B

Table D.14-1 Page 2 of 2

Gateway West Transmission Line Final EIS
Magnitude 0.1 to 6 Magnitude 6.0 to 6.9 

1W(a) Proposed – Total Length 73.8 53.4

Proposed – Comparison portion for Alternative 1W(a)-B 16.5 16.5

Alternative 1W(a)-B 20.9 20.9

1W(c) Proposed – Total Length 73.6 49.7

Proposed – Total Length 91.9 85.7

Proposed – Comparison portion for Alternative 2A 16.8 16.8

Alternative 2A 16.0 16.0

Proposed – Comparison portion for Alternative 2B 12.5 12.5

Alternative 2B 12.2 12.2

Segment 3 Proposed – Total Length 45.9 30.0

Segment 3A Proposed – Total Length 5.1 5.1Proposed – Total Length 197.6 166.1 24.4Proposed – Comparison portion for Alternatives 4B-4F 85.2 66.4

Alternative 4B 100.2 82.2Alternative 4C 101.6 79.5Alternative 4D 100.8 82.8Alternative 4E 102.2 80.1Alternative 4F 87.5 64.9

Proposed – Total Length 55.7 7.3 49.0 

Proposed – Comparison portion for Alternatives 5A,B 22.3 22.3

Alternative 5A 29.7 29.7Alternative 5B 40.4 9.9 40.4

Proposed – Comparison portion for Alternative 5C 32.9 32.0

Alternative 5C 26.0 24.8Proposed – Comparison portion for Alternative 5D 19.2 12.5 Alternative 5D 17.0 13.0 Proposed – Comparison portion for Alternative 5E 5.8 

Alternative 5E 5.3 

6 Proposed – Total Length 0.5 0.3 

Notes: Proposed 8 (including 8B), Proposed 9 (including 9E), and Proposed 10Notes: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero miles or null value

1/ Alternative 4G was added in late 2012 and was therefore not added to this table

Buffered Mileage

41/

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B

35

Table D.14-2. Affected Miles by Earthquake Magnitude Buffers

1W

Segment Number Proposed or Alternative Name

2

Segment Length 

(Miles)

Table D.14-2 Page 1 of 2

Gateway West Transmission Line Final EIS
Magnitude 0.1 to 6 Magnitude 6.0 to 6.9 

Proposed – Total Length 118.2 6.8 58.9 

Proposed – Comparison portion for Alternatives 7A,B 35.1 35.1Alternative 7A 37.7 37.7Alternative 7B 46.2 11.1 46.2

Proposed – Comparison portion for Alternative 7C 20.1 7.0 Alternative 7C 20.3 10.4Proposed – Comparison portion for Alternative 7D 6.2Alternative 7D 6.8Proposed – Comparison portion for Alternative 7E 3.8Alternative 7E 4.5Proposed – Comparison portion for Alternative 7F 10.5Alternative 7F 10.8Proposed – Comparison portion for Alternative 7G 3.3Alternative 7G 3.4Proposed – Comparison portion for Alternative 7K 118.2 6.8 58.9 Alternative 7K 148.1 70.7 89.2Proposed – Total Length 131.5 27.4 Proposed – Comparison portion for Alternative 8A 51.9 27.4 Alternative 8A 53.6 25.8 Proposed – Comparison portion for Alternative 8B 45.3Alternative 8B 45.8Alternative 8B – Comparison portion for Alternative 8C 6.5Alternative 8C 6.4Proposed – Comparison portion for Alternative 8D 6.9Alternative 8D 8.1Proposed – Comparison portion for Alternative 8E 7.0Alternative 8E 18.3Proposed – Total Length 162.2Proposed – Comparison portion for Alternative 9A 7.8Alternative 9A 7.7Proposed – Comparison portion for Alternative 9B 49.1Alternative 9B 52.3 Proposed – Comparison portion for Alternative 9C 14.4Alternative 9C 14.4Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2Alternative 9D 60.1Alternative 9F 63.3Alternative 9G 57.8Alternative 9H 61.0Proposed – Comparison portion for Alternative 9E (revised) 61.4Alternative 9E (revised) 70.6

10 Proposed – Total Length 34.4 14.0 

Notes: Proposed 8 (including 8B), Proposed 9 (including 9E), and Proposed 10Notes: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero miles or null value

789

Segment Length 

(Miles)

Buffered Mileage

Table D.14-2. Affected Miles by Earthquake Magnitude Buffers cont.

Segment Number Proposed or Alternative Name

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B

Table D.14-2 Page 2 of 2

Gateway West Transmission Line Final EIS
Low Risk <70 Medium Ri

1W(a) Proposed – Total Length 73.8 69.5 

Proposed – Comparison portion for Alternative 1W(a)-B 16.5 16.5

Alternative 1W(a)-B 20.9 20.9

1W(c) Proposed – Total Length 73.6 69.9 

Proposed – Total Length 91.9 91.9

Proposed – Compare to Alternative 2A 16.8 16.8

Alternative 2A 16.0 16.0

Proposed – Compare to Alternative 2B 12.5 12.5

Alternative 2B 12.2 12.2

Segment 3 Proposed – Total Length 45.9 34.6 11.4

Segment 3A Proposed – Total Length 5.1 5.1Proposed – Total Length 197.6 143.9 13.Proposed – Compare to Alternatives 4B-4F 85.2 43.9 3.0 

Alternative 4B 100.2 50.1 5.0 Alternative 4C 101.6 46.5 16.Alternative 4D 100.8 50.1 5.0 Alternative 4E 102.2 46.5 16.Alternative 4F 87.5 43.9 2.4 

Proposed – Total Length 55.7 55.7Proposed – Compare to Alternatives 5A,B 22.3 22.3Alternative 5A 29.7 29.7Alternative 5B 40.4 40.4Proposed – Compare to Alternative 5C 32.9 32.9Alternative 5C 26.0 26.0Proposed – Compare to Alternative 5D 19.2 19.2Alternative 5D 17.0 17.0Proposed – Compare to Alternative 5E 5.8 5.8Alternative 5E 5.3 5.3

6 Proposed – Total Length 0.5 0.5

Notes: Proposed 9 (including 9E), and Proposed 10Notes: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero miles or null value

1/ Alternative 4G was added in late 2012 and was therefore not added to this table

Table D.14-3. Miles of Landslide Hazard Ranking Crossed by Alternative 

1W

25

Segment Number Proposed or Alternative Name

Segment Length 

(Miles)

Buffered Mi

41/

3

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B

Table D.14-3 Page 1 of 2

Gateway West Transmission Line Final EIS
Low Risk <70 Medium Ri

Proposed – Total Length 118.2 118.2Proposed – Compare to Alternatives 7A,B 35.1 35.1

Alternative 7A 37.7 37.7

Alternative 7B 46.2 46.2

Proposed – Compare to Alternative 7C 20.1 20.1

Alternative 7C 20.3 20.3

Proposed – Compare to Alternative 7D 6.2 6.2

Alternative 7D 6.8 6.8

Proposed – Compare to Alternative 7E 3.8 3.8

Alternative 7E 4.5 4.5

Proposed – Compare to Alternative 7F 10.5 10.5

Alternative 7F 10.8 10.8

Proposed – Compare to Alternative 7G 3.3 3.3

Alternative 7G 3.4 3.4

Proposed – Comparison portion for Alternative 7K 118.2 118.2

Alternative 7K 148.1 148.1Proposed – Total Length 131.5 124.3 7.2Proposed – Compare to Alternative 8A 51.9 47.1 4.8

Alternative 8A 53.6 53.6

Proposed – Compare to Alternative 8B 45.3 42.9 2.4

Alternative 8B 45.8 42.3 3.4

Alternative 8B – Compare to Alternative 8C 6.5 6.5

Alternative 8C 6.4 6.4

6.9

Alternative 8D 8.1 8.1

Proposed – Compare to Alternative 8E 7.0 4.6 2.4

Alternative 8E 18.3 18.3

Proposed – Total Length 162.2 162.2Proposed – Compare to Alternative 9A 7.8 7.8

Alternative 9A 7.7 7.7

Proposed – Compare to Alternative 9B 49.1 49.1

Alternative 9B 52.3 52.3

Proposed – Compare to Alternative 9C 14.4 14.4

Alternative 9C 14.4 14.4

Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 57.2Alternative 9D 60.1 60.1

Alternative 9F 63.3 63.3

Alternative 9G 57.8 57.8

Alternative 9H 61.0 61.0

Proposed – Compare to Alternative 9E (revised) 61.4 61.4

Alternative 9E (revised) 70.6 70.6

10 Seg 10 Proposed – Total Length 34.4 34.4

Notes: Proposed 9 (including 9E), and Proposed 10Notes: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero miles or null value

89

Table D.14-3. Miles of Landslide Hazard Ranking Crossed by Alternative cont.

Segment Number Proposed or Alternative Name

Segment Length 

(Miles)

Buffered Mi

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B

7

Table D.14-3 Page 2 of 2

Gateway West Transmission Line Final EIS
Table D.14-4 Page 1 of 2

Coal Oil and Gas Trona

Abandoned 

Underground 

Mines

Total Subsidence 

Potential Area1/

1W(a) Proposed – Total Length 73.8 775 43 9 43

Proposed – Comparison portion for Alternative 1W(a)-B 16.5 148 7 3 7

Alternative 1W(a)-B 20.9 271 34 18 38

1W(c) Proposed – Total Length 73.6 956 60 10 64

Proposed – Total Length 91.9 1,778 73 677 28 694

Proposed – Comparison portion for Alternative 2A 16.8 309 110 110

Alternative 2A 16.0 355 153 12 165

Proposed – Comparison portion for Alternative 2B 12.5 237 93 93

Alternative 2B 12.2 209 68 68

Segment 3 Proposed – Total Length 45.9 832 22 362 362

Segment 3A Proposed – Total Length 5.1 60 8 19 19

Proposed – Total Length 197.6 3,892 24 890 96 37 971

Proposed – Comparison portion for Alternatives 4B-4F 85.2 1,711 608 19 37 650

Alternative 4B 100.2 2,080 15 779 93 73 905

Alternative 4C 101.6 2,070 15 696 93 55 804

Alternative 4D 100.8 2,107 15 824 94 73 951

Alternative 4E 102.2 2,078 15 735 94 55 844

Alternative 4F 87.5 1,726 568 19 25 598

Proposed-Total Length 55.7 1,179

Proposed – Comparison portion for Alternatives 5A,B 22.3 461

Alternative 5A 29.7 644

Alternative 5B 40.4 842

Proposed – Comparison portion for Alternative 5C 32.9 731

Alternative 5C 26.0 509

Proposed – Comparison portion for Alternative 5D 19.2 484

Alternative 5D 17.0 416

Proposed – Comparison portion for Alternative 5E 5.8 174

Alternative 5E 5.3 165

6 Proposed-Total Length 0.5 65

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

Notes: Blank cells indicate zero acres or null value

1/ The Total Subsidence Potential Area is a GIS analysis of the dissolved area of all four categories. If categories overlap, the total area may be less than the sum of the categories.

2/ Alternative 4G was added in late 2012 and was therefore not added to this table

1W

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), Proposed 8 (including 8B), Proposed 9 (including 9E), and Proposed 10

Proposed Alternative or Route Name

Segment Length 

(Miles)

3

Total Disturbance Acreage

Table D.14-4. Acres of Construction Disturbance within Subsidence Areas

2

Mineral 

42/

Segment Number

5

Gateway West Transmission Line Final EIS
Table D.14-4 Page 2 of 2

Coal Oil and Gas Trona

Abandoned 

Underground 

Mines

Total Subsidence 

Potential Area

Proposed-Total Length 118.2 2,252

Proposed – Comparison portion for Alternatives 7A,B 35.1 652

Alternative 7A 37.7 774

Alternative 7B 46.2 920

Proposed – Comparison portion for Alternative 7C 20.1 372

Alternative 7C 20.3 362

Proposed – Comparison portion for Alternative 7D 6.2 132

Alternative 7D 6.8 153

Proposed – Comparison portion for Alternative 7E 3.8 72

Alternative 7E 4.5 96

Proposed – Comparison portion for Alternative 7F 10.5 225

Alternative 7F 10.8 213

Proposed – Comparison portion for Alternative 7G 3.3 64

Alternative 7G 3.4 87

Proposed – Comparison portion for Alternative 7K 118.2 2,249

Alternative 7K 148.1 2,859

Proposed – Total Length 131.5 2,518

Proposed – Comparison portion for Alternative 8A 51.9 963

Alternative 8A 53.6 978

Proposed – Comparison portion for Alternative 8B 45.3 899

Alternative 8B 45.8 916

Proposed – Comparison portion for Alternative 8C 6.5 163

Alternative 8C 6.4 140

Proposed – Comparison portion for Alternative 8D 6.9 147

Alternative 8D 8.1 174

Proposed – Comparison portion for Alternative 8E 7.0 124

Alternative 8E 18.3 334

Proposed – Total Length 162.2 3,293

Proposed – Comparison portion for Alternative 9A 7.8 147

Alternative 9A 7.7 162

Proposed – Comparison portion for Alternative 9B 49.1 1,037

Alternative 9B 52.3 965

Proposed – Comparison portion for Alternative 9C 14.4 304

Alternative 9C 14.4 320

Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 1,145

Alternative 9D 60.1 1,046

Alternative 9F 63.3 1,165

Alternative 9G 57.8 1,058

Alternative 9H 61.0 1,162

Proposed – Comparison portion for Alternative 9E (revised) 61.4 1,230

Alternative 9E (revised) 70.6 1,289

10 Proposed – Total Length 34.4 670

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

Notes: Blank cells indicate zero acres or null value

1/ The Total Subsidence Potential Area is a GIS analysis of the dissolved area of all four categories. If categories overlap, the total area may be less than the sum of the categories.

Total Disturbance Acreage

7

8

9

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), Proposed 8 (including 8B), Proposed 9 (including 9E), and Proposed 10

Segment Length

(Miles)

Table D.14-4. Acres of Construction Disturbance within Subsidence Areas cont.

Segment Number Proposed Alternative or Route Name

Mineral 

Gateway West Transmission Line Final EIS
Table D.14-5 Page 1 of 2

Coal Oil and Gas Trona

Abandoned 

Underground 

Mines

Total Subsidence 

Potential Area1/

1W(a) Proposed – Total Length 73.8 177 13 5 13

Proposed – Comparison portion for Alternative 1W(a)-B 16.5 27 1 0 1

Alternative 1W(a)-B 20.9 44 4 2 5

1W(c) Proposed – Total Length 73.6 124 12 12

Proposed – Total Length 91.9 245 9 78 6 82

Proposed – Comparison portion for Alternative 2A 16.8 28 11 11

Alternative 2A 16.0 40 19 1 21

Proposed – Comparison portion for Alternative 2B 12.5 21 8 8

Alternative 2B 12.2 17 8 8

Segment 3 Proposed – Total Length 45.9 140 3 46 46

Segment 3A Proposed – Total Length 5.1 12 1 4 4

Proposed – Total Length 197.6 530 3 115 9 6 126

Proposed – Comparison portion for Alternatives 4B-4F 85.2 213 81 2 6 87

Alternative 4B 100.2 273 2 109 12 9 125

Alternative 4C 101.6 265 2 94 12 7 107

Alternative 4D 100.8 280 2 118 12 9 134

Alternative 4E 102.2 269 2 101 12 7 114

Alternative 4F 87.5 214 80 2 3 83

Proposed-Total Length 55.7 169

Proposed – Comparison portion for Alternatives 5A,B 22.3 58

Alternative 5A 29.7 80

Alternative 5B 40.4 82

Proposed – Comparison portion for Alternative 5C 32.9 94

Alternative 5C 26.0 56

Proposed – Comparison portion for Alternative 5D 19.2 63

Alternative 5D 17.0 53

Proposed – Comparison portion for Alternative 5E 5.8 24

Alternative 5E 5.3 24

6 Proposed-Total Length 0.5 61

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

Notes: Blank cells indicate zero acres or null value

1/ The Total Subsidence Potential Area is a GIS analysi of the dissolved area of all four categories. If categories overlap, the total area may be less than the sum of the categories.

2/ Alternative 4G was added in late 2012 and was therefore not added to this table

Total Disturbance Acreage

42/

2

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), Proposed 8 (including 8B), Proposed 9 (including 9E), and Proposed 10

Table D.14-5. Acres of Operations Disturbance within Subsidence Areas

Mineral 

1W

Segment Number Proposed Alternative or Route Name

3

5

Segment Length

(Miles)

Gateway West Transmission Line Final EIS
Table D.14-5 Page 2 of 2

Coal Oil and Gas Trona

Abandoned 

Underground 

Mines

Total Subsidence 

Potential Area

Proposed-Total Length 118.2 265

Proposed – Comparison portion for Alternatives 7A,B 35.1 71

Alternative 7A 37.7 93

Alternative 7B 46.2 96

Proposed – Comparison portion for Alternative 7C 20.1 36

Alternative 7C 20.3 28

Proposed – Comparison portion for Alternative 7D 6.2 11

Alternative 7D 6.8 13

Proposed – Comparison portion for Alternative 7E 3.8 5

Alternative 7E 4.5 9

Proposed – Comparison portion for Alternative 7F 10.5 23

Alternative 7F 10.8 23

Proposed – Comparison portion for Alternative 7G 3.3 6

Alternative 7G 3.4 6

Proposed – Comparison portion for Alternative 7K 118.2 264

Alternative 7K 148.1 382

Proposed – Total Length 131.5 249

Proposed – Comparison portion for Alternative 8A 51.9 102

Alternative 8A 53.6 103

Proposed – Comparison portion for Alternative 8B 45.3 87

Alternative 8B 45.8 69

Proposed – Comparison portion for Alternative 8C 6.5 15

Alternative 8C 6.4 16

Proposed – Comparison portion for Alternative 8D 6.9 15

Alternative 8D 8.1 15

Proposed – Comparison portion for Alternative 8E 7.0 10

Alternative 8E 18.3 26

Proposed – Total Length 162.2 360

Proposed – Comparison portion for Alternative 9A 7.8 15

Alternative 9A 7.7 14

Proposed – Comparison portion for Alternative 9B 49.1 122

Alternative 9B 52.3 83

Proposed – Comparison portion for Alternative 9C 14.4 27

Alternative 9C 14.4 26

Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 106

Alternative 9D 60.1 84

Alternative 9F 63.3 93

Alternative 9G 57.8 87

Alternative 9H 61.0 96

Proposed – Comparison portion for Alternative 9E (revised) 61.4 116

Alternative 9E (revised) 70.6 135

10 Proposed – Total Length 34.4 74

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

Notes: Blank cells indicate zero acres or null value

7

8

9

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), Proposed 8 (including 8B), Proposed 9 (including 9E), and Proposed 10

Mineral 

Table D.14-5. Acres of Operations Disturbance within Subsidence Areas cont.

Segment Number Total Disturbance Acreage

Segment Length

Proposed Alternative or Route Name (Miles)

Gateway West Transmission Line Final EIS
1 to 4 4 to 8 8 to 12 T

1W(a) Proposed – Total Length 73.8 4.6 14.3 Proposed – Comparison portion for Alternative 1W(a)-B 16.5 3.3 Alternative 1W(a)-B 20.91W(c) Proposed – Total Length 73.6 7.1 13.7 Proposed – Total Length 91.9Proposed – Comparison portion for Alternative 2A 16.8Alternative 2A 16.0Proposed – Comparison portion for Alternative 2B 12.5Alternative 2B 12.2Segment 3 Proposed – Total Length 45.9 31.0 3.1 Segment 3A Proposed – Total Length 5.1 2.5 Proposed – Total Length 197.6 60.3 2.8 10.2 Proposed – Comparison portion for Alternatives 4B-4F 85.2 31.8 Alternative 4B 100.2 53.0 Alternative 4C 101.6 45.3 Alternative 4D 100.8 54.1 Alternative 4E 102.2 46.3 Alternative 4F 87.5 35.8 Proposed-Total Length 55.7 2.4 13.5 Proposed – Comparison portion for Alternatives 5A,B 22.3 2.4 11.1 Alternative 5A 29.7 5.4 10.5 Alternative 5B 40.4 2.6 14.9 Proposed – Comparison portion for Alternative 5C 32.9 2.4 10.3 Alternative 5C 26.0 2.4 1.5 Proposed – Comparison portion for Alternative 5D 19.2 2.4 Alternative 5D 17.0 1.5 Proposed – Comparison portion for Alternative 5E 5.8 1.0 Alternative 5E 5.3 0.7 

6 Proposed-Total Length 0.5 0.3 0.2 

Notes: Blank cells indicate zero miles or null value

1/ Alternative 4G was added in late 2012 and was therefore not added to this table

1W

2

Notes: Proposed 8 (including 8B), Proposed 9 (including 9E), and Proposed 10

Table D.14-6. Miles of Each Depth to Shallow Bedrock Category Crossed by Proposed and Alternative Routes

Segment Number Proposed Alternative or Route Name

Segment Length 

(Miles)

Depth to Bedrock (feet)

41/

5

Notes: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B

3

Table D.14-6 Page 1 of 2

Gateway West Transmission Line Final EIS
1 to 4 4 to 8 8 to 12 T

Proposed – Total Length 118.2 17.6 23.3 6.9 Proposed – Comparison portion for Alternatives 7A,B 35.1 2.4 10.8 Alternative 7A 37.7 5.4 10.3 Alternative 7B 46.2 2.2 15.0 Proposed – Comparison portion for Alternative 7C 20.1 12.0 Alternative 7C 20.3 10.2 Proposed – Comparison portion for Alternative 7D 6.2 2.2 0.8 Alternative 7D 6.8 3.2 0.8 Proposed – Comparison portion for Alternative 7E 3.8 1.1 2.7 Alternative 7E 4.5 0.1 4.4 Proposed – Comparison portion for Alternative 7F 10.5 3.7 6.1 Alternative 7F 10.8 1.4 5.9 Proposed – Comparison portion for Alternative 7G 3.3 1.0 Alternative 7G 3.4 0.2 Proposed – Comparison portion for Alternative 7K 118.2 17.6 23.3 6.9 Alternative 7K 148.1 11.8 37.1 14.5 Proposed – Total Length 131.5 25.3 77.1 10.2 Proposed – Comparison portion for Alternative 8A 51.9 12.3 22.2 5.5 Alternative 8A 53.6 12.0 24.5 4.9 Proposed – Comparison portion for Alternative 8B 45.3 13.0 20.6 4.6 Alternative 8B 45.8 1.6 24.4 8.5 Alternative 8B – Comparison portion for Alternative 8C 6.5 6.5 Alternative 8C 6.4 6.4 Proposed – Comparison portion for Alternative 8D 6.9 3.9 Alternative 8D 8.1 4.3 Proposed – Comparison portion for Alternative 8E 7.0 2.5 2.5 Alternative 8E 18.3 1.9 11.8 Proposed – Total Length 162.2 72.0 33.0 30.2 Proposed – Comparison portion for Alternative 9A 7.8 5.7 2.1 Alternative 9A 7.7 4.1 3.6 Proposed – Comparison portion for Alternative 9B 49.1 17.1 29.5 Alternative 9B 52.3 3.0 41.7 4.2 Proposed – Comparison portion for Alternative 9C 14.4 12.8 Alternative 9C 14.4 5.2 1.8 4.2 Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 43.3 5.0 Alternative 9D 60.1 12.4 7.8 Alternative 9F 63.3 19.7 7.8 Alternative 9G 57.8 9.2 11.1 Alternative 9H 61.0 16.5 11.1 Proposed – Comparison portion for Alternative 9E (revised) 61.4 44.0 8.6 Alternative 9E (revised) 70.6 54.0 8.7 

10 Proposed – Total Length 34.4 6.8 0.4 0.6 

Notes: Blank cells indicate zero miles or null valueNotes: Proposed 8 (including 8B), Proposed 9 (including 9E), and Proposed 10

Depth to Bedrock (feet)

Segment Number

Table D.14-6. Miles of Each Depth to Shallow Bedrock Category Crossed by Proposed and Alternative Routes cont.

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7BNotes: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactly

Proposed Alternative or Route Name

Segment Length 

(Miles)

789

Table D.14-6 Page 2 of 2

Gateway West Transmission Line Final EIS
Segment Number Proposed Alternative or Route Name

Segment Length 

(Miles) Bedrock/ Landslide1/ Bedrock/ Subsidence 

1W(a) Proposed – Total Length 73.8 0.6 Proposed – Comparison portion for Alternative 1W(a)-B 16.5Alternative 1W(a)-B 20.91W(c) Proposed – Total Length 73.6 0.5 Proposed – Total Length 91.9Proposed – Comparison portion for Alternative 2A 16.8Alternative 2A 16.0Proposed – Comparison portion for Alternative 2B 12.5Alternative 2B 12.2Segment 3 Proposed – Total Length 45.9 6.3 16.6 Segment 3A Proposed – Total Length 5.1 2.5 1.0 

Proposed – Total Length 197.6 34.6 28.8 

Proposed – Comparison portion for Alternatives 4B-4F 85.2 29.9 18.2 Alternative 4B 100.2 43.6 31.5 Alternative 4C 101.6 35.8 25.9 

Alternative 4D 100.8 44.6 33.0 

Alternative 4E 102.2 36.9 27.4 Alternative 4F 87.5 33.9 15.4 

Proposed-Total Length 55.7Proposed – Comparison portion for Alternatives 5A,B 22.3Alternative 5A 29.7Alternative 5B 40.4Proposed – Comparison portion for Alternative 5C 32.9Alternative 5C 26.0Proposed – Comparison portion for Alternative 5D 19.2Alternative 5D 17.0Proposed – Comparison portion for Alternative 5E 5.8Alternative 5E 5.3

6 Proposed-Total Length 0.5

Notes: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero miles or null value

1/ Landslide is defined as medium or high landslide hazards as shown on Table D.14-3.2/ Bedrock in all zones is a GIS analysis of the dissolved area of all three bedrock categories. If categories overlap, the distance may be less than the sum of the three numbers.

3/ Alternative 4G was added in late 2012 and was therefore not added to this table

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B

5

Table D.14-7. Miles of Shallow Bedrock in Landslide, Subsidence, or Coal (Methane) Zones

1W

2

43/

3

Table D.14-7 Page 1 of 2

Gateway West Transmission Line Final EIS
Segment Number Proposed Alternative or Route Name

Segment Length 

(Miles) Bedrock/ Landslide1/ Bedrock/ Subsidence 

Proposed-Total Length 118.2Proposed – Comparison portion for Alternatives 7A,B 35.1Alternative 7A 37.7Alternative 7B 46.2Proposed – Comparison portion for Alternative 7C 20.1Alternative 7C 20.3Proposed – Comparison portion for Alternative 7D 6.2Alternative 7D 6.8Proposed – Comparison portion for Alternative 7E 3.8Alternative 7E 4.5Proposed – Comparison portion for Alternative 7F 10.5Alternative 7F 10.8Proposed – Comparison portion for Alternative 7G 3.3Alternative 7G 3.4Proposed – Comparison portion for Alternative 7K 118.2Alternative 7K 148.1Proposed – Total Length 131.5 0.8 

Proposed – Comparison portion for Alternative 8A 51.9Alternative 8A 53.6Proposed – Comparison portion for Alternative 8B 45.3 0.8 

Alternative 8B 45.8 2.7 

Proposed – Comparison portion for Alternative 8C 6.5Alternative 8C 6.4Proposed – Comparison portion for Alternative 8D 6.9Alternative 8D 8.1Proposed – Comparison portion for Alternative 8E 7.0 0.8 Alternative 8E 18.3Proposed – Total Length 162.2

Proposed – Comparison portion for Alternative 9A 7.8Alternative 9A 7.7Proposed – Comparison portion for Alternative 9B 49.1Alternative 9B 52.3Proposed – Comparison portion for Alternative 9C 14.4Alternative 9C 14.4Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2Alternative 9D 60.1Alternative 9F 63.3Alternative 9G 57.8Alternative 9H 61.0Proposed – Comparison portion for Alternative 9E (revised) 61.4Alternative 9E (revised) 70.6

10 Proposed – Total Length 34.4

Notes: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero miles or null value

1/ Landslide is defined as medium or high landslide hazards as shown on Table D.14-3.2/ Bedrock in all zones is a GIS analysis of the dissolved area of all three bedrock categories. If categories overlap, the distance may be less than the sum of the three numbers.

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B

789

Table D.14-7. Miles of Shallow Bedrock in Landslide, Subsidence, or Coal (Methane) Zones cont.

Table D.14-7 Page 2 of 2

Gateway West Transmission Line Final EIS
Segment 

Number Proposed or Alternative Name

Segment

Length

(Miles) Total Acres

Highly Wind

Erodible

High K 

Factor

Slope 

> 25% 

Low T 

Factor

Prime 

Farmland

Compactio

Prone

1W(a) Proposed – Total Length 73.8 775 260 37 37 37 Proposed – Comparison portion for Alternative 1W(a)-B 16.5 148 108 24 24 24 

Alternative 1W(a)-B 20.9 271 98 5 5 5 1W(c) Proposed – Total Length 73.6 956 316 73 73 73 Proposed – Total Length 91.9 1,778 1,115 59 Proposed – Comparison portion for Alternative 2A 16.8 309 289 Alternative 2A 16.0 355 321 Proposed – Comparison portion for Alternative 2B 12.5 237 237 Alternative 2B 12.2 209 209 Segment 3 Proposed – Total Length 45.9 832 832 218 578 Segment 3A Proposed – Total Length 5.1 60 60 29 31 Proposed – Total Length 197.6 3,890 1,917 1,788 696 1,768 145 Proposed – Comparison portion for Alternatives 4B-4F 85.2 1,710 1,080 559 72 898 27 

Alternative 4B 100.2 2,080 1,356 808 1 1,195 24 Alternative 4C 101.6 2,070 1,355 819 1,049 24 

Alternative 4D 100.8 2,107 1,383 809 1 1,240 24 Alternative 4E 102.2 2,077 1,375 808 1,075 24 

Alternative 4F 87.5 1,725 1,109 577 135 972 27 

Proposed – Total Length 55.7 1,179 97 1,028 351 445 473 Proposed – Comparison portion for Alternatives 5A,B 22.3 461 18 396 255 254 29 

Alternative 5A 29.7 644 24 515 330 330 182 Alternative 5B 40.4 842 790 368 368 265 

Proposed – Comparison portion for Alternative 5C 32.9 731 18 666 268 268 292 

Alternative 5C 26.0 509 48 509 106 91 92 

Proposed – Comparison portion for Alternative 5D 19.2 484 79 404 37 85 390 Alternative 5D 17.0 416 72 343 3 55 337 Proposed – Comparison portion for Alternative 5E 5.8 174 79 95 48 126 Alternative 5E 5.3 165 90 74 42 122 

6 Proposed – Total Length 0.5 65 65 63 2 

Notes: Blank cells indicate zero acres or null value

1/ Alternative 4G was added in late 2012 and was therefore not added to this table

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 

Table D.15-1. Analysis of Soil Factors in Construction Disturbance Areas (in acres)

1W

41/

235

Table D.15-1 Page 1 of 2

Gateway West Transmission Line Final EIS
Segment 

Number Proposed or Alternative Name

Segment

Length

(Miles) Total Acres

Highly Wind

Erodible

High K 

Factor

Slope 

> 25% 

Low T 

Factor

Prime 

Farmland

Compactio

Prone

Proposed – Total Length 118.2 2,252 483 2,159 520 745 1,272 Proposed – Comparison portion for Alternatives 7A,B 35.1 652 14 594 278 241 254 

Alternative 7A 37.7 774 24 648 354 321 312 Alternative 7B 46.2 920 875 366 333 325 

Proposed – Comparison portion for Alternative 7C 20.1 372 34 372 232 287 Alternative 7C 20.3 362 12 361 <1 179 269 Proposed – Comparison portion for Alternative 7D 6.2 132 15 132 11 59 59 

Alternative 7D 6.8 153 25 153 11 82 82 

Proposed – Comparison portion for Alternative 7E 3.8 72 17 72 55 17 Alternative 7E 4.5 96 9 96 82 9 Proposed – Comparison portion for Alternative 7F 10.5 225 102 225 104 102 Alternative 7F 10.8 213 37 213 113 37 Proposed – Comparison portion for Alternative 7G 3.3 64 50 64 14 50Alternative 7G 3.4 87 77 87 10 77Proposed – Comparison portion for Alternative 7K 118.2 2,249 482 2,156 519 745 1,271 Alternative 7K 148.1 2,859 939 2,620 873 1,402 733 

Proposed – Total Length 131.5 2,518 691 1,842 2,062 486 Proposed – Comparison portion for Alternative 8A 51.9 963 580 337 637 359 Alternative 8A 53.6 978 644 332 283 244 Proposed – Comparison portion for Alternative 8B 45.3 899 110 849 769 126 Alternative 8B 45.8 916 238 859 700 422 

Alternative 8B – Comparison portion for Alternative 8C 6.5 163 163 163 Alternative 8C 6.4 140 139 139 Proposed – Comparison portion for Alternative 8D 6.9 147 147 87 7 Alternative 8D 8.1 174 174 98 8 Proposed – Comparison portion for Alternative 8E 7.0 124 59 93 93 59 

Alternative 8E 18.3 334 287 334 245 287 

Proposed – Total Length 162.2 3,293 1,486 1,588 33 2,131 1,062 Proposed – Comparison portion for Alternative 9A 7.8 147 86 147 61 

Alternative 9A 7.7 162 68 162 94 

Proposed – Comparison portion for Alternative 9B 49.1 1,037 138 885 407 40 Alternative 9B 52.3 965 210 700 205 135 

Proposed – Comparison portion for Alternative 9C 14.4 304 291 304 12 

Alternative 9C 14.4 320 39 225 280 133 

Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 1,145 973 273 953 293 

Alternative 9D 60.1 1,046 982 692 396 800 

Alternative 9F 63.3 1,165 1,094 699 524 790 

Alternative 9G 57.8 1,058 1,020 692 443 834 

Alternative 9H 61.0 1,162 1,125 692 564 817 

Proposed – Comparison portion for Alternative 9E (revised) 61.4 1,230 1,039 362 1,042 359 

Alternative 9E (revised) 70.6 1,289 770 709 1,095 383 

10 Proposed – Total Length 34.4 670 318 528 291 181 

990.4 18,268 7,640 9,349 1,710 8,224 3,476 145 

Notes: Blank cells indicate zero acres or null valueNotes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, Total of All Proposed Segments (grey shaded areas)

Table D.15-1. Analysis of Soil Factors in Construction Disturbance Areas (in acres) cont.

789

Table D.15-1 Page 2 of 2

Gateway West Transmission Line Final EIS
Highly Wind

Erodible

High K 

Factor

Slope 

> 25% 

Low T 

Factor

Prime 

Farmland

Compaction

Prone

Stony/ 

Rocky

Droughty 

Soil

Shallow 

Bedrock

Hydric 

Soil

1W(a) Proposed – Total Length 73.8 177 58 6 6 6 6 64 6 177

Proposed – Comparison portion for Alternative 1W(a)-B 16.5 27 20 4 4 4 4 24 4 27

Alternative 1W(a)-B 20.9 44 15 1 1 1 1 16 1 44

1W(c) Proposed – Total Length 73.6 124 40 8 8 8 8 48 8 124

Proposed – Total Length 91.9 245 121 7 121 245

Proposed – Comparison portion for Alternative 2A 16.8 28 27 27 28

Alternative 2A 16.0 40 37 37 40

Proposed – Comparison portion for Alternative 2B 12.5 21 21 21 21

Alternative 2B 12.2 17 17 17 17

Segment 3 Proposed – Total Length 45.9 140 140 76 60 63 57 140

Segment 3A Proposed – Total Length 5.1 12 12 3 9 9 9 12

Proposed – Total Length 197.6 529 279 277 92 228 12 139 316 141 16 529

Proposed – Comparison portion for Alternatives 4B-4F 85.2 212 137 69 10 111 2 73 142 90 6 212

Alternative 4B 100.2 273 185 109 <1 157 2 83 190 146 7 273

Alternative 4C 101.6 265 188 99 138 2 74 180 127 6 265

Alternative 4D 100.8 280 192 109 <1 166 2 85 191 154 7 280

Alternative 4E 102.2 269 195 96 142 2 72 177 132 6 269

Alternative 4F 87.5 214 142 74 23 127 2 61 130 106 7 214

Proposed – Total Length 55.7 169 22 138 47 92 49 80 100 9 169

Proposed – Comparison portion for Alternatives 5A,B 22.3 58 2 49 37 37 4 37 37 9 58

Alternative 5A 29.7 80 2 62 50 50 18 50 50 18 80

Alternative 5B 40.4 82 86 46 46 22 46 46 6 92

Proposed – Comparison portion for Alternative 5C 32.9 94 2 84 37 37 37 37 37 9 94

Alternative 5C 26.0 56 4 55 14 12 9 12 12 6 55

Proposed – Comparison portion for Alternative 5D 19.2 63 20 43 3 21 40 3 23 63

Alternative 5D 17.0 53 21 32 1 21 28 1 22 53

Proposed – Comparison portion for Alternative 5E 5.8 24 20 4 19 5 20 24

Alternative 5E 5.3 24 21 4 18 6 21 24

6 Proposed – Total Length 0.5 61 61 60 1 61 28 61

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

Notes: Blank cells indicate zero acres or null value

1/ Alternative 4G was added in late 2012 and was therefore not added to this table

Table D.15-2. Analysis of Soil Factors in Operations Disturbance Areas (in acres)

1W

4

1/

2

3

Proposed or Alternative Name

Segment 

Number

5

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), Proposed 8 (including 8B), Proposed 9 (including 9E), and Proposed 10

Factors Affecting Reclamation

Permanent 

Soil Loss

Total 

Acres

Segment

Length

(Miles)

Erosion Factors Sensitive Soils

Table D.15-2 Page 1 of 2

Gateway West Transmission Line Final EIS
Highly Wind

Erodible

High K 

Factor

Slope 

> 25% 

Low T 

Factor

Prime 

Farmland

Compaction

Prone

Stony/ 

Rocky

Droughty 

Soil

Shallow 

Bedrock

Hydric 

Soil

Proposed – Total Length 118.2 265 39 253 68 128 113 99 130 40 265

Proposed – Comparison portion for Alternatives 7A,B 35.1 71 2 64 38 35 20 38 38 7 71

Alternative 7A 37.7 93 3 74 51 49 28 51 51 19 93

Alternative 7B 46.2 96 91 44 42 28 44 44 5 96

Proposed – Comparison portion for Alternative 7C 20.1 36 3 36 25 30 25 25 36

Alternative 7C 20.3 28 <1 28 15 21 15 15 28

Proposed – Comparison portion for Alternative 7D 6.2 11 2 11 1 4 4 1 4 4 11

Alternative 7D 6.8 13 3 13 1 5 5 1 6 5 13

Proposed – Comparison portion for Alternative 7E 3.8 5 1 5 4 1 4 4 5

Alternative 7E 4.5 9 <1 9 7 <1 7 7 9

Proposed – Comparison portion for Alternative 7F 10.5 23 9 23 11 9 11 11 23

Alternative 7F 10.8 23 6 23 12 6 12 12 23

Proposed – Comparison portion for Alternative 7G 3.3 6 4 6 2 4 6

Alternative 7G 3.4 6 5 6 <1 5 6

Proposed – Comparison portion for Alternative 7K 118.2 264 39 253 68 128 113 99 130 40 264

Alternative 7K 148.1 382 109 349 115 211 77 139 175 30 381

Proposed – Total Length 131.5 249 78 173 207 44 <1 156 61 248

Proposed – Comparison portion for Alternative 8A 51.9 102 70 28 71 34 78 36 102

Alternative 8A 53.6 103 73 30 41 23 2 78 33 103

Proposed – Comparison portion for Alternative 8B 45.3 87 7 85 76 11 <1 36 24 87

Alternative 8B 45.8 69 10 68 55 27 21 <1 69

Alternative 8B – Comparison portion for Alternative 8C 6.5 15 15 15 5 15

Alternative 8C 6.4 16 16 16 3 16

Proposed – Comparison portion for Alternative 8D 6.9 15 15 8 1 7 15

Alternative 8D 8.1 15 15 8 2 6 15

Proposed – Comparison portion for Alternative 8E 7.0 10 5 8 8 5 3 4 10

Alternative 8E 18.3 26 21 26 20 21 2 4 26

Proposed – Total Length 162.2 360 149 187 4 223 99 51 183 145 360

Proposed – Comparison portion for Alternative 9A 7.8 15 10 15 5 5 5 10 15

Alternative 9A 7.7 14 6 14 8 8 8 6 14

Proposed – Comparison portion for Alternative 9B 49.1 122 22 100 37 3 3 25 34 122

Alternative 9B 52.3 83 18 59 16 11 12 28 4 83

Proposed – Comparison portion for Alternative 9C 14.4 27 26 27 t

2/ 3 3 24 27

Alternative 9C 14.4 26 2 17 24 11 12 12 12 26

Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 106 89 27 91 25 79 81 106

Alternative 9D 60.1 84 76 58 32 63 27 20 84

Alternative 9F 63.3 93 85 58 44 60 36 32 93

Alternative 9G 57.8 87 85 60 37 70 28 15 87

Alternative 9H 61.0 96 94 60 49 67 38 28 96

Proposed – Comparison portion for Alternative 9E (revised) 61.4 116 95 37 101 31 79 85 116

Alternative 9E (revised) 70.6 135 85 72 115 43 63 93 135

10 Proposed – Total Length 34.4 74 37 50 49 13 10 35 24 74

990.4 2,405 1,036 1,178 225 1,070 319 12 393 1,286 528 16 2,404

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

Notes: Blank cells indicate zero acres or null value

2/ "t" indicates only a trace amount (<0.1 acre) of impact

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), Proposed 8 (including 8B), Proposed 9 (including 9E), and Proposed 10

Segment 

Number

7

8

9

Total of All Proposed Segments (grey shaded areas)

Table D.15-2. Analysis of Soil Factors in Operations Disturbance Areas (in acres) cont.

Proposed or Alternative Name

Factors Affecting Reclamation

Permanent 

Soil Loss

Segment

Length

(Miles)

Total 

Acres

Erosion Factors Sensitive Soils

Table D.15-2 Page 2 of 2

Gateway West Transmission Line Final EIS
Medicine Bow-Routt National Forests

1W(a) Proposed – Total Length 775 161W(c) Proposed – Total Length 956 24

1,731 40

Caribou-Targhee National Forest

Proposed – Total Length 3,890 148 148 8 

Proposed – Comparison Portion for Alternative 4G 30 30 7 Alternative 4G 40 48 2 

Sawtooth National Forest

Proposed – Comparison portion for Alternative 7K 2,246 <1 <1

Alternative 7K 2,855 230 123 227

Notes: Proposed 8 (including 8B), Proposed 9 (including 9E), and Proposed 10Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

Table D.15-3. Soil Impacts on National Forest-Construction Areas (in acres)

Segment 

Number Proposed or Alternative Name Total Segment Acres Total National Forest Acres Highly Erodible Soil (High K Factor) Low Soil Loss Tolerance (Low T Factor) hhm1/ 

7

1W

Total of All Medicine Bow NF Segments (grey shaded areas)

4

1/ "hhm" means two of the three soils in the map unit have a high erosion hazard and one has moderate hazard. Between 50 and 75 percent of the area has high hazard.2/ "hmm" means only one of the three soils has a high erosion hazard with the remaining in moderate hazard. These areas have less than 50 percent in high erosion hazard.Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 

Table D.15-3 Page 1 of 1

Gateway West Transmission Line Final EIS
Medicine Bow-Routt National Forests

1W(a) Proposed – Total Length 177 3 31W(c) Proposed – Total Length 124 3 3

301 6 6

Caribou-Targhee National Forest

4 Proposed – Total Length 529 19 19 19 

Proposed – Comparison portion for Alternative 4G 5 

Alterntive 4G

Sawtooth National Forest

Proposed – Comparison portion for Alternative 7K 264 t1/ t1/ t1/

Alternative 7K 381 38 21 37 38

Notes: Proposed 8 (including 8B), Proposed 9 (including 9E), and Proposed 10Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

Permanent Soil 

Loss

Total of All Medicine Bow NF Segments (grey shaded areas)

7

Proposed or Alternative Name Segment Number Total Segment Acres Highly Erodible Soil (High K Factor)

2/ "hhm" means two of the three soils in the map unit have a high erosion hazard and one has moderate hazard. Between 50 and 75 percent of the area has high hazard.3/ "hmm" means only one of the three soils has a high erosion hazard with the remaining in moderate hazard. These areas have less than 50 percent in high erosion hazard.

Table D.15-4. Soil Impacts on National Forest-Operations Areas (in acres)

1W

Total Forest Acres

Low Soil Loss 

Tolerance 

(Low T Factor)

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B

1/ "t" indicates only a trace amount (<0.1 acre) of impact

Table D.15-4 Page 1 of 1

Gateway West Transmission Line Final EIS
Table D.16-1. Surface Water Road Crossings by Crossing Type 

Drive 

Through Cut/Fill TMDL/ 303(d) Drive Through Cut/Fill Temporary Culvert TMDL/ 303(d) Avoid Temporary Culvert 

1W(a) Proposed – Total Length 73.8 230 81 74 12 27 28 Proposed – Comparison portion for Alternative 1W(a)-B 16.5 31 5 4 3 8 6 Alternative 1W(a)-B 20.9 23 6 5 4 8 

1W(c) Proposed – Total Length 73.6 185 70 51 13 29 10 Proposed – Total Length 91.9 192 96 68 2 4 8 1 

Proposed – Comparison portion for Alternative 2A 16.8 31 16 11 1 2 Alternative 2A 16.0 45 23 17 3 2 Proposed – Comparison portion for Alternative 2B 12.5 24 12 8 1 2 Alternative 2B 12.2 21 12 8 1 Segment 3 Proposed – Total Length 45.9 96 39 25 6 13 3 Segment 3A Proposed – Total Length 5.1 12 7 3 1 1 

Proposed – Total Length 197.6 442 123 100 5 37 85 17 

Proposed – Comparison portion for Alternatives 4B-4F 85.2 242 63 52 1 23 55 10 

Alternative 4B 100.2 375 137 112 1 13 31 50 

Alternative 4C 101.6 354 131 106 1 14 32 43 

Alternative 4D 100.8 413 158 129 1 13 31 50 

Alternative 4E 102.2 387 149 121 1 14 32 43 

Alternative 4F 87.5 220 60 49 1 16 36 4 Proposed – Total Length 55.7 170 71 31 61 Proposed – Comparison portion for Alternatives 5A,B 22.3 77 20 9 47 

Alternative 5A 29.7 78 19 8 21 4 3 2 12 Alternative 5B 40.4 96 37 16 21 7 4 1 3 Proposed – Comparison portion for Alternative 5C 32.9 145 65 28 51 Alternative 5C 26.0 52 21 9 17 1 1 

Proposed – Comparison portion for Alternative 5D 19.2 75 47 20 6 

Alternative 5D 17.0 51 27 11 6 2 2 

Proposed – Comparison portion for Alternative 5E 5.8 5 31 

Alternative 5E 5.3 6 42 

6 Proposed – Total Length 0.5

Notes: Blank cells indicate zero acres or null value

2/ Estimated Disturbance Acres are in addition to the disturbance area of the road that would be needed for stream crossings

Segment 

Number Proposed or Alternative Name

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, an

4/ "t" indicates only a trace amount (<0.1 acre) of disturbance

Total 

Crossings1/

Segment 

Length 

(Miles)

Intermittent W

3

45/

5

5/ Alternative 4G was added in late 2012 and was therefore not added to this table

Intermittent Dry

3/ These nine crossings are not all perennial, some will require a permanent culvert

Ephemeral 

1/ The number of crossings are based on the disturbance acres for each stream crossing type and have been rounded to the nearest whole number; therefore numbers are inexact and columns/rows 

1W

Number of Crossings

2

Table D.16-1 Page 1 of 2

Gateway West Transmission Line Final EIS
Table D.16-1. Surface Water Road Crossings by Crossing Type cont.

Drive 

Through Cut/Fill TMDL/ 303(d) Drive Through Cut/Fill Temporary Culvert TMDL/ 303(d) Avoid Temporary Culvert 

Proposed – Total Length 118.2 259 56 74 51 2 11 3 

Proposed – Comparison portion for Alternatives 7A,B 35.1 82 16 22 44 

Alternative 7A 37.7 106 20 26 22 2 8 5 12 Alternative 7B 46.2 98 24 31 23 2 9 1 Proposed – Comparison portion for Alternative 7C 20.1 17 3 5 Alternative 7C 20.3 24 10 12 1 

Proposed – Comparison portion for Alternative 7D 6.2 17 4 6 1 2 

Alternative 7D 6.8 17 4 5 2 Proposed – Comparison portion for Alternative 7E 3.8 5 Alternative 7E 4.5 7 Proposed – Comparison portion for Alternative 7F 10.5 32 3 4 1 6 1 Alternative 7F 10.8 19 3 5 1 5 1 Proposed – Comparison portion for Alternative 7G 3.3 4 2 2 Alternative 7G 3.4 0Proposed – Comparison portion for Alternative 7K 118.2 259 56 74 51 2 11 3 

Alternative 7K 148.1 494 137 179 30 11 59 1 9 Proposed – Total Length 131.5 266 114 56 19 7 15 2 1 

Proposed – Comparison portion for Alternative 8A 51.9 59 16 11 1 1 2 

Alternative 8A 53.6 54 9 7 1 1 2 2 Proposed – Comparison portion for Alternative 8B 45.3 116 47 33 18 3 6 2 Alternative 8B 45.8 71 21 15 28 1 2 

Proposed – Comparison portion for Alternative 8C 6.5 18 8 5 2 1 2 

Alternative 8C 6.4 21 11 7 2 1 

Proposed – Comparison portion for Alternative 8D 6.9 10 2 1 5 Alternative 8D 8.1 9 2 23 

Proposed – Comparison portion for Alternative 8E 7.0 6 1 

Alternative 8E 18.3 14 7 5 1 1 

Proposed – Total Length 162.2 322 106 84 17 3 6 7 6 15 

Proposed – Comparison portion for Alternative 9A 7.8 16 4 3 

Alternative 9A 7.7 14 1 1 

Proposed – Comparison portion for Alternative 9B 49.1 70 20 16 10 1 3 4 5 6 Alternative 9B 52.3 57 20 15 6 Proposed – Comparison portion for Alternative 9C 14.4 27 13 11 

Alternative 9C 14.4 21 4 3 1 

Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 136 45 35 1 1 2 

Alternative 9D 60.1 42 21 17 3 

Alternative 9F 63.3 57 27 21 3 

Alternative 9G 57.8 35 17 14 3 

Alternative 9H 61.0 50 23 18 3 

Proposed – Comparison portion for Alternative 9E (revised) 61.4 136 45 35 1 1 2 Alternative 9E (revised) 70.6 109 44 35 19 1 

10 Proposed – Total Length 34.4 26 8 5 3 

Notes: Blank cells indicate zero acres or null value

2/ Estimated Disturbance Acres are in addition to the disturbance area of the road that would be needed for stream crossings3/ These nine crossings are not all perennial, some will require a permanent culvert (pertains to Segment 2 on page 1 of this table)

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

7

Total 

Crossings1/

Ephemeral 

Segment 

Length 

(Miles)

Segment 

Number

Intermittent Dry 

Number of Crossings

1/ The number of crossings are based on the disturbance acres for each stream crossing type and have been rounded to the nearest whole number; therefore numbers are inexact and columns/rows 

Proposed or Alternative Name

4/ "t" indicates only a trace amount (<0.1 acre) of disturbance

89

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, an

Intermittent W

Table D.16-1 Page 2 of 2

Gateway West Transmission Line Final EIS
Table D.16-2. Potential Construction Disturbance (in Acres per Risk Rank) In Areas of Flood Hazard Risk 

0 to 69 70 to 84 85 to 100

Low Risk Moderate Risk High Risk

1W(a) Proposed – Total Length 73.8 689 26 61

Proposed – Comparison portion for Alternative 1W(a)-B 16.5 117 14 17

Alternative 1W(a)-B 20.9 229 15 28

1W(c) Proposed – Total Length 73.6 893 5 59

Proposed – Total Length 91.9 1,579 35 167

Proposed – Comparison portion for Alternative 2A 16.8 251 4 54

Alternative 2A 16.0 262 93

Proposed – Comparison portion for Alternative 2B 12.5 193 4 40

Alternative 2B 12.2 139 2 68

Segment 3 Proposed – Total Length 45.9 771 63

Segment 3A Proposed – Total Length 5.1 60

Proposed – Total Length 197.6 3,269 355 273

Proposed – Comparison portion for Alternatives 4B-4F 85.2 1,271 245 198

Alternative 4B 100.2 1,577 321 185

Alternative 4C 101.6 1,618 302 153

Alternative 4D 100.8 1,602 321 186

Alternative 4E 102.2 1,625 302 154

Alternative 4F 87.5 1,329 201 198

Proposed – Total Length 55.7 745 307 127

Proposed – Comparison portion for Alternatives 5A,B 22.3 412 7 42

Alternative 5A 29.7 521 45 78

Alternative 5B 40.4 719 43 80

Proposed – Comparison portion for Alternative 5C 32.9 450 223 59

Alternative 5C 26.0 331 88 90

Proposed – Comparison portion for Alternative 5D 19.2 92 300 92

Alternative 5D 17.0 37 214 165

Proposed – Comparison portion for Alternative 5E 5.8 13 93 68

Alternative 5E 5.3 13 97 55

6 Proposed – Total Length 0.5 44 21

Notes: Blank cells indicate zero acres or null value

Notes: Proposed 8 (including 8B), Proposed 9 (including 9E), and Proposed 10

1/ Alternative 4G was added in late 2012 and was therefore not added to this table

Segment Number Proposed or Alternative Name

1W

4

1/

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G),

Flood Hazard Rank

5

2

Segment Length (Miles)

3

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

Table D.16-2 Page 1 of 2

Gateway West Transmission Line Final EIS
Table D.16-2. Potential Construction Disturbance (in Acres per Risk Rank) In Areas of Flood Hazard Risk cont.

0 to 69 70 to 84 85 to 100

Low Risk Moderate Risk High Risk

Proposed – Total Length 118.2 1,806 245 200

Proposed – Comparison portion for Alternatives 7A,B 35.1 428 124 101

Alternative 7A 37.7 594 89 92

Alternative 7B 46.2 712 83 125

Proposed – Comparison portion for Alternative 7C 20.1 250 48 74

Alternative 7C 20.3 254 75 33

Proposed – Comparison portion for Alternative 7D 6.2 94 35 3

Alternative 7D 6.8 104 40 9

Proposed – Comparison portion for Alternative 7E 3.8 72

Alternative 7E 4.5 96

Proposed – Comparison portion for Alternative 7F 10.5 225

Alternative 7F 10.8 213

Proposed – Comparison portion for Alternative 7G 3.3 64

Alternative 7G 3.4 87

Proposed – Comparison portion for Alternative 7K 118.2 1,804 245 200

Alternative 7K 148.1 2,723 24 112

Proposed – Total Length 131.5 2,134 56 328

Proposed – Comparison portion for Alternative 8A 51.9 816 18 128

Alternative 8A 53.6 833 22 123

Proposed – Comparison portion for Alternative 8B 45.3 745 23 131

Alternative 8B 45.8 721 195

Proposed – Comparison portion for Alternative 8C 6.5 163

Alternative 8C 6.4 140

Proposed – Comparison portion for Alternative 8D 6.9 95 52

Alternative 8D 8.1 89 85

Proposed – Comparison portion for Alternative 8E 7.0 93 31

Alternative 8E 18.3 291 17 27

Proposed – Total Length 162.2 2,664 267 363

Proposed – Comparison portion for Alternative 9A 7.8 147

Alternative 9A 7.7 162

Proposed – Comparison portion for Alternative 9B 49.1 848 58 130

Alternative 9B 52.3 802 8 155

Proposed – Comparison portion for Alternative 9C 14.4 187 59 58

Alternative 9C 14.4 206 8 106

Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 885 91 168

Alternative 9D 60.1 874 62 111

Alternative 9F 63.3 921 90 154

Alternative 9G 57.8 876 34 147

Alternative 9H 61.0 924 63 176

Proposed – Comparison portion for Alternative 9E (revised) 61.4 941 91 198

Alternative 9E (revised) 70.6 999 108 182

10 Proposed – Total Length 34.4 630 41

Notes: Blank cells indicate zero acres or null value

Notes: Proposed 8 (including 8B), Proposed 9 (including 9E), and Proposed 10

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G),

Segment Length (Miles)

8

7

9

Flood Hazard Rank

Segment Number Proposed or Alternative Name

Table D.16-2 Page 2 of 2

Gateway West Transmission Line Final EIS
Table D.16-3. Potential Operations (in Acres per Risk Rank) Disturbance In Areas of Flood Hazard Risk

0 to 69 70 to 

Low Risk Moderate 

1W(a) Proposed – Total Length 73.8 143 10 

Proposed – Comparison portion for Alternative 1W(a)-B 16.5 21 3 

Alternative 1W(a)-B 20.9 37 3 

1W(c) Proposed – Total Length 73.6 105 <1 

Proposed – Total Length 91.9 179 4 

Proposed – Comparison portion for Alternative 2A 16.8 19 1 

Alternative 2A 16.0 26 

Proposed – Comparison portion for Alternative 2B 12.5 13 1 

Alternative 2B 12.2 12 t1/ 

Segment 3 Proposed – Total Length 45.9 134 6Segment 3A Proposed – Total Length 5.1 12Proposed – Total Length 197.6 465 39 Proposed – Comparison portion for Alternatives 4B-4F 85.2 164 27 Alternative 4B 100.2 215 35 Alternative 4C 101.6 213 32 Alternative 4D 100.8 222 35 Alternative 4E 102.2 216 32 Alternative 4F 87.5 172 22 Proposed – Total Length 55.7 120 37 Proposed – Comparison portion for Alternatives 5A,B 22.3 52 2 Alternative 5A 29.7 60 7 Alternative 5B 40.4 79 6 Proposed – Comparison portion for Alternative 5C 32.9 57 27 Alternative 5C 26.0 38 7 Proposed – Comparison portion for Alternative 5D 19.2 21 36 Alternative 5D 17.0 16 24 Proposed – Comparison portion for Alternative 5E 5.8 12 10 Alternative 5E 5.3 12 10 

6 Proposed – Total Length 0.5 42 18

Notes: Blank cells indicate zero acres or null value

Segment Number Proposed or Alternative Name

Flood Haza

Segment Length (Miles)

3

42/

1W

52

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B

1/ "t" indicates only a trace amount (<0.1 acre) of impact2/ Alternative 4G was added in late 2012 and was therefore not added to this table

Table D.16-3 Page 1 of 2

Gateway West Transmission Line Final EIS
Table D.16-3. Potential Operations (in Acres per Risk Rank) Disturbance In Areas of Flood Hazard Risk cont.

0 to 69 70 to 

Low Risk Moderate 

Proposed – Total Length 118.2 226 18 

Proposed – Comparison portion for Alternatives 7A,B 35.1 52 7 

Alternative 7A 37.7 70 9 

Alternative 7B 46.2 79 8 

Proposed – Comparison portion for Alternative 7C 20.1 27 4 

Alternative 7C 20.3 20 5 

Proposed – Comparison portion for Alternative 7D 6.2 82Alternative 7D 6.8 83Proposed – Comparison portion for Alternative 7E 3.8 5Alternative 7E 4.5 9Proposed – Comparison portion for Alternative 7F 10.5 23Alternative 7F 10.8 23Proposed – Comparison portion for Alternative 7G 3.3 6

Alternative 7G 3.4 6Proposed – Comparison portion for Alternative 7K 118.2 226 18 

Alternative 7K 148.1 369 4 

Proposed – Total Length 131.5 210 8 

Proposed – Comparison portion for Alternative 8A 51.9 88 4 

Alternative 8A 53.6 93 1 

Proposed – Comparison portion for Alternative 8B 45.3 70 3 

Alternative 8B 45.8 53 

Proposed – Comparison portion for Alternative 8C 6.5 15Alternative 8C 6.4 16Proposed – Comparison portion for Alternative 8D 6.9 10 

Alternative 8D 8.1 8 Proposed – Comparison portion for Alternative 8E 7.0 7 Alternative 8E 18.3 23 2 

Proposed – Total Length 162.2 296 27 

Proposed – Comparison portion for Alternative 9A 7.8 15Alternative 9A 7.7 14Proposed – Comparison portion for Alternative 9B 49.1 106 5 

Alternative 9B 52.3 73 1 

Proposed – Comparison portion for Alternative 9C 14.4 19 5 

Alternative 9C 14.4 19 <1 

Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 82 9 

Alternative 9D 60.1 69 5 

Alternative 9F 63.3 75 7 

Alternative 9G 57.8 74 3 

Alternative 9H 61.0 80 5 

Proposed – Comparison portion for Alternative 9E (revised) 61.4 86 9 

Alternative 9E (revised) 70.6 98 12 

10 Proposed – Total Length 34.4 69 

Notes: Blank cells indicate zero acres or null value

Flood Haza

Segment Number Proposed or Alternative Name Segment Length (Miles)

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

789

Table D.16-3 Page 2 of 2

Gateway West Transmission Line Final EIS
Table D.16-5. Surface Water Diversions Within One-Half Mile Buffer of Transmission Lines

Segment 

Number Proposed or Alternative Name

Segment Length 

(Miles)

Surface Water 

Diversions

Segment 

Number Proposed or Alternative Name

Segment Length 

(Miles)

Surface Water 

Diversions

1W(a) Proposed – Total Length 73.8 3 Proposed – Total Length 118.2 693

Proposed – Comparison portion for Alternative 1W(a)-B 16.5 0 Proposed – Comparison portion for Alternatives 7A,B 35.1 46

Alternative 1W(a)-B 20.9 0 Alternative 7A 37.7 59

1W(c) Proposed – Total Length 73.6 2 Alternative 7B 46.2 31

Proposed – Total Length 91.9 0 Proposed – Comparison portion for Alternative 7C 20.1 57

Proposed – Comparison portion for Alternative 2A 16.8 0 Alternative 7C 20.3 113

Alternative 2A 16.0 0 Proposed – Comparison portion for Alternative 7D 6.2 67

Proposed – Comparison portion for Alternative 2B 12.5 0 Alternative 7D 6.8 63

Alternative 2B 12.2 0 Proposed – Comparison portion for Alternative 7E 3.8 10

Segment 3 Proposed – Total Length 45.9 0 Alternative 7E 4.5 7

Segment 3A Proposed – Total Length 5.1 0 Proposed – Comparison portion for Alternative 7F 10.5 56

Proposed – Total Length 197.6 127 Alternative 7F 10.8 14

Proposed – Comparison portion for Alternatives 4B-4F 85.2 10 Proposed – Comparison portion for Alternative 7G 3.3 63

Alternative 4B 100.2 22 Alternative 7G 3.4 66

Alternative 4C 101.6 21 Proposed – Comparison portion for Alternative 7K 118.2 693

Alternative 4D 100.8 21 Alternative 7K 148.1 311

Alternative 4E 102.2 20 Proposed – Total Length 131.5 324

Alternative 4F 87.5 10 Proposed – Comparison portion for Alternative 8A 51.9 169

Proposed – Total Length 55.7 119 Alternative 8A 53.6 591

Proposed – Comparison portion for Alternatives 5A,B 22.3 30 Proposed – Comparison portion for Alternative 8B 45.3 78

Alternative 5A 29.7 26 Alternative 8B 45.8 239

Alternative 5B 40.4 28 Proposed – Comparison portion for Alternative 8C 6.5 11

Proposed – Comparison portion for Alternative 5C 32.9 29 Alternative 8C 6.4 23

Alternative 5C 26.0 29 Proposed – Comparison portion for Alternative 8D 6.9 0

Proposed – Comparison portion for Alternative 5D 19.2 25 Alternative 8D 8.1 119

Alternative 5D 17.0 98 Proposed – Comparison portion for Alternative 8E 7.0 10

Proposed – Comparison portion for Alternative 5E 5.8 21 Alternative 8E 18.3 11

Alternative 5E 5.3 17 9 Proposed – Total Length 162.2 562

6 Proposed – Total Length 0.5 5 Proposed – Comparison portion for Alternative 9A 7.8 16

Alternative 9A 7.7 19

Alternative 9B 52.3 144

Notes: Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), Proposed 8 (including 8B), Proposed – Comparison portion for Alternative 9C 14.4 16

Notes: Proposed 9 (including 9E), and Proposed 10 Alternative 9C 14.4 55

Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 308

Alternative 9D 60.1 140

Alternative 9F 63.3 184

Alternative 9G 57.8 134

Alternative 9H 61.0 178

Proposed – Comparison portion for Alternative 9E (revised) 61.4 317

Alternative 9E (revised) 70.6 189

10 Proposed – Total Length 34.4 169

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G),

1/ Alternative 4G was added in late 2012 and was therefore not added to this table

7

8

1W

3

Source: IDWR

2

4

1/

5

Table D.16-5 Page 1 of 1

Gateway West Transmission Line Final EIS
Table D.16-6. Number of Surface Water Road Crossings by Stream Type

Non-listed

Sediment-Impaired

Temperature - 

Impaired

Non-listed

Sediment-Impaired

Non-listed

Sediment-Impaired

Temperature - 

Impaired

Non-listed

Sediment-Impaired

Temperature - 

1W(a) Proposed – Total Length 73.8 3 28 39 155 Proposed – Comparison portion for Alternative 1W(a)-B 16.5 6 11 9 Alternative 1W(a)-B 20.9 12 11 1W(c) Proposed – Total Length 73.6 6 10 42 121 Proposed – Total Length 91.9 10 1 13 164 

Proposed – Comparison portion for Alternative 2A 16.8 4 27 Alternative 2A 16.0 2 3 40 

Proposed – Comparison portion for Alternative 2B 12.5 4 20 

Alternative 2B 12.2 1 20 

Segment 3 Proposed – Total Length 45.9 10 3 19 64 

Segment 3A Proposed – Total Length 5.1 2 2 10 

Proposed – Total Length 197.6 50 8 1 17 122 223 5 

Proposed – Comparison portion for Alternatives 4B-4F 85.2 25 10 78 115 1 

Alternative 4B 100.2 13 50 44 249 1 

Alternative 4C 101.6 11 43 45 237 1 

Alternative 4D 100.8 13 50 44 287 1 

Alternative 4E 102.2 11 43 45 270 1 

Alternative 4F 87.5 44 4 52 109 1 

Proposed – Total Length 55.7 102 61 

Proposed – Comparison portion for Alternatives 5A,B 22.3 29 47 Alternative 5A 29.7 8 12 7 2 27 21 Alternative 5B 40.4 7 3 11 1 53 21 Proposed – Comparison portion for Alternatives 5C 32.9 93 51 Alternative 5C 26.0 2 30 17 

Proposed – Comparison portion for Alternatives 5D 19.2 67 6 

Alternative 5D 17.0 4 38 6 

Proposed – Comparison portion for Alternatives 5E 5.8 4 

Alternative 5E 5.3 5 

6 Proposed – Total Length 0.5

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, Notes: Blank cells indicate null valueNotes: SI = sediment-impaired; TI = temperature-impaired

1/ Artificial = pipe, aqueduct, canal, drain, ditch or artificial path (natural stream channelized into pipe, ditch or culvert)2/ The number of crossings are based on the disturbance acres for each stream crossing type and have been rounded to the nearest whole number; therefore numbers are inexact and column3/ Alternative 4G was added in late 2012 and was therefore not added to this table

3

43/

5

2

Segment Length 

Proposed or Alternative Name (Miles)

Perennial

Intermittent - 

Wet Intermittent - Dry Ephemeral

Segment 

Number

1W

Table D.16-6 Page 1 of 2

Gateway West Transmission Line Final EIS
Table D.16-6. Number of Surface Water Road Crossings by Stream Type cont.

Non-listed

Sediment-Impaired

Temperature - 

Impaired

Non-listed

Sediment-Impaired

Non-listed

Sediment-Impaired

Temperature - 

Impaired

Non-listed

Sediment-Impaired

Temperature - 

Proposed – Total Length 118.2 18 1 3 1 13 130 51 

Proposed – Comparison portion for Alternatives 7A,B 35.1 38 44 

Alternative 7A 37.7 10 12 10 5 46 22 

Alternative 7B 46.2 8 1 11 55 23 Proposed – Comparison portion for Alternative 7C 20.1 1 8 Alternative 7C 20.3 1 22 

Proposed – Comparison portion for Alternative 7D 6.2 2 1 10 

Alternative 7D 6.8 2 9 

Proposed – Comparison portion for Alternative 7E 3.8 5 

Alternative 7E 4.5 7 Proposed – Comparison portion for Alternative 7F 10.5 17 1 7 7 

Alternative 7F 10.8 4 1 6 8 Proposed – Comparison portion for Alternative 7G 3.3 4 Alternative 7G 3.4

Proposed – Comparison portion for Alternative 7K 118.2 18 1 3 1 13 130 51 

Alternative 7K 148.1 46 1 9 70 1 316 22 Proposed – Total Length 131.5 12 1 1 22 2 170 16 

Proposed – Comparison portion for Alternative 8A 51.9 8 3 27 1 Alternative 8A 53.6 4 3 2 16 1 Proposed – Comparison portion for Alternative 8B 45.3 9 2 80 15 

Alternative 8B 45.8 1 2 36 26 

Proposed – Comparison portion for Alternative 8C 6.5 1 2 13 2 Alternative 8C 6.4 1 18 2 Proposed – Comparison portion for Alternative 8D 6.9 3 4 

Alternative 8D 8.1 4 2 Proposed – Comparison portion for Alternative 8E 7.0 1 Alternative 8E 18.3 2 12 

Proposed – Total Length 162.2 4 2 15 16 5 1 190 14 

Proposed – Comparison portion for Alternative 9A 7.8 2 7 Alternative 9A 7.7 1 4 1 2 Proposed – Comparison portion for Alternative 9B 49.1 2 6 8 5 36 10 Alternative 9B 52.3 2 35 6 Proposed – Comparison portion for Alternative 9C 14.4 24 

Alternative 9C 14.4 1 7 1 

Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 1 2 1 1 80 

Alternative 9D 60.1 38 3 

Alternative 9F 63.3 48 3 

Alternative 9G 57.8 31 3 

Alternative 9H 61.0 41 3 

Proposed – Comparison portion for Alternative 9E (revised) 61.4 1 2 1 1 80 Alternative 9E (revised) 70.6 7 1 1 79 12 

10 Proposed – Total Length 34.4 3 85 

141 11 1 83 2 288 10 1 1,337 152 

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, Notes: Blank cells indicate null valueNotes: SI = sediment-impaired; TI = temperature-impairedSource: DEQ

1/ Artificial = pipe, aqueduct, canal, drain, ditch or artificial path (natural stream channelized into pipe, ditch or culvert)2/ The number of crossings are based on the disturbance acres for each stream crossing type and have been rounded to the nearest whole number; therefore numbers are inexact and column

Total of Proposed Only2/

789

Intermittent - 

Perennial Intermittent - Dry Ephemeral Wet 

Segment 

Number Proposed or Alternative Name

Segment Length 

(Miles)

Table D.16-6 Page 2 of 2

Gateway West Transmission Line Final EIS
Table D.16-7. Potential Construction Disturbance (in Acres per Depth Range) in Areas Containing Shallow Groundwater

1 to 4 feet 4 to 7 feet 7 to 10 feet 

1W(a) Proposed – Total Length 73.8 

Proposed – Comparison portion for Alternative 1W(a)-B 16.5 

Alternative 1W(a)-B 20.9 1W(c) Proposed – Total Length 73.6 

Proposed – Total Length 91.9 

Proposed – Comparison portion for Alternative 2A 16.8 Alternative 2A 16.0 

Proposed – Comparison portion for Alternative 2B 12.5 

Alternative 2B 12.2 

Segment 3 Proposed – Total Length 45.9 

Segment 3A Proposed – Total Length 5.1 

Proposed – Total Length 197.6 205 28 

Proposed – Comparison portion for Alternatives 4B-4F 85.2 86 28 Alternative 4B 100.2 88 72 Alternative 4C 101.6 67 56 Alternative 4D 100.8 88 53 Alternative 4E 102.2 67 37 Alternative 4F 87.5 85 28 Proposed – Total Length 55.7 18 

Proposed – Comparison portion for Alternatives 5A,B 22.3 18 

Alternative 5A 29.7 24 

Alternative 5B 40.4 

Proposed – Comparison portion for Alternatives 5C 32.9 18 

Alternative 5C 26.0 35 

Proposed – Comparison portion for Alternatives 5D 19.2 

Alternative 5D 17.0 

Proposed – Comparison portion for Alternatives 5E 5.8 

Alternative 5E 5.3 

6 Proposed – Total Length 0.5 

Notes: Blank cells indicate zero acres or null value

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 

1/ Alternative 4G was added in late 2012 and was therefore not added to this table

3

Depth to Ground

1W

2

41/

5

Segment Number Proposed or Alternative Name Segment Length (Miles)

Table D.16-7 Page 1 of 2

Gateway West Transmission Line Final EIS
Table D.16-7. Potential Construction Disturbance (in Acres per Depth Range) in Areas Containing Shallow Groundwater cont.

1 to 4 feet 4 to 7 feet 7 to 10 feet 

Proposed – Total Length 118.2 28 14 Proposed – Comparison portion for Alternatives 7A,B 35.1 28 14 

Alternative 7A 37.7 15 25 

Alternative 7B 46.2 32 Proposed – Comparison portion for Alternative 7C 20.1 

Alternative 7C 20.3 

Proposed – Comparison portion for Alternative 7D 6.2 

Alternative 7D 6.8 

Proposed – Comparison portion for Alternative 7E 3.8 

Alternative 7E 4.5 

Proposed – Comparison portion for Alternative 7F 10.5 

Alternative 7F 10.8 

Proposed – Comparison portion for Alternative 7G 3.3 Alternative 7G 3.4 

Proposed – Comparison portion for Alternative 7K 118.2 28 14 Alternative 7K 148.1 2 

Proposed – Total Length 131.5 

Proposed – Comparison portion for Alternative 8A 51.9 

Alternative 8A 53.6 

Proposed – Comparison portion for Alternative 8B 45.3 

Alternative 8B 45.8 

Proposed – Comparison portion for Alternative 8C 6.5 

Alternative 8C 6.4 

Proposed – Comparison portion for Alternative 8D 6.9 

Alternative 8D 8.1 

Proposed – Comparison portion for Alternative 8E 7.0 

Alternative 8E 18.3 

Proposed – Total Length 162.2 

Proposed – Comparison portion for Alternative 9A 7.8 

Alternative 9A 7.7 

Proposed – Comparison portion for Alternative 9B 49.1 Alternative 9B 52.3 

Proposed – Comparison portion for Alternative 9C 14.4 

Alternative 9C 14.4 

Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 

Alternative 9D 60.1 

Alternative 9F 63.3 

Alternative 9G 57.8 

Alternative 9H 61.0 

Proposed – Comparison portion for Alternative 9E (revised) 61.4 

Alternative 9E (revised) 70.6 

10 Proposed – Total Length 34.4 

Source: STATSGONotes: Blank cells indicate zero acres or null valueNotes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

Segment Number Proposed or Alternative Name 

89

Depth to Ground

Segment Length (Miles)

7

Table D.16-7 Page 2 of 2

Gateway West Transmission Line Final EIS
Table D.16-8. Potential Operations Disturbance (in Acres per Depth Range) in Areas Containing Shallow Groundwater

1 to 4 feet 4 to 7 feet 7 to 10 feet 

1W(a) Proposed – Total Length 73.8 

Proposed – Comparison portion for Alternative 1W(a)-B 16.5 Alternative 1W(a)-B 20.9 1W(c) Proposed – Total Length 73.6 

Proposed – Total Length 91.9 

Proposed – Comparison portion for Alternative 2A 16.8 Alternative 2A 16.0 Proposed – Comparison portion for Alternative 2B 12.5 Alternative 2B 12.2 Segment 3 Proposed – Total Length 45.9 

Segment 3A Proposed – Total Length 5.1 Proposed – Total Length 197.6 16 3 

Proposed – Comparison portion for Alternatives 4B-4F 85.2 6 3 Alternative 4B 100.2 7 7 Alternative 4C 101.6 6 6 Alternative 4D 100.8 7 6 Alternative 4E 102.2 6 4 Alternative 4F 87.5 7 3 Proposed – Total Length 55.7 2 

Proposed – Comparison portion for Alternatives 5A,B 22.3 2 

Alternative 5A 29.7 2 

Alternative 5B 40.4 Proposed – Comparison portion for Alternatives 5C 32.9 2 

Alternative 5C 26.0 3 

Proposed – Comparison portion for Alternatives 5D 19.2 Alternative 5D 17.0 Proposed – Comparison portion for Alternatives 5E 5.8 Alternative 5E 5.3 

6 Proposed – Total Length 0.5 

Notes: Blank cells indicate zero acres or null value

2

41/

3

Segment Number Proposed or Alternative Name Segment Length (Miles) 

5

1W

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

Depth to Groundw

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D

1/ Alternative 4G was added in late 2012 and was therefore not added to this table

Table D.16-8 Page 1 of 2

Gateway West Transmission Line Final EIS
Table D.16-8. Potential Operations Disturbance (in Acres per Depth Range) in Areas Containing Shallow Groundwater cont.

1 to 4 feet 4 to 7 feet 7 to 10 feet 

Proposed – Total Length 118.2 2 2 Proposed – Comparison portion for Alternatives 7A,B 35.1 2 2 Alternative 7A 37.7 1 3 Alternative 7B 46.2 2 

Proposed – Comparison portion for Alternative 7C 20.1 Alternative 7C 20.3 Proposed – Comparison portion for Alternative 7D 6.2 Alternative 7D 6.8 Proposed – Comparison portion for Alternative 7E 3.8 Alternative 7E 4.5 Proposed – Comparison portion for Alternative 7F 10.5 Alternative 7F 10.8 Proposed – Comparison portion for Alternative 7G 3.3 Alternative 7G 3.4 Proposed – Comparison portion for Alternative 7K 118.2 2 2 Alternative 7K 148.1 0 

Proposed – Total Length 131.5 

Proposed – Comparison portion for Alternative 8A 51.9 

Alternative 8A 53.6 

Proposed – Comparison portion for Alternative 8B 45.3 Alternative 8B 45.8 Proposed – Comparison portion for Alternative 8C 6.5 Alternative 8C 6.4 Proposed – Comparison portion for Alternative 8D 6.9 Alternative 8D 8.1 Proposed – Comparison portion for Alternative 8E 7.0 Alternative 8E 18.3 Proposed – Total Length 162.2 

Proposed – Comparison portion for Alternative 9A 7.8 Alternative 9A 7.7 Proposed – Comparison portion for Alternative 9B 49.1 

Alternative 9B 52.3 Proposed – Comparison portion for Alternative 9C 14.4 Alternative 9C 14.4 

Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 

Alternative 9D 60.1 Alternative 9F 63.3 Alternative 9G 57.8 Alternative 9H 61.0 Proposed – Comparison portion for Alternative 9E (revised) 61.4 

Alternative 9E (revised) 70.6 

10 Proposed – Total Length 34.4 

Source: STATSGONotes: Blank cells indicate zero acres or null value

Segment Length (Miles)

Depth to Groundw

Proposed or Alternative Name

7

Segment Number 

89

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7DNotes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

Table D.16-8 Page 2 of 2

Gateway West Transmission Line Final EIS
Table D.16-10. Potable Water Wells within One-Half Mile of Transmission Lines

Segment 

Number Proposed or Alternative Name

Segment Length 

(Miles) Potable Water Wells

Segment 

Number Propose

1W(a) Proposed – Total Length 73.8 24 Proposed – Total Length Proposed – Comparison portion for Alternative 1W(a)-B 16.5 22 Proposed – Comparison p

Alternative 1W(a)-B 20.9 37 Alternative 7A 

1W(c) Proposed – Total Length 73.6 56 Alternative 7B 

Proposed – Total Length 91.9 7 Proposed – Comparison pProposed – Comparison portion for Alternative 2A 16.8 6 Alternative 7C 

Alternative 2A 16.0 4 Proposed – Comparison p

Proposed – Comparison portion for Alternative 2B 12.5 5 Alternative 7D Alternative 2B 12.2 12 Proposed – Comparison pSegment 3 Proposed – Total Length 45.9 6 Alternative 7E Segment 3A Proposed – Total Length 5.1 Proposed – Comparison p

Proposed – Total Length 197.6 36 Alternative 7F 

Proposed – Comparison portion for Alternatives 4B-4F 85.2 4 Proposed – Comparison pAlternative 4B 100.2 11 Alternative 7G Alternative 4C 101.6 15 Proposed – Comparison pAlternative 4D 100.8 7 Alternative 7K 

Alternative 4E 102.2 11 Proposed – Total Length 

Alternative 4F 87.5 7 Proposed – Comparison p

Proposed – Total Length 55.7 40 Alternative 8A 

Proposed – Comparison portion for Alternatives 5A,B 22.3 7 Proposed – Comparison pAlternative 5A 29.7 4 Alternative 8B 

Alternative 5B 40.4 7 Proposed – Comparison pProposed – Comparison portion for Alternatives 5C 32.9 8 Alternative 8C Alternative 5C 26.0 4 Proposed – Comparison pProposed – Comparison portion for Alternatives 5D 19.2 10 Alternative 8D Alternative 5D 17.0 28 Proposed – Comparison pProposed – Comparison portion for Alternatives 5E 5.8 9 Alternative 8E Alternative 5E 5.3 7 Proposed – Total Length 

6 Proposed – Total Length 0.5 4 Proposed – Comparison p

Alternative 9A Proposed – Comparison p

Notes: Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), Proposed 8 (including 8B), Alternative 9B Notes: Proposed 9 (including 9E), and Proposed 10 Proposed – Comparison p

Alternative 9C Proposed – Comparison pAlternative 9D Alternative 9F Alternative 9G Alternative 9H Proposed – Comparison p

Alternative 9E (revised) 

10 Proposed – Total Length 

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G),

1/ Alternative 4G was added in late 2012 and was therefore not added to this table

879

2

41/

1W

Source: IDWR

53

Table D.16-10 Page 1 of 1

Gateway West Transmission Line Final EIS
Table D.16-11. Miles of the Eastern Snake River Plain Aquifer Crossed by Proposed and Alternative Routes

1W(a) Proposed – Total Length 73.8 Proposed – Total Length 118.2 28.7

Proposed – Comparison portion for Alternative 1W(a)-B 16.5 Proposed – Comparison portion for Alternatives 7A,B 35.1

Alternative 1W(a)-B 20.9 Alternative 7A 37.7

1W(c) Proposed – Total Length 73.6 Alternative 7B 46.2

Proposed – Total Length 91.9 Proposed – Comparison portion for Alternative 7C 20.1

Proposed – Comparison portion for Alternative 2A 16.8 Alternative 7C 20.3

Alternative 2A 16.0 Proposed – Comparison portion for Alternative 7D 6.2

Proposed – Comparison portion for Alternative 2B 12.5 Alternative 7D 6.8

Alternative 2B 12.2 Proposed – Comparison portion for Alternative 7E 3.8 3.6

Segment 3 Proposed – Total Length 45.9 Alternative 7E 4.5 0.7

Segment 3A Proposed – Total Length 5.1 Proposed – Comparison portion for Alternative 7F 10.5 5.0

Proposed – Total Length 197.6 Alternative 7F 10.8

Proposed – Comparison portion for Alternatives 4B-4F 85.2 Proposed – Comparison portion for Alternative 7G 3.3 1.4

Alternative 4B 100.2 Alternative 7G 3.4 2.7

Alternative 4C 101.6 Proposed – Comparison portion for Alternative 7K 118.2 28.7

Alternative 4D 100.8 Alternative 7K 148.1 1.0

Alternative 4E 102.2 Proposed – Total Length 131.5 42.3

Alternative 4F 87.5 Proposed – Comparison portion for Alternative 8A 51.9 42.3

Proposed – Total Length 55.7 3.1 Alternative 8A 53.6 24.5

Proposed – Comparison portion for Alternatives 5A,B 22.3 Proposed – Comparison portion for Alternative 8B 45.3

Alternative 5A 29.7 Alternative 8B 45.8

Alternative 5B 40.4 Proposed – Comparison portion for Alternative 8C 6.5

Proposed – Comparison portion for Alternatives 5C 32.9 Alternative 8C 6.4

Alternative 5C 26.0 Proposed – Comparison portion for Alternative 8D 6.9

Proposed – Comparison portion for Alternatives 5D 19.2 3.1 Alternative 8D 8.1

Alternative 5D 17.0 2.6 Proposed – Comparison portion for Alternative 8E 7.0

Proposed – Comparison portion for Alternatives 5E 5.8 3.1 Alternative 8E 18.3

Alternative 5E 5.3 2.7 Proposed – Total Length 162.2 8.4

6 Proposed – Total Length 0.5 0.5 Proposed – Comparison portion for Alternative 9A 7.8 5.4

Alternative 9A 7.7 2.6

Notes: Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), Proposed 8 (including 8B), Proposed – Comparison portion for Alternative 9B 49.1

Notes: Proposed 9 (including 9E), and Proposed 10

Notes: not sum exactly

Notes: Blank cells indicate zero miles or null value Alternative 9B 52.3

Proposed – Comparison portion for Alternative 9C 14.4

Alternative 9C 14.4

Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2

Alternative 9D 60.1

Alternative 9F 63.3

Alternative 9G 57.8

Alternative 9H 61.0

Proposed – Comparison portion for Alternative 9E (revised) 61.4

Alternative 9E (revised) 70.6

10 Proposed – Total Length 34.4 34.4

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G),

1/ Alternative 4G was added in late 2012 and was therefore not added to this table

8

Miles of Eastern 

Snake River 

Plain Aquifer 

Segment 

Number Proposed or Alternative Name

5

Segment Length 

(Miles)

1W

Segment 

Number Proposed or Alternative Name

Segment Length 

(Miles)

Miles of Eastern 

Snake River 

Plain Aquifer 

2

4

1/

Notes: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may

7

3

9

Table D.16-11 Page 1 of 1

Gateway West Transmission Line Final EIS
Table D.16-12. Estimated Transmission Line Construction Water Requirements per Segment 

Total Water Requirement 

(gallons) 

1W(a) Proposed – Total Length 73.8 1,726,656 

Proposed – Comparison portion for Alternative 1W(a)-B 16.5 385,410 Alternative 1W(a)-B 20.9 487,930 

1W(c) Proposed – Total Length 73.6 1,561,498 

Proposed – Total Length 91.9 2,728,139 

Proposed – Comparison portion for Alternative 2A 16.8 498,794 Alternative 2A 16.0 473,825 

Proposed – Comparison portion for Alternative 2B 12.5 371,073 Alternative 2B 12.2 361,706 Segment 3 Proposed – Total Length 45.9 1,667,196 

Segment 3A Proposed – Total Length 5.1 157,100 Proposed – Total Length 197.6 5,884,609 

Proposed – Comparison portion for Alternatives 4B-4F 85.2 2,536,493 

Alternative 4B 100.2 2,984,146 

Alternative 4C 101.6 3,026,851 

Alternative 4D 100.8 3,002,133 

Alternative 4E 102.2 3,044,838 

Alternative 4F 87.5 2,607,177 

Proposed – Total Length 55.7 1,614,478 

Proposed – Comparison portion for Alternatives 5A,B 22.3 647,670 

Alternative 5A 29.7 862,476 

Alternative 5B 40.4 1,172,666 

Proposed – Comparison portion for Alternatives 5C 32.9 953,947 

Alternative 5C 26.0 753,426 

Proposed – Comparison portion for Alternatives 5D 19.2 556,881 

Alternative 5D 17.0 494,375 

Proposed – Comparison portion for Alternatives 5E 5.8 167,262 Alternative 5E 5.3 153,373 

6 Proposed – Total Length 0.5 65,897 

3

7.89.29.3

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 

1/ Alternative 4G was added in late 2012 and was therefore not added to this table

Total Water 

Requirement

1.11.50.60.5

Proposed or Alternative Name

Segment Length 

(Miles) (acre-feet)

2

Segment Number

5.31.21.58.0

1W

4.88.4

18.1

1.51.15.1

41/

9.29.3

5

5.02.02.63.62.92.31.71.50.50.2

Table D.16-12 Page 1 of 2

Gateway West Transmission Line Final EIS
Table D.16-12. Estimated Transmission Line Construction Water Requirements per Segment cont.

Total Water Requirement 

(gallons) 

Proposed – Total Length 118.2 3,518,904 

Proposed – Comparison portion for Alternatives 7A,B 35.1 1,044,274 

Alternative 7A 37.7 1,122,647 

Alternative 7B 46.2 1,375,654 

Proposed – Comparison portion for Alternative 7C 20.1 598,613 

Alternative 7C 20.3 603,205 Proposed – Comparison portion for Alternative 7D 6.2 185,028 Alternative 7D 6.8 201,938 Proposed – Comparison portion for Alternative 7E 3.8 113,844 Alternative 7E 4.5 133,341 Proposed – Comparison portion for Alternative 7F 10.5 313,696 Alternative 7F 10.8 320,921 Proposed – Comparison portion for Alternative 7G 3.3 98,279 

Alternative 7G 3.4 100,071 Proposed – Comparison portion for Alternative 7K 118.2 3,518,904 

Alternative 7K 148.1 4,410,863 

Proposed – Total Length 131.5 3,802,261 

Proposed – Comparison portion for Alternative 8A 51.9 1,500,956 

Alternative 8A 53.6 1,549,783 

Proposed – Comparison portion for Alternative 8B 45.3 1,308,468 

Alternative 8B 45.8 1,323,236 

Proposed – Comparison portion for Alternative 8C 6.5 188,907 Alternative 8C 6.4 185,417 Proposed – Comparison portion for Alternative 8D 6.9 199,704 Alternative 8D 8.1 233,511 Proposed – Comparison portion for Alternative 8E 7.0 201,048 Alternative 8E 18.3 528,993 

Proposed – Total Length 162.2 4,658,923 

Proposed – Comparison portion for Alternative 9A 7.8 223,564 Alternative 9A 7.7 220,833 Proposed – Comparison portion for Alternative 9B 49.1 1,410,246 

Alternative 9B 52.3 1,503,256 

Proposed – Comparison portion for Alternative 9C 14.4 412,378 

Alternative 9C 14.4 413,394 Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 1,641,467 

Alternative 9D 60.1 1,727,271 

Alternative 9F 63.3 1,818,759 

Alternative 9G 57.8 1,659,119 

Alternative 9H 61.0 1,750,607 

Proposed – Comparison portion for Alternative 9E (revised) 61.4 1,763,242 Alternative 9E (revised) 70.6 2,027,442 

10 Proposed – Total Length 34.4 1,021,405 

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 

Segment Number Proposed or Alternative Name

Segment Length 

(Miles)

Total Water 

Requirement

(acre-feet) 

7

10.813.5

3.44.23.20.60.61.9

10.8

0.60.60.41.01.00.31.80.30.60.7

26,768,979 gallons / 82 

1.35.00.34.34.61.35.46.2

8

11.7

4.64.84.04.11.60.6

14.3

0.70.75.3

9

TOTAL WATER REQUIRED: Proposed Segments

5.65.15.43.1

Table D.16-12 Page 2 of 2

Gateway West Transmission Line Final EIS
Table D.16-13. TMDL and 303(d) listed Streams in the Analysis Area

Segment Stream Name TMDL Sediment TMDL Temperature 303(d) listed Sediment 303(d) listed Temperature

Bear River X X

Bear River (Tributary 01) X

Bear River (Tributary 02) X

Bear River (Tributary 03) X

Bear River (Tributary 04) X

Bear River (Tributary 05) X

Marsh Creek X X

Montpelier Creek X

Sheep Creek X

Sheep Creek (Tributary 01) X

Sheep Creek (Tributary 02) X

Sheep Creek (Tributary 03) X

Sheep Creek (Tributary 04) X

Swan Lake Creek X

Segment 4 Proposed – Comparison Portion for Alternatives 4B, C, D, E, F Bear River X

Alternative 4B Bear River X

Alternative 4C Bear River X

Alternative 4D Bear River X

Alternative 4E Bear River X

Alternative 4F Bear River X

Bannock Creek X

Bannock Creek (Tributary 16) X

Bannock Creek (Tributary 17) X

Bannock Creek (Tributary 18) X

Bannock Creek (Tributary 19) X

Bannock Creek (Tributary 20) X

Bannock Creek (Tributary 21) X

Bannock Creek (Tributary 22) X

Bannock Creek (Tributary 23) X

Bannock Creek (Tributary 24) X

Bannock Creek (Tributary 25) X

Bannock Creek (Tributary 27) X

Deadwood Creek X

East Fork Rock Creek X

East Fork Rock Creek (Tributary 01) X

East Fork Rock Creek (Tributary 02) X

East Fork Rock Creek (Tributary 03) X

East Fork Rock Creek (Tributary 04) X

East Fork Rock Creek (Tributary 05) X

East Fork Rock Creek (Tributary 06) X

East Fork Rock Creek (Tributary 08) X

East Fork Rock Creek (Tributary 09) X

East Fork Rock Creek (Tributary 10) X

Hawkins Creek X

Hawkins Creek (Tributary 01) X

Hawkins Creek (Tributary 02) X

Hawkins Creek (Tributary 03) X

Hawkins Creek (Tributary 04) X

Hawkins Creek (Tributary 05) X

Hawkins Creek (Tributary 06) X

Marsh Creek X X

Pilot Spring Creek X

Rattlesnake Creek (Tributary 04) X

Rattlesnake Creek (Tributary 05) X

West Fork Bannock Creek (Tributary 01) X

Segment 4 Proposed – Total Length1/

Segment 5 Proposed – Total Length

Table D.16-13 Page 1 of 15

Gateway West Transmission Line Final EIS
Table D.16-13. TMDL and 303(d) listed Streams in the Analysis Area cont.

Segment Stream Name TMDL Sediment TMDL Temperature 303(d) listed Sediment 303(d) listed Temperature

West Fork Bannock Creek (Tributary 02) X

Yellow Dog Creek X

Yellow Dog Creek (Tributary 01) X

Bannock Creek X

Bannock Creek (Tributary 16) X

Bannock Creek (Tributary 17) X

Bannock Creek (Tributary 18) X

Bannock Creek (Tributary 19) X

Bannock Creek (Tributary 20) X

Bannock Creek (Tributary 21) X

Bannock Creek (Tributary 22) X

Bannock Creek (Tributary 23) X

Bannock Creek (Tributary 24) X

Bannock Creek (Tributary 25) X

Bannock Creek (Tributary 27) X

Deadwood Creek X

East Fork Rock Creek X

East Fork Rock Creek (Tributary 03) X

East Fork Rock Creek (Tributary 04) X

East Fork Rock Creek (Tributary 05) X

East Fork Rock Creek (Tributary 06) X

East Fork Rock Creek (Tributary 09) X

East Fork Rock Creek (Tributary 10) X

Hawkins Creek (Tributary 04) X

Hawkins Creek (Tributary 05) X

Hawkins Creek (Tributary 06) X

Rattlesnake Creek (Tributary 04) X

Rattlesnake Creek (Tributary 05) X

West Fork Bannock Creek (Tributary 01) X

West Fork Bannock Creek (Tributary 02) X

Yellow Dog Creek X

Yellow Dog Creek (Tributary 01) X

Bannock Creek X

Bannock Creek (Tributary 04) X

Bannock Creek (Tributary 05) X

Bannock Creek (Tributary 06) X

Bannock Creek (Tributary 07) X

Deadwood Creek (Tributary 01) X

East Fork Rock Creek X

East Fork Rock Creek (Tributary 04) X

East Fork Rock Creek (Tributary 05) X

East Fork Rock Creek (Tributary 10) X

Hawkins Creek (Tributary 04) X

Hawkins Creek (Tributary 05) X

Hawkins Creek (Tributary 06) X

South Fork Rock Creek (Tributary 07) X

South Fork Rock Creek (Tributary 09) X

South Fork Rock Creek (Tributary 10) X

South Fork Rock Creek (Tributary 11) X

South Fork Rock Creek (Tributary 32) X

South Fork Rock Creek (Tributary 33) X

South Fork Rock Creek (Tributary 34) X

South Fork Rock Creek (Tributary 35) X

South Fork Rock Creek (Tributary 37) X

South Fork Rock Creek (Tributary 45) X

Segment 5 Proposed – Total Length (cont)

Segment 5 Proposed – Comparison Portion for Alternatives 5A, B

Alternative 5A

Table D.16-13 Page 2 of 15

Gateway West Transmission Line Final EIS
Table D.16-13. TMDL and 303(d) listed Streams in the Analysis Area cont.

Segment Stream Name TMDL Sediment TMDL Temperature 303(d) listed Sediment 303(d) listed Temperature

Bannock Creek X

Bannock Creek (Tributary 09) X

Bannock Creek (Tributary 10) X

Bannock Creek (Tributary 11) X

Deadwood Creek (Tributary 01) X

East Fork Rock Creek X

East Fork Rock Creek (Tributary 04) X

East Fork Rock Creek (Tributary 05) X

East Fork Rock Creek (Tributary 10) X

Hawkins Creek (Tributary 04) X

Hawkins Creek (Tributary 05) X

Hawkins Creek (Tributary 06) X

South Fork Rock Creek (Tributary 06) X

South Fork Rock Creek (Tributary 07) X

South Fork Rock Creek (Tributary 09) X

South Fork Rock Creek (Tributary 10) X

South Fork Rock Creek (Tributary 11) X

South Fork Rock Creek (Tributary 12) X

South Fork Rock Creek (Tributary 20) X

South Fork Rock Creek (Tributary 22) X

South Fork Rock Creek (Tributary 25) X

South Fork Rock Creek (Tributary 27) X

South Fork Rock Creek (Tributary 28) X

South Fork Rock Creek (Tributary 32) X

South Fork Rock Creek (Tributary 33) X

South Fork Rock Creek (Tributary 34) X

South Fork Rock Creek (Tributary 36) X

South Fork Rock Creek (Tributary 37) X

South Fork Rock Creek (Tributary 40) X

South Fork Rock Creek (Tributary 41) X

South Fork Rock Creek (Tributary 43) X

South Fork Rock Creek (Tributary 44) X

South Fork Rock Creek (Tributary 45) X

Bannock Creek X

Bannock Creek (Tributary 16) X

Bannock Creek (Tributary 17) X

Bannock Creek (Tributary 18) X

Bannock Creek (Tributary 19) X

Bannock Creek (Tributary 20) X

Bannock Creek (Tributary 21) X

Bannock Creek (Tributary 22) X

Bannock Creek (Tributary 23) X

Bannock Creek (Tributary 24) X

Bannock Creek (Tributary 25) X

Bannock Creek (Tributary 27) X

East Fork Rock Creek X

East Fork Rock Creek (Tributary 01) X

East Fork Rock Creek (Tributary 02) X

East Fork Rock Creek (Tributary 03) X

East Fork Rock Creek (Tributary 04) X

East Fork Rock Creek (Tributary 05) X

East Fork Rock Creek (Tributary 06) X

East Fork Rock Creek (Tributary 08) X

East Fork Rock Creek (Tributary 09) X

East Fork Rock Creek (Tributary 10) X

Rattlesnake Creek (Tributary 04) X

Alternative 5B

Segment 5 Proposed – Comparison Portion for Alternative 5C

Table D.16-13 Page 3 of 15

Gateway West Transmission Line Final EIS
Table D.16-13. TMDL and 303(d) listed Streams in the Analysis Area cont.

Segment Stream Name TMDL Sediment TMDL Temperature 303(d) listed Sediment 303(d) listed Temperature

Rattlesnake Creek (Tributary 05) X

West Fork Bannock Creek (Tributary 01) X

West Fork Bannock Creek (Tributary 02) X

Yellow Dog Creek X

Bannock Creek X

Bannock Creek (Tributary 01) X

Bannock Creek (Tributary 02) X

Bannock Creek (Tributary 03) X

Bannock Creek (Tributary 12) X

Bannock Creek (Tributary 13) X

Bannock Creek (Tributary 14) X

Bannock Creek (Tributary 15) X

Bannock Creek (Tributary 26) X

Moonshine Creek X

Moonshine Creek (Tributary 01) X

Moonshine Creek (Tributary 02) X

Moonshine Creek (Tributary 03) X

Rattlesnake Creek X

Rattlesnake Creek (Tributary 01) X

Rattlesnake Creek (Tributary 02) X

Rattlesnake Creek (Tributary 03) X

Rattlesnake Creek (Tributary 04) X

Rattlesnake Creek (Tributary 05) X

East Fork Rock Creek X

East Fork Rock Creek (Tributary 01) X

East Fork Rock Creek (Tributary 02) X

East Fork Rock Creek (Tributary 04) X

East Fork Rock Creek (Tributary 05) X

East Fork Rock Creek (Tributary 08) X

East Fork Rock Creek (Tributary 10) X

East Fork Rock Creek X

East Fork Rock Creek (Tributary 01) X

East Fork Rock Creek (Tributary 02) X

East Fork Rock Creek (Tributary 04) X

East Fork Rock Creek (Tributary 05) X

East Fork Rock Creek (Tributary 08) X

East Fork Rock Creek (Tributary 10) X

Bannock Creek X

Bannock Creek (Tributary 18) X

Bannock Creek (Tributary 19) X

Bannock Creek (Tributary 20) X

Bannock Creek (Tributary 21) X

Bannock Creek (Tributary 22) X

Bannock Creek (Tributary 23) X

Bannock Creek (Tributary 24) X

Bannock Creek (Tributary 25) X

Bannock Creek (Tributary 27) X

Bannock Creek (Tributary 30) X

Deadwood Creek X

Dry Creek X X

Dry Creek (Tributary 01) X

Dry Creek (Tributary 02) X

East Fork Rock Creek X

East Fork Rock Creek (Tributary 03) X

East Fork Rock Creek (Tributary 04) X

Alternative 5C

Segment 5 Proposed – Comparison Portion for Alternative 5D

Alternative 5D

Segment 7 Proposed – Total Length

Segment 5 Proposed – Comparison Portion for Alternative 5C (cont)

Table D.16-13 Page 4 of 15

Gateway West Transmission Line Final EIS
Table D.16-13. TMDL and 303(d) listed Streams in the Analysis Area cont.

Segment Stream Name TMDL Sediment TMDL Temperature 303(d) listed Sediment 303(d) listed Temperature

East Fork Rock Creek (Tributary 05) X

East Fork Rock Creek (Tributary 07) X

East Fork Rock Creek (Tributary 08) X

East Fork Rock Creek (Tributary 09) X

East Fork Rock Creek (Tributary 10) X

Hawkins Creek X

Hawkins Creek (Tributary 01) X

Hawkins Creek (Tributary 02) X

Hawkins Creek (Tributary 03) X

Hawkins Creek (Tributary 04) X

Hawkins Creek (Tributary 05) X

Hawkins Creek (Tributary 06) X

Marsh Creek X X

Raft River X

Rock Creek (Tributary 02) X

Sheep Creek X

South Fork Hawkins Creek X

South Fork Rock Creek X

South Fork Rock Creek (Tributary 01) X

South Fork Rock Creek (Tributary 08) X

South Fork Rock Creek (Tributary 09) X

West Fork Bannock Creek (Tributary 01) X

West Fork Bannock Creek (Tributary 02) X

Yellow Dog Creek X

Yellow Dog Creek (Tributary 01) X

Bannock Creek X

Bannock Creek (Tributary 18) X

Bannock Creek (Tributary 19) X

Bannock Creek (Tributary 20) X

Bannock Creek (Tributary 21) X

Bannock Creek (Tributary 22) X

Bannock Creek (Tributary 23) X

Bannock Creek (Tributary 24) X

Bannock Creek (Tributary 25) X

Bannock Creek (Tributary 27) X

Bannock Creek (Tributary 30) X

Deadwood Creek X

East Fork Rock Creek X

East Fork Rock Creek (Tributary 03) X

East Fork Rock Creek (Tributary 04) X

East Fork Rock Creek (Tributary 05) X

East Fork Rock Creek (Tributary 07) X

East Fork Rock Creek (Tributary 08) X

East Fork Rock Creek (Tributary 09) X

East Fork Rock Creek (Tributary 10) X

Hawkins Creek X

Hawkins Creek (Tributary 04) X

Hawkins Creek (Tributary 05) X

Hawkins Creek (Tributary 06) X

Sheep Creek X

South Fork Rock Creek X

South Fork Rock Creek (Tributary 01) X

South Fork Rock Creek (Tributary 08) X

South Fork Rock Creek (Tributary 09) X

West Fork Bannock Creek (Tributary 01) X

Segment 7 Proposed – Comparison Portion for Alternatives 7A, B

Segment 7 Proposed – Total Length (cont)

Table D.16-13 Page 5 of 15

Gateway West Transmission Line Final EIS
Table D.16-13. TMDL and 303(d) listed Streams in the Analysis Area cont.

Segment Stream Name TMDL Sediment TMDL Temperature 303(d) listed Sediment 303(d) listed Temperature

West Fork Bannock Creek (Tributary 02) X

Yellow Dog Creek X

Yellow Dog Creek (Tributary 01) X

Bannock Creek X

Bannock Creek (Tributary 04) X

Bannock Creek (Tributary 05) X

Bannock Creek (Tributary 06) X

Bannock Creek (Tributary 07) X

Bannock Creek (Tributary 08) X

Deadwood Creek (Tributary 01) X

Hawkins Creek X

Hawkins Creek (Tributary 06) X

Sheep Creek X

South Fork Rock Creek X

South Fork Rock Creek (Tributary 04) X

South Fork Rock Creek (Tributary 13) X

South Fork Rock Creek (Tributary 14) X

South Fork Rock Creek (Tributary 15) X

South Fork Rock Creek (Tributary 16) X

South Fork Rock Creek (Tributary 17) X

South Fork Rock Creek (Tributary 18) X

South Fork Rock Creek (Tributary 19) X

South Fork Rock Creek (Tributary 20) X

South Fork Rock Creek (Tributary 22) X

South Fork Rock Creek (Tributary 34) X

South Fork Rock Creek (Tributary 35) X

South Fork Rock Creek (Tributary 38) X

South Fork Rock Creek (Tributary 39) X

South Fork Rock Creek (Tributary 40) X

South Fork Rock Creek (Tributary 41) X

South Fork Rock Creek (Tributary 42) X

South Fork Rock Creek (Tributary 43) X

South Fork Rock Creek (Tributary 44) X

South Fork Rock Creek (Tributary 45) X

Warm Springs Creek X

Warm Springs Creek (Tributary 01) X

Warm Springs Creek (Tributary 02) X

Warm Springs Creek (Tributary 03) X

Bannock Creek X

Bannock Creek (Tributary 09) X

Bannock Creek (Tributary 10) X

Bannock Creek (Tributary 11) X

Deadwood Creek (Tributary 01) X

Hawkins Creek X

Hawkins Creek (Tributary 06) X

Sheep Creek X

South Fork Rock Creek X

South Fork Rock Creek (Tributary 02) X

South Fork Rock Creek (Tributary 04) X

South Fork Rock Creek (Tributary 05) X

South Fork Rock Creek (Tributary 06) X

South Fork Rock Creek (Tributary 17) X

South Fork Rock Creek (Tributary 21) X

South Fork Rock Creek (Tributary 23) X

South Fork Rock Creek (Tributary 24) X

South Fork Rock Creek (Tributary 25) X

Alternative 7A

Alternative 7B

Segment 7 Proposed – Comparison Portion for Alternatives 7A, B (cont)

Table D.16-13 Page 6 of 15

Gateway West Transmission Line Final EIS
Table D.16-13. TMDL and 303(d) listed Streams in the Analysis Area cont.

Segment Stream Name TMDL Sediment TMDL Temperature 303(d) listed Sediment 303(d) listed Temperature

South Fork Rock Creek (Tributary 26) X

South Fork Rock Creek (Tributary 27) X

South Fork Rock Creek (Tributary 28) X

South Fork Rock Creek (Tributary 36) X

Warm Springs Creek X

Warm Springs Creek (Tributary 01) X

Warm Springs Creek (Tributary 02) X

Warm Springs Creek (Tributary 03) X

Segment 7 Proposed – Comparison Portion for Alternative 7C Raft River X

Alternative 7C Raft River X

Segment 7 Proposed – Comparison Portion for Alternative 7G Dry Creek X X

Alternative 7G Dry Creek X X

Bannock Creek X

Bannock Creek (Tributary 18) X

Bannock Creek (Tributary 19) X

Bannock Creek (Tributary 20) X

Bannock Creek (Tributary 21) X

Bannock Creek (Tributary 22) X

Bannock Creek (Tributary 23) X

Bannock Creek (Tributary 24) X

Bannock Creek (Tributary 25) X

Bannock Creek (Tributary 27) X

Bannock Creek (Tributary 30) X

Deadwood Creek X

Dry Creek X X

Dry Creek (Tributary 01) X

Dry Creek (Tributary 02) X

East Fork Rock Creek X

East Fork Rock Creek (Tributary 03) X

East Fork Rock Creek (Tributary 04) X

East Fork Rock Creek (Tributary 05) X

East Fork Rock Creek (Tributary 07) X

East Fork Rock Creek (Tributary 08) X

East Fork Rock Creek (Tributary 09) X

East Fork Rock Creek (Tributary 10) X

Hawkins Creek X

Hawkins Creek (Tributary 01) X

Hawkins Creek (Tributary 02) X

Hawkins Creek (Tributary 03) X

Hawkins Creek (Tributary 04) X

Hawkins Creek (Tributary 05) X

Hawkins Creek (Tributary 06) X

Marsh Creek X X

Raft River X

Rock Creek (Tributary 02) X

Sheep Creek X

South Fork Hawkins Creek X

South Fork Rock Creek X

South Fork Rock Creek (Tributary 01) X

South Fork Rock Creek (Tributary 08) X

South Fork Rock Creek (Tributary 09) X

West Fork Bannock Creek (Tributary 01) X

West Fork Bannock Creek (Tributary 02) X

Yellow Dog Creek X

Yellow Dog Creek (Tributary 01) X

Segment 7 Proposed – Comparison Portion for Alternative 7K

Alternative 7B (cont)

Table D.16-13 Page 7 of 15

Gateway West Transmission Line Final EIS
Table D.16-13. TMDL and 303(d) listed Streams in the Analysis Area cont.

Segment Stream Name TMDL Sediment TMDL Temperature 303(d) listed Sediment 303(d) listed Temperature

Bannock Creek X

Bannock Creek (Tributary 09) X

Bannock Creek (Tributary 10) X

Bannock Creek (Tributary 11) X

Cold Creek X

Cold Creek (Tributary 01) X

Deadwood Creek (Tributary 01) X

Dry Creek X X

Goose Creek X X

Goose Creek (Tributary 01) X

Hawkins Creek X

Hawkins Creek (Tributary 01) X

Hawkins Creek (Tributary 02) X

Hawkins Creek (Tributary 03) X

Hawkins Creek (Tributary 06) X

Marsh Creek X X

Raft River X X

Sheep Creek X

South Fork Hawkins Creek X

South Fork Rock Creek X

South Fork Rock Creek (Tributary 03) X

South Fork Rock Creek (Tributary 04) X

South Fork Rock Creek (Tributary 29) X

South Fork Rock Creek (Tributary 30) X

South Fork Rock Creek (Tributary 31) X

Trapper Creek X

Trapper Creek (Tributary 01) X

Clover Creek X X

Clover Creek (Tributary 01) X

Clover Creek (Tributary 02) X

Cold Springs Creek X

Indian Creek (Tributary 12) X

Indian Creek (Tributary 16) X

Indian Creek (Tributary 17) X

Indian Creek (Tributary 19) X

Indian Creek (Tributary 21) X

Indian Creek (Tributary 22) X

Indian Creek (Tributary 25) X X

Indian Creek (Tributary 26) X X

Indian Creek (Tributary14) X

Little Canyon Creek X

Little Canyon Creek (Tributary 01) X

Malad River X

North Indian Creek (Tributary 04) X

North Indian Creek (Tributary 05) X

Pioneer Reservoir X X

Sand Creek X X

Sand Creek (Tributary 01) X

Sand Creek (Tributary 02) X

Sand Creek (Tributary 03) X

Sand Creek (Tributary 04) X

Sand Creek (Tributary 05) X

Sand Creek (Tributary 06) X

Sand Creek (Tributary 08) X

Sand Creek (Tributary 09) X

Alternative 7K

Segment 8 Proposed – Total Length

Table D.16-13 Page 8 of 15

Gateway West Transmission Line Final EIS
Table D.16-13. TMDL and 303(d) listed Streams in the Analysis Area cont.

Segment Stream Name TMDL Sediment TMDL Temperature 303(d) listed Sediment 303(d) listed Temperature

Sand Creek (Tributary 10) X

Sand Creek (Tributary 11) X

Sand Creek (Tributary 12) X

Sand Creek (Tributary 13) X X

Snake River X

South Gooding Main Canal X

Clover Creek X X

Clover Creek (Tributary 01) X

Clover Creek (Tributary 02) X

Little Canyon Creek X

Little Canyon Creek (Tributary 01) X

Malad River X

Pioneer Reservoir X X

South Gooding Main Canal X

Billingsley Creek X

Little Canyon Creek X

Little Canyon Creek (Tributary 01) X

Little Canyon Creek (Tributary 02) X

Little Canyon Creek (Tributary 03) X

Snake River X

Snake River (Tributary 04) X

Indian Creek (Tributary 12) X

Indian Creek (Tributary 16) X

Indian Creek (Tributary 17) X

Indian Creek (Tributary 19) X

Indian Creek (Tributary 21) X

Indian Creek (Tributary 22) X

Indian Creek (Tributary 25) X X

Indian Creek (Tributary 26) X X

Indian Creek (Tributary14) X

North Indian Creek (Tributary 04) X

North Indian Creek (Tributary 05) X

Sand Creek X X

Sand Creek (Tributary 01) X

Sand Creek (Tributary 02) X

Sand Creek (Tributary 03) X

Sand Creek (Tributary 04) X

Sand Creek (Tributary 05) X

Sand Creek (Tributary 06) X

Sand Creek (Tributary 08) X

Sand Creek (Tributary 09) X

Sand Creek (Tributary 10) X

Sand Creek (Tributary 11) X

Sand Creek (Tributary 12) X

Sand Creek (Tributary 13) X X

Snake River X

Indian Creek X X

Indian Creek (Tributary 01) X

Indian Creek (Tributary 02) X

Indian Creek (Tributary 03) X

Indian Creek (Tributary 04) X

Indian Creek (Tributary 05) X

Indian Creek (Tributary 06) X

Indian Creek (Tributary 07) X

Indian Creek (Tributary 08) X

Segment 8 Proposed – Comparison Portion for Alternative 8A

Alternative 8A

Segment 8 Proposed – Comparison Portion for Alternative 8B

Alternative 8B

Segment 8 Proposed – Total Length (cont)

Table D.16-13 Page 9 of 15

Gateway West Transmission Line Final EIS
Table D.16-13. TMDL and 303(d) listed Streams in the Analysis Area cont.

Segment Stream Name TMDL Sediment TMDL Temperature 303(d) listed Sediment 303(d) listed Temperature

Indian Creek (Tributary 09) X

Indian Creek (Tributary 10) X

Indian Creek (Tributary 15) X

Indian Creek (Tributary 17) X

Indian Creek (Tributary 19) X

Indian Creek (Tributary 21) X

Indian Creek (Tributary 22) X

Indian Creek (Tributary 23) X

Indian Creek (Tributary 24) X X

Indian Creek (Tributary 26) X X

Indian Creek (Tributary13) X

North Indian Creek X X

North Indian Creek (Tributary 01) X

North Indian Creek (Tributary 02) X

North Indian Creek (Tributary 06) X

North Indian Creek (Tributary 07) X

North Indian Creek (Tributary 08) X

Sand Creek X

Sand Creek (Tributary 04) X

Sand Creek (Tributary 07) X

Sand Creek (Tributary 11) X

Snake River X

Indian Creek (Tributary 15) X

Indian Creek (Tributary 17) X

Indian Creek (Tributary 19) X

Indian Creek (Tributary 21) X

Indian Creek (Tributary 22) X

Indian Creek (Tributary 15) X

Indian Creek (Tributary 17) X

Indian Creek (Tributary 18) X

Indian Creek (Tributary 19) X

Indian Creek (Tributary 20) X

Indian Creek (Tributary 21) X

Indian Creek (Tributary 22) X

Indian Creek (Tributary 12) X

Indian Creek (Tributary14) X

North Indian Creek (Tributary 04) X

North Indian Creek (Tributary 05) X

Sand Creek X X

Sand Creek (Tributary 06) X

Sand Creek (Tributary 08) X

Sand Creek (Tributary 10) X

Sand Creek (Tributary 13) X X

Indian Creek (Tributary 11) X

Indian Creek (Tributary14) X

North Indian Creek (Tributary 03) X

North Indian Creek (Tributary 04) X

Sand Creek X X

Sand Creek (Tributary 08) X

Sand Creek (Tributary 09) X

Sand Creek (Tributary 10) X

Sand Creek (Tributary 13) X X

Sand Creek (Tributary 14) X X

Sand Creek (Tributary 15) X X

Segment 8 Proposed – Comparison Portion for Alternative 8E Snake River X

Alternative 8C

Segment 8 Proposed – Comparison Portion for Alternative 8D

Alternative 8D

Alternative 8B (cont)

Alternative 8B – Comparison Portion for Alternative 8C

Table D.16-13 Page 10 of 15

Gateway West Transmission Line Final EIS
Table D.16-13. TMDL and 303(d) listed Streams in the Analysis Area cont.

Segment Stream Name TMDL Sediment TMDL Temperature 303(d) listed Sediment 303(d) listed Temperature

Birch Creek X

Browns Creek X

Bruneau River X

Bruneau River (Tributary 01) X

Castle Creek X X

Castle Creek (Tributary 06) X

Catherine Creek X

Cottonwood Creek X

Cottonwood Creek (Tributary 01) X

Deadman Creek X

Deadman Creek (Tributary 01) X

Deadman Creek (Tributary 02) X

Deadman Creek (Tributary 03) X

Deadman Creek (Tributary 04) X

Deadman Creek (Tributary 05) X

Deadman Creek (Tributary 07) X

Deadman Creek (Tributary 09) X

Deadman Creek (Tributary 10) X

Deadman Creek (Tributary 11) X

Deadman Creek (Tributary 12) X

Deadman Creek (Tributary 13) X

Deadman Creek (Tributary 14) X

Deadman Creek (Tributary 15) X

Deadman Creek (Tributary 16) X

Deadman Creek (Tributary 17) X

Deadman Creek (Tributary 18) X

Deadman Creek (Tributary 19) X

Devil Creek X

Jacks Creek X X

McMullen Creek X X

McMullen Creek (Tributary 01) X

McMullen Creek (Tributary 02) X

McMullen Creek (Tributary 03) X

McMullen Creek (Tributary 04) X

McMullen Creek (Tributary 05) X

McMullen Creek (Tributary 06) X

McMullen Creek (Tributary 07) X

McMullen Creek (Tributary 08) X

McMullen Creek (Tributary 09) X

McMullen Creek (Tributary 10) X

McMullen Creek (Tributary 11) X

Pickett Creek X

Rock Creek X

Rock Creek (Tributary 07) X

Sailor Creek X

Sailor Creek (Tributary 01) X

Sailor Creek (Tributary 02) X

Sailor Creek (Tributary 03) X

Salmon Falls Creek X

Sinker Creek X X

South Side Canal X

Sugar Valley Wash X

Cottonwood Creek X

Cottonwood Creek (Tributary 01) X

McMullen Creek (Tributary 07) X

Rock Creek (Tributary 07) X

Segment 9 Proposed – Total Length

Segment 9 Proposed – Comparison Portion for Alternative 9A

Table D.16-13 Page 11 of 15

Gateway West Transmission Line Final EIS
Table D.16-13. TMDL and 303(d) listed Streams in the Analysis Area cont.

Segment Stream Name TMDL Sediment TMDL Temperature 303(d) listed Sediment 303(d) listed Temperature

Cottonwood Creek X

Cottonwood Creek (Tributary 01) X

McMullen Creek (Tributary 07) X

Deadman Creek X

Deadman Creek (Tributary 01) X

Deadman Creek (Tributary 02) X

Deadman Creek (Tributary 03) X

Deadman Creek (Tributary 04) X

Deadman Creek (Tributary 05) X

Deadman Creek (Tributary 07) X

Deadman Creek (Tributary 09) X

Deadman Creek (Tributary 10) X

Deadman Creek (Tributary 11) X

Deadman Creek (Tributary 12) X

Deadman Creek (Tributary 13) X

Deadman Creek (Tributary 14) X

Deadman Creek (Tributary 15) X

Deadman Creek (Tributary 16) X

Deadman Creek (Tributary 17) X

Deadman Creek (Tributary 18) X

Deadman Creek (Tributary 19) X

Devil Creek X

Sailor Creek X

Sailor Creek (Tributary 01) X

Sailor Creek (Tributary 02) X

Salmon Falls Creek X

Deadman Creek X

Deadman Creek (Tributary 05) X

Deadman Creek (Tributary 06) X

Deadman Creek (Tributary 07) X

Deadman Creek (Tributary 08) X

Deadman Creek (Tributary 19) X

Devil Creek X

Sailor Creek X

Sailor Creek (Tributary 01) X

Sailor Creek (Tributary 02) X

Salmon Falls Creek X

Yahoo Creek X X

Yahoo Creek (Tributary 01) X

Yahoo Creek (Tributary 02) X

Yahoo Creek (Tributary 03) X

Yahoo Creek (Tributary 04) X

Yahoo Creek (Tributary 05) X

Yahoo Creek (Tributary 06) X

Yahoo Creek (Tributary 07) X

Devil Creek X

Salmon Falls Creek X

Devil Creek X

Salmon Falls Creek X

Birch Creek X

Browns Creek X

Bruneau River X

Bruneau River (Tributary 01) X

Castle Creek X X

Castle Creek (Tributary 06) X

Segment 9 Proposed – Comparison Portion for Alternative 9B

Alternative 9B

Segment 9 Proposed – Comparison Portion for Alternative 9C

Alternative 9C

Segment 9 Proposed – Comparison Portion for Alternatives 9D, F, G, H

Alternative 9A

Table D.16-13 Page 12 of 15

Gateway West Transmission Line Final EIS
Table D.16-13. TMDL and 303(d) listed Streams in the Analysis Area cont.

Segment Stream Name TMDL Sediment TMDL Temperature 303(d) listed Sediment 303(d) listed Temperature

Catherine Creek X

Jacks Creek X X

Pickett Creek X

Sinker Creek X X

South Side Canal X

Sugar Valley Wash X

Corder Creek (Tributary 01) X

Corder Creek (Tributary 02) X

Corder Creek (Tributary 03) X

Corder Creek (Tributary 04) X

Corder Creek (Tributary 05) X

Jack Creek X

Jack Creek (Tributary 01) X

Jack Creek (Tributary 02) X

Rabbit Creek X

Rabbit Creek (Tributary 01) X

Snake River X

Bruneau River X

Bruneau River (Tributary 01) X

Corder Creek (Tributary 01) X

Corder Creek (Tributary 02) X

Corder Creek (Tributary 03) X

Corder Creek (Tributary 04) X

Corder Creek (Tributary 05) X

Jack Creek X

Jack Creek (Tributary 01) X

Jack Creek (Tributary 02) X

Jacks Creek X X

Rabbit Creek X

Rabbit Creek (Tributary 01) X

Snake River X

South Side Canal X

Sugar Valley Wash X

Corder Creek (Tributary 01) X

Corder Creek (Tributary 02) X

Corder Creek (Tributary 03) X

Corder Creek (Tributary 04) X

Corder Creek (Tributary 05) X

Jack Creek X

Jack Creek (Tributary 01) X

Jack Creek (Tributary 02) X

Rabbit Creek X

Rabbit Creek (Tributary 01) X

Sinker Creek X X

Snake River X

Bruneau River X

Bruneau River (Tributary 01) X

Corder Creek (Tributary 01) X

Corder Creek (Tributary 02) X

Corder Creek (Tributary 03) X

Corder Creek (Tributary 04) X

Corder Creek (Tributary 05) X

Jack Creek X

Jack Creek (Tributary 01) X

Jack Creek (Tributary 02) X

Alternative 9D

Alternative 9F

Alternative 9G

Alternative 9H

Segment 9 Proposed – Comparison Portion for Alternatives 9D, F, G, H (cont)

Table D.16-13 Page 13 of 15

Gateway West Transmission Line Final EIS
Table D.16-13. TMDL and 303(d) listed Streams in the Analysis Area cont.

Segment Stream Name TMDL Sediment TMDL Temperature 303(d) listed Sediment 303(d) listed Temperature

Jacks Creek X X

Rabbit Creek X

Rabbit Creek (Tributary 01) X

Sinker Creek X X

Snake River X

South Side Canal X

Sugar Valley Wash X

Birch Creek X

Browns Creek X

Bruneau River X

Bruneau River (Tributary 01) X

Castle Creek X X

Castle Creek (Tributary 06) X

Catherine Creek X

Jacks Creek X X

Pickett Creek X

Sinker Creek X X

South Side Canal X

Sugar Valley Wash X

Birch Creek X

Birch Creek (Tributary 01) X

Birch Creek (Tributary 02) X

Browns Creek X

Browns Creek (Tributary 01) X

Browns Creek (Tributary 02) X

Browns Creek (Tributary 03) X

Browns Creek (Tributary 04) X

Browns Creek (Tributary 05) X

Browns Creek (Tributary 06) X

Browns Creek (Tributary 07) X

Browns Creek (Tributary 08) X

Browns Creek (Tributary 09) X

Browns Creek (Tributary 10) X

Bruneau River X

Castle Creek X

Castle Creek (Tributary 01) X X

Castle Creek (Tributary 02) X

Castle Creek (Tributary 03) X

Castle Creek (Tributary 04) X

Castle Creek (Tributary 05) X

Castle Creek (Tributary 07) X

Castle Creek (Tributary 08) X

Castle Creek (Tributary 09) X

Castle Creek (Tributary 10) X

Castle Creek (Tributary 12) X

Castle Creek (Tributary 13) X

Castle Creek (Tributary 14) X

Castle Creek (Tributary 15) X

Castle Creek (Tributary 16) X

Castle Creek (Tributary 17) X

Pickett Creek X

Pickett Creek (Tributary 01) X X

Poison Creek X

Sinker Creek X X

Alternative 9E (revised)

Alternative 9H (cont)

Segment 9 Proposed – Comparison Portion for Alternative 9E (revised)

Table D.16-13 Page 14 of 15

Gateway West Transmission Line Final EIS
Table D.16-13. TMDL and 303(d) listed Streams in the Analysis Area cont.

Segment Stream Name TMDL Sediment TMDL Temperature 303(d) listed Sediment 303(d) listed Temperature

Rock Creek (Tributary 01) X

Rock Creek (Tributary 02) X

Rock Creek (Tributary 03) X

Rock Creek (Tributary 04) X

Rock Creek (Tributary 05) X

Rock Creek (Tributary 06) X

Snake River X X

Snake River (Tributary 01) X

Snake River (Tributary 02) X

Snake River (Tributary 03) X

Notes: and Proposed 10

Segment 10 Proposed – Total Length

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), Proposed 8 (including 8B), Proposed 9 (including 9E), 

1/ Alternative 4G was added in late 2012 and was therefore not added to this table

Table D.16-13 Page 15 of 15

Gateway West Transmission Line Final EIS
Table D.16-14. Acreage Comparison of Construction Related Stream Impacts

Within 500 feet of Perennial and 

Intermittent Streams

Within 100 feet of 

Ephemeral Streams

Wit

Disturbed Acres

% of Total 

Disturbance Area Disturbed Acres

% of Total 

Disturbance Area D

1W(a) Proposed – Total Length 73.8 153 19.7 49 6.3 Proposed – Comparison portion for Alternative 1W(a)-B 16.5 43 29.4 3 1.8 Alternative 1W(a)-B 20.9 30 11.0 4 1.5 1W(c) Proposed – Total Length 73.6 193 20.2 63 6.6 Proposed – Total Length 91.9 58 3.3 99 5.6 

Proposed – Comparison portion for Alternative 2A 16.8 18 5.8 17 5.4 Alternative 2A 16.0 7 2.1 30 8.6 

Proposed – Comparison portion for Alternative 2B 12.5 18 7.5 13 5.4 

Alternative 2B 12.2 13 6.2 17 8.3 

Segment 3 Proposed – Total Length 45.9 87 10.4 42 5.0 

Segment 3A Proposed – Total Length 5.1 10 16.3 5 8.6 Proposed – Total Length 197.6 563 14.5 168 4.3 Proposed – Comparison portion for Alternatives 4B-4F 85.2 341 19.9 74 4.3 Alternative 4B 100.2 255 12.3 151 7.3 Alternative 4C 101.6 238 11.5 144 6.9 Alternative 4D 100.8 260 12.3 167 7.9 Alternative 4E 102.2 238 11.4 152 7.3 Alternative 4F 87.5 333 19.3 78 4.5 Proposed – Total Length 55.7 <1 127 10.8 

Proposed – Comparison portion for Alternatives 5A,B 22.3 45 9.8 Alternative 5A 29.7 89 13.8 46 7.1 

Alternative 5B 40.4 97 11.5 62 7.4 

Proposed – Comparison portion for Alternatives 5C 32.9 <1 95 13.0 

Alternative 5C 26.0 9 1.8 36 7.1 

Proposed – Comparison portion for Alternatives 5D 19.2 <1 58 11.9 

Alternative 5D 17.0 14 3.3 36 8.7 

Proposed – Comparison portion for Alternatives 5E 5.8 8 4.3 

Alternative 5E 5.3 7 4.5 

6 Proposed – Total Length 0.5 

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, aNotes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero acres or null value

Notes: Acreages for TMDL and 303(d) listed streams overlap with perennial, intermittent, and ephemeral disturbance acres and are not included in the total disturbed acres column

Segment Length 

(Miles)

1W

2

41/

Proposed or Alternative Name

Segment 

Number

5

1/ Alternative 4G was added in late 2012 and was therefore not added to this table

3

Table D.16-14 Page 1 of 2

Gateway West Transmission Line Final EIS
Table D.16-14. Acreage Comparison of Construction Related Stream Impacts cont.

Within 500 feet of Perennial and 

Intermittent Streams

Within 100 feet of 

Ephemeral Streams

Wit

Disturbed Acres

% of Total 

Disturbance Area Disturbed Acres

% of Total 

Disturbance Area D

Proposed – Total Length 118.2 119 5.3 130 5.8 Proposed – Comparison portion for Alternatives 7A,B 35.1 72 11.1 

Alternative 7A 37.7 101 13.0 71 9.2 Alternative 7B 46.2 101 11.0 76 8.3 Proposed – Comparison portion for Alternative 7C 20.1 14 3.8 6 1.6 

Alternative 7C 20.3 12 3.4 19 5.1 

Proposed – Comparison portion for Alternative 7D 6.2 6 4.6 6 4.8 

Alternative 7D 6.8 13 8.6 6 3.9 Proposed – Comparison portion for Alternative 7E 3.8 25 35.3 Alternative 7E 4.5 29 30.1 Proposed – Comparison portion for Alternative 7F 10.5 83 37.1 3 1.2 

Alternative 7F 10.8 64 29.8 12 5.4 

Proposed – Comparison portion for Alternative 7G 3.3 7 10.4 Alternative 7G 3.4 5 6.2 

Proposed – Comparison portion for Alternative 7K 118.2 118 5.2 129 5.7 Alternative 7K 148.1 369 12.9 226 7.9 Proposed – Total Length 131.5 98 3.9 108 4.3 

Proposed – Comparison portion for Alternative 8A 51.9 26 2.7 15 1.6 

Alternative 8A 53.6 26 2.7 11 1.1 

Proposed – Comparison portion for Alternative 8B 45.3 27 3.0 49 5.4 

Alternative 8B 45.8 16 1.8 49 5.3 

Proposed – Comparison portion for Alternative 8C 6.5 16 10.0 15 9.3 Alternative 8C 6.4 9 6.4 9 6.2 

Proposed – Comparison portion for Alternative 8D 6.9 2 1.3 

Alternative 8D 8.1 5 2.6 

Proposed – Comparison portion for Alternative 8E 7.0 2 1.9 3 2.1 

Alternative 8E 18.3 7 2.0 14 4.2 

Proposed – Total Length 162.2 171 5.2 111 3.4 Proposed – Comparison portion for Alternative 9A 7.8 3 2.0 2 1.5 

Alternative 9A 7.7 7 4.4 <1 

Proposed – Comparison portion for Alternative 9B 49.1 73 7.1 20 1.9 

Alternative 9B 52.3 22 2.3 29 3.0 

Proposed – Comparison portion for Alternative 9C 14.4 5 1.5 10 3.2 

Alternative 9C 14.4 2 0.6 7 2.2 

Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 35 3.0 54 4.7 

Alternative 9D 60.1 30 2.8 

Alternative 9F 63.3 46 3.9 

Alternative 9G 57.8 25 2.4 

Alternative 9H 61.0 41 3.6 

Proposed – Comparison portion for Alternative 9E (revised) 61.4 35 2.8 60 4.9 

Alternative 9E (revised) 70.6 20 1.6 91 7.1 

10 Proposed – Total Length 34.4 30 4.4 9 1.4 

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, aNotes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero acres or null valueNotes: Acreages for TMDL and 303(d) listed streams overlap with perennial, intermittent, and ephemeral disturbance acres and are not included in the total disturbed acres column

9

Proposed or Alternative Name

Segment Length 

(Miles)

Segment 

Number

78

Table D.16-14 Page 2 of 2

Gateway West Transmission Line Final EIS
Table D.16-15. Acreage Comparison of Operations Disturbance to Stream Buffers

Within 100 feet of 

Ephemeral Streams

Withi

Disturbed Acres

% of Total 

Disturbance Area Disturbed Acres

% of Total 

Disturbance Area Distu

1W(a) Proposed – Total Length 73.8 40 22.6 10 5.7 

Proposed – Comparison portion for Alternative 1W(a)-B 16.5 8 27.8 1 1.9 Alternative 1W(a)-B 20.9 6 14.7 1 1.6 1W(c) Proposed – Total Length 73.6 19 15.0 9 7.2 

Proposed – Total Length 91.9 25 10.4 13 5.2 

Proposed – Comparison portion for Alternative 2A 16.8 3 9.1 2 5.8 Alternative 2A 16.0 1 2.0 3 8.6 

Proposed – Comparison portion for Alternative 2B 12.5 3 12.1 1 5.8 

Alternative 2B 12.2 1 4.9 2 9.4 

Segment 3 Proposed – Total Length 45.9 10 7.2 15 11.0 

Segment 3A Proposed – Total Length 5.1 1 8.2 1 8.4 Proposed – Total Length 197.6 75 14.1 27 5.1 Proposed – Comparison portion for Alternatives 4B-4F 85.2 41 19.4 11 5.2 

Alternative 4B 100.2 43 15.8 24 8.8 Alternative 4C 101.6 39 14.7 21 8.0 Alternative 4D 100.8 43 15.4 27 9.5 Alternative 4E 102.2 39 14.5 22 8.3 Alternative 4F 87.5 41 19.2 11 5.2 

Proposed – Total Length 55.7 <1 22 13.1 

Proposed – Comparison portion for Alternatives 5A,B 22.3 10 17.0 

Alternative 5A 29.7 15 18.7 9 11.1 

Alternative 5B 40.4 19 20.9 9 10.0 

Proposed – Comparison portion for Alternatives 5C 32.9 <1 21 22.2 

Alternative 5C 26.0 1 1.6 7 11.8 

Proposed – Comparison portion for Alternatives 5D 19.2 <1 11 17.6 

Alternative 5D 17.0 3 6.2 6 10.6 

Proposed – Comparison portion for Alternatives 5E 5.8 Alternative 5E 5.3 

6 Proposed – Total Length 0.5 

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, aNotes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero acres or null value

Notes: Acreages for TMDL and 303(d) listed streams overlap with perennial, intermittent, and ephemeral disturbance acres and are not included in the total disturbed acres column

Segment Length 

(Miles)

1W

2

Within 500 feet of Perennial and 

Intermittent Streams

Proposed or Alternative Name

Segment 

Number

41/

53

1/ Alternative 4G was added in late 2012 and was therefore not added to this table

Table D.16-15 Page 1 of 2

Gateway West Transmission Line Final EIS
Table D.16-15. Acreage Comparison of Operations Disturbance to Stream Buffers cont.

Within 100 feet of 

Ephemeral Streams

Withi

Disturbed Acres

% of Total 

Disturbance Area Disturbed Acres

% of Total 

Disturbance Area Distu

Proposed – Total Length 118.2 14 5.1 20 7.6 Proposed – Comparison portion for Alternatives 7A,B 35.1 0.0 12 16.4 

Alternative 7A 37.7 18 18.9 11 11.6 

Alternative 7B 46.2 18 19.2 11 11.1 

Proposed – Comparison portion for Alternative 7C 20.1 1 3.5 1 1.6 

Alternative 7C 20.3 1 2.1 2 7.0 

Proposed – Comparison portion for Alternative 7D 6.2 1 8.9 1 11.1 Alternative 7D 6.8 1 7.7 1 9.1 Proposed – Comparison portion for Alternative 7E 3.8 2 35.8 Alternative 7E 4.5 3 36.7 Proposed – Comparison portion for Alternative 7F 10.5 9 39.1 1 2.2 

Alternative 7F 10.8 8 33.1 1 4.8 

Proposed – Comparison portion for Alternative 7G 3.3 Alternative 7G 3.4 Proposed – Comparison portion for Alternative 7K 118.2 14 5.2 20 7.5 Alternative 7K 148.1 53 13.9 33 8.6 Proposed – Total Length 131.5 12 4.8 15 5.9 Proposed – Comparison portion for Alternative 8A 51.9 3 3.3 2 2.5 

Alternative 8A 53.6 2 2.3 1 1.3 

Proposed – Comparison portion for Alternative 8B 45.3 3 3.7 7 8.4 

Alternative 8B 45.8 2 2.5 4 6.4 

Proposed – Comparison portion for Alternative 8C 6.5 2 11.7 1 8.0 Alternative 8C 6.4 2 13.0 1 7.3 Proposed – Comparison portion for Alternative 8D 6.9 <1 

Alternative 8D 8.1 1 5.1 

Proposed – Comparison portion for Alternative 8E 7.0 <1 <1 

Alternative 8E 18.3 1 2.7 1 3.4 

Proposed – Total Length 162.2 21 5.8 17 4.8 Proposed – Comparison portion for Alternative 9A 7.8 1 3.4 <1 

Alternative 9A 7.7 1 9.2 <1 

Proposed – Comparison portion for Alternative 9B 49.1 10 7.8 3 2.5 

Alternative 9B 52.3 3 3.9 3 3.9 

Proposed – Comparison portion for Alternative 9C 14.4 1 4.1 

Alternative 9C 14.4 <1 1 2.3 

Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 3 3.0 7 6.9 

Alternative 9D 60.1 3 4.0 

Alternative 9F 63.3 5 4.9 

Alternative 9G 57.8 4 4.2 

Alternative 9H 61.0 5 5.0 

Proposed – Comparison portion for Alternative 9E (revised) 61.4 3 2.6 9 7.8 

Alternative 9E (revised) 70.6 4 3.0 14 10.4 

10 Proposed – Total Length 34.4 1 1.3 1 1.0 

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, a

Notes: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactlyNotes: Blank cells indicate zero acres or null valueNotes: Acreages for TMDL and 303(d) listed streams overlap with perennial, intermittent, and ephemeral disturbance acres and are not included in the total disturbed acres column

9

Proposed or Alternative Name 

Segment Length 

(Miles)

87

Within 500 feet of Perennial and 

Intermittent Streams

Segment 

Number

Table D.16-15 Page 2 of 2

Gateway West Transmission Line Final EIS
Table D.17-1. Specific Land Uses Crossed within 1,000 Feet of Proposed Route Alternatives

Route Name Route Type Closest Milepost or Milepost Span Land Use Featu

Segment 1W(a) Proposed - Total Length Proposed Route 0.4 - 1.0, 1.8 - 2.7 Oregon Trail 

0.5 - 1.2 California Trail 1.9 - 2.5 Mormon Pioneer Trail 1.9 - 2.5 National Historic Trails 1.9 - 2.5 Pony Express Trail 

2.1 Gravel Pit 2.5 Residence 

2.5 Residence 

2.6 Residence 

13.5 Structure 

15.6 Residence 18.1 Outbuilding 

18.6 Cabin 

28.6 - 31.1 Medicine Bow NF 29.0 - 39.6 Bates Hole MA 34.6 - 57.6 Shirley Basin 

68.5 Outbuilding 

68.7 Barn 68.7 Barn 68.7 Barn 68.7 Residence 68.7 Residence 71.4 Ellis Ranch Airport 

Alternative 1W(a)-B Feasible Alternative 3.7 Residence 

3.7 Residence 3.7 Residence 3.8 Building/Industrial 

3.8 Residence 

7.4 - 8.0 Bozeman Trail 

8.2 - 9.6 Oregon Trail 

8.4 - 9.1 California Trail 

8.7 Residence 

8.7 Residence 9.1 Building/Industrial 

9.1 Residence 

9.1 - 9.7 Mormon Pioneer Trail 9.1 - 9.7 National Historic Trails 

Segment 1W(c) Proposed - Total Length Proposed Route 0.0 - 1.2 Oregon Trail 

0.6 - 1.4 Pony Express Trail 

1.1 Outbuilding 

1.2 Tower 

1.3 Residence 

1.5 Residence 1.6 Residence 1.7 Residence 1.7 Residence 1.7 Residence 1.7 Residence 1.7 Residence 1.7 Residence 1.8 Residence 1.8 Residence 1.8 Residence 1.8 Residence 1.8 Residence 1.9 Residence 1.9 Residence 1.9 Residence 1.9 Residence 1.9 Residence 

2 Residence 

2.1 Residence 

Table D.17-1. Page 1 of 23

Gateway West Transmission Line Final EIS
Table D.17-1. Specific Land Uses Crossed within 1,000 Feet of Proposed Route Alternatives cont.

Route Name Route Type Closest Milepost or Milepost Span Land Use Featu

Segment 1W(c) Proposed - Total Length (cont.) Proposed Route (cont.) 2.1 Residence 

2.3 Residence 

7.2 Structure 

10 Barn 

14.2 Canal 

14.5 Residence 19.3 Park 

27.2 - 29.6 Medicine Bow NF 27.8 - 38.3 Bates Hole MA 

33.3 - 35.0, 35.7 - 42.6 Shirley Basin 

41.8 Reservoir 

44.4 Substation 

45.4 Structure 64.9 Structure 67.3 Foxley Landing Strip 

Segment 2 Proposed - Total Length Proposed Route 1.8 Wind Farm 

5.5 Mine 

5.9 Structure 

32.3 Barn 

32.3 Outbuilding 

32.3 Residence 32.4 Barn 

32.4 Outbuilding 

32.4 Outbuilding 32.4 Outbuilding 

37.4 - 37.7 North Platte SRMA 

37.8 Sand Pit 

54.2 - 54.8, 57.3 - 58.1 Historic Trails 

57.4 - 57.7 Hogback Lake Proposed SRMA 

57.4 - 57.7 OHV SRMA 57.4 - 57.7 Rawlins OHV Area 

63.2 - 63.6, 64.3 - 69.7 Red Rim-Daley Wildlife HMA 

81.7 Oil/Gas Well 

84.3 Structure 84.7 Structure 85.6 Structure 

86.1 Structure 

86.6 Structure 

87.4 Structure 87.9 Structure 90.9 Structure 

91.8 Structure 

Alternative 2A Feasible Alternative 9.5 Gravel Pit 

9.7 Barn 

10.3 Fort Fred Steele State Historic Site 

Alternative 2B Feasible Alternative 5.6 Gravel Pit 

6.4 Mine 

6.6 Residence 

6.6 Residence 6.6 Residence 

6.6 Residence 

6.7 Residence 6.7 Residence 

Segment 3 Proposed - Total Length Proposed Route 0 Structure 

1 Structure 

1.3 Structure 1.5 Structure 1.6 Structure 

2.2 Structure 

2.6 Structure 

Table D.17-1. Page 2 of 23

Gateway West Transmission Line Final EIS
Table D.17-1. Specific Land Uses Crossed within 1,000 Feet of Proposed Route Alternatives cont.

Route Name Route Type Closest Milepost or Milepost Span Land Use Featu

Segment 3 Proposed - Total Length (cont.) Proposed Route (cont.) 2.8 Structure 

3.2 - 9.1 Upper Muddy Creek Watershed 

4.2 Structure 

5.2 Oil/Gas Well 5.7 Structure 

32.1 Oil Field 

37.0 - 45.94 Point of Rocks MOA 

Segment 3A Proposed - Total Length Proposed Route 0.0 - 5.13 Point of Rocks MOA 

Segment 4 Proposed - Total Length1/ Proposed Route 0.0 - 11.7 Point of Rocks MOA 

51.4 - 52.6 Seedskadee NWR 

52.2 Building/Industrial 

52.6 Seedskadee National Wildlife Refu

56.9 - 57.5 California Trail 56.9 - 57.5 National Historic Trails 56.9 - 57.5 Oregon Trail 

61.9 - 62.5 Pony Express Trail 

63.3 White-tailed Prairie Dog Complex 

65.0 - 66.5, 67.0 - 70.1 White-tailed Prairie Dog Complex 

80.2 Oil/Gas Well 

91.3 - 91.5, 91.7 - 92.0 White-tailed Prairie Dog Complex 

95.6 Structure 

96.1 - 117.7, 117.8 - 118.1, 118.2 - 119.1, 120.8 - 122.8 Commissary Ridge Raptor Migratio

100.7 - 106.5 Historic Trail - Medium Quality (500

101.8 - 102.4 NHT Physical Trace 

102.0 - 102.7 California Trail 

105.1 Reservoir 105.3 Reservoir 

105.4 - 106.5, 107.5 - 107.8, 108.0 - 110.4, 111.9 - 112.2, 113.9 - 114.5 Dempsey Ridge SRMA 

107.2 - 108.3 Historic Trail - High Quality (0.25mi 

111.0 - 111.7 Dempsey SRMA 

111.9 - 117.0 Historic Trail - High Quality (0.25mi 

112.2 - 113.5 Dempsey SRMA 

112.4 Dempsey SRMA 112.5 Special Status Plant - 250ft buffer 112.5 Special Status Plant Population 

112.7 - 113.4, 114.9 - 115.6 NHT Physical Trace 

112.9 - 113.5 California Trail 

114.7 - 115.6 California Trail 

115.3 - 117.6, 117.7 - 119.2 Rock Creek/Tunp SMA 

121.2 - 124.0 Historic Trail - Low Quality (100ft B

122.3 - 123.3 California Trail 

122.8 Cokeville Meadows National Wildlif

122.8 - 124.4 Cokeville Meadows National Wildlif

122.9 Shed 

123 Cokeville Meadows National Wildlif

123 Residence 

123.4 Cokeville Meadows National Wildlif

123.5 Cokeville Meadows National Wildlif123.8 Residence 

124.9 Building/Industrial 

133.9 - 134.0 Canal 138.1 - 138.7 National Historic Trails 

138.1 - 138.7 Oregon Trail 

139.4 Reservoir 

145.9 Shed 

146.8 Residence 

146.9 Residence 

146.9 Residence 

147.0 - 147.7 California Trail 

1/ Alternative 4G was added in late 2012 and was therefore not added to this table

Table D.17-1. Page 3 of 23

Gateway West Transmission Line Final EIS
Table D.17-1. Specific Land Uses Crossed within 1,000 Feet of Proposed Route Alternatives cont.

Route Name Route Type Closest Milepost or Milepost Span Land Use Featu

Segment 4 Proposed - Total Length (cont.) Proposed Route (cont.) 147.0 - 147.7 National Historic Trails 

147.0 - 147.7 Oregon Trail 

147.3 Residence 

147.6 Residence 

147.6 Structure 

147.7 Residence 

147.9 Outbuilding 

147.9 Outbuilding 

148 Outbuilding 

149.9 Structure 

151.5 Outbuilding 

151.6 Barn 

151.7 Barn 

151.7 Outbuilding 

151.7 Outbuilding 151.7 Outbuilding 151.7 Outbuilding 152.1 Substation 

154.5 Shed 

156.3 Spring 

156.9 Gravel Pit 

161.1 - 170.3 Caribou NF 

167.1 Spring 

171.5 Residence 

171.6 Residence 173.8 Barn 173.8 Outbuilding 

173.9 Outbuilding 173.9 Residence 

174.4 Outbuilding 

174.5 - 173.9 California Trail 

177.1 Mine 

177.5 Structure 

190.8 Shed 

194.7 Silo 

195.6 Downey (Hyde Memorial) Airport 

196.4 Outbuilding 

196.4 Outbuilding 196.4 Residence 

Alternative 4B Feasible Alternative 0.0 - 0.9 Seedskadee NWR 

8.4 - 13.5 Historic Trail - Low Quality (100ft B

9.2 - 9.8 California Trail 9.2 - 9.8 National Historic Trails 9.2 - 9.8 Oregon Trail 

9.5 - 9.7, 12.0 - 12.3 NHT Physical Trace 

12.0 - 12.7 Pony Express Trail 

16 Oil/Gas Well 

37.5 Spring 

43.5 Mine 43.5 Structure 47.9 Mine 

47.9 - 73.0 Commissary Ridge Raptor Migratio

52.3 Dam 

53 Residence 

54.5 Special Status Plant - 250ft buffer 

54.5 Special Status Plant Population 60.3 Spring 

62.5 - 63.1, 63.6 - 64.9, 65.1 - 67.7, 69.9 - 70.1 Bear River SMA 

63.0 - 63.7 Bear River SMA 64.1 - 65.0 California Trail 

Table D.17-1. Page 4 of 23

Gateway West Transmission Line Final EIS
Table D.17-1. Specific Land Uses Crossed within 1,000 Feet of Proposed Route Alternatives cont.

Route Name Route Type Closest Milepost or Milepost Span Land Use FeatuAlternative 4B (cont.) Feasible Alternative (cont.) 65 Special Status Plant Population 

65 Special Status Plant - 250ft buffer 

65.1 - 65.4 Special Status Plant - 250ft buffer 

65.3 Special Status Plant Population 

68.1 - 68.7 Bear River SMA 

72.2 - 72.4 Cokeville Meadows National Wildlif

72.2 - 76.9 Cokeville Meadows National Wildlif72.3 - 73.3 Cokeville Meadows National Wildlif72.6 - 75.7 Historic Trail - Low Quality (100ft B

72.8 Cokeville Meadows National Wildlif

73.1 Pivot 

73.2 - 74.2 Cokeville Meadows National Wildlif

73.9 - 74.8 California Trail 

74 Pivot 

74.1 - 74.6 Cokeville Meadows National Wildlif

74.2 Cokeville Meadows National Wildlif

74.2 Dam 

74.2 - 74.3 NHT Physical Trace 

74.2 - 76.8 Cokeville Meadows National Wildlif

74.5 - 75.1 Cokeville Meadows National Wildlif75.0 - 75.7 Cokeville Meadows National Wildlif75.6 - 76.0 Cokeville Meadows National Wildlif75.9 - 76.5 Cokeville Meadows National Wildlif76.4 - 76.7 Cokeville Meadows National Wildlif76.6 - 76.9 Cokeville Meadows National Wildlif

83.6 Cokeville Meadows National Wildlif

Alternative 4C Feasible Alternative 0.0 - 0.9 Seedskadee NWR 

8.4 - 13.5 Historic Trail - Low Quality (100ft B

9.2 - 9.8 California Trail 9.2 - 9.8 National Historic Trails 9.2 - 9.8 Oregon Trail 

9.5 - 9.7, 12.0 - 12.3 NHT Physical Trace 

12.0 - 12.7 Pony Express Trail 

16 Oil/Gas Well 

37.5 Spring 

43.5 Mine 43.5 Structure 47.9 Mine 

47.9 - 71.8, 72.4 - 75.5, 78.0 - 78.5 Commissary Ridge Raptor Migratio

52.3 Dam 

53 Residence 

54.5 Special Status Plant - 250ft buffer 

54.5 Special Status Plant Population 60.3 Spring 

62.5 - 63.1, 63.6 - 64.9, 65.1 - 67.2 Bear River SMA 

63.0 - 63.7 Bear River SMA 64.1 - 65.0 California Trail 

65 Special Status Plant - 250ft buffer 65 Special Status Plant Population 

65.1 - 65.4 Special Status Plant - 250ft buffer 

65.3 Special Status Plant Population 67.9 Bear River SMA 

69.6 - 71.8, 72.4 - 74.4, 80.6 - 80.9 Rock Creek/Tunp SMA 

69.7 Tower 71.2 Cokeville Meadows National Wildlif

71.6 Cokeville Meadows National Wildlif71.7 Cokeville Meadows National Wildlif71.9 Cokeville Meadows National Wildlif

73.9 Cokeville Meadows National Wildlif

74.5 Cokeville Meadows National Wildlif

Table D.17-1. Page 5 of 23

Gateway West Transmission Line Final EIS
Table D.17-1. Specific Land Uses Crossed within 1,000 Feet of Proposed Route Alternatives cont.

Route Name Route Type Closest Milepost or Milepost Span Land Use FeatuAlternative 4C (cont.) Feasible Alternative (cont.) 74.6 Cokeville Meadows National Wildlif

74.7 - 75.0 Rock Creek/Tunp Draft Preferred A

74.8 Cokeville Meadows National Wildlif

75.2 Cokeville Meadows National Wildlif75.5 Cokeville Meadows National Wildlif75.9 Cokeville Meadows National Wildlif

76.1 - 78.8 Historic Trail - Low Quality (100ft B

76.5 Cokeville Meadows National Wildlif

76.6 - 77.1 Cokeville Meadows National Wildlif

76.7 Shed 76.9 Barn 76.9 Cokeville Meadows National Wildlif76.9 Cokeville Meadows National Wildlif

77.0 - 83.4 California Trail 

77.3 Cokeville Meadows National Wildlif

77.3 Substation 77.6 Cokeville Meadows National Wildlif77.8 Barn 77.8 NHT Physical Trace 

78 Shed 

78.1 Cokeville Meadows National Wildlif

78.3 Gravel Pit 78.4 Cokeville Meadows National Wildlif79.3 Cokeville Meadows National Wildlif79.5 Barn 79.5 Cokeville Meadows National Wildlif

79.8 - 82.4 Historic Trail - High Quality (0.25mi 

80.8 Canal 

80.8 - 80.9 NHT Physical Trace 

81.2 Residence 

81.2 - 81.3 NHT Physical Trace 

81.3 Cokeville Meadows National Wildlif

82.1 Cokeville Meadows National Wildlif82.1 Special Status Plant - 250ft buffer 82.1 Special Status Plant Population 82.4 Cokeville Meadows National Wildlif82.4 Commercial Building 

82.7 Commercial Building 

82.9 - 83.7 Cokeville Meadows National Wildlif

82.9 - 85.2 Cokeville Meadows National Wildlif82.9 - 85.4 Cokeville Meadows National Wildlif83.6 - 83.8 Cokeville Meadows National Wildlif83.7 - 84.2 Cokeville Meadows National Wildlif

84.1 Cokeville Meadows National Wildlif

84.1 - 85.4 Cokeville Meadows National Wildlif

85.8 Cokeville Municipal Airport 

Alternative 4D Feasible Alternative 0.0 - 0.9 Seedskadee NWR 

8.4 - 13.5 Historic Trail - Low Quality (100ft B

9.2 - 9.8 California Trail 9.2 - 9.8 National Historic Trails 9.2 - 9.8 Oregon Trail 

9.5 - 9.7, 12.0 - 12.3 NHT Physical Trace 

12.0 - 12.7 Pony Express Trail 

16 Oil/Gas Well 

37.5 Spring 

43.5 Mine 43.5 Structure 47.9 Mine 

47.9 - 73.6 Commissary Ridge Raptor Migratio

52.3 Dam 

Table D.17-1. Page 6 of 23

Gateway West Transmission Line Final EIS
Table D.17-1. Specific Land Uses Crossed within 1,000 Feet of Proposed Route Alternatives cont.

Route Name Route Type Closest Milepost or Milepost Span Land Use FeatuAlternative 4D (cont.) Feasible Alternative (cont.) 53 Residence 

56.3 Mine 

63.1 - 63.7, 64.2 - 65.5, 65.7 - 68.4, 70.5 - 70.7 Bear River SMA 

63.6 - 64.3 Bear River SMA 

64.7 - 65.6 California Trail 

65.6 Special Status Plant - 250ft buffer 

65.6 Special Status Plant Population 

65.7 - 66.0 Special Status Plant - 250ft buffer 

65.9 Special Status Plant Population 

68.7 - 69.3 Bear River SMA 

72.0 - 77.5 Cokeville Meadows National Wildlif

72.8 - 73.0 Cokeville Meadows National Wildlif72.9 - 73.9 Cokeville Meadows National Wildlif73.2 - 76.3 Historic Trail - Low Quality (100ft B

73.5 Cokeville Meadows National Wildlif

73.7 Pivot 

73.8 - 74.8 Cokeville Meadows National Wildlif

74.5 - 75.4 California Trail 

74.6 Pivot 

74.7 - 75.2 Cokeville Meadows National Wildlif

74.8 Cokeville Meadows National Wildlif

74.8 Dam 

74.8 - 74.9 NHT Physical Trace 

74.8 - 77.4 Cokeville Meadows National Wildlif

75.1 - 75.7 Cokeville Meadows National Wildlif75.6 - 76.3 Cokeville Meadows National Wildlif76.2 - 76.6 Cokeville Meadows National Wildlif76.5 - 77.1 Cokeville Meadows National Wildlif77.0 - 77.4 Cokeville Meadows National Wildlif77.3 - 77.5 Cokeville Meadows National Wildlif

84.2 Cokeville Meadows National Wildlif

Alternative 4E Feasible Alternative 0.0 - 0.9 Seedskadee NWR 

8.4 - 13.5 Historic Trail - Low Quality (100ft B

9.2 - 9.8 California Trail 9.2 - 9.8 National Historic Trails 9.2 - 9.8 Oregon Trail 

9.5 - 9.7, 12.0 - 12.3 NHT Physical Trace 

12.0 - 12.7 Pony Express Trail 

16 Oil/Gas Well 

37.5 Spring 

43.5 Mine 43.5 Structure 47.9 Mine 

47.9 - 72.4, 73.0 - 76.1, 78.6 - 79.1 Commissary Ridge Raptor Migratio

52.3 Dam 

53 Residence 

56.3 Mine 

63.1 - 63.7, 64.2 - 65.5, 65.7 - 67.8 Bear River SMA 

63.6 - 64.3 Bear River SMA 

64.7 - 65.6 California Trail 

65.6 Special Status Plant - 250ft buffer 

65.6 Special Status Plant Population 

65.7 - 66.0 Special Status Plant - 250ft buffer 

65.9 Special Status Plant Population 

68.5 Bear River SMA 

70.2 - 72.4, 73.0 - 75.0, 81.2 - 81.5 Rock Creek/Tunp SMA 

70.3 Tower 71.8 Cokeville Meadows National Wildlif

72.2 Cokeville Meadows National Wildlif72.3 Cokeville Meadows National Wildlif

Table D.17-1. Page 7 of 23

Gateway West Transmission Line Final EIS
Table D.17-1. Specific Land Uses Crossed within 1,000 Feet of Proposed Route Alternatives cont.

Route Name Route Type Closest Milepost or Milepost Span Land Use FeatuAlternative 4E (cont.) Feasible Alternative (cont.) 72.5 Cokeville Meadows National Wildlif

74.5 Cokeville Meadows National Wildlif

75.1 Cokeville Meadows National Wildlif

75.2 Cokeville Meadows National Wildlif

75.3 - 75.7 Rock Creek/Tunp Draft Preferred A

75.4 Cokeville Meadows National Wildlif

75.8 Cokeville Meadows National Wildlif76.1 Cokeville Meadows National Wildlif76.5 Cokeville Meadows National Wildlif

76.7 - 79.4 Historic Trail - Low Quality (100ft B

77.1 Cokeville Meadows National Wildlif

77.2 - 77.7 Cokeville Meadows National Wildlif

77.3 Shed 77.5 Barn 77.5 Cokeville Meadows National Wildlif77.5 Cokeville Meadows National Wildlif

77.6 - 84.0 California Trail 

77.9 Cokeville Meadows National Wildlif

77.9 Substation 78.2 Cokeville Meadows National Wildlif78.4 Barn 78.4 NHT Physical Trace 

78.6 Shed 

78.7 Cokeville Meadows National Wildlif

78.9 Gravel Pit 

79 Cokeville Meadows National Wildlif

79.9 Cokeville Meadows National Wildlif80.1 Barn 

80.4 - 83.0 Historic Trail - High Quality (0.25mi 

81.4 Canal 

81.4 - 81.5 NHT Physical Trace 

81.5 Cokeville Meadows National Wildlif

81.8 Residence 

81.8 - 81.9 NHT Physical Trace 

81.9 Cokeville Meadows National Wildlif

82.1 Cokeville Meadows National Wildlif82.7 Special Status Plant - 250ft buffer 82.7 Special Status Plant Population 

83 Cokeville Meadows National Wildlif

83 Commercial Building 

83.4 Commercial Building 

83.5 - 84.3 Cokeville Meadows National Wildlif

83.5 - 85.8 Cokeville Meadows National Wildlif83.5 - 86.0 Cokeville Meadows National Wildlif84.2 - 84.4 Cokeville Meadows National Wildlif84.3 - 84.8 Cokeville Meadows National Wildlif

84.7 Cokeville Meadows National Wildlif

84.7 - 86.0 Cokeville Meadows National Wildlif

86.4 Cokeville Municipal Airport 

Alternative 4F Feasible Alternative 0.0 - 0.9 Seedskadee NWR 

0.6 Building/Industrial 

1 Seedskadee National Wildlife Refu

5.4 - 6.0 California Trail 5.4 - 6.0 National Historic Trails 5.4 - 6.0 Oregon Trail 

10.3 - 10.9 Pony Express Trail 

11.7 White-tailed Prairie Dog Complex 

13.4 - 14.9, 15.4 - 18.5 White-tailed Prairie Dog Complex 

28.6 Oil/Gas Well 

39.7 - 40.0, 40.1 - 40.4 White-tailed Prairie Dog Complex 

Table D.17-1. Page 8 of 23

Gateway West Transmission Line Final EIS
Table D.17-1. Specific Land Uses Crossed within 1,000 Feet of Proposed Route Alternatives cont.

Route Name Route Type Closest Milepost or Milepost Span Land Use FeatuAlternative 4F (cont.) Feasible Alternative (cont.) 44 Structure 

44.5 - 70.2, 73.0 - 74.5 Commissary Ridge Raptor Migratio

49.1 - 52.0 Historic Trail - Medium Quality (500

50.2 - 50.8 NHT Physical Trace 

50.4 - 51.2 California Trail 

56.4 - 58.5, 58.6 - 59.7, 60.0 - 62.1, 62.2 - 62.7, 63.3 - 63.5 Dempsey Ridge SRMA 

60.5 - 63.0 Historic Trail - High Quality (0.25mi 

60.7 - 62.1 Historic Trail - Low Quality (100ft B61.2 - 61.8 California Trail 

61.3 - 61.9 NHT Physical Trace 

63 Dempsey SRMA 

64.0 - 66.6, 67.1 - 67.3, 67.5 - 68.9 Dempsey SRMA 

69 Pine Creek Ski Area 

70.7 Pivot 

71.6 Residence 71.6 Silo 

71.8 Pivot 

72.2 Canal 

72.9 Barn 

73 Pivot 

74.8 Raymond Mountain WSA 

75.9 - 76.6 California Trail 

76.4 Pivot 76.4 Residence 76.6 Residence 

84.7 - 84.8 Canal 

Segment 5 Proposed - Total Length Proposed Route 3.1 Residence 

3.5 Residence 

3.6 Residence 3.7 Residence 5.4 Residence 8.4 Caribou NF 

8.4 Residence 

8.8 Residence 

9 Residence 

9.4 Residence 

12.2 Tower 

12.2 Tower 12.3 Tower 

12.3 Tower 

12.3 Tower 12.4 Tower 

13.2 - 14.1 California Trail 

25.2 Residence 

25.3 School 

52.4 Residence 52.5 Commercial Building 

52.7 Residence 52.7 Residence 52.9 Barn 52.9 Barn 

53 Barn 53 Residence 

53 Residence 

53.1 Residence 

53.1 Residence 53.1 Residence 53.3 Residence 53.4 Residence 53.4 Residence 

Table D.17-1. Page 9 of 23

Gateway West Transmission Line Final EIS
Table D.17-1. Specific Land Uses Crossed within 1,000 Feet of Proposed Route Alternatives cont.

Route Name Route Type Closest Milepost or Milepost Span Land Use Featu

Segment 5 Proposed - Total Length (cont.) Proposed Route (cont.) 53.6 - 54.2 National Historic Trails 

53.6 - 54.2 Oregon Trail 

55 Mine 

55.66 Substation 

Alternative 5A Feasible Alternative 9.1 Residence 

11.8 Cemetery 

22.3 Residence 

27 Residence 

29.5 Residence 

Alternative 5B Feasible Alternative 18.5 Residence 

31.7 Residence 

33.6 Residence 34.6 Pivot 

37.7 Residence 

40.2 Residence 

Alternative 5D Feasible Alternative 1.2 Residence 

10.5 Residence 12.9 Residence 

12.9 Residence 12.9 Residence 13.1 Residence 13.2 Residence 13.6 Residence 14.1 Residence 

14.5 Residence 

14.6 Residence 14.6 Residence 14.9 Residence 

15 Residence 

15.0 - 15.7 National Historic Trails 

15.0 - 15.7 Oregon Trail 

15.1 Residence 15.1 Residence 15.2 Residence 15.2 Residence 15.2 Residence 15.3 Residence 15.3 Residence 15.3 Residence 15.4 Residence 15.5 Residence 15.9 Borrow Pit 

17.04 Substation 

Alternative 5E Feasible Alternative 0.2 Tower 

0.2 Tower 

0.4 Tower 

0.4 Tower 

0.6 Tower 

0.7 Tower 0.8 Tower 0.9 Tower 

1 Tower 

1.1 Tower 1.3 Tower 1.3 Tower 1.5 Tower 1.6 Tower 1.8 Tower 1.8 Tower 

2 Barn 

Table D.17-1. Page 10 of 23

Gateway West Transmission Line Final EIS
Table D.17-1. Specific Land Uses Crossed within 1,000 Feet of Proposed Route Alternatives cont.

Route Name Route Type Closest Milepost or Milepost Span Land Use FeatuAlternative 5E (cont.) Feasible Alternative (cont.) 2 Outbuilding 

2 Outbuilding 2 Residence 

2 Tower 

2.1 Tower 

2.2 Tower 

2.3 Tower 

2.4 Tower 

2.6 Commercial Building 

2.6 Tower 

2.6 Tower 

2.8 Tower 

2.9 Residence 

2.9 Tower 

3.0 - 3.8 National Historic Trails 3.0 - 3.8 Oregon Trail 

3.1 Tower 

3.1 Tower 3.5 Tower 

3.5 Tower 3.8 Tower 

3.9 Tower 

3.9 Tower 

4.2 Tower 

4.8 Mine 

5.2 Substation 

Segment 7 Proposed - Total Length Proposed Route 0.5 Residence 

2.9 Residence 

5 Residence 

7.9 - 8.6 Caribou NF 

8.1 Residence 

10 Elkhorn Mtn. 

13.1 - 13.7 California Trail 

24.8 Residence 

43.1 Barn 

55.4 Pivot 

55.7 Irrigated Ag 

56 Pivot 

58.1 - 58.2 Pivot 

58.9 Pivot 

59.1 - 59.2 Pivot 59.2 - 60.0 National Historic Trails 

59.2 - 60.0 Oregon Trail 

59.7 Pivot 

60.1 Oregon-California Trail Junction 

61.1 - 61.2 Pivot 61.2 - 61.3 Pivot 61.4 - 61.5 Irrigated Ag 

61.7 - 61.8 Pivot 

61.8 Pivot 

61.9 - 62.0 Irrigated Ag 

71.5 Tower 

71.5 Tower 71.7 Structure 

72.6 - 73.4 National Historic Trails 

72.6 - 73.4 Oregon Trail 

75.4 - 75.5 Irrigated Ag 

75.5 Pivot 

75.5 - 75.6 Pivot 76.0 - 76.1 Pivot 

Table D.17-1. Page 11 of 23

Gateway West Transmission Line Final EIS
Table D.17-1. Specific Land Uses Crossed within 1,000 Feet of Proposed Route Alternatives cont.

Route Name Route Type Closest Milepost or Milepost Span Land Use Featu

Segment 7 Proposed - Total Length (cont.) Proposed Route (cont.) 82.6 Residence 

82.7 Residence 82.8 Residence 

82.9 Residence 83.7 Outbuilding 

83.7 Residence 83.7 Residence 

86.5 - 87.1, 87.4 - 88.2 Ag Landing Strip 

87.0 - 87.5 Ag Landing Strip 

87.4 Airport 

87.4 Landing Strip 

92.7 Residence 94.6 Residence 94.7 Residence 

96.7 Residence 97.2 Residence 98.1 Residence 98.9 Outbuilding 

100.2 Residence 

100.3 Residence 

103 CAFO 

108.3 - 118.16 South Hills 

109.4 Outbuilding 

112.5 CAFO 

112.6 - 114.5, 114.7 - 116.5 Dry Creek Sky Ranches (proposed

114.3 Cemetery 

114.4 - 114.8 Dry Creek Sky Ranches (proposed

114.6 Airport 

114.6 Landing Strip (proposed) 

114.7 Residence 

Alternative 7A Feasible Alternative 0.0 - 1.4 Caribou NF 

1.7 - 2.5 California Trail 

23.9 Residence 25.7 Residence 25.8 Residence 

Alternative 7B Feasible Alternative 0.0 - 1.4 Caribou NF 

1.7 - 2.5 California Trail 

5.2 Residence 

19.8 Residence 20.7 Residence 

Alternative 7C Feasible Alternative 7.2 Pivot 

7.4 Pivot 

8.0 - 8.1 Pivot 

8.1 Pivot 

8.6 Pivot 

9 CAFO 

9.1 Pivot 

9.2 - 9.3 Pivot 

9.2 - 10.4 California Trail 

9.4 Pivot 9.6 Residence 

9.6 Residence 

9.7 - 9.8 Pivot 

9.8 Pivot 

15.9 - 17.0 National Historic Trails 

15.9 - 17.0 Oregon Trail 

Alternative 7D Feasible Alternative 1.1 - 2.7 National Historic Trails 

1.1 - 2.7 Oregon Trail 

3.0 - 3.1 Pivot 

3.5 Pivot 

Table D.17-1. Page 12 of 23

Gateway West Transmission Line Final EIS
Table D.17-1. Specific Land Uses Crossed within 1,000 Feet of Proposed Route Alternatives cont.

Route Name Route Type Closest Milepost or Milepost Span Land Use FeatuAlternative 7D (cont.) Feasible Alternative (cont.) 4 Irrigated Ag 

4.0 - 4.1 Pivot 

4.1 Pivot 

4.5 - 4.6 Pivot 

Alternative 7E Feasible Alternative 1.6 Spring 

3.9 Residence 

4 Outbuilding 

4 Residence 

4 Residence 

Alternative 7F Feasible Alternative 3.2 Spring 

9.4 Ag Landing Strip 

Alternative 7G Feasible Alternative 0 Cemetery 

0.0 - 0.1, 0.3 - 2.2 Dry Creek Sky Ranches (proposed

0.0 - 0.4 Dry Creek Sky Ranches (proposed

0.0 - 3.36 South Hills 

0.3 Residence 

Alternative 7K Feasible Alternative 0.5 Residence 

2.9 Residence 

5 Residence 

7.9 - 8.6, 11.7 - 13.1 Caribou NF 

8.1 Residence 

10 Elkhorn Mtn. 

13.4 - 14.2 California Trail 

16.9 Residence 

32.5 -43.3, 58.3 - 72.3, 75.3 - 75.7, 85.9 - 97.4 Raft River - Curlew Valley 

43.1 Curlew National Grasslands 

45.9 - 53.0 Sawtooth NF 

47.9 - 48.5 California Trail 

57.8 Silo 

57.8 Warehouse 

58.3 - 72.3, 75.3 - 75.7, 85.9 - 97.4 Raft River - Curlew Valley IBA 

63 Sawtooth NF 

82.4 - 83.2 California Trail 

100.4 Spring 

103.2 - 104.0 California Trail 

115.3 - 130.5, 131.7 - 148.11 South Hills 

134.6 - 140.4 Sawtooth NF 

Segment 8 Proposed - Total Length Proposed Route 2.2 Pivot 

3.3 Pivot 

3.7 Residence 

14.8 Residence 

14.9 Residence 

16.2 Residence 16.8 Residence 

16.9 Residence 

17 Residence 

17.2 Residence 17.3 Residence 17.4 CAFO 

17.5 Residence 19.3 Pivot 

19.9 Pivot 21.9 Gravel Pit 

22.1 Residence 22.4 Residence 26.6 Irrigation Ditch 

28.3 Residence 28.7 Pivot 44.4 Canal 

45.2 - 57.2 MUA-3 Lower Bennett 

Table D.17-1. Page 13 of 23

Gateway West Transmission Line Final EIS
Table D.17-1. Specific Land Uses Crossed within 1,000 Feet of Proposed Route Alternatives cont.

Route Name Route Type Closest Milepost or Milepost Span Land Use Featu

Segment 8 Proposed - Total Length (cont.) Proposed Route (cont.) 45.9 Spring 

46.8 - 47.4 Oregon Trail Rutted Segments 

50.1 - 50.5 Oregon Trail Rutted Segments 

52.7 Residence 

55.6 - 56.4 National Historic Trails 

55.6 - 56.4 Oregon Trail 

55.8 - 56.4 Oregon Trail Rutted Segments 

65.6 - 67.7, 98.7 - 126.6 Snake River Birds of Prey NCA 

65.7 - 67.7, 98.7 - 126.6 Snake River Birds of Prey 

70.9 Canal 

83.8 - 84.1, 85.8 - 89.8 LEPA MA 8 

94.0 - 98.8 LEPA MA 8B 

98.9 - 108.2 Orchard Training Area 

105.6 National Guard 

116.9 - 120.3 National Register Historic District 

117.8 - 120.0 Snake River Canyon SRMA 

118.4 - 123.9 Birds of Prey Avoidance Area 

120.5 Basin 

121.7 - 122.5 National Historic Trails 

121.7 - 122.5 Oregon Trail 

121.8 - 122.1 Oregon Trail SRMA 122.6 - 123.9 Private Landing Strip 

123.3 Private Landing Strip 

123.7 - 126.6 Owyhee Front SRMA 

123.8 - 130.9 Black Mountain HMA 

124 Residence 124 Residence 

124.1 Residence 

124.1 Residence 

129.3 CAFO 129.4 Structure 129.4 Structure 129.4 Structure 129.4 Structure 130.8 Residence 

130.9 Residence 

130.9 Residence 

131 Residence 131 Residence 

131.1 Residence 

131.1 Residence 

131.2 Residence 

131.5 Tower 131.5 Tower 

131.5 Tower 

Alternative 8A Feasible Alternative 1.5 Pivot 

4.3 Residence 

4.6 CAFO 4.6 Residence 

4.7 Animal Pen 

19.5 Residence 

20 Residence 

21.2 Pivot 23.3 Residence 23.6 Residence 

23.6 Residence 23.6 Residence 23.6 Residence 23.7 Residence 23.7 Residence 

Table D.17-1. Page 14 of 23

Gateway West Transmission Line Final EIS
Table D.17-1. Specific Land Uses Crossed within 1,000 Feet of Proposed Route Alternatives cont.

Route Name Route Type Closest Milepost or Milepost Span Land Use FeatuAlternative 8A (cont.) Feasible Alternative (cont.) 23.7 Residence 

23.7 Residence 23.7 Residence 23.8 Residence 23.8 Residence 23.8 Residence 23.8 Residence 23.9 Residence 23.9 Residence 23.9 Residence 23.9 Residence 23.9 Residence 23.9 Residence 23.9 Residence 23.9 Residence 23.9 Residence 

24 Residence 

24 Residence 

24 Residence 

24.1 Structure 24.2 Residence 24.2 Residence 24.2 Residence 24.3 Fish Farm 

24.4 - 25.7 MUA-8 Hagerman Fossil Beds 

25.6 - 46.5 MUA-7 Saylor Creek East 

27.2 Canal 30.7 Residence 31.2 Wind Farm 

33.0 - 33.8 National Historic Trails 

33.0 - 33.8 Oregon Trail 

33.5 - 34.0, 37.0 - 37.9 Oregon Trail SRMA 

37.3 - 38.1 National Historic Trails 

37.3 - 38.1 Oregon Trail 

43.6 Tower 

44.9 - 45.4 Oregon Trail SRMA 

45.9 Residence 

46 Residence 

46.1 Residence 46.2 Residence 46.2 Residence 46.2 Residence 46.2 Residence 46.3 Residence 46.3 Residence 46.4 Residence 46.4 Residence 46.4 Residence 

46.4 - 46.9 MUA-4 Snake River Riparian 

46.8 - 53.61 MUA-3 Lower Bennett 

50.7 - 51.0 LEPA MA 10 51.9 - 52.3 Oregon Trail Rutted Segments 

Alternative 8B Feasible Alternative 0.0 - 3.5 LEPA MA 8 

8.1 Animal Pen 

10.1 - 11.5, 13.0 - 13.7 LEPA MA 8B 

19.3 Residence 19.3 Residence 19.3 Residence 19.3 Residence 19.3 Residence 

Table D.17-1. Page 15 of 23

Gateway West Transmission Line Final EIS
Table D.17-1. Specific Land Uses Crossed within 1,000 Feet of Proposed Route Alternatives cont.

Route Name Route Type Closest Milepost or Milepost Span Land Use FeatuAlternative 8B (cont.) Feasible Alternative (cont.) 19.4 Residence 

19.4 Residence 19.4 Residence 19.4 Residence 19.4 Residence 19.4 Residence 

19.4 Residence 19.4 Residence 19.4 Residence 19.4 Residence 20.3 Residence 20.6 Residence 20.8 Residence 20.8 Residence 21.4 Residence 

24 Residence 

24.5 Residence 

26.2 - 27.1 Snake River Birds of Prey NCA 

26.5 Commercial Building 

27.0 - 27.6, 28.7 - 31.6 LEPA MA 6 

29.4 Gravel Pit 33.3 Residence 33.3 Residence 33.9 Residence 33.9 Residence 

34 Residence 

34.1 Residence 34.3 Residence 

34.3 Residence 

34.8 Silo 

35 Gravel Pit 

35.2 Snake River Birds of Prey 

37 Residence 

37.1 Animal Pen 

37.2 Residence 37.2 Residence 37.3 Residence 37.4 Residence 37.4 Residence 

37.7 Residence 37.8 Warehouse 37.9 Residence 37.9 Residence 38.5 Residence 

39 Residence 

39.4 Residence 39.7 Residence 40.4 Residence 42.1 Residence 42.2 Residence 

42.7 - 42.9 Deer Flat National Wildlife Refuge 

42.8 Deer Flat National Wildlife Refuge 

43.8 CAFO 43.8 Outbuilding 

43.8 Outbuilding 

43.9 CAFO 

43.9 Outbuilding 

43.9 Outbuilding 43.9 Outbuilding 

43.9 Outbuilding 

Table D.17-1. Page 16 of 23

Gateway West Transmission Line Final EIS
Table D.17-1. Specific Land Uses Crossed within 1,000 Feet of Proposed Route Alternatives cont.

Route Name Route Type Closest Milepost or Milepost Span Land Use FeatuAlternative 8B (cont.) Feasible Alternative (cont.) 43.9 Residence 

43.9 Residence 

43.9 Residence 

44 Residence 

44.2 Residence 44.3 Residence 44.6 Residence 44.9 Black Mountain HMA 44.9 Canal 

45.1 Residence 45.3 Residence 45.3 Residence 45.3 Residence 45.3 Residence 45.5 Residence 45.5 Residence 

43.5 - 44.1 National Historic Trails 

43.5 - 44.1 Oregon Trail 

Alternative 8C Feasible Alternative 0.0 - 0.1, 0.2 - 2.0 LEPA MA 8 

5.1 Residence 

Alternative 8D Feasible Alternative 0.0 - 0.4 Orchard Training Area 

0.0 - 8.08 Snake River Birds of Prey 

0.0 - 8.08 Snake River Birds of Prey NCA 

0.2 Tower 

0.4 Tower 

1.4 Outbuilding 

1.5 Residence 

2 Private Landing Strip 

4.4 Building/Industrial 

5.9 Animal Pen 

5.9 Outbuilding 

5.9 Outbuilding 

6 Barn 6 Outbuilding 

7.5 Tower 

7.7 Tower 

Alternative 8E Feasible Alternative 0.0 - 18.29 Snake River Birds of Prey 

0.0 - 18.29 Snake River Birds of Prey NCA 

0.2 Tower 0.3 Tower 

0.5 Tower 

0.6 Tower 0.7 Tower 0.8 Tower 

0.9 Tower 

1.1 Tower 1.2 Tower 1.3 Tower 

1.4 Tower 

1.6 Tower 1.7 Tower 

1.8 Tower 

1.9 Tower 

2 Tower 

2.2 Tower 

2.3 Tower 

2.4 Tower 2.5 Tower 2.7 Tower 

2.8 Tower 

Table D.17-1. Page 17 of 23

Gateway West Transmission Line Final EIS
Table D.17-1. Specific Land Uses Crossed within 1,000 Feet of Proposed Route Alternatives cont.

Route Name Route Type Closest Milepost or Milepost Span Land Use FeatuAlternative 8E (cont.) Feasible Alternative (cont.) 2.9 Tower 

3 Tower 

3.2 Tower 3.3 Tower 3.4 Tower 3.6 Tower 3.7 Tower 

3.8 Tower 3.9 Tower 4.1 Tower 4.2 Tower 4.4 Tower 4.5 Tower 4.7 Tower 

4.8 Tower 4.9 Tower 

5 Tower 

5.2 Tower 5.3 Tower 5.5 Tower 5.6 Tower 5.7 Tower 5.8 Tower 5.9 Tower 6.1 Tower 6.2 Tower 6.3 Tower 

6.3 - 7.3, 8.7 - 10.7, 11.3 - 11.9 National Register Historic District 

6.5 Tower 

6.6 Tower 6.7 Tower 6.9 Tower 6.9 Tower 

7 Tower 

7 Tower 

7.1 Tower 7.2 Tower 7.3 Tower 7.5 Tower 

9.4 - 10.7 Snake River Canyon SRMA 

10.1 - 18.29 Birds of Prey Avoidance Area 

Segment 9 Proposed - Total Length Proposed Route 0.0 - 8.3 South Hills 

2.2 Residence 

3.9 Gravel Pit 

6.4 Animal Pen 

6.5 Residence 

8.9 Dam 

12.7 Structure 

12.7 Structure 30.4 Lower Salmon Falls Creek 

32.6 Structure 

33.3 - 33.6 Salmon Falls Creek Canyon 

33.3 - 36.1 MUA-14 Salmon Falls Creek ACEC 

36.0 - 38.1 MUA-13 East Devil 38.0 - 47.2 MUA-12 West Devil 47.1 - 81.2 MUA-7 Saylor Creek East 

60.3 - 73.3 Saylor Creek HMA 

78.6 Water Tank 

81.1 - 88.3, 97.0 - 99.3 MUA-6 Saylor Creek West 

88.1 - 97.0, 142.5 - 146.3, 151.4 - 152.1, 152.2 - 152.7 Snake River Birds of Prey 

Table D.17-1. Page 18 of 23

Gateway West Transmission Line Final EIS
Table D.17-1. Specific Land Uses Crossed within 1,000 Feet of Proposed Route Alternatives cont.

Route Name Route Type Closest Milepost or Milepost Span Land Use Featu

Segment 9 Proposed - Total Length (cont.) Proposed Route (cont.) 88.1 - 97.0, 142.5 - 146.3, 151.4 - 152.1, 152.2 - 152.7 Snake River Birds of Prey NCA 

97.9 Residence 99.3 Canal 

99.4 Canal 99.4 Residence 99.6 Cemetery 

99.7 Cemetery 

101 Pivot 110 Residence 

110.5 Residence 

116.3 Gravel Pit 119.2 Animal Pen 

119.3 Residence 

119.8 Residence 

131.9 Residence 

132.6 Residence 133.3 Well 

134.9 Residence 

142.5 - 146.3 Owyhee Front SRMA 

150.2 - 151.6 Murphy Airport 

151.4 - 152.1, 152.2 - 152.7 Owyhee Front SRMA 

151.6 - 161.2 Black Mountain HMA 

161 Claypit 

161.3 Residence 

161.3 Residence 

161.4 Residence 

161.6 Outbuilding 

161.6 Outbuilding 

161.6 Outbuilding 161.6 Residence 

161.6 Residence 

161.7 Outbuilding 

161.7 Residence 

161.8 Residence 

161.8 Tower 

161.9 Outbuilding 

161.9 Residence 161.9 Tower 161.9 Tower 161.9 Tower 161.9 Tower 161.9 Tower 161.9 Tower 161.9 Tower 162.1 Outbuilding 

162.1 Tower 

162.1 Tower 

162.2 Tower 

Alternative 9A Feasible Alternative 0.0 - 2.1 South Hills 

1.6 Residence 

2.9 Residence 6.1 Gravel Pit 

Alternative 9B Feasible Alternative 0.4 Residence 

5 MUA-14 Salmon Falls Creek ACEC 

5.3 Residence 

6 Salmon Falls Creek Canyon 

6.4 Residence 7.6 CAFO 

8.2 Residence 8.4 Residence 

Table D.17-1. Page 19 of 23

Gateway West Transmission Line Final EIS
Table D.17-1. Specific Land Uses Crossed within 1,000 Feet of Proposed Route Alternatives cont.

Route Name Route Type Closest Milepost or Milepost Span Land Use FeatuAlternative 9B (cont.) Feasible Alternative (cont.) 8.9 - 23.0, 25.3 - 51.5 MUA-7 Saylor Creek East 

11.2 Pivot 11.5 Pivot 

12.1 Pivot 13.2 Pivot 16.5 Canal 

22.9 - 25.4 MUA-9 Hagerman ORV (Owsley B

27.5 Animal Pen 

37.4 - 43.6 Saylor Creek HMA 

40.2 Gravel Pit 45.2 Residence 45.8 Pivot 

46.9 - 48.0, 48.3 - 49.3 Grindstone Ag Landing Strip 

47 Warehouse 

47.5 Residence 

47.9 - 48.4 Grindstone Ag Landing Strip 

48.1 - 48.2 Airport 

48.1 - 48.2 Landing Strip 

51.4 - 52.35 MUA-6 Saylor Creek West 

Alternative 9C Feasible Alternative 0.4 Residence 

5 MUA-14 Salmon Falls Creek ACEC 

5.3 Residence 

6 Salmon Falls Creek Canyon 

6.4 Residence 7.6 CAFO 

8.2 Residence 8.3 Residence 

8.7 - 14.4 MUA-7 Saylor Creek East 

9.4 CAFO 

14.4 MUA-12 West Devil 

Alternative 9D Feasible Alternative 0.0 - 6.7, 9.4 - 15.4, 15.5 - 17.2, 18.3 - 60.1 Snake River Birds of Prey 

0.0 - 6.7, 9.4 - 15.4, 15.5 - 17.2, 18.3 - 60.1 Snake River Birds of Prey NCA 

6.9 - 9.5 MUA-6 Saylor Creek West 

8.2 - 9.9 Oregon Trail 

8.2 - 9.9 National Historic Trails 

9.4 - 15.7, 16.4 - 17.2 C.J. Strike SRMA 

9.6 - 12.5, 15.5 - 15.7, 15.9 - 16.6, 16.7 - 17.7, 17.8 - 18.2 CJ Strike WMA/Reservoir 

9.8 - 12.1 C.J. Strike Reservoir SRMA 

12.0 - 12.3 C.J. Strike Reservoir SRMA 

12.3 - 13.4 National Historic Trails 

12.3 - 13.4 Oregon Trail 

12.5 - 13.1, 15.0 - 15.4, 15.5 - 15.6 Oregon Trail SRMA 

14.1 - 15.7 National Historic Trails 

14.1 - 15.7 Oregon Trail 

15.9 - 16.5, 16.7 - 17.2 C.J. Strike Reservoir SRMA 

17.2 - 17.9 National Historic Trails 

17.2 - 17.9 Oregon Trail 

17.3 Structure 

17.6 Park 

17.8 - 18.0 National Historic Trails 

17.8 - 18.0 Oregon Trail 

18.4 C.J. Strike Reservoir SRMA 19.5 Structure 

36.1 - 40.8 Orchard Training Area 

39.8 National Guard 

46.7 - 48.7, 49.3 - 49.9 National Register Historic District 

47.3 - 48.7 Snake River Canyon SRMA 

48.1 - 58.9 Birds of Prey Avoidance Area 

57.1 - 57.8 National Historic Trails 

57.1 - 57.8 Oregon Trail 

Table D.17-1. Page 20 of 23

Gateway West Transmission Line Final EIS
Table D.17-1. Specific Land Uses Crossed within 1,000 Feet of Proposed Route Alternatives cont.

Route Name Route Type Closest Milepost or Milepost Span Land Use FeatuAlternative 9D (cont.) Feasible Alternative (cont.) 57.2 - 57.5 Oregon Trail SRMA 

58.8 - 60.1 Owyhee Front SRMA 

58.8 - 60.14 Black Mountain HMA 

Alternative 9F Feasible Alternative 0.0 - 1.4, 21.5 - 63.3 Snake River Birds of Prey 

0.0 - 1.5, 21.5 - 63.3 Snake River Birds of Prey NCA 

1.4 - 3.7 MUA-6 Saylor Creek West 

2.4 Residence 3.7 Canal 

3.8 Canal 

3.8 Residence 

4 Cemetery 

4.1 Cemetery 5.5 Pivot 

14.4 Residence 

14.9 Residence 19.5 Commercial Building 

19.5 Tower 

19.5 Tower 19.5 Tower 

19.5 Tower 19.5 Tower 19.6 Tower 

19.6 Tower 

19.7 Outbuilding 

19.7 Tower 19.7 Tower 

20.1 - 20.9, 21.0 - 21.4 CJ Strike WMA/Reservoir 

20.5 Residence 

20.5 - 21.2 National Historic Trails 20.5 - 21.2 Oregon Trail 

20.6 Outbuilding 

20.7 Residence 21.6 C.J. Strike Reservoir SRMA 22.6 Structure 

39.3 - 43.9 Orchard Training Area 

43 National Guard 

49.8 - 51.9, 52.5 - 53.1 National Register Historic District 

50.5 - 51.9 Snake River Canyon SRMA 

51.2 - 62.1 Birds of Prey Avoidance Area 

60.4 - 60.7 Oregon Trail SRMA 

61.9 - 63.3 Owyhee Front SRMA 

62.0 - 63.33 Black Mountain HMA 

60.3 - 61.0 National Historic Trails 

60.3 - 61.0 Oregon Trail 

Alternative 9G Feasible Alternative 0.0 - 6.7, 9.4 - 15.4, 15.5 - 17.2, 18.3 - 50.9, 51.2 - 57.7 Snake River Birds of Prey 

0.0 - 6.7, 9.4 - 15.4, 15.5 - 17.2, 18.3 - 50.9, 51.2 - 57.7 Snake River Birds of Prey NCA 

6.9 - 9.5 MUA-6 Saylor Creek West 

8.2 - 9.9 National Historic Trails 8.2 - 9.9 Oregon Trail 

9.4 - 15.7, 16.4 - 17.2 C.J. Strike SRMA 

9.6 - 12.5, 15.5 - 15.7, 15.9 - 16.6, 16.7 - 17.7, 17.8 - 18.2 CJ Strike WMA/Reservoir 

9.8 - 12.1 C.J. Strike Reservoir SRMA 

12.0 - 12.3 C.J. Strike Reservoir SRMA 

12.3 - 13.4 National Historic Trails 

12.3 - 13.4 Oregon Trail 

12.5 - 13.1, 15.0 - 15.4, 15.5 - 15.6 Oregon Trail SRMA 

14.1 - 15.7 National Historic Trails 

14.1 - 15.7 Oregon Trail 

15.9 - 16.5, 16.7 - 17.2 C.J. Strike Reservoir SRMA 

17.2 - 17.9 National Historic Trails 

Table D.17-1. Page 21 of 23

Gateway West Transmission Line Final EIS
Table D.17-1. Specific Land Uses Crossed within 1,000 Feet of Proposed Route Alternatives cont.

Route Name Route Type Closest Milepost or Milepost Span Land Use FeatuAlternative 9G (cont.) Feasible Alternative (cont.) 17.2 - 17.9 Oregon Trail 

17.3 Structure 

17.6 Park 

17.8 - 18.0 National Historic Trails 

17.8 - 18.0 Oregon Trail 

18.4 C.J. Strike Reservoir SRMA 19.5 Structure 

36.1 - 40.8 Orchard Training Area 

39.8 National Guard 

44.7 - 47.0, 47.2 - 48.3 National Register Historic District 

45.3 - 48.0 Snake River Canyon SRMA 

45.6 - 50.9, 51.2 - 56.6 Birds of Prey Avoidance Area 

48.6 Oregon Trail SRMA 

55.2 - 55.8 National Historic Trails 

55.2 - 55.8 Oregon Trail 

55.6 - 55.8 Oregon Trail SRMA 

56.1 Murphy Airport 

56.4 - 57.7 Owyhee Front SRMA 

56.6 - 57.77 Black Mountain HMA 

56.7 Commercial Building 

56.7 Commercial Building 

Alternative 9H Feasible Alternative 0.0 - 1.4, 21.5 - 54.1, 54.4 - 60.9 Snake River Birds of Prey 

0.0 - 1.4, 21.5 - 54.1, 54.4 - 60.9 Snake River Birds of Prey NCA 

1.4 - 3.7 MUA-6 Saylor Creek West 

2.4 Residence 3.7 Canal 

3.8 Canal 

3.8 Residence 

4 Cemetery 

4.1 Cemetery 5.5 Pivot 

14.4 Residence 

14.9 Residence 19.5 Commercial Building 

19.5 Tower 

19.5 Tower 19.5 Tower 

19.5 Tower 19.5 Tower 19.6 Tower 

19.6 Tower 

19.7 Outbuilding 

19.7 Tower 19.7 Tower 

20.5 - 21.2 National Historic Trails 20.5 - 21.2 Oregon Trail 

20.1 - 20.9, 21.0 - 21.4 CJ Strike WMA/Reservoir 

20.5 Residence 20.6 Outbuilding 

20.7 Residence 21.6 C.J. Strike Reservoir SRMA 22.6 Structure 

39.3 - 13.9 Orchard Training Area 

43 National Guard 

47.8 - 50.2, 50.4 - 51.5 National Register Historic District 

48.5 - 51.2 Snake River Canyon SRMA 

48.8 - 54.1, 54.4 - 59.8 Birds of Prey Avoidance Area 

51.7 Oregon Trail SRMA 

58.4 - 59.0 National Historic Trails 

58.4 - 59.0 Oregon Trail 

Table D.17-1. Page 22 of 23

Gateway West Transmission Line Final EIS
Table D.17-1. Specific Land Uses Crossed within 1,000 Feet of Proposed Route Alternatives cont.

Route Name Route Type Closest Milepost or Milepost Span Land Use FeatuAlternative 9H (cont.) Feasible Alternative (cont.) 58.7 - 59.0 Oregon Trail SRMA 

59.3 Murphy Airport 

59.7 - 60.9 Owyhee Front SRMA 

59.7 - 60.96 Black Mountain HMA 

59.8 Commercial Building 

59.9 Commercial Building 

Alternative 9E (revised) Feasible Alternative 0 - 2.5; 55.8 - 59.6 Snake River Birds of Prey 

0 - 2.5; 55.8 - 59.6 Snake River Birds of Prey NCA 

2.3 - 6.2 MUA-6 Saylor Creek West 

5.6 Dam 5.9 Dam 

18.6 Tower 18.7 Tower 18.9 Tower 

19 Tower 

55.8 - 59.6 Owyhee Front SRMA 

65.4 - 70.61 Black Mountain HMA 

Segment 10 Proposed - Total Length Proposed Route 0.2 Residence 

0.2 Substation 6.2 Residence 

13.6 Residence 13.7 Residence 13.9 Residence 

19.5 - 19.8 CAFO 

20 Residence 

20 Residence 

20.4 Commercial Building 

20.4 Commercial Building 20.4 Commercial Building 20.4 Commercial Building 20.4 Residence 20.5 Commercial Building 20.9 Residence 21.3 Residence 23.2 Residence 

26 Residence 

26.1 Residence 

30.9 - 31.5 National Historic Trails 

30.9 - 31.5 Oregon Trail 

31.2 Residence 32.9 Pivot 

34 Residence 

34.1 CAFO 34.1 Residence 

34.1 - 34.36 South Hills 

Note: and Proposed 10Note: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7

Table D.17-1. Page 23 of 23

Gateway West Transmission Line Final EIS
Table D.19-1. Roads, Railroads and Bridges Within 1 Mile of Project Centerline

County-Maintained 

Highways or 

Numbered/Lettered 

Routes State Highway US Highway Interstate

Number of Bridges 

in Inventory Notes

1W(a) Proposed – Total Length 73.8 20.5 19.8 2.0 2.1 44.5 7.1 11 One is posted for load

Proposed – Comparison portion for Alternative 1W(a)-B 16.5 11.0 2.6 2.0 2.1 17.7 7.1 8

Alternative 1W(a)-B 20.9 4.3 2.7 2.2 2.8 12.0 11.6 3

1W(c) Proposed – Total Length 73.6 18.0 20.8 2.0 3.5 44.4 7.8 14

Proposed – Total Length 91.9 5.8 4.4 4.5 10.8 25.5 19.6 9 One is posted for load

Proposed – Comparison portion for Alternative 2A 16.8 0.6 4.5 10.8 15.9 10.2 9 One is posted for load

Alternative 2A 16.0 1.8 5.6 7.4 15.7

Proposed – Comparison portion for Alternative 2B 12.5 0.6 2.6 10.8 14.0 7.5 9 One is posted for load

Alternative 2B 12.2 1.8 2.1 5.7 9.6 10.0 5 One is posted for load

Segment 3 Proposed – Total Length 45.9 10.1 3.6 25.1 38.8 8.2 10

Segment 3A Proposed – Total Length 5.1 5.1 2.7 7.8 3.2

Proposed – Total Length 197.6 44.7 30.5 23.3 98.5 28.1 6

Proposed – Comparison portion for Alternatives 4B-4F 85.2 14.4 12.0 6.3 32.8 13.3 2

Alternative 4B 100.2 17.3 3.5 16.8 37.5 31.1 9

Alternative 4C 101.6 14.8 2.8 31.2 48.8 47.3 10

Alternative 4D 100.8 15.9 3.5 11.0 30.4 27.0 5

Alternative 4E 102.2 13.4 2.8 25.5 41.7 43.2 6

Alternative 4F 87.5 9.6 12.8 5.9 28.3 10.3

Proposed – Total Length 55.7 4.8 6.0 10.8 2.6 3

Proposed – Comparison portion for Alternatives 5A,B 22.3 1

1/

Alternative 5A 29.7

Alternative 5B 40.4

Proposed – Comparison portion for Alternatives 5C 32.9 1

1/

Alternative 5C 26.0

Proposed – Comparison portion for Alternatives 5D 19.2 2.4 3.4 5.8 2.6 2

Alternative 5D 17.0 4.1 2.4 6.5 2.7 4

Proposed – Comparison portion for Alternatives 5E 5.8 2.4 3.4 5.8 2.6 2

Alternative 5E 5.3 2.3 3.1 5.4 3.0 2

6 Proposed – Total Length 0.5 1.5 1.5 2.7

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), Proposed 8 (including 8B), Proposed 9 (including 9E), and Proposed 10

Notes: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactly

Notes: Blank cells indicate zero miles or null value

1/ Inventoried bridges include those carrying routes smaller than county lettered/numbered routes

2/ Alternative 4G was added in late 2012 and was therefore not added to this table

Road Types (Miles)

Total Road 

Miles Railroad Miles

3

1W

2

Bridges

Segment 

Number Proposed or Alternative Name

Segment 

Length (Miles)

4

2/

5

Table D.19-1 Page 1 of 2

Gateway West Transmission Line Final EIS
Table D.19-1. Roads, Railroads and Bridges Within 1 Mile of Project Centerline cont.

County-Maintained 

Highways or 

Numbered/Lettered 

Routes State Highway US Highway Interstate

Number of Bridges 

in Inventory Notes

Proposed – Total Length 118.2 12.7 8.2 20.9 2.4 14

Proposed – Comparison portion for Alternatives 7A,B 35.1 2.1 2.1 2

Alternative 7A 37.7 2.5 2.5 1

Alternative 7B 46.2 4.1 4.1

Proposed – Comparison portion for Alternative 7C 20.1 5.5 5.5 6

Alternative 7C 20.3 2.0 2.0 2

Proposed – Comparison portion for Alternative 7D 6.2 2.4 2.0 4.5 2

Alternative 7D 6.8 3.5 2.4 5.8 2

Proposed – Comparison portion for Alternative 7E 3.8 3.4 3.4 1

Alternative 7E 4.5 2.5 2.5

Proposed – Comparison portion for Alternative 7F 10.5 3.4 3.4 2

Alternative 7F 10.8 2.4 2.4

Proposed – Comparison portion for Alternative 7G 3.3

Alternative 7G 3.4

Proposed – Comparison portion for Alternative 7K 118.2 12.7 8.2 20.9 2.4 14

Alternative 7K 148.1 7.0 5.8 12.8 6

Proposed – Total Length 131.5 10.2 7.2 4.5 21.9 7.5 4

Proposed – Comparison portion for Alternative 8A 51.9 3.6 5.2 8.8 3.1 1

Alternative 8A 53.6 6.9 4.3 5.1 16.3 6.9 10 Two are posted for load

Proposed – Comparison portion for Alternative 8B 45.3 6.6 4.5 11.1 4.4 2

Alternative 8B 45.8 7.4 5.7 13.1 14.7 12

Proposed – Comparison portion for Alternative 8C 6.5 5.7 5.7 6

Alternative 8C 6.4 2.7 2.7 4

Proposed – Comparison portion for Alternative 8D 6.9

Alternative 8D 8.1

Proposed – Comparison portion for Alternative 8E 7.0

Alternative 8E 18.3

Proposed – Total Length 162.2 1.8 23.7 2.0 27.5 2.1 3

Proposed – Comparison portion for Alternative 9A 7.8 0.2 0.2

Alternative 9A 7.7 0.2 0.2

Proposed – Comparison portion for Alternative 9B 49.1 1

1/

Alternative 9B 52.3 1

1/

Proposed – Comparison portion for Alternative 9C 14.4 1

1/

Alternative 9C 14.4 1

1/

Proposed – Comparison portion for Alternatives 9D,F,G,H 57.2 22.6 22.6 1

Alternative 9D 60.1 12.3 12.3 2

Alternative 9F 63.3 12.3 12.3 2

Alternative 9G 57.8 12.5 12.5 3

Alternative 9H 61.0 12.4 12.4 3

Proposed – Comparison portion for Alternative 9E (revised) 61.4 22.6 22.6 1

Alternative 9E (revised) 70.6 11.8 11.8 2

10 Proposed – Total Length 34.4 7.4 4.1 2.0 13.6 7.0 6

990.4 105.9 140.6 46.7 62.3 355.5 98.5 80.0

Notes: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D, and 7G), Proposed 8 (including 8B), Proposed 9 (including 9E), and Proposed 10

Notes: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactly

Notes: Blank cells indicate zero miles or null value

1/ Inventoried bridges include those carrying routes smaller than county lettered/numbered routes

Total All Proposed Total Length Routes (grey shaded rows)

Bridges

Proposed or Alternative Name

Segment 

Length (Miles)

Road Types (Miles)

Total Road 

Miles

9

7

8

Railroad Miles

Segment 

Number

Table D.19-1 Page 2 of 2

Gateway West Transmission Line Final EIS
Table D.19-2. Airports and Heliports Within 1 Mile and 3 Miles of the Proposed Route

Facility Type Facility Name Facility Use 

Airport Ellis Ranch Private Airport 

Landing Strip Unknown Private Landing 

Proposed – Comparison portion for Alternative 1W(a)-B 16.5 

Alternative 1W(a)-B 20.9 

Airport 

Landing Strip Unknown Private Landing 

Airport 

Heliport 

Proposed – Comparison portion for Alternative 2A 16.8 

Alternative 2A 16.0 

Proposed – Comparison portion for Alternative 2B 12.5 

Alternative 2B 12.2 

Segment 3 Proposed – Total Length 45.9 

Segment 3A Proposed – Total Length 5.1 

Airport 

Airport Airport Heliport Airport Airport 

Alternative 4B 100.2 

Alternative 4C 101.6 Airport 

Alternative 4D 100.8 

Alternative 4E 102.2 Airport 

Alternative 4F 87.5 Airport 

Proposed – Total Length 55.7 Airport 

Proposed – Comparison portion for Alternatives 5A,B 22.3 

Alternative 5A 29.7 

Alternative 5B 40.4 

Proposed – Comparison portion for Alternative 5C 32.9 

Alternative 5C 26.0 

Proposed – Comparison portion for Alternative 5D 19.2 

Alternative 5D 17.0 

Proposed – Comparison portion for Alternative 5E 5.8 

Alternative 5E 5.3 

6 Proposed – Total Length 0.5 

73.685.2

32

Note: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D

1/ Alternative 4G was added in late 2012 and was therefore not added to this table

Proposed – Total Length 91.9Proposed – Total Length 197.61W(a) Proposed – Total Length 73.8

Within 1 Mile of Route 

Segment 

Number Proposed or Alternative Name

Segment 

Length (Miles)

1W

1W(c) Proposed – Total Length

41/

5

Proposed – Comparison portion for Alternatives 4B-4F

Table D.19-2 Page 1 of 3

Gateway West Transmission Line Final EIS
Table D.19-2. Airports and Heliports Within 1 Mile and 3 Miles of the Proposed Route cont.

Facility Type Facility Name Facility Use 

Airport Landing 

Landing Strip Unknown Private Landing 

Landing Strip Unknown (Proposed) Private Landing 

Proposed – Comparison portion for Alternatives 7A,B 35.1 

Alternative 7A 37.7 

Alternative 7B 46.2 

Proposed – Comparison portion for Alternative 7C 20.1 

Alternative 7C 20.3 

Proposed – Comparison portion for Alternative 7D 6.2 

Alternative 7D 6.8 

Proposed – Comparison portion for Alternative 7E 3.8 Landing 

Alternative 7E 4.5 Landing 

Proposed – Comparison portion for Alternative 7F 10.5 Landing Strip Unknown Private Landing 

Alternative 7F 10.8 Landing Strip Unknown Private Landing 

Landing 

Landing Strip Unknown (Proposed) Private Landing 

Landing 

Landing Strip Unknown (Proposed) Private Landing 

Airport 

Landing 

Landing Strip Unknown Private Landing 

Landing Strip Unknown (Proposed) Private Landing 

Airport Landing Airport Airport Landing 

Landing Strip Unknown Private Landing 

Ultraligh

Proposed – Comparison portion for Alternative 8A 51.9 Airport 

Airport Heliport Airport Landing 

Landing Strip Unknown Private Landing 

UltralighAirport Airport Airport Landing UltralighAirport UltralighAirport Ultraligh

Proposed – Comparison portion for Alternative 8D 6.9 Landing 

Alternative 8D 8.1 Landing Strip Unknown Private Landing 

Proposed – Comparison portion for Alternative 8E 7.0 Landing 

Alternative 8E 18.3 Landing 

53.6

118.2

3.4

Segment 

Length (Miles)

Alternative 8C

6.56.4

Note: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D

8

Alternative 8B 45.8Proposed – Comparison portion for Alternative 8B 45.3Proposed – Comparison portion for Alternative 8C

148.1131.5

Proposed – Total Length 118.2Proposed – Comparison portion for Alternative 7GAlternative 7G

3.3

Within 1 Mile of Route 

Segment 

Number Proposed or Alternative Name

Alternative 8AAlternative 7KProposed – Comparison portion for Alternative 7K

7

Proposed – Total Length

Table D.19-2 Page 2 of 3

Gateway West Transmission Line Final EIS
Table D.19-2. Airports and Heliports Within 1 Mile and 3 Miles of the Proposed Route cont.

Facility Type Facility Name Facility Use 

Airport 

Airport Murphy Public Airport 

Landing Landing 

Landing Strip Unknown Private Landing 

Landing Strip Unknown Private Landing 

Proposed – Comparison portion for Alternative 9A 7.8 

Alternative 9A 7.7 

Proposed – Comparison portion for Alternative 9B 49.1 Landing 

Alternative 9B 52.3 Landing Strip Unknown Private Landing 

Proposed – Comparison portion for Alternative 9C 14.4 

Alternative 9C 14.4 

Airport 

Airport Murphy Public Airport 

Landing 

Landing Strip Unknown Private Landing 

Landing Strip Unknown Private Landing 

Airport Landing Landing Airport Landing 

Landing Strip Unknown Private Landing 

Airport Murphy Public Airport 

Landing Landing Landing 

Airport Murphy Public Airport 

Landing 

Landing Strip Unknown Private Landing 

Landing Airport 

Airport Murphy Public Airport 

Landing 

Landing Strip Unknown Landing 

Landing Strip Unknown Private Landing 

Landing Strip Unknown Private Airport 

Airport Landing Landing 

10 Proposed – Total Length 34.4

Note: The BLM’s Preferred Route includes Proposed 1W, Proposed 2, Proposed 3, Proposed 4 (including 4G), Proposed 5 (including 5B and 5E), Proposed 6, Proposed 7 (including 7B, 7C, 7D

9

61.470.6

Proposed – Comparison portion for Alternative 9E (revised)Alternative 9E (revised)

Within 1 Mile of Route 

57.260.163.3

Segment 

Length (Miles)

Alternative 9GAlternative 9H

57.861.0

Alternative 9DAlternative 9FProposed – Total Length 162.2Proposed – Comparison portion for Alternatives 9D,F,G,H

Segment 

Number Proposed or Alternative Name

Table D.19-2 Page 3 of 3

Gateway West Transmission Line Final EIS