Gateway West Transmission Line Draft EIS 

Appendix D 

Large Format Data Tables 

These tables compare the Proposed and Alternative Routes across many resources, 

regardless of the need for plan amendments or the likelihood that they would be approved. 

In two cases, the BLM has indicated that an amendment is infeasible and that the portion of 

the route in the area of the infeasible plan amendment could therefore not be approved. For 

the Draft EIS, this applies to Alternatives 9D and 9G where they pass through the Cove nonmotorized area in the C.J. Strike SRMA, and to Proposed Route 9 where it crosses the 

eligible WSR portion of Salmon Falls Creek. 
Gateway West Transmission Line Draft EIS 

Appendix D – Large Format Data Tables D-iii

Table of Contents 

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. Impacts (acres) to Vegetation from Two Single‐Circuit Construction

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.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.9‐3. Impacts to Wetlands and Riparian Areas during Two Single‐Circuit Construction (acres)

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

Table D.10‐2. Known Active Nests of Raptors and Birds of Prey 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 Operation Impacts to Big Game Habitat Impacted by the Gateway West

Transmission Line

Table D.10‐9. Acres of Operational Impacts that Would Occur within a 1‐mile Buffer around Raptors

and Birds of Prey Nests

Table D.10‐10. Acres of Construction Impacts to Big Game Habitat Impacted by the Design Alternative

Table D.11‐1. 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 Crossed for Federal ESA Wildlife Species with Available Quantitative

Data
Gateway West Transmission Line Draft EIS 

Appendix D – Large Format Data Tables D-iv

Table D.11‐4. Miles of Habitat Crossed for BLM and Forest Service Sensitive Species with Available

Quantitative Data

Table D.11‐5. Acres of Construction Impacts for Federal ESA Wildlife Species with Available

Quantitative Data

Table D.11‐6. Acres of Construction Impacts to BLM and Forest Service Sensitive Species with

Available Quantitative Data

Table D.11‐7. Acres of Habitat Occupancy during Operations for Federal ESA Wildlife Species with

Available Quantitative Data

Table D.11‐8. Acres of Operation Impacts to BLM and Forest Service Sensitive Species with Available

Quantitative Data

Table D.11‐9. Number of Greater Sage‐Grouse Leks within Specified Distances from Route Centerlines

Table D.11‐10. Number of Columbian Sharp‐Tailed Grouse Leks within Specified Distances from Route

Centerlines

Table D.11‐11. Miles of Agency Designated Greater Sage‐Grouse Habitat Crossed by the Route

Centerlines

Table D.11‐12. Acres of Two Single‐Circuit Construction Impacts to ESA Wildlife Species with Available

Quantitative Data, due to Construction of the Design Alternative  

Table D.11‐13. Acres of Two Single‐Circuit Construction Impacts to BLM and Forest Service Sensitive

Species with Available Quantitative Data, due to Construction of the Design Alternative

Table D.11‐14. Acres of Construction Impacts to Agency Designated Greater Sage‐Grouse Habitat

Table D.13‐1. Paleontological Sensitivity Rankings for Proposed and Alternative Routes

Table D.14‐1. OPS Earthquake Hazard for Proposed and Alternative Routes

Table D.14‐2. Affected Miles by Earthquake Magnitude Buffers

Table D.14‐3. Miles of Landslide Hazard Ranking Crossed by Alternative  

Table D.14‐4. Acres of Construction Disturbance within Subsidence Areas

Table D.14‐5. Acres of Operations Disturbance within Subsidence Areas

Table D.14‐6. Miles of Each Depth to Shallow Bedrock Category Crossed by Proposed and Alternative

Routes

Table D.14‐7. Miles of Shallow Bedrock in Landslide, Subsidence, or Coal (Methane) Zones

Table D.15‐1. Analysis of Soil Factors in Construction Disturbance Areas (in acres)

Table D.15‐2. Analysis of Soil Factors in Operations Disturbance Areas (in acres)

Table D.15‐3. Soil Impacts on National Forest‐Construction Areas (in acres)

Table D.15‐4. Soil Impacts on National Forest‐Operations Areas (in acres)

Table D.15‐5. Analysis of Soil Factors in Construction of Two Single‐Circuit Alternative Areas (in acres)

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. Flood Hazard Risk (in Acres per Risk Rank) in Two Single‐Circuit Alternatives

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
Gateway West Transmission Line Draft EIS 

Appendix D – Large Format Data Tables D-v

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. Potential Two Single‐Circuit Alternatives Construction Disturbance (in Acres per Depth

Range) in Areas Containing Shallow Groundwater

Table D.16‐10. Potable Water Wells within One‐Half Mile of Transmission Lines

Table D.16‐11. Miles of the Eastern Snake River Plain Aquifer crossed by Proposed and Alternative

Routes

Table D.16‐12. Estimated Transmission Line Construction Water Requirements per Segment

Table D.16‐13. TMDL and 303(d) listed Streams in the Analysis Area (Named Streams)

Table D.16‐14. Acreage Comparison of Construction Related Stream Impacts

Table D.16‐15. Acreage Comparison of Operations Disturbance to Stream Buffers

Table D.16‐16. Acreage Comparison of Two Single‐Circuit Construction Disturbance to Stream Buffers

Table D.17‐1. Specific Land Uses Crossed or Within 1,000 Feet of the Proposed Action and Alternatives

Table D.19‐1. Roads, Railroads and Bridges Within One Mile of Project Centerline

Gateway West Transmission Line Draft EIS

Sagebrush

Saltbush

Greasewood

Dwarf Shrub

Other Shrub

Native Grass

Juniper

Deciduous 

Forest

Conifer Forest

Wetland & 

Riparian

Misc.

Disturbed 

Sagebrush

Proposed – Total Length 100.6 46.7 t1/ 1.5 23.2 0.5 0.1 10.2 2.5 4.0 2.0 0.8 2.6 

Proposed – Comparison portion for Alternative 1E-A 17.6 10.1 t1/ 0.3 1.2 

Alternative 1E-A 16.1 4.5 t1/ 0.4 t1/ 2.1 

Proposed – Comparison portion for Alternative 1E-B 37.9 17.3 t1/ 0.7 17.1 0.1 0.1 0.5 0.7 0.2 0.8 

Alternative 1E-B 59.3 19.7 3.5 21.6 6.2 0.2 4.1 0.8 0.1 0.4 Proposed – Comparison portion for Alternative 1E-C 75.4 31.4 t1/ 1.5 23.2 0.1 10.1 1.4 3.8 1.7 0.8 1.0 

Alternative 1E-C 48.7 41.7 1.6 1.1 0.6 0.5 0.5 0.4 1.8 

1W(a) Proposed – Total Length 76.5 56.6 1.5 t1/ 5.0 1.5 2.4 0.3 1.1 t1/ 4.7 Proposed – Comparison portion for Alternative 1W-A 20.3 10.5 5.0 0.1 0.2 1.4 

Alternative 1W-A 16.2 4.2 t1/ 0.5 0.9 

1W(c) Proposed – Total Length 70.6 49.7 1.3 0.1 0.5 1.6 3.3 1.7 0.4 5.4 

Proposed – Total Length 96.7 44.4 6.9 16.2 15.0 0.2 0.9 0.6 8.2 Proposed – Comparison portion for Alternative 2A 28.8 12.2 1.0 9.4 0.4 0.6 4.8 Alternative 2A 28.4 16.3 1.9 4.9 0.9 0.6 3.6 

Proposed – Comparison portion for Alternative 2B 7.0 4.6 0.5 0.6 0.4 t1/ 0.6 

Alternative 2B 6.2 2.7 0.6 2.3 0.3 0.2 Proposed – Comparison portion for Alternative 2C 28.4 10.2 0.4 8.5 0.8 0.2 0.4 5.5 

Alternative 2C 24.4 15.3 1.8 2.2 0.2 0.3 4.4 

3 Proposed – Total Length 56.5 16.3 5.2 15.5 11.7 0.9 5.4 

Proposed – Total Length 203.0 112.0 0.1 8.8 10.2 0.9 t1/ 3.5 13.6 7.1 6.4 1.5 15.5 

Proposed – Comparison portion for Alternatives 4A-4F 90.2 50.6 3.3 6.1 1.0 4.1 4.7 2.3 0.3 12.7 Alternative 4A 85.2 65.6 0.4 6.9 0.3 t1/ 1.2 2.9 0.5 3.2 

Alternative 4B 100.2 78.5 t1/ 0.6 8.1 t1/ t1/ 1.8 0.3 3.8 Alternative 4C 101.6 76.3 t1/ 0.9 7.9 t1/ 1.3 0.3 6.0 Alternative 4D 100.8 78.8 t1/ 0.6 8.4 0.1 t1/ 1.8 0.3 3.8 Alternative 4E 102.2 76.6 t1/ 0.9 8.2 0.1 t1/ 1.3 0.3 6.0 Alternative 4F 87.5 68.1 0.4 6.6 0.1 t1/ 1.2 1.1 2.6 0.5 3.1 Proposed – Total Length 54.6 22.6 t1/ 5.4 4.2 3.7 0.4 t1/ 2.1 

Proposed – Comparison portion for Alternatives 5A,B 25.3 10.6 t1/ 3.1 2.4 3.7 0.1 t1/ 

Alternative 5A 33.7 13.9 0.2 3.6 2.9 2.1 t1/ Alternative 5B 44.4 18.0 0.6 4.0 1.8 1.1 t1/ 3.7 

Proposed – Comparison portion for Alternative 5C 33.2 14.6 t1/ 2.4 4.1 3.7 0.2 t1/ 1.9 Alternative 5C 26.1 5.8 0.6 2.5 1.8 t1/ 0.2 9.1 

Proposed – Comparison portion for Alternative 5D 19.4 8.2 1.9 1.8 0.2 2.1 Alternative 5D 17.5 2.0 3.7 t1/ 0.5 4.8 

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

Alternative 5E 5.3 0.7 t1/ 0.1 

6 Proposed – Total Length 0.5 0.2 

Note: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactly

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

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

Distu

1E

1W

245

Table D.6-1 Page 1 of 2
Gateway West Transmission Line Draft EIS

Sagebrush

Saltbush

Greasewood

Dwarf Shrub

Other Shrub

Native Grass

Juniper

Deciduous Forest

Conifer Forest

Wetland & 

Riparian

Misc.

Disturbed 

Sagebrush

Proposed – Total Length 118.1 32.8 1.7 0.5 0.1 7.6 2.2 2.4 0.3 9.4 

Proposed – Comparison portion for Alternatives 7A,B 35.2 10.8 0.5 2.1 2.2 2.4 0.1 1.1 

Alternative 7A 38.0 16.8 1.1 2.8 3.1 0.6 3.8 Alternative 7B 46.4 22.9 0.5 1.0 1.1 1.5 t1/ 5.4 

Proposed – Comparison portion for Alternative 7C 20.1 4.0 1.7 4.6 

Alternative 7C 20.3 0.8 7.8 Proposed – Comparison portion for Alternative 7D 6.2 1.4 0.1 0.3 t1/ 1.0 

Alternative 7D 6.8 1.7 0.3 t1/ 1.3 Proposed – Comparison portion for Alternative 7E 3.8 2.0 0.5 

Alternative 7E 4.5 2.3 0.7 0.5 Proposed – Comparison portion for Alternative 7F 10.5 3.6 2.8 Alternative 7F 10.8 2.4 2.9 1.5 Proposed – Comparison portion for Alternative 7G 3.1 2.0 0.6 

Alternative 7G 3.2 0.8 1.5 Proposed – Comparison portion for Alternatives 7H,I 118.1 32.8 1.7 0.5 0.1 7.6 2.2 2.4 0.3 9.4 

Alternative 7H 127.5 51.0 5.3 t1/ 4.9 9.6 4.4 5.3 1.1 t1/ 22.7 Alternative 7I 173.4 70.9 0.7 6.1 4.4 9.5 6.9 4.7 1.5 t1/ 34.4 

Proposed – Comparison portion 7/9 for Alternative 7J 2/ 143.9 36.9 1.7 0.5 0.1 7.6 2.2 2.4 0.4 18.8 

Alternative 7J2/ 202.1 78.2 0.7 6.1 3.8 9.5 4.7 4.6 1.3 t1/ 56.2 

Proposed – Total Length 131.0 37.5 2.8 0.8 0.4 0.7 0.3 28.8 Proposed – Comparison portion for Alternative 8A 51.4 21.3 0.1 5.1 Alternative 8A 53.6 3.2 0.1 0.3 19.8 Proposed – Comparison portion for Alternative 8B 45.3 5.4 2.8 0.8 0.2 0.2 16.6 

Alternative 8B 45.8 7.1 0.5 0.3 9.2 Proposed – Comparison portion for Alternative 8C 6.5 0.8 t1/ 2.7 

Alternative 8C 6.4 2.2 t1/ 0.2 Proposed – Comparison portion for Alternative 8D 6.9 0.6 

Alternative 8D 8.1 0.5 Proposed – Compare to Alternative 8E 7.0 0.5 0.1 3.7 

Alternative 8E 18.5 1.7 9.6 Proposed – Total Length 161.7 33.3 19.5 3.5 t1/ 3.2 t1/ 0.5 0.5 27.8 

Proposed – Comparison portion for Alternative 9A 7.8 1.5 t1/ 2.1 

Alternative 9A 7.7 1.4 t1/ 4.0 Proposed – Comparison portion for Alternative 9B 49.5 10.6 t1/ 1.7 t1/ t1/ 0.1 10.5 

Alternative 9B 53.2 2.8 3.4 1.1 t1/ 10.6 

Proposed – Comparison portion for Alternative 9C 14.7 6.0 1.7 t1/ t1/ 0.1 1.0 

Alternative 9C 15.3 1.1 t1/ 5.6 

Proposed – Comparison portion for Alternatives 9D-9H 57.2 12.7 17.7 3.3 t1/ 0.4 0.4 3.7 

Alternative 9D 58.4 8.5 1.1 t1/ 0.1 17.5 Alternative 9E 68.7 31.9 2.3 0.9 0.2 0.4 21.1 Alternative 9F 62.9 10.8 3.5 1.0 0.4 14.4 Alternative 9G 56.4 6.7 2.2 t1/ t1/ 0.1 19.7 Alternative 9H 61.0 9.1 4.6 1.0 0.4 16.5 

10 Proposed – Total Length 33.6 2.5 t1/ t1/ 5.9 

454.6 34.6 50.8 60.1 2.2 9.0 28.9 26.5 20.7 14.8 4.2 115.8 

Note: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactly

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

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

Segment 

Number Proposed or Alternative Name

Segment 

Length 

(Miles)

Natural Vegetation

89

Total of All Proposed Segments (grey shaded areas)

2/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for Se

7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 7 of the Proposed Route (118.1 miles) 

Distu

7

Table D.6-1 Page 2 of 2
Gateway West Transmission Line Draft EIS

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

Construction 

Facilities

ROW Clearing1/

Total Impacts

Proposed – Total Length 100.6 514 2 22 286 3 <1 3 35 46 8Proposed – Comparison portion for Alternative 1E-A 17.6 116 <1 t2/ <1 

Alternative 1E-A 16.1 38 t2/ 1 t2/ 

Proposed – Comparison portion for Alternative 1E-B 37.9 183 1 5 177 <1 3 6 9 Alternative 1E-B 59.3 245 36 296 44 1 <1 Proposed – Comparison portion for Alternative 1E-C 75.4 365 1 22 286 <1 3 32 44 7Alternative 1E-C 48.7 256 17 3 2 6 8 1W(a) Proposed – Total Length 76.5 419 22 <1 47 <1 3 3 5 Proposed – Comparison portion for Alternative 1W-A 20.3 105 47 Alternative 1W-A 16.2 39 1 1W(c) Proposed – Total Length 70.6 555 26 <1 2 19 38 5Proposed – Total Length 96.7 782 104 233 214 5 Proposed – Comparison portion for Alternative 2A 28.8 174 15 126 12 Alternative 2A 28.4 246 27 76 15 Proposed – Comparison portion for Alternative 2B 7.0 54 9 20 12 Alternative 2B 6.2 35 6 29 Proposed – Comparison portion for Alternative 2C 28.4 138 6 96 13 2 Alternative 2C 24.4 213 17 23 2 

3 Proposed – Total Length 56.5 308 64 194 156 

Proposed – Total Length 203.0 1657 <1 148 147 15 <1 16 76 191 26Proposed – Comparison portion for Alternatives 4A-4F 90.2 754 43 91 4 48 129 17Alternative 4A 85.2 941 20 13 78 4 6 Alternative 4B 100.2 1088 20 15 138 4 Alternative 4C 101.6 1046 20 21 139 4 Alternative 4D 100.8 1094 20 21 144 4 <1 <Alternative 4E 102.2 1056 20 23 145 4 <1 <Alternative 4F 87.5 978 20 15 66 1 6 15 29 4Proposed – Total Length 54.6 399 3 <1 65 88 15Proposed – Comparison portion for Alternatives 5A,B 25.3 161 3 <1 65 88 15Alternative 5A 33.7 224 1 30 45 7

Alternative 5B 44.4 290 11 14 23 3Proposed – Comparison portion for Alternative 5C 33.2 226 3 <1 65 88 15Alternative 5C 26.1 85 10 2 3 5 Proposed – Comparison portion for Alternative 5D 19.4 162 t2/ 3 3 

Alternative 5D 17.5 68 <1 t2/ 2 <1 2 

Proposed – Comparison portion for Alternative 5E 5.8 52 Alternative 5E 5.3 37 

6 Proposed – Total Length 0.5 16

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

2/ "t" indicates only a trace amount (<0.1 acre) of impact1/ ROW Clearing limited to tall vegetation that may impact transmission line safety

245

1E

1W

Dwarf Shrub

Other Shrub

Native Grass

Misc.

Conifer Forest 

Segment 

Number Proposed or Alternative Name

Segment 

Length 

(Miles)

Sagebrush

Saltbush

Greasewood

Table D.6-2 Page 1 of 4
Gateway West Transmission Line Draft EIS

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

Construction 

Facilities

ROW Clearing1/

Total Impacts

Proposed – Total Length 118.1 441 15 5 1 36 59 9Proposed – Comparison portion for Alternatives 7A,B 35.2 158 5 36 59 9Alternative 7A 38.0 240 t2/ 45 66 11

Alternative 7B 46.4 334 10 17 36 5Proposed – Comparison portion for Alternative 7C 20.1 53 15 

Alternative 7C 20.3 7Proposed – Comparison portion for Alternative 7D 6.2 12 1 Alternative 7D 6.8 14 <1 Proposed – Comparison portion for Alternative 7E 3.8 33 Alternative 7E 4.5 31 Proposed – Comparison portion for Alternative 7F 10.5 53 Alternative 7F 10.8 37 Proposed – Comparison portion for Alternative 7G 3.1 23 Alternative 7G 3.2 14 Proposed – Comparison portion for Alternatives 7H,I 118.1 441 15 5 1 36 59 9Alternative 7H 127.5 846 80 <1 55 <1 74 127 20Alternative 7I 173.4 989 6 54 60 t2/ 71 116 18

Proposed – Comparison portion 7/9 for Alternative 7J 3/ 143.9 504 15 5 1 36 59 9

Alternative 7J3/ 202.1 1094 6 54 48 t2/ 73 114 18

Proposed – Total Length 131.0 669 53 18 3 2 Proposed – Comparison portion for Alternative 8A 51.4 333 Alternative 8A 53.6 78 2 Proposed – Comparison portion for Alternative 8B 45.3 88 53 18 2 Alternative 8B 45.8 120 6 <1 Proposed – Comparison portion for Alternative 8C 6.5 27 Alternative 8C 6.4 33 t2/ <1 

Proposed – Comparison portion for Alternative 8D 6.9Alternative 8D 8.1Proposed – Comparison portion for Alternative 8E 7.0 11Alternative 8E 18.5 42 Proposed – Total Length 161.7 500 273 57 <1 53 2 

Proposed – Comparison portion for Alternative 9A 7.8 14 Alternative 9A 7.7 21 Proposed – Comparison portion for Alternative 9B 49.5 154 <1 41 Alternative 9B 53.2 60 47 19 Proposed – Comparison portion for Alternative 9C 14.7 83 41 Alternative 9C 15.3 25Proposed – Comparison portion for Alternatives 9D-9H 57.2 198 244 54 <1 2 Alternative 9D 58.4 139 14 Alternative 9E 68.7 494 28 12 3 Alternative 9F 62.9 173 43 15 Alternative 9G 56.4 92 43 t2/ 

Alternative 9H 61.0 126 72 15 

10 Proposed – Total Length 33.6 24 

6285 497 734 804 27 106 31 234 425 66

2/ "t" indicates only a trace amount (<0.1 acre) of impact1/ ROW Clearing limited to tall vegetation that may impact transmission line safety

3/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for Seg

7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 7 of the Proposed Route (118.1 miles) on

9

Total of All Proposed Segments (grey shaded areas)Note: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

78

Dwarf Shrub

Other Shrub

Native Grass

Misc.

Conifer Forest 

Segment 

Number Proposed or Alternative Name

Segment 

Length 

(Miles)

Sagebrush

Saltbush

Greasewood

Table D.6-2 Page 2 of 4
Gateway West Transmission Line Draft EIS

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

Construction 

Facilities

ROW Clearing1/

Proposed - Total Length 100.6 19 71 32 1 <1 10 963 197 Proposed - Comparison portion for Alternative 1E-A 17.6 10 70 12 <1 5 116 1 Alternative 1E-A 16.1 15 51 4 13 t2/ 41 3 

Proposed - Comparison portion for Alternative 1E-B 37.9 5 t2/ 9 <1 4 375 10 

Alternative 1E-B 59.3 12 40 12 <1 <1 <1 663 48 Proposed - Comparison portion for Alternative 1E-C 75.4 6 <1 20 1 5 799 179 Alternative 1E-C 48.7 11 t2/ 6 t2/ 1 292 25 1W(a) Proposed - Total Length 76.5 38 42 20 t2/ <1 <1 522 49 

Proposed - Comparison portion for Alternative 1W-A 20.3 11 35 11 t2/ t2/ <1 153 2 

Alternative 1W-A 16.2 7 72 6 9 t2/ t2/ 42 4 1W(c) Proposed - Total Length 70.6 60 100 15 1 3 5 632 65 Proposed - Total Length 96.7 105 34 42 12 2 1349 6 Proposed - Comparison portion for Alternative 2A 28.8 62 t2/ 6 t2/ <1 329 <1 Alternative 2A 28.4 62 14 <1 t2/ 370 5 

Proposed - Comparison portion for Alternative 2B 7.0 7 t2/ 3 t2/ t2/ 94 

Alternative 2B 6.2 4 1 2 t2/ 72 3 

Proposed - Comparison portion for Alternative 2C 28.4 74 33 5 t2/ <1 257 <1 

Alternative 2C 24.4 54 <1 6 6 255 

3 Proposed - Total Length 56.5 90 <1 30 3 5 735 

Proposed - Total Length 203.0 179 86 57 197 4 7 2317 675 Proposed - Comparison portion for Alternatives 4A-4F 90.2 147 46 16 6 <1 3 1016 265 Alternative 4A 85.2 45 26 19 24 6 <1 1129 40 Alternative 4B 100.2 61 17 28 62 6 1 1309 4 Alternative 4C 101.6 85 15 29 76 4 1 1267 3 Alternative 4D 100.8 68 17 27 63 5 1 1324 6 Alternative 4E 102.2 85 15 28 77 4 1 1285 6 Alternative 4F 87.5 34 26 19 20 3 <1 1158 67 Proposed - Total Length 54.6 48 47 37 234 2 2 613 299 Proposed - Comparison portion for Alternatives 5A,B 25.3 2 6 2 106 t2/ 323 207 

Alternative 5A 33.7 15 59 10 124 <1 345 198 Alternative 5B 44.4 60 27 7 200 <1 388 159 Proposed - Comparison portion for Alternative 5C 33.2 45 15 11 123 <1 396 233 Alternative 5C 26.1 198 10 4 68 t2/ <1 152 105 Proposed – Comparison portion for Alternative 5D 19.4 46 14 30 93 2 2 224 85 Alternative 5D 17.5 69 8 16 125 2 2 144 89 Proposed – Comparison portion for Alternative 5E 5.8 5 9 21 44 2 1 55 3 Alternative 5E 5.3 4 9 23 27 2 2 37 

6 Proposed - Total Length 0.5 26 12 2 8 16 

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

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

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

245

1E

1W

Disturbed 

Grassland

Disturbed/

Developed

Agriculture

Water

No Vegetation DataTotal Natural Vege

Segment Number Proposed or Alternative Name Segment Length (Miles)

Disturbed 

Sagebrush

Table D.6-2 Page 3 of 4
Gateway West Transmission Line Draft EIS

Construction 

Facilities

ROW Clearing1/

Proposed - Total Length 118.1 158 209 25 799 t2/ 2 610 279 

Proposed – Comparison portion for Alternative 7A,B 35.2 12 51 5 184 <1 246 158 Alternative 7A 38.0 55 60 13 138 <1 352 159 Alternative 7B 46.4 67 28 10 246 <1 395 81 Proposed – Comparison portion for Alternative 7C 20.1 83 16 1 119 t2/ 68 

Alternative 7C 20.3 109 100 3 71 <1 t2/ 7 

Proposed – Comparison portion for Alternative 7D 6.2 26 23 2 43 t2/ t2/ 19 6 

Alternative 7D 6.8 24 35 2 44 t2/ t2/ 20 5 Proposed – Comparison portion for Alternative 7E 3.8 15 <1 14 t2/ 37 10 

Alternative 7E 4.5 10 16 <1 13 t2/ 38 17 Proposed – Comparison portion for Alternative 7F 10.5 1 38 3 67 <1 92 59 Alternative 7F 10.8 16 42 2 29 t2/ 80 64 

Proposed – Comparison portion for Alternative 7G 3.1 17 1 7 23 Alternative 7G 3.2 30 6 21 15 Proposed – Comparison portion for Alternative 7H,I 118.1 158 209 25 798 t2/ 2 610 279 

Alternative 7H 127.5 392 139 42 277 <1 3 1263 433 Alternative 7I 173.4 504 374 22 283 <1 4 1548 483 Proposed – Comparison portion 7/9 for Alternative 7J 3/ 143.9 263 356 47 886 <1 4 674 279 

Alternative 7J3/ 202.1 853 406 25 283 <1 18 1594 427 

Proposed - Total Length 131.0 435 677 33 228 1 <1 751 <1 Proposed – Comparison portion for Alternative 8A 51.4 106 167 9 196 1 <1 335 <1 Alternative 8A 53.6 299 164 13 267 <1 <1 81 5 Proposed – Comparison portion for Alternative 8B 45.3 229 318 16 29 <1 t2/ 162 

Alternative 8B 45.8 174 190 41 239 1 <1 134 <1 Proposed – Comparison portion for Alternative 8C 6.5 43 66 3 t2/ 27 

Alternative 8C 6.4 10 55 16 23 t2/ t2/ 34 

Proposed – Comparison portion for Alternative 8D 6.9 7 111 5 t2/ t2/ 

Alternative 8D 8.1 7 119 5 12 t2/ t2/ Proposed – Comparison portion for Alternative 8E 7.0 34 42 2 9 t2/ 11 

Alternative 8E 18.5 157 81 3 <1 <1 42 Proposed - Total Length 161.7 371 982 61 363 2 2 889 <1 Proposed – Comparison portion for Alternative 9A 7.8 34 52 17 <1 t2/ 15 

Alternative 9A 7.7 63 33 13 3 <1 t2/ 21 Proposed – Comparison portion for Alternative 9B 49.5 151 414 19 45 t2/ <1 196 <1 

Alternative 9B 53.2 126 336 6 217 4 <1 127 <1 Proposed – Comparison portion for Alternative 9C 14.7 10 91 12 t2/ 125 <1 Alternative 9C 15.3 64 111 10 62 t2/ 7 25 

Proposed – Comparison portion for Alternatives 9D-9H 57.2 47 184 16 206 1 <1 501 Alternative 9D 58.4 248 369 19 19 <1 3 157 <1 Alternative 9E 68.7 238 218 5 3 t2/ 2 539 Alternative 9F 62.9 230 363 23 115 3 <1 236 Alternative 9G 56.4 291 368 19 26 2 2 140 <1 Alternative 9H 61.0 274 342 24 118 3 <1 218 

10 Proposed - Total Length 33.6 72 157 24 267 3 <1 24 

1577 2431 388 2090 32 45 9421 1570 

2/ "t" indicates only a trace amount (<0.1 acre) of impact1/ ROW Clearing limited to tall vegetation that may impact transmission line safety

3/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for Seg

portion of Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 7 of the Proposed Ro

9

Total of All Proposed Segments (grey shaded areas)Note: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

78

Disturbed 

Grassland

Disturbed/

Developed

Agriculture

Water

No Vegetation DataTotal Natural Vege

Segment Number Proposed or Alternative Name Segment Length (Miles)

Disturbed 

Sagebrush

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

Table D.6-2 Page 4 of 4
Gateway West Transmission Line Draft EIS

Operations 

Facilities

ROW 

Maintenance1/

Proposed – Total Length 100.6 121 <1 12 68 <1 <1 <1 11 59 Proposed – Comparison portion for Alternative 1E-A 17.6 23 <1 <1 

Alternative 1E-A 16.1 10 t2/ <1 t2/ 

Proposed – Comparison portion for Alternative 1E-B 37.9 41 <1 1 39 <1 <1 7 Alternative 1E-B 59.3 57 7 58 13 <1 t2/ 

Proposed – Comparison portion for Alternative 1E-C 75.4 89 <1 12 68 t2/ <1 10 55 

Alternative 1E-C 48.7 72 10 <1 <1 7 1W(a) Proposed – Total Length 76.5 115 14 <1 10 t2/ <1 4 

Proposed – Comparison portion for Alternative 1W-A 20.3 22 9 

Alternative 1W-A 16.2 10 <1 

1W(c) Proposed – Total Length 70.6 97 7 <1 <1 5 47 Proposed – Total Length 96.7 210 17 63 53 1 Proposed – Comparison portion for Alternative 2A 28.8 31 3 21 2 Alternative 2A 28.4 49 5 14 3 Proposed – Comparison portion for Alternative 2B 7.0 11 1 2 2 

Alternative 2B 6.2 9 1 6 Proposed – Comparison portion for Alternative 2C 28.4 26 2 19 2 <1 Alternative 2C 24.4 32 3 4 <1 

3 Proposed – Total Length 56.5 96 15 40 36 

Proposed – Total Length 203.0 391 <1 50 32 2 t2/ 3 17 240 

Proposed – Comparison portion for Alternatives 4A-4F 90.2 166 9 20 <1 10 162 Alternative 4A 85.2 214 2 16 <1 1 

Alternative 4B 100.2 259 t2/ 2 35 1 

Alternative 4C 101.6 247 t2/ 3 36 1 

Alternative 4D 100.8 264 t2/ 3 36 1 <1 

Alternative 4E 102.2 248 t2/ 3 38 1 <1 Alternative 4F 87.5 222 2 15 <1 1 3 38 

Proposed – Total Length 54.6 95 1 t2/ 13 111 

Proposed – Comparison portion for Alternatives 5A,B 25.3 29 1 t2/ 13 111 Alternative 5A 33.7 37 <1 6 59 Alternative 5B 44.4 45 2 3 31 Proposed – Comparison portion for Alternative 5C 33.2 40 1 t2/ 13 111 Alternative 5C 26.1 12 2 <1 3 Proposed – Comparison portion for Alternative 5D 19.4 34 t2/ <1 

Alternative 5D 17.5 19 <1 t2/ <1 1 

Proposed – Comparison portion for Alternative 5E 5.8 16 

Alternative 5E 5.3 16 

6 Proposed – Total Length 0.5 15

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

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

45

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

1E

1W

2

Native Grass

Misc.

Conifer F

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

Segment

Number Proposed or Alternative Name

Segment 

Length 

(Miles)

Sagebrush

Saltbush

Greasewood

Dwarf Shrub

Other Shrub

Table D.6-3 Page 1 of 4
Gateway West Transmission Line Draft EIS

Operations 

Facilities

ROW 

Maintenance1/

Proposed – Total Length 118.1 76 2 t2/ <1 4 74 

Proposed – Comparison portion for Alternatives 7A,B 35.2 15 t2/ 4 74 

Alternative 7A 38.0 38 t2/ 8 90 Alternative 7B 46.4 47 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 3.1 3 Alternative 7G 3.2 <1 Proposed – Comparison portion for Alternatives 7H,I 118.1 76 2 t2/ <1 4 74 

Alternative 7H 127.5 139 8 t2/ 13 18 156 

Alternative 7I 173.4 213 <1 9 12 t2/ 19 140 

Proposed – Comparison portion 7/9 for Alternative 7J3/ 143.9 81 2 t2/ <1 4 74 

Alternative 7J3/ 202.1 222 <1 9 10 t2/ 19 138 

Proposed – Total Length 131.0 70 6 1 <1 <1 Proposed – Comparison portion for Alternative 8A 51.4 38 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 18.5 6Proposed – Total Length 161.7 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 49.5 23 6 Alternative 9B 53.2 3 9 2 

Proposed – Comparison portion for Alternative 9C 14.7 10 6 

Alternative 9C 15.3 2Proposed – Comparison portion for Alternatives 9D-9H 57.2 22 31 8 t2/ <1 

Alternative 9D 58.4 16 1 

Alternative 9E 68.7 66 6 1 <1 Alternative 9F 62.9 20 5 1 Alternative 9G 56.4 7 4 t2/ 

Alternative 9H 61.0 11 8 1 

10 Proposed – Total Length 33.6 5

1350 72 199 188 5 19 7 51 534 

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

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

3/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for Segment 9. 

miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 7 of the Proposed Route (118.1 miles) only.

789

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 Draft EIS

Operations 

Facilities

ROW 

Maintenance1/

Total Impacts

Proposed – Total Length 5 20 12 <1 t2/ 2 243 244 487 37 

Proposed – Comparison portion for Alternative 1E-A 3 20 5 t2/ 23 1 25 28 

Alternative 1E-A 5 18 2 4 t2/ 11 4 15 28 Proposed – Comparison portion for Alternative 1E-B 1 t2/ 2 <1 2 85 12 96 4 

Alternative 1E-B <1 11 3 t2/ t2/ t2/ 149 59 209 15 

Proposed – Comparison portion for Alternative 1E-C 1 t2/ 7 <1 2 207 222 428 9 

Alternative 1E-C 3 3 t2/ <1 87 32 119 6 

1W(a) Proposed – Total Length 11 13 10 <1 <1 148 60 208 34 Proposed – Comparison portion for Alternative 1W-A 2 8 5 t2/ 32 2 34 15 

Alternative 1W-A 1 22 3 3 t2/ 11 4 16 28 1W(c) Proposed – Total Length 11 12 5 <1 <1 t2/ 116 81 197 28 

Proposed – Total Length 27 7 16 2 <1 348 7 355 50 Proposed – Comparison portion for Alternative 2A 15 t2/ 1 57 <1 58 16 

Alternative 2A 13 5 t2/ 72 5 77 18 

Proposed – Comparison portion for Alternative 2B 1 t2/ <1 15 15 1 

Alternative 2B <1 <1 t2/ 16 3 20 1 

Proposed – Comparison portion for Alternative 2C 19 6 2 50 <1 50 27 Alternative 2C 10 t2/ 2 <1 39 39 12 

3 Proposed – Total Length 17 <1 9 <1 3 189 189 27 

Proposed – Total Length 34 16 19 31 <1 <1 549 845 1394 101 Proposed – Comparison portion for Alternatives 4A-4F 28 10 5 2 <1 218 337 555 44 Alternative 4A 11 9 8 4 <1 245 47 292 31 Alternative 4B 18 4 12 12 <1 t2/ 302 5 307 45 

Alternative 4C 21 3 12 14 <1 t2/ 290 4 294 50 Alternative 4D 18 4 12 12 <1 t2/ 309 8 317 46 Alternative 4E 21 3 12 15 <1 t2/ 294 7 301 50 Alternative 4F 7 8 8 4 <1 252 86 338 28 Proposed – Total Length 6 5 5 22 1 t2/ 135 397 533 38 Proposed – Comparison portion for Alternatives 5A,B <1 <1 <1 10 t2/ 60 275 335 13 

Alternative 5A 1 5 5 14 61 254 315 26 Alternative 5B 8 2 3 24 60 207 268 38 Proposed – Comparison portion for Alternative 5C 5 2 3 11 t2/ 74 307 380 21 Alternative 5C 21 1 2 7 <1 25 135 160 31 Proposed – Comparison portion for Alternative 5D 5 1 4 8 1 44 112 156 18 Alternative 5D 8 2 4 11 1 26 118 144 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 2 7 15 15 37 

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

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

45

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

1E

1W

2

Water

No Vegetation 

Data

Total Natural Vegetation

Total 

Disturbed a

Semi-natu

Vegatatio

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 3 of 4
Gateway West Transmission Line Draft EIS

Operations 

Facilities

ROW 

Maintenance1/

Total Impacts

Proposed – Total Length 19 22 7 85 t2/ t2/ 97 356 453 133 

Proposed – Comparison portion for Alternatives 7A,B 1 4 1 15 t2/ 25 200 225 21 

Alternative 7A 8 4 4 17 62 209 271 33 Alternative 7B 11 <1 3 26 t2/ 59 106 165 40 Proposed – Comparison portion for Alternative 7C 13 3 <1 11 9 9 27 Alternative 7C 12 8 <1 6 t2/ <1 <1 27 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 <1 <1 4 13 16 2 Alternative 7E 1 2 t2/ <1 5 22 27 3 

Proposed – Comparison portion for Alternative 7F <1 5 1 9 11 81 92 16 Alternative 7F 3 6 <1 5 9 86 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 Alternatives 7H,I 19 22 7 85 t2/ t2/ 97 356 453 133 

Alternative 7H 62 14 11 45 t2/ t2/ 208 566 774 132 Alternative 7I 77 38 5 40 <1 t2/ 290 623 913 161 

Proposed – Comparison portion for Alternative 7J 36 42 10 103 <1 t2/ 103 356 459 190 Alternative 7J 130 42 5 40 <1 t2/ 294 552 846 218 Proposed – Total Length 62 79 10 17 <1 78 <1 79 167 Proposed – Comparison portion for Alternative 8A 16 25 3 16 <1 39 <1 39 60 Alternative 8A 42 28 4 23 t2/ 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 16 2 t2/ 19 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 6 21 Proposed – Total Length 71 131 12 35 <1 t2/ 111 1 112 248 

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

Alternative 9A 10 4 <1 <1 <1 t2/ 2 2 16 

Proposed – Comparison portion for Alternative 9B 29 60 3 <1 t2/ t2/ 29 1 30 93 

Alternative 9B 19 36 1 14 <1 14 <1 14 71 Proposed – Comparison portion for Alternative 9C 2 6 2 t2/ 16 1 17 10 

Alternative 9C 12 10 2 1 t2/ 3 2 2 26 

Proposed – Comparison portion for Alternatives 9D-9H 9 16 5 14 <1 62 62 44 Alternative 9D 24 34 3 2 t2/ 17 1 18 63 

Alternative 9E 36 23 <1 1 t2/ t2/ 74 74 61 

Alternative 9F 21 33 4 8 t2/ t2/ 27 27 66 

Alternative 9G 31 34 4 3 t2/ t2/ 11 1 13 72 

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

10 Proposed – Total Length 9 24 11 33 <1 t2/ 5 5 76 

272 353 128 224 8 14 2034 1992 4026 977 

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

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

3/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for Segment 9. T

the corresponding portion of Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 7 of the Pro

789

Water

No Vegetation Data

Total 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 Draft EIS

Table D.6-4. Impacts (acres) to Vegetation from Two Single-Circuit Construction

Construction 

Facilities

ROW Clearing1/

Total Impacts

Proposed – Total Length 96.7 1012 142 287 284 5 Proposed – Comparison portion for Alternative 2A 28.8 252 16 155 14 Alternative 2A 28.4 319 30 90 20 Proposed – Comparison portion for Alternative 2B 7.0 85 9 23 13 Alternative 2B 6.2 53 7 34 Proposed – Comparison portion for Alternative 2C 28.4 194 7 121 36 3 Alternative 2C 24.4 269 19 29 2 

3 Proposed – Total Length 56.5 401 75 259 187 

Proposed – Total Length 203.0 2118 8 190 199 17 < 1 20 90 223 313 Proposed – Comparison portion for Alternatives 4A-4F 90.2 966 73 114 4 59 151 210 Alternative 4A 85.2 1250 20 28 89 4 6 Alternative 4B 100.2 1416 20 30 178 4 Alternative 4C 101.6 1358 20 37 179 4 Alternative 4D 100.8 1409 20 36 185 4 < 1 < 1 Alternative 4E 102.2 1356 20 38 186 4 < 1 < 1 Alternative 4F 87.5 1264 20 29 76 2 6 19 35 54 

3531 225 737 671 17 < 1 25 90 223 313 

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

4

Segment

Length

(Miles)

Total of All Proposed Segments (grey shaded areas)

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

2

Segment

Number Proposed or Alternative Name

Sagebrush

Saltbush

Other Shrub

Native Grass

Misc.

Conifer Forest 

Greasewood

Dwarf Shrub

Table D.6-4 Page 1 of 2
Gateway West Transmission Line Draft EIS

Table D.6-4 Impacts (acres) to Vegetation from Two Single Circuit Construction cont.

Construction 

Facilities

ROW Clearing1/

Proposed – Total Length 96.7 132 38 45 13 3 1742 7 Proposed – Comparison portion for Alternative 2A 28.8 71 t2/ 7 < 1 1 441 < 1 

Alternative 2A 28.4 80 15 < 1 < 1 474 5 Proposed – Comparison portion for Alternative 2B 7.0 8 t2/ 3 t2/ < 1 131 

Alternative 2B 6.2 4 2 3 t2/ 105 4 

Proposed – Comparison portion for Alternative 2C 28.4 84 37 6 < 1 < 1 362 < 1 Alternative 2C 24.4 81 < 1 7 10 319 

3 Proposed – Total Length 56.5 101 < 1 33 3 5 938 

Proposed – Total Length 203.0 221 136 61 300 5 12 2971 785 Proposed – Comparison portion for Alternatives 4A-4F 90.2 182 51 17 19 < 1 8 1323 308 Alternative 4A 85.2 49 35 19 40 7 < 1 1483 46 Alternative 4B 100.2 73 19 36 91 6 2 1709 5 Alternative 4C 101.6 113 17 35 108 5 1 1652 4 Alternative 4D 100.8 81 19 35 93 5 2 1711 7 Alternative 4E 102.2 113 17 34 109 5 1 1659 7 Alternative 4F 87.5 50 34 20 45 3 < 1 1493 78 

454 175 139 300 21 20 5651 792 

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

No Vegetation Data Segment Length (Miles)

42

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

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

Segment

Number Proposed or Alternative Name

Agriculture

Total of All Proposed Segments (grey shaded areas)

Disturbed/

Developed

Water

Total Natural V

Disturbed 

Sagebrush

Disturbed 

Grassland 

Table D.6-4 Page 2 of 2
Gateway West Transmission Line Draft EIS

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

Construction 

Facilities

ROW 

Clearing

Construct

Facilities

Casper 14 12 20 t1/ 

Rawlins 86 18 25 t1/ 

Alternative 1E-B Rawlins 102 6 11 <1 

Casper 25 <1 1 <1 Rawlins 111 <1 <1 <1 Casper 36 <1 <1 <1 

Rawlins 139 <1 

Alternative 1W-A No BLM Land Crossed

Casper 26 6 13 <1 Rawlins 211 1 

Proposed – Total Length Rawlins 548 <1 5 4 Alternative 2A Rawlins 138 3 Alternative 2B Rawlins 27 

Alternative 2C Rawlins 129 

Rawlins 141 <1 Rock Springs 255 5 Kemmerer 575 85 193 5 Pocatello 79 6 15 2 Rock Springs 330 1 Kemmerer 551 10 25 8 Pocatello 26 <1 Rock Springs 17 Kemmerer 616 2 3 1 Pocatello 37 <1 Rock Springs 56 <1 

Kemmerer 576 1 3 1 Pocatello 36 <1 Rock Springs 56 <1 Kemmerer 636 3 6 <1 Pocatello 37 <1 Rock Springs 57 <1 Kemmerer 605 2 5 <1 Pocatello 34 <1 Rock Springs 57 <1 Kemmerer 564 32 61 8 Pocatello 26 <1 Rock Springs 18 Burley 18 Pocatello 60 78 145 t1/ 

Alternative 5A Pocatello 54 82 148 t1/ 

Alternative 5B Pocatello 79 49 108 <1 Alternative 5C Pocatello <1 2 Alternative 5D Burley 1 Alternative 5E Burley 5 t1/ 

6 Proposed – Total Length No BLM Land Crossed

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

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

5

Proposed – Total Length

3 Proposed – Total Length4

Proposed – Total LengthAlternative 4AAlternative 4BAlternative 4CAlternative 4DAlternative 4EAlternative 4F

Bureau of Land Management Field Office Shrubland

1W

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

2

Forest/Woodland We

1E

Proposed – Total LengthAlternative 1E-C

Segment 

Number Proposed or Alternative Name

Table D.6-5 Page 1 of 3
Gateway West Transmission Line Draft EIS

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

Construction 

Facilities

ROW 

Clearing

Construct

Facilities

Burley 205 27 37 t1/ 

Pocatello 47 36 92 

Alternative 7A Pocatello 29 69 107 <1 Alternative 7B Pocatello 75 23 41 <1 Alternative 7C Burley 84 Alternative 7D Burley 

Alternative 7E Burley 20 1 7 Alternative 7F Burley 14 29 42 Alternative 7G Burley 38 

Burley 482 83 109 t1/ 

Pocatello 69 21 32 <1 Burley 495 91 112 1 Pocatello 69 21 32 <1 Wells 88 21 36 <1 Burley 712 91 112 1 Pocatello 69 22 32 1 

Wells 88 21 36 <1 Four Rivers 527 <1 Jarbidge 20 

Owyhee 63 t1/ 

Shoshone 235 t1/ 

Four Rivers 66 <1 Jarbidge 143 Shoshone 55 Four Rivers 179 <1 Owyhee 1 

Alternative 8C Four Rivers 29 Alternative 8D Four Rivers 4 Alternative 8E Four Rivers 192 <1 

Bruneau 169 

Burley 163 

Four Rivers 83 <1 Jarbidge 291 <1 <1 <1 Owyhee 302 t1/ 

Alternative 9A Burley 63 

Burley 33 Jarbidge 171 <1 Burley 33 Jarbidge t1/ 

Bruneau 3 

Four Rivers 353 <1 <1 1 Owyhee 7 Bruneau 324 <1 Four Rivers 14 1 Jarbidge 22 

Owyhee 367 <1 Bruneau 79 Four Rivers 305 2 Jarbidge <1 Owyhee 7 

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

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

Alternative 9F

8

Proposed – Total LengthAlternative 8AAlternative 8B

9

Proposed – Total LengthAlternative 9BAlternative 9CAlternative 9DAlternative 9E

Forest/Woodland We

7

Proposed – Total LengthAlternative 7HAlternative 7IAlternative 7J

Segment 

Number Proposed or Alternative Name

Bureau of Land Management Field Office Shrubland

Table D.6-5 Page 2 of 3
Gateway West Transmission Line Draft EIS

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

Construction 

Facilities

ROW 

Clearing

Construct

Facilities

Bruneau 3 

Four Rivers 375 <1 <1 1 Owyhee 9 

Bruneau 78 Four Rivers 327 2 Jarbidge <1 Owyhee 9 

10 Proposed – Total Length Shoshone 67 

4689 268 547 20 

Construction 

Facilities

ROW 

Clearing

Construct

Facilities

Proposed – Total Length Medicine Bow-Routt 8 16 22 <1 Alternative 1E-C Medicine Bow-Routt 11 <1 3 t1/ 

Wa Proposed – Total Length Medicine Bow-Routt 15 <1 <1 <1 Wc Proposed – Total Length Medicine Bow-Routt 17 10 17 

4 Proposed – Total Length Caribou-Targhee 22 90 221 1 

Proposed – Total Length Caribou-Targhee t1/ 

Caribou-Targhee t1/ Sawtooth 75 84 171 2 Caribou-Targhee t1/ Sawtooth 289 154 175 2 Caribou-Targhee t1/ Sawtooth 134 113 131 <1 

61 117 261 2 

Construction 

Facilities

ROW 

Clearing

Construct

Facilities

Proposed – Total Length Bureau of Reclamation 36 <1 Alternative 4A Bureau of Reclamation 38 <1 

Bureau of Reclamation 4 Fish and Wildlife Service <1 

Bureau of Reclamation 4 Fish and Wildlife Service <1 <1 Bureau of Reclamation 4 Fish and Wildlife Service <1 Bureau of Reclamation 4 Fish and Wildlife Service <1 <1 

Alternative 4F Bureau of Reclamation 38 <1 

5 Alternative 5C Indian Reservation 195 15 36 5 

Proposed – Total Length Bureau of Reclamation 14 

Alternative 8B Bureau of Reclamation 8 t1/ 

Alternative 8C Bureau of Reclamation <1 

9 Proposed – Total Length Military Reservations/Corps of Engineer 2 

10 Proposed – Total Length National Park Service 

52 <1 

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

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

Alternative 4EProposed or Alternative Name Other Federal Lands Shrubland

Forest/Woodland We

8

Total of All Proposed Segments (grey shaded areas)

4

Alternative 4BAlternative 4CAlternative 4D

1E

1W

7

Alternative 7HAlternative 7IAlternative 7J

Total of All Proposed Segments (grey shaded areas)

Total of All Proposed Segments (grey shaded areas)

Segment 

Number Proposed or Alternative Name National Forest Shrubland

Forest/Woodland We

Segment 

Number

We

9

(cont.)

Alternative 9GAlternative 9H

Segment 

Number Proposed or Alternative Name

Bureau of Land Management Field Office Shrubland

Forest/Woodland

Table D.6-5 Page 3 of 3

Gateway West Transmission Line Draft EIS

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

Operations 

Facilities

ROW 

Maintenance

Operations 

Facilities

Main

Casper 4 3 25 t1/ 

Rawlins 17 5 32 t1/ 

Alternative 1E-B Rawlins 24 2 14 t1/ 

Casper 6 <1 2 t1/ 

Rawlins 29 t1/ <1 <1 

Casper 11 t1/ 1 t1/ 

Rawlins 40 t1/ 

Alternative 1W(a) No BLM Land Crossed

Casper 7 2 16 t1/ 

Rawlins 33 <1 

Proposed – Total Length Rawlins 136 t1/ 6 1 Alternative 2A Rawlins 26 <1 Alternative 2B Rawlins 6 

Alternative 2C Rawlins 21 

Rawlins 34 <1 Rock Springs 52 1 Kemmerer 123 15 247 <1 Pocatello 14 1 19 <1 Rock Springs 62 <1 Kemmerer 125 3 30 1 Pocatello 5 t1/ 

Rock Springs 4 

Kemmerer 146 <1 4 <1 Pocatello 8 <1 Rock Springs 12 t1/ Kemmerer 135 <1 3 <1 Pocatello 8 <1 Rock Springs 12 t1/ Kemmerer 155 <1 7 <1 Pocatello 8 <1 Rock Springs 13 t1/ Kemmerer 142 <1 6 <1 Pocatello 7 <1 Rock Springs 13 t1/ Kemmerer 126 7 80 1 Pocatello 5 t1/ 

Rock Springs 5 

Burley <1 

Pocatello 13 15 191 t1/ 

Alternative 5A Pocatello 10 17 191 t1/ 

Alternative 5B Pocatello 15 8 139 t1/ Alternative 5C Pocatello t1/ 1 

Alternative 5D Burley <1 

Alternative 5E Burley <1 t1/ 

6 Proposed – Total Length No BLM Land Crossed

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

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

Forest/Woodland Wetland/Riparian

1E

Proposed – Total LengthAlternative 1E-C

Segment 

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

1W

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

23 Proposed – Total Length4

Proposed – Total LengthAlternative 4AAlternative 4BAlternative 4CAlternative 4DAlternative 4EAlternative 4F

5

Proposed – Total Length

Table D.6-6 Page 1 of 3
Gateway West Transmission Line Draft EIS

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

Operations 

Facilities

ROW 

Maintenance

Operations 

Facilities

Main

Burley 26 2 52 t1/ 

Pocatello 5 7 115 

Alternative 7A Pocatello 8 16 138 t1/ 

Alternative 7B Pocatello 15 5 53 t1/ Alternative 7C Burley 10 Alternative 7D Burley 

Alternative 7E Burley 3 <1 8 

Alternative 7F Burley 3 3 57 Alternative 7G Burley 2 

Burley 67 13 147 t1/ 

Pocatello 13 5 44 <1 Burley 80 9 145 <1 Pocatello 13 5 44 <1 Wells 18 5 45 t1/ 

Burley 97 9 145 <1 Pocatello 13 5 44 <1 Wells 18 5 45 t1/ Four Rivers 56 t1/ 

Owyhee 5 t1/ 

Shoshone 29 t1/ 

Four Rivers 7 <1 

Jarbidge 15 

Shoshone 6 

Four Rivers 19 t1/ 

Owyhee t1/ 

Alternative 8C Four Rivers 4 

Alternative 8D Four Rivers t1/ 

Alternative 8E Four Rivers 19 

Bruneau 27 

Burley 22 

Four Rivers 11 <1 Jarbidge 50 t1/ 1 t1/ 

Owyhee 39 t1/ 

Alternative 9A Burley 7 

Burley 6 

Jarbidge 21 t1/ 

Burley 9 

Jarbidge t1/ 

Bruneau <1 Four Rivers 37 t1/ 1 t1/ 

Owyhee <1 Bruneau 41 t1/ Four Rivers 2 t1/ 

Jarbidge 2 Owyhee 51 t1/ 

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

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

Segment 

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

7

Proposed – Total LengthAlternative 7HAlternative 7IAlternative 7JAlternative 9CAlternative 9DAlternative 9E

Forest/Woodland Wetland/Riparian

8

Proposed – Total LengthAlternative 8AAlternative 8B

9

Proposed – Total LengthAlternative 9B

Table D.6-6 Page 2 of 3
Gateway West Transmission Line Draft EIS

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

Operations 

Facilities

ROW 

Maintenance

Operations 

Facilities

Main

Bruneau 8 

Four Rivers 32 <1 Jarbidge <1 Owyhee <1 Bruneau <1 Four Rivers 37 t1/ 1 t1/ 

Owyhee <1 

Bruneau 8 

Four Rivers 32 <1 Jarbidge <1 Owyhee <1 

10 Proposed – Total Length Shoshone 10 

825 50 704 4 

Operations 

Facilities

ROW 

Maintenance

Operations 

Facilities

Main

Proposed – Total Length Medicine Bow-Routt 2 5 27 t1/ 

Alternative 1E-C Medicine Bow-Routt 3 <1 3 t1/ 

Wa Proposed – Total Length Medicine Bow-Routt 4 <1 1 <1 Wc Proposed – Total Length Medicine Bow-Routt 1 3 22 

4 Proposed – Total Length Caribou-Targhee 4 21 278 <1 

Proposed – Total Length Caribou-Targhee t1/ 

Caribou-Targhee t1/ Sawtooth 8 17 218 t1/ 

Caribou-Targhee t1/ 

Sawtooth 70 22 225 1 

Caribou-Targhee t1/ 

Sawtooth 34 18 169 <1 

12 29 328 <1 

Operations 

Facilities

ROW 

Maintenance

Operations 

Facilities

Main

Proposed – Total Length Bureau of Reclamation 10 t1/ 

Alternative 4A Bureau of Reclamation 11 t1/ 

Bureau of Reclamation <1 

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

Alternative 4F Bureau of Reclamation 11 t1/ 

5 Alternative 5C Indian Reservation 26 3 46 <1 

Proposed – Total Length Bureau of Reclamation 2 Alternative 8B Bureau of Reclamation <1 t1/ Alternative 8C Bureau of Reclamation t1/ 

9 Proposed – Total Length Military Reservations/Corps of Engineers 1 

10 Proposed – Total Length National Park Service 

14 t1/ 

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

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

Shrubland

Forest/Woodland Wetland/Riparian

9

(cont.)

Alternative 9FAlternative 9GAlternative 9H

Segment 

Number Proposed or Alternative Name Bureau of Land Management Field Office

Total of All Proposed Segments (grey shaded areas)

Segment 

Number Proposed or Alternative Name National Forest Shrubland

Forest/Woodland Wetland/Riparian

1E

1W

7

Alternative 7HAlternative 7IAlternative 7J

Total of All Proposed Segments (grey shaded areas)

Segment 

Number Proposed or Alternative Name

Forest/Woodland Wetland/Riparian

8

Total of All Proposed Segments (grey shaded areas)

4

Alternative 4BAlternative 4CAlternative 4DAlternative 4E

Other Federal Lands Shrubland

Table D.6-6 Page 3 of 3

Gateway West Transmission Line Draft 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 (Declared) State of Idaho6/ Stat

Black henbane Hyoscyamus niger 1/ Yes -- Albany, Converse, Lincoln, Natrona, Sweetwater Control C

Buffalobur Solanum rostratum Yes -- Converse, Natrona Control 

Canada thistle Cirsium arvense 1/ Yes X -- Containment C

Common burdock Arctium minus 1/ Yes X -- -- 

Common crupina Crupina vulgaris 1/ Yes -- Converse Control C

Common St. Johnswort Hypericum perforatum 1/ Yes X -- -- C

Common Tansy Tanacetum vulgare 1/ Yes X -- -- 

Dalmatian toadflax Linaria dalmatica 1/ Yes X -- Containment C

Diffuse knapweed Centaurea diffusa 1/ Yes X -- Containment CDyer’s woad Isatis tinctoria 1/ Yes X -- Control C

Eurasian watermilfoil Myriophyllum spicatum 1/ Yes -- -- Control C

Field bindweed Convolvulus arvensis 1/ Yes X -- Containment 

Giant Knotweed Polygonum sachalinense -- -- Control 

Hairy whitetop, Hoary cress Cardaria pubescens 1/ Yes X 7/ -- -- 

Hoary alyssum Berteroa incana Yes Containment 

Houndstongue Cynoglossum officinale 1/ Yes X -- Containment C

Iberian starthistle Centaurea iberica 1/ Yes -- Converse -- C

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

Jointed goatgrass Aegilops cylindrica 1/ Yes -- Converse Containment Leafy spurge Euphorbia esula 1/ Yes X -- Containment C

Matgrass Nardus stricta 1/ Yes -- -- Control 

Mayweed chamomile Anthemis cotula 1/ Yes -- -- -- C

Milium Milium vernale Yes -- -- Containment 

Musk thistle Carduus nutans 1/ Yes X -- Control COrange hawkweed Hieracium aurantiacum 1/ Yes -- Converse Control Oxeye daisy Leucanthemum vulgare ( formerly Chrysanthemum leucanthemum) 1/ Yes X -- Containment Parrotfeather Milfoil Myriophyllum aquaticum Yes -- -- Control Perennial pepperweed, tall whitetop Lepidium latifolium 1/ Yes X -- Containment C

Perennial sowthistle Sonchus arvensis 1/ Yes X -- Control CPlumeless thistle Carduus acanthoides 1/ Yes X -- Control 

Poison hemlock Conium maculatum 1/ Yes -- -- Containment C

Puncture vine Tribulus terrestris Yes -- Natrona Containment CPurple loosestrife Lythrum salicaria 1/ Yes X -- Containment C

Quackgrass Agropyron repens 1/ Yes X -- -- 

Rush skeletonweed Chondrilla juncea 1/ Yes -- Converse Containment C

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 2008a,b; NDA 2009. “—” indictates not listed. 5/ Distribution based on Invaders database (University of Montana-Missoula 2009), Plants database (NRCS 2009), and ISDA (2008). 

 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-underling m

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.

Listed as Noxious3/,4/

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

Table D.8-1 Page 1 of 3
Gateway West Transmission Line Draft 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 (Declared) State of Idaho6/ Stat

Russian knapweed Acroptilon repens 1/ Yes X -- Control CRussian olive Elaeagnus angustifolia 1/ Yes X -- -- 

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

Scotch broom Cytisus scoparius 1/ Yes -- Converse Control 

Scotch thistle Onopordum acanthium 1/ Yes X -- Containment CSilverleaf nightshade Solanum elaeagnifolium Yes -- -- Control CSkeletonleaf bursage Ambrosia tomentosa Yes X -- Control Spotted knapweed Centaurea maculosa 1/ Yes X -- Containment C

Syrian beancaper Zygophyllum fabago 1/ Yes -- Converse EDRR C

Tansy ragwort Senecio jacobaea 1/ Yes -- Converse Containment Vipers blugloss Echium vulgare 1/ Yes -- -- Control Water hemlock Cicuta maculata Yes -- -- -- C

White Bryony Bryonia alba Yes Containment 

Whitetop, hoary cress Cardaria draba 1/ Yes X 7/ -- Containment CYellow hawkweed Hieracium caespitosum, H. pratense 1/ Yes -- Converse Control 

Yellow starthistle Centaurea solstitialis 1/ Yes -- -- Containment CYellow toadflax Linaria vulgaris 1/ Yes X -- Containment CAbsinth wormwood Artemisia absinthium Yes -- Converse -- 

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

Baby’s breath Gypsophila paniculata 1/ Yes -- Converse -- Bermuda grass Cynodon dactylon 1/ Yes -- -- -- Bull thistle Cirsium vulgare 1/ Yes -- Converse, Lincoln -- 

Bur buttercup Ranunculus testiculatus Yes -- Converse -- 

Camelthorn Alhagi camelorum 1/ Yes -- -- -- CCarolina horse-nettle Solanum carolinense Yes -- -- -- C

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

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 2008a,b; NDA 2009. “—” indictates not listed. 5/ Distribution based on Invaders database (University of Montana-Missoula 2009), Plants database (NRCS 2009), and ISDA (2008). 

 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-underling m

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.

Scientific Name

Species on State Noxious Weed List cont.

Invasive Exotic 

Species2/

Other Species Not on State Weed Lists, or Not Likely to Occur Where Regulated by State

Listed as Noxious3/,4/ 

Common Name

Table D.8-1 Page 2 of 3
Gateway West Transmission Line Draft 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 (Declared) State of Idaho6/ Stat

Halogeton Halogeton glomeratus 1/ Yes -- Carbon, Converse, Natrona, -- 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 -- C

Mountain thermopsis Thermopsis montana Native -- Sweetwater -- 

Musk mustard, blue mustard Chorispora tenella Yes -- Converse -- 

Plains pricklypear Opuntia polyacantha Native -- Carbon -- 

Redstem filaree Erodium cicutarium Yes -- Converse -- 

Russian thistle Salsola iberica Yes -- -- -- 

Scentless chamomile Tripleurospermum inodorum 1/ Yes -- Converse -- 

Showy milkweed Asclepias speciosa Native -- Converse, Natrona -- 

Sulfur cinquefoil Potentilla recta 1/ Yes -- Converse -- C

Teasel Dipsacus fullonum 1/ Yes -- Converse Water hemlock Cicuta maculata Native -- -- -- C

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 2008a,b; NDA 2009. “—” indictates not listed. 5/ Distribution based on Invaders database (University of Montana-Missoula 2009), Plants database (NRCS 2009), and ISDA (2008). 

 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-underling m

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 Invasive Exotic Species2/ Listed as Noxious3/,4/ 

Other Species Not on State Weed Lists, or Not Likely to Occur Where Regulated by State

Table D.8-1 Page 3 of 3

Gateway West Transmission Line Draft EIS

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

Herbaceous 

Wetlands

Shrub 

Wetlands

Mixed 

Wetlands

Herbaceous 

Riparian

Shr

Ripa

Construction 

Facilities

Construction 

Facilities

Construction 

Facilities

ROW Clearing1/

Total Construction 

Impacts

Construction 

Facilities

Construction 

Facilities

ROW Clearing1/

Total Construction 

Impacts

Construction 

Facilities

Construction 

Filii

Proposed – Total Length 100.6 2.5 0.2 0.4 0.4 0.1 2.9 0.4 3.3 3.5 1.

Proposed – Comparison portion for Alternative 1E-A 17.6 t2/ t2/ t2/ t2/ t2

Alternative 1E-A 16.1 0.3 0.2 1.7 1.9 0.5 1.7 2.2 t2/ 0.4 Proposed – Comparison portion for Alternative 1E-B 37.9 0.1 t2/ 0.2 0.2 2.0 0.

Alternative 1E-B 59.3 1.8 1.8 1.8 0.3 2.Proposed – Comparison portion for Alternative 1E-C 75.4 2.5 0.2 0.4 0.4 0.1 2.9 0.4 3.3 3.4 1.Alternative 1E-C 48.7 1.5 t2/ t2/ 0.2 0.3 1.6 0.2 1.8 1.2 

1W(a) Proposed – Total Length 76.5 2.1 1.0 t2/ 3.1 3.1 1.2 1.

Proposed – Comparison portion for Alternative 1W-A 20.3 t2/ t2/ t2/ t2/ 0.Alternative 1W-A 16.2 0.5 0.7 2.4 3.1 1.2 2.4 3.6 0.1 0.2 

1W(c) Proposed – Total Length 70.6 1.8 0.3 0.6 1.8 2.4 1.0 3.7 1.8 5.5 1.8 2.

Proposed – Total Length 96.7 2.2 0.3 2.5 2.5 0.6 6.

Proposed – Comparison portion for Alternative 2A 28.8 2.0 0.1 2.1 2.1 t2/ 0.Alternative 2A 28.4 0.4 1.9 t2/ 2.3 2.3 1.8 1.

Proposed – Comparison portion for Alternative 2B 7.0 t2/ t2/ t2/ t2/ 0.

Alternative 2B 6.2 t2/ 0.1 0.2 0.2 0.Proposed – Comparison portion for Alternative 2C 28.4 0.1 t2/ 0.2 0.2 0.5 0.Alternative 2C 24.4 0.

3 Proposed – Total Length 56.5 3.9 0.7 t2/ 4.7 4.7 t2/ 7.

Proposed – Total Length 203.0 35.7 4.2 t2/ 1.8 1.9 3.4 43.4 1.8 45.2 3.5 12

Proposed – Comparison Portion for Alternatives 4A-4F 90.2 8.2 0.7 t2/ 0.8 0.8 0.4 9.3 0.8 10.1 1.2 4.

Alternative 4A 85.2 18.7 7.8 0.5 t2/ 0.6 0.9 27.9 t2/ 28.0 18.2 5.

Alternative 4B 100.2 15.0 1.0 0.3 0.3 5.2 21.6 21.6 15.2 3.

Alternative 4C 101.6 12.8 1.6 0.3 0.3 0.2 14.9 14.9 14.9 3.4 

Alternative 4D 100.8 15.2 1.1 0.3 0.3 2.3 18.9 18.9 15.1 3.

Alternative 4E 102.2 13.0 1.6 0.3 0.3 0.4 15.3 15.3 14.9 3.

Alternative 4F 87.5 13.3 1.3 0.4 0.8 1.2 0.9 15.9 0.8 16.7 17.1 6.

Proposed – Total Length 54.6 1.0 1.2 1.5 3.8 3.8 0.8 3.Proposed – Comparison portion for Alternatives 5A,B 25.3 t2/ 1.2 1.5 2.8 2.8 0.4 t2Alternative 5A 33.7 0.2 0.2 0.2 t2/ 0.

Alternative 5B 44.4 t2/ t2/ 0.1 0.1 t2/ 0.4 

Proposed – Comparison portion for Alternative 5C 33.2 t2/ 1.2 1.3 1.3 0.4 1.

Alternative 5C 26.1 2.9 0.6 3.5 3.5 t2/ t2

Proposed – Comparison portion for Alternative 5D 19.4 1.1 1.1 1.1 0.4 2.

Alternative 5D 17.5 0.7 1.9 2.6 0.7 1.9 2.6 0.7 0.

Proposed – Comparison portion for Alternative 5E 5.8 0.

Alternative 5E 5.3 0.

6 Proposed – Total Length 0.5

Note: Due to permit criteria, acreages reported here are rounded to tenths of an acre; therefore, numbers are inexact and columns/rows may not sum exactly

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

524

Segment 

Number Proposed or Alternative Name

Segment 

Length 

(miles)

Forested Wetlands Total Wetlands 

1E

1W

Table D.9-1 Page 1 of 2
Gateway West Transmission Line Draft EIS

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

Herbaceous 

Wetlands

Shrub 

Wetlands

Mixed 

Wetlands

Herbaceous 

Riparian

Shr

Ripa

Construction 

Facilities

Construction 

Facilities

Construction 

Facilities

ROW Clearing1/

Total Construction 

Impacts

Construction 

Facilities

Construction 

Facilities

ROW Clearing1/

Total Construction 

Impacts

Construction 

Facilities

Construction 

Filii

Proposed – Total Length 118.1 1.4 0.6 1.4 3.4 3.4 2.6 0.

Proposed – Comparison portion for Alternatives 7A,B 35.2 1.3 1.3 1.3 0.7 0.Alternative 7A 38.0 t2/ 0.3 1.7 2.2 2.2 0.2 1.

Alternative 7B 46.4 0.1 1.

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

Alternative 7C 20.3Proposed – Comparison portion for Alternative 7D 6.2 1.1 1.1 1.1 1.7 t2

Alternative 7D 6.8 1.1 1.1 1.1 1.7 t2Proposed – Comparison portion for Alternative 7E 3.8Alternative 7E 4.5Proposed – Comparison portion for Alternative 7F 10.5 0.4 0.4 0.4 t2/ Alternative 7F 10.8 t2/ t2

Proposed – Comparison portion for Alternative 7G 3.1 t2/ t2/ t2/ Alternative 7G 3.2 t2/ t2/ t2/ 0.

Proposed – Comparison portion for Alternatives 7H,I 118.1 1.4 0.6 1.4 3.4 3.4 2.6 0.

Alternative 7H 127.5 2.2 3.1 t2/ t2/ t2/ 5.4 5.4 0.6 1.

Alternative 7I 173.4 5.0 2.8 0.7 2.5 3.2 1.3 9.8 2.5 12.3 3.8 2.

Proposed – Comparison portion 7/9 for Alternative 7J3/ 143.9 1.7 0.6 1.4 3.6 3.6 2.6 0.

Alternative 7J3/ 202.1 5.3 3.0 t2/ t2/ 1.3 9.5 9.5 3.2 2.

Proposed – Total Length 131.0 3.2 t2/ 3.3 3.3 0.5 0.

Proposed – Comparison portion for Alternative 8A 51.4 1.5 t2/ 1.6 1.6 t2/ t2

Alternative 8A 53.6 0.1 0.2 t2/ 0.4 0.4 t2/ t2

Proposed – Comparison portion for Alternative 8B 45.3 0.4 0.

Alternative 8B 45.8 4.0 1.7 5.8 5.8 0.9 0.

Proposed – Comparison portion for Alternative 8C 6.5 t2/ t2Alternative 8C 6.4 t2

Proposed – Comparison portion for Alternative 8D 6.9Alternative 8D 8.1Proposed – Comparison portion for Alternative 8E 7.0Alternative 8E 18.5 0.2 

Proposed – Total Length 161.7 0.4 0.3 t2/ 0.8 0.8 0.2 1.4 

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

Alternative 9A 7.7 0.3 

Proposed – Comparison portion for Alternative 9B 49.5 0.2 0.

Alternative 9B 53.2 0.2 

Proposed – Comparison portion for Alternative 9C 14.7 0.2 t2

Alternative 9C 15.3Proposed – Comparison portion for Alternatives 9D-9H 57.2 0.2 0.3 t2/ 0.6 0.6 t2/ 1.2 

Alternative 9D 58.4 0.3 0.4 0.7 0.7 0.3 0.4 

Alternative 9E 68.7 0.2 0.6 0.8 0.8 1.

Alternative 9F 62.9 0.5 0.7 t2/ 1.3 1.3 0.3 2.4 

Alternative 9G 56.4 0.7 0.4 1.1 1.1 0.1 1.Alternative 9H 61.0 0.9 0.7 t2/ 1.8 1.8 0.1 2.4 

10 Proposed – Total Length 33.6 0.

Total of Proposed Segments (grey shading) 54.3 8.8 0.7 4.0 4.7 7.7 71.5 4.0 75.5 14.8 38

Note: Due to permit criteria, acreages reported here are rounded to tenths of an acre; therefore, numbers are inexact and columns/rows may not sum exactly

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/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for Segment 9. The table above c

25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 7 of the Proposed Route (118.1 miles) only.

789

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 Draft EIS

Herbaceous 

Wetlands

Shrub 

Wetlands

Mixed 

Wetlands

Herbaceous 

Riparian

R

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 100.6 0.8 t2/ 0.4 0.4 t2/ 0.9 0.4 1.3 0.7 

Proposed – Comparison portion for Alternative 1E-A 17.6 t2/ 

Alternative 1E-A 16.1 t2/ t2/ 1.8 1.9 0.1 1.8 2.0 t2/ 

Proposed – Comparison portion for Alternative 1E-B 37.9 t2/ t2/ t2/ t2/ 0.5 Alternative 1E-B 59.3 0.3 0.3 0.3 0.1 Proposed – Comparison portion for Alternative 1E-C 75.4 0.8 t2/ 0.4 0.4 t2/ 0.9 0.4 1.3 0.7 

Alternative 1E-C 48.7 0.5 t2/ t2/ 0 0 0.5 0 0.7 0.3 

1W(a) Proposed – Total Length 76.5 0.4 0.2 t2/ 0.6 0.6 0.6 

Proposed – Comparison portion for Alternative 1W-A 20.3 t2/ t2/ t2/ t2/ 

Alternative 1W-A 16.2 0.2 0.2 2.9 3.0 0.3 2.9 3.2 t2/ 

1W(c) Proposed – Total Length 70.6 0.4 t2/ 0.2 2.2 2.3 0.1 0.7 2.2 2.9 0.5 

Proposed – Total Length 96.7 0.4 0.1 0.5 0.5 0.2 

Proposed – Comparison portion for Alternative 2A 28.8 0.3 t2/ 0.3 0.3 t2/ Alternative 2A 28.4 0.1 0.4 t2/ 0.5 0.5 0.3 

Proposed – Comparison portion for Alternative 2B 7.0 t2/ t2/ t2/ 

Alternative 2B 6.2 t2/ t2/ t2/ t2/ 

Proposed – Comparison portion for Alternative 2C 28.4 t2/ t2/ t2/ 0.1 Alternative 2C 24.4 

3 Proposed – Total Length 56.5 0.8 0.1 t2/ 0.9 0.9 t2/ 

Proposed – Total Length 203.0 7.3 1.0 t2/ 1.8 1.8 0.7 9.1 1.8 10.8 0.8 

Proposed – Comparison portion for Alternatives 4A-4F 90.2 1.7 0.2 t2/ 0.8 0.8 t2/ 2.0 0.8 2.8 0.3 

Alternative 4A 85.2 3.4 0.7 t2/ 0.2 0.2 0.2 4.2 0.2 4.4 1.0 

Alternative 4B 100.2 1.7 t2/ t2/ t2/ 0.5 2.3 2.3 0.4 Alternative 4C 101.6 1.2 0.2 t2/ t2/ 0.1 1.6 1.6 0.3 Alternative 4D 100.8 1.8 0.1 t2/ t2/ 0.5 2.5 2.5 0.4 Alternative 4E 102.2 1.3 0.3 t2/ t2/ 0.2 1.8 1.8 0.3 Alternative 4F 87.5 2.1 0.2 t2/ 0.8 0.8 t2/ 2.5 0.8 3.3 0.6 

Proposed – Total Length 54.6 t2/ t2/ 0.1 0.3 0.3 0.2 

Proposed – Comparison portion for Alternatives 5A,B 25.3 t2/ t2/ 0.1 0.2 0.2 t2/ 

Alternative 5A 33.7 t2/ t2/ t2/ t2/ 

Alternative 5B 44.4 t2/ t2/ t2/ t2/ t2/ Proposed – Comparison portion for Alternative 5C 33.2 t2/ t2/ t2/ t2/ 0.2 

Alternative 5C 26.1 t2/ t2/ t2/ t2/ 

Proposed – Comparison portion for Alternative 5D 19.4 t2/ t2/ t2/ 0.2 

Alternative 5D 17.5 t2/ 2.5 2.5 t2/ 2.5 2.5 t2/ 

Proposed – Comparison portion for Alternative 5E 5.8 

Alternative 5E 5.3 

6 Proposed – Total Length 0.5

Note: Due to permit criteria, acreages reported here are rounded to tenths of an acre; therefore, numbers are inexact and columns/rows may not sum exactly.

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

45

1E

1W

2

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 Draft EIS

Herbaceous 

Wetlands

Shrub 

Wetlands

Mixed 

Wetlands

Herbaceous 

Riparian

R

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 118.1 t2/ t2/ t2/ 0.1 0.1 0.2 

Proposed – Comparison portion for Alternatives 7A,B 35.2 0.1 Alternative 7A 38.0 t2/ t2/ 0.3 0.3 0.3 t2/ Alternative 7B 46.4 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 3.1 t2/ t2/ t2/ Alternative 7G 3.2 t2/ t2/ t2/ Proposed – Comparison portion for Alternatives 7H,I 118.1 t2/ t2/ t2/ 0.1 0.1 0.2 

Alternative 7H 127.5 0.2 0.2 t2/ 0.4 0.4 0.2 Alternative 7I 173.4 0.3 0.2 t2/ 3.2 3.2 0.5 1.0 3.2 4.2 1.2 

Proposed – Comparison portion 7/9 for Alternative 7J3/ 143.9 t2/ t2/ t2/ 0.1 0.1 0.2 

Alternative 7J3/ 202.1 0.4 0.2 0.5 1.1 1.1 0.8 

Proposed – Total Length 131.0 0.3 t2/ 0.3 0.3 0.2 

Proposed – Comparison portion for Alternative 8A 51.4 0.1 0.1 0.1 t2/ 

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

Proposed – Comparison portion for Alternative 8B 45.3 0.2 Alternative 8B 45.8 t2/ t2/ t2/ t2/ 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 18.5Proposed – Total Length 161.7 t2/ 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 49.5 t2/ Alternative 9B 53.2 

Proposed – Comparison portion for Alternative 9C 14.7 

Alternative 9C 15.3Proposed – Comparison portion for Alternatives 9D-9H 57.2 t2/ 0.1 t2/ 0.3 0.3 t2/ 

Alternative 9D 58.4 t2/ t2/ t2/ 

Alternative 9E 68.7 t2/ t2/ 0.1 0.1 

Alternative 9F 62.9 0.1 0.1 t2/ 0.3 0.3 

Alternative 9G 56.4 0.2 0.2 0.2 Alternative 9H 61.0 0.3 0.1 t2/ 0.5 0.5 

10 Proposed – Total Length 33.6

Total of Proposed Segments (grey shading) 10.5 1.9 0.2 4.4 4.6 1.0 13.7 4.4 18.0 3.4 

Note: Due to permit criteria, acreages reported here are rounded to tenths of an acre; therefore, numbers are inexact and columns/rows may not sum exactly.

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

9

3/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for Segment 9. The table abov

miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 7 of the Proposed Route (118.1 miles) only.

Total Wetlands 

78

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 Draft EIS

Table D.9-3 Impacts to Wetlands and Riparian Areas during Two Single-Circuit Construction (acres)

Herbaceous 

Wetlands

Shrub 

Wetlands

Mixed 

Wetlands

Herbaceous 

Riparian

S

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 96.7 2.6 0.4 3.0 3.0 0.7 

Proposed – Comparison portion for Alternative 2A 28.8 2.3 0.2 2.5 2.5 t2/ 

Alternative 2A 28.4 0.4 2.1 6.0 8.4 8.4 2.1 

Proposed – Comparison portion for Alternative 2B 7.0 t2/ t2/ t2/ t2/ 

Alternative 2B 6.2 t2/ 6.1 6.1 6.1 

Proposed – Comparison portion for Alternative 2C 28.4 0.2 0.1 0.3 0.3 0.5 

Alternative 2C 24.4 

3 Proposed – Total Length 56.5 4.3 0.8 0.8 5.9 5.9 t2/ 

Proposed – Total Length 203.0 55.6 4.9 t2/ 2.0 2.1 3.9 64.4 2.0 66.4 3.9 

Proposed – Comparison portion for Alternatives 4A-4F 90.2 21.8 0.8 t2/ 0.8 0.8 0.5 23.0 0.8 23.9 1.3 

Alternative 4A 85.2 33.4 8.7 0.6 0.2 0.7 1.0 43.6 0.2 43.8 18.7 

Alternative 4B 100.2 29.2 1.1 0.3 0.3 5.8 36.4 36.4 15.2 

Alternative 4C 101.6 27.9 1.6 0.3 0.3 0.3 30.1 30.1 15.1 

Alternative 4D 100.8 29.3 1.1 0.3 0.3 2.5 33.3 33.3 15.1 

Alternative 4E 102.2 28.1 1.7 0.3 0.3 0.4 30.5 30.5 15.1 

Alternative 4F 87.5 27.2 1.4 0.4 0.8 1.3 1.0 30.1 0.8 30.9 17.9 

Total of Proposed Segments (grey shading) 62.5 6.1 t2/ 2.0 2.1 4.7 73.3 2.0 75.3 4.7 

Note: Due to permit criteria, acreages reported here are rounded to tenths of an acre; therefore, numbers are inexact and columns/rows may not sum exactly

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

24

Segment 

Number Proposed or Alternative Name

Segment 

Length 

(miles)

Forested Wetlands Total Wetlands 

Table D.9-3 Page 1 of 1
Gateway West Transmission Line Draft EIS

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

Proposed – Total Length 100.6 3.3 8.1 Proposed – Compare to Alternative 1E-A 17.6 Alternative 1E-A 16.1 Proposed – Compare to Alternative 1E-B 37.9 3.0 Alternative 1E-B 59.3 17.3 Proposed – Compare to Alternative 1E-C 75.4 3.3 8.1 Alternative 1E-C 48.7 5.4 1W(a) Proposed – Total Length 76.5 5.4 Proposed – Comparison portion for Alternative 1W-A 20.3 Alternative 1W-A 16.2 1W(c) Proposed – Total Length 70.6 5.4 Proposed – Total Length 96.7 18.4 Proposed – Compare to Alternative 2A 28.8 14.9 

Alternative 2A 28.4 0.2 

Proposed – Compare to Alternative 2B 7.0 Alternative 2B 6.2 Proposed – Compare to Alternative 2C 28.4 18.4 

Alternative 2C 24.4 

3 Proposed – Total Length 56.5 

Proposed – Total Length 203.0 6.42/ 57.9 

Proposed – Compare to Alternatives 4A-4F 90.2 6.4 41.8 Alternative 4A 85.2 8.2 17.4 Alternative 4B 100.2 34.1 Alternative 4C 101.6 35.5 

Alternative 4D 100.8 33.6 Alternative 4E 102.2 35.0 

Alternative 4F 87.5 8.2 12.5 Proposed – Total Length 54.6 Proposed – Compare to Alternatives 5A,B 25.3 Alternative 5A 33.7 Alternative 5B 44.4 Proposed – Compare to Alternative 5C 33.2 Alternative 5C 26.1 8.6 Proposed – Compare to Alternative 5D 19.4 Alternative 5D 17.5 Proposed – Compare to Alternative 5E 5.8 Alternative 5E 5.3 

6 Proposed – Total Length 0.5 

Note: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactly

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 4

4

1W

52

W

Bighorn Sheep 

Winter Range

Elk

Summer Range

Elk Calving 

Areas1/ 

Elk 

Winter Range

Segment Length 

Proposed or Alternative Name (Miles)

Segment 

Number

1E

Table D.10-1 Page 1 of 2
Gateway West Transmission Line Draft EIS

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

Proposed – Total Length 118.1 Proposed – Compare to Alternatives 7A,B 35.2 Alternative 7A 38.0 Alternative 7B 46.4 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 3.1 Alternative 7G 3.2 Proposed – Compare to Alternatives 7H,I 118.1 Alternative 7H 127.5 2.3 Alternative 7I 173.4 8.3 Proposed – Comparison portion 7/9 for Alternative 7J 3/ 143.9 Alternative 7J3/ 202.1 8.3 

Proposed – Total Length 131.0 15.6 Proposed – Compare to Alternative 8A 51.4 Alternative 8A 53.6 Proposed – Compare to Alternative 8B 45.3 4.1Alternative 8B 45.8 4.1Alternative 8B – Compare to Alternative 8C 6.5 4.1Alternative 8C 6.4 5.6Proposed – Compare to Alternative 8D 6.9Alternative 8D 8.1Proposed – Comparison portion for Alternative 8E 7.0Alternative 8E 18.5 1.5Proposed – Total Length 161.7 Proposed – Compare to Alternative 9A 7.8 Alternative 9A 7.7 Proposed – Compare to Alternative 9B 49.5Alternative 9B 53.2Proposed – Compare to Alternative 9C 14.7Alternative 9C 15.3Proposed – Comparison portion for Alternatives 9D-9H 57.2 Alternative 9D 58.4 1.5 Alternative 9E 68.7 13.8 Alternative 9F 62.9 1.5 Alternative 9G 56.4 1.7 Alternative 9H 61.0 1.7 

10 Proposed – Total Length 33.6 

Note: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactly

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

3/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for S

the corresponding portion of Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 

W

Proposed or Alternative Name 

Segment Length 

(Miles)

Bighorn Sheep 

Winter Range

Elk

Summer Range

Elk Calving 

Areas1/ 

Elk 

Winter Range

789

Segment 

Number

Table D.10-1 Page 2 of 2
Gateway West Transmission Line Draft EIS

American 

Kestrel Bald Eagle

Burrowing 

Owl

Common 

Raven

Ferruginous 

Hawk

Golden 

Eagle

North

Gosha

Proposed – Total Length 100.6 4 7 2 

Proposed – Comparison portion for Alternative 1E-A 17.6 

Alternative 1E-A 16.1 1 

Proposed – Comparison portion for Alternative 1E-B 37.9 4 6 

Alternative 1E-B 59.3 4 6 

Proposed – Comparison portion for Alternative 1E-C 75.4 4 7 2 

Alternative 1E-C 48.7 4 1 

1W(a) Proposed – Total Length 76.5 4 1 

Proposed – Comparison portion for Alternative 1W-A 20.3 

Alternative 1W-A 16.2 1 

1W(c) Proposed – Total Length 70.6 1 4 1 

Proposed – Total Length 96.7 2 3 79 19 

Proposed – Comparison portion for Alternative 2A 28.8 10 6 

Alternative 2A 28.4 1 2 6 4 

Proposed – Comparison portion for Alternative 2B 7.0 5 

Alternative 2B 6.2 2 1 

Proposed – Comparison portion for Alternative 2C 28.4 19 7 

Alternative 2C 24.4 2 19 10 

3 Proposed – Total Length 56.5 1 2 9 8 

Proposed – Total Length 203.0 1 1 5 13 4 4 Proposed – Comparison portion for Alternatives 4A-4F 90.2 1 4 

Alternative 4A 85.2 1 2 4 Alternative 4B 100.2 1 1 2 6 Alternative 4C 101.6 1 1 2 6 Alternative 4D 100.8 1 1 2 6 Alternative 4E 102.2 1 1 2 6 Alternative 4F 87.5 1 2 4 

Proposed – Total Length 54.6 2 1 

Proposed – Comparison portion for Alternatives 5A,B 25.3 

Alternative 5A 33.7 Alternative 5B 44.4 

Proposed – Comparison portion for Alternative 5C 33.2 

Alternative 5C 26.1 

Proposed – Comparison portion for Alternative 5D 19.4 2 

Alternative 5D 17.5 2 

Proposed – Comparison portion for Alternative 5E 5.8 2 

Alternative 5E 5.3 

6 Proposed – Total Length 0.5

Table D.10-2. Known Active Nests of Raptors and Birds of Prey within 1 mile of Project Centerline

Raptor and Birds of Prey N

4

1E

1W

Segment 

Number Proposed or Alternative Name

Segment 

Length 

(Miles)

25

Table D.10-2 Page 1 of 2
Gateway West Transmission Line Draft EIS

American 

Kestrel Bald Eagle

Burrowing 

Owl

Common 

Raven

Ferruginous 

Hawk

Golden 

Eagle

North

Gosha

Proposed – Total Length 118.1 3 9 

Proposed – Comparison portion for Alternatives 7A,B 35.2 

Alternative 7A 38.0 Alternative 7B 46.4 

Proposed – Comparison portion for Alternative 7C 20.1 2 2 

Alternative 7C 20.3 2 

Proposed – Comparison portion for Alternative 7D 6.2 1 

Alternative 7D 6.8 1 

Proposed – Comparison portion for Alternative 7E 3.8 7 

Alternative 7E 4.5 7 

Proposed – Comparison portion for Alternative 7F 10.5 7 

Alternative 7F 10.8 7 

Proposed – Comparison portion for Alternative 7G 3.1 

Alternative 7G 3.2 

Proposed – Comparison portion for Alternatives 7H,I 118.1 3 9 

Alternative 7H 127.5 1 48 Alternative 7I 173.4 1 58 3 

Proposed – Comparison portion 7/9 for Alternative 7J 1/ 143.9 3 2 27 

Alternative 7J1/ 202.1 1 2 75 3 

Proposed – Total Length 131.0 43 86 

Proposed – Comparison portion for Alternative 8A 51.4 1 

Alternative 8A 53.6 

Proposed – Comparison portion for Alternative 8B 45.3 42 69 

Alternative 8B 45.8 33 19 

Proposed – Comparison portion for Alternative 8C 6.5 12 

Alternative 8C 6.4 17 

Proposed – Comparison portion for Alternative 8D 6.9 14 36 

Alternative 8D 8.1 17 40 

Proposed – Comparison portion for Alternative 8E 7.0 19 3 

Alternative 8E 18.5 16 42 

Proposed – Total Length 161.7 9 3 43 

Proposed – Comparison portion for Alternative 9A 7.8 2 

Alternative 9A 7.7 2 

Proposed – Comparison portion for Alternative 9B 49.5 3 10 

Alternative 9B 53.2 1 4 

Proposed – Comparison portion for Alternative 9C 14.7 1 10 

Alternative 9C 15.3 1 4 

Proposed – Comparison portion for Alternatives 9D-9H 57.2 4 1 7 

Alternative 9D 58.4 99 52 Alternative 9E 68.7 3 10 Alternative 9F 62.9 96 57 Alternative 9G 56.4 93 37 Alternative 9H 61.0 90 42 

10 Proposed – Total Length 33.6 2 

Segment 

Number Proposed or Alternative Name

Segment 

Length 

(Miles)

Raptor and Birds of Prey N

89

1/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for S

corresponding portion of Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 7 o

Table D.10-2. Known Active Nests of Raptors and Birds of Prey within 1 mile of Project Centerline cont.

7

Table D.10-2 Page 2 of 2
Gateway West Transmission Line Draft EIS

Average Patch 

Size (Acre) Patch Count

Average Patch 

Size (Acre) Patch Count

Average Patch 

Size (Acre) 

Proposed – Total Length 100.6 803 137 353 501 394 Proposed – Comparison portion for Alternative 1E-A 17.6 691 6 238 141 267 Alternative 1E-A 16.1 456 11 274 108 273 Proposed – Comparison portion for Alternative 1E-B 37.9 951 25 393 187 545 Alternative 1E-B 59.3 888 69 328 279 449 Proposed – Comparison portion for Alternative 1E-C 75.4 821 128 391 367 497 Alternative 1E-C 48.7 693 65 278 247 500 1W(a) Proposed – Total Length 76.5 671 75 259 395 399 Proposed – Comparison portion for Alternative 1W-A 20.3 769 5 230 144 293 Alternative 1W-A 16.2 465 10 283 109 261 1W(c) Proposed – Total Length 70.6 633 84 274 363 394 Proposed – Total Length 96.7 456 1011 456 1011 332 Proposed – Comparison portion for Alternative 2A 28.8 329 457 329 457 260 Alternative 2A 28.4 309 486 309 486 260 Proposed – Comparison portion for Alternative 2B 7.0 443 119 443 119 260 Alternative 2B 6.2 414 115 414 115 260 Proposed – Comparison portion for Alternative 2C 28.4 315 490 315 490 102 Alternative 2C 24.4 345 408 345 408 102 

3 Proposed – Total Length 56.5 166 12 733 498

Proposed – Total Length 203.0 121 912 360 2122 18 Proposed – Comparison portion for Alternatives 4A-4F 90.2 807 67 586 655 26 Alternative 4A 85.2 293 43 627 638 25 Alternative 4B 100.2 7 10 617 763 13 Alternative 4C 101.6 7 10 635 739 12 Alternative 4D 100.8 7 10 616 766 13 Alternative 4E 102.2 7 10 634 742 12 Alternative 4F 87.5 433 58 589 678 26 Proposed – Total Length 54.6 52 626 117 1006 21 Proposed – Comparison portion for Alternatives 5A,B 25.3 62 430 147 489 18 Alternative 5A 33.7 58 567 153 594 24 Alternative 5B 44.4 39 715 184 699 22 Proposed – Comparison portion for Alternative 5C 33.2 57 543 143 590 19 Alternative 5C 26.1 20 561 146 627 24 Proposed – Comparison portion for Alternative 5D 19.4 67 252 117 381 18 Alternative 5D 17.5 66 224 102 375 18 Proposed – Comparison portion for Alternative 5E 5.8 13 72 117 161 16 Alternative 5E 5.3 13 72 119 158 16 

6 Proposed – Total Length 0.5

Segment Forest Woodlands Shrublands

Length 

(Miles)

Pre-Construct

Proposed or Alternative Name

Grass

1E

1W

45

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

2

Segment 

Number

Table D.10-3a Page 1 of 4
Gateway West Transmission Line Draft EIS

Average Patch 

Size (Acre) Patch Count

Average Patch 

Size (Acre) Patch Count

Average Patch 

Size (Acre) 

Proposed – Total Length 118.1 37 1089 103 1962 45 Proposed – Comparison portion for Alternatives 7A,B 35.2 46 627 144 687 23 Alternative 7A 38.0 36 820 165 710 24 Alternative 7B 46.4 22 929 201 751 22 Proposed – Comparison portion for Alternative 7C 20.1 16 170 66 592 85 Alternative 7C 20.3 15 184 81 439 82 Proposed – Comparison portion for Alternative 7D 6.2 31 102 83 276 58 Alternative 7D 6.8 31 102 81 285 58 Proposed – Comparison portion for Alternative 7E 3.8 22 89 170 100 20 Alternative 7E 4.5 23 93 150 119 22 Proposed – Comparison portion for Alternative 7F 10.5 32 137 146 175 25 Alternative 7F 10.8 33 148 147 190 25 Proposed – Comparison portion for Alternative 7G 3.1 20 138 247 79 13 Alternative 7G 3.2 20 134 254 76 14 Proposed – Comparison portion for Alternatives 7H,I 118.1 37 1089 103 1962 45 Alternative 7H 127.5 35 1921 154 2175 38 Alternative 7I 173.4 23 2194 205 2734 42 Proposed – Comparison portion 7/9 for Alternative 7J 1/ 143.9 33 1215 79 3181 38 

Alternative 7J1/ 202.1 22 2229 180 3634 37 

Proposed – Total Length 131.0 61 5022 38 Proposed – Comparison portion for Alternative 8A 51.4 61 1685 47 Alternative 8A 53.6 41 1966 50 Proposed – Comparison portion for Alternative 8B 45.3 54 2360 33 Alternative 8B 45.8 51 1754 39 Proposed – Comparison portion for Alternative 8C 6.5 70 461 41 Alternative 8C 6.4 68 474 42 Proposed – Comparison portion for Alternative 8D 6.9 37 857 37 Alternative 8D 8.1 37 880 40 Proposed – Comparison portion for Alternative 8E 7.0 40 704 36 Alternative 8E 18.5 41 1209 37 Proposed – Total Length 161.7 15 101 57 5993 42 Proposed – Comparison portion for Alternative 9A 7.8 9 13 71 282 43 Alternative 9A 7.7 9 13 74 293 43 Proposed – Comparison portion for Alternative 9B 49.5 71 1715 51 Alternative 9B 53.2 51 2042 43 Proposed – Comparison portion for Alternative 9C 14.7 167 375 20 Alternative 9C 15.3 160 367 15 Proposed – Comparison portion for Alternatives 9D-9H 57.2 43 2793 41 Alternative 9D 58.4 35 3614 33 Alternative 9E 68.7 25 81 94 2340 39 Alternative 9F 62.9 36 3615 35 Alternative 9G 56.4 36 3389 34 Alternative 9H 61.0 36 3487 36 

10 Proposed – Total Length 33.6 16 66 38 722 99 

1/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for S

Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 7 of the Proposed Route (11

Segment 

Length 

(Miles)

Pre-Construct

Forest Woodlands Shrublands Grass

9

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

Segment 

Number Proposed or Alternative Name

87

Table D.10-3a Page 2 of 4
Gateway West Transmission Line Draft EIS

Average Patch 

Size (Acre) Patch Count

Average Patch 

Size (Acre) Patch Count

Average Patch 

Size (Acre) 

Proposed – Total Length 100.6 706 156 321 551 364 Proposed – Comparison portion for Alternative 1E-A 17.6 691 6 225 149 242 Alternative 1E-A 16.1 456 11 255 116 246 Proposed – Comparison portion for Alternative 1E-B 37.9 820 29 350 210 526 Alternative 1E-B 59.3 786 78 310 295 419 Proposed – Comparison portion for Alternative 1E-C 75.4 715 147 351 409 464 Alternative 1E-C 48.7 601 75 244 282 442 1W(a) Proposed – Total Length 76.5 592 85 233 438 360 Proposed – Comparison portion for Alternative 1W-A 20.3 769 5 218 152 268 Alternative 1W-A 16.2 465 10 264 117 236 1W(c) Proposed – Total Length 70.6 565 94 245 405 352 Proposed – Total Length 96.7 438 1052 298 Proposed – Comparison portion for Alternative 2A 28.8 314 480 260 Alternative 2A 28.4 295 509 260 Proposed – Comparison portion for Alternative 2B 7.0 393 134 260 Alternative 2B 6.2 366 130 260 Proposed – Comparison portion for Alternative 2C 28.4 306 505 102 Alternative 2C 24.4 336 419 102 

3 Proposed – Total Length 56.5 166 12 677 529

Proposed – Total Length 203.0 116 949 342 2234 17 Proposed – Comparison portion for Alternatives 4A-4F 90.2 795 68 544 705 26 Alternative 4A 85.2 273 46 597 670 25 Alternative 4B 100.2 7 10 580 811 12 Alternative 4C 101.6 7 10 593 792 12 Alternative 4D 100.8 7 10 580 814 12 Alternative 4E 102.2 7 10 592 795 12 Alternative 4F 87.5 419 60 562 710 26 Proposed – Total Length 54.6 48 675 107 1104 20 Proposed – Comparison portion for Alternatives 5A,B 25.3 56 474 129 555 17 Alternative 5A 33.7 51 645 131 695 22 Alternative 5B 44.4 35 797 159 809 20 Proposed – Comparison portion for Alternative 5C 33.2 52 587 126 671 18 Alternative 5C 26.1 20 576 133 688 23 Proposed – Comparison portion for Alternative 5D 19.4 62 272 104 427 17 Alternative 5D 17.5 61 244 92 419 17 Proposed – Comparison portion for Alternative 5E 5.8 13 73 106 178 15 Alternative 5E 5.3 13 73 108 174 15 

6 Proposed – Total Length 0.5

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

1W

Grass

Segment/Alternative Name

Segment 

Length 

(Miles)

1E

Forest Woodlands

Post-Construc

Segment 

Number

45

Shrublands

2

Table D.10-3a Page 3 of 4
Gateway West Transmission Line Draft EIS

Average Patch 

Size (Acre) Patch Count

Average Patch 

Size (Acre) Patch Count

Average Patch 

Size (Acre) 

Proposed – Total Length 118.1 34 1162 95 2131 43 Proposed – Comparison portion for Alternatives 7A,B 35.2 42 680 127 779 22 Alternative 7A 38.0 33 895 144 815 22 Alternative 7B 46.4 20 990 178 845 21 Proposed – Comparison portion for Alternative 7C 20.1 15 175 63 622 83 Alternative 7C 20.3 15 189 76 469 79 Proposed – Comparison portion for Alternative 7D 6.2 30 105 74 310 53 Alternative 7D 6.8 30 105 72 319 53 Proposed – Comparison portion for Alternative 7E 3.8 20 99 129 131 17 Alternative 7E 4.5 20 103 119 150 19 Proposed – Comparison portion for Alternative 7F 10.5 30 147 124 207 22 Alternative 7F 10.8 31 158 126 222 23 Proposed – Comparison portion for Alternative 7G 3.1 19 141 229 85 13 Alternative 7G 3.2 20 137 235 82 13 Proposed – Comparison portion for Alternatives 7H,I 118.1 34 1162 95 2131 43 Alternative 7H 127.5 34 2000 144 2337 36 Alternative 7I 173.4 22 2283 192 2930 39 Proposed – Comparison portion 7/9 for Alternative 7J 1/ 143.9 32 1244 77 3297 37 

Alternative 7J1/ 202.1 22 2319 168 3900 35 Proposed – Total Length 131.0 58 5254 36 Proposed – Comparison portion for Alternative 8A 51.4 58 1760 45 Alternative 8A 53.6 39 2072 47 Proposed – Comparison portion for Alternative 8B 45.3 51 2479 31 Alternative 8B 45.8 49 1827 37 Proposed – Comparison portion for Alternative 8C 6.5 64 499 39 Alternative 8C 6.4 63 512 40 Proposed – Comparison portion for Alternative 8D 6.9 36 887 35 Alternative 8D 8.1 35 912 38 Proposed – Comparison portion for Alternative 8E 7.0 38 736 34 Alternative 8E 18.5 39 1264 35 Proposed – Total Length 161.7 15 101 54 6307 40 Proposed – Comparison portion for Alternative 9A 7.8 9 13 67 297 41 Alternative 9A 7.7 9 13 71 308 42 Proposed – Comparison portion for Alternative 9B 49.5 67 1816 49 Alternative 9B 53.2 48 2177 41 Proposed – Comparison portion for Alternative 9C 14.7 155 404 20 Alternative 9C 15.3 148 397 15 Proposed – Comparison portion for Alternatives 9D-9H 57.2 41 2913 39 Alternative 9D 58.4 34 3734 32 Alternative 9E 68.7 25 81 88 2498 37 Alternative 9F 62.9 34 3732 34 Alternative 9G 56.4 35 3502 32 Alternative 9H 61.0 35 3601 34 

10 Proposed – Total Length 33.6 16 66 37 742 94 

1/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for S

Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 7 of the Proposed Route (11

Segment 

Number Segment/Alternative Name

Segment 

Length 

(Miles)

Post-Construc

Forest Woodlands Shrublands Grass

987

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

Table D.10-3a Page 4 of 4
Gateway West Transmission Line Draft EIS

Change in 

Average Patch 

Size (Acre)

Change in 

Patch Count

Change in 

Average Patch 

Size (Acre)

Change in 

Patch Count

Change 

Average P

Size (Acr

Proposed – Total Length 100.6 -98 19 -32 50 -30 Proposed – Comparison portion for Alternative 1E-A 17.6 t1/ -13 8 -26 

Alternative 1E-A 16.1 t1/ -19 8 -27 Proposed – Comparison portion for Alternative 1E-B 37.9 -131 4 -43 23 -19 Alternative 1E-B 59.3 -102 9 -18 16 -30 Proposed – Comparison portion for Alternative 1E-C 75.4 -106 19 -40 42 -32 Alternative 1E-C 48.7 -92 10 -35 35 -58 1W(a) Proposed – Total Length 76.5 -79 10 -25 43 -40 Proposed – Comparison portion for Alternative 1W-A 20.3 t1/ -12 8 -25 Alternative 1W-A 16.2 t1/ -19 8 -25 1W(c) Proposed – Total Length 70.6 -67 10 -28 42 -43 Proposed – Total Length 96.7 -18 41 -34 Proposed – Comparison portion for Alternative 2A 28.8 -16 23 Alternative 2A 28.4 -14 23 Proposed – Comparison portion for Alternative 2B 7.0 -50 15 Alternative 2B 6.2 -48 15 Proposed – Comparison portion for Alternative 2C 28.4 -9 15 Alternative 2C 24.4 -9 11 

3 Proposed – Total Length 56.5 -56 31

Proposed – Total Length 203.0 -5 37 -18 112 < -1 Proposed – Comparison portion for Alternatives 4A-4F 90.2 -12 1 -42 50 < -1 Alternative 4A 85.2 -19 3 -30 32 < -1 Alternative 4B 100.2 -37 48 t1/ 

Alternative 4C 101.6 -43 53 t1/ Alternative 4D 100.8 -36 48 t1/ Alternative 4E 102.2 -42 53 t1/ Alternative 4F 87.5 -14 2 -27 32 < -1 Proposed –Total Length 54.6 -4 49 -10 98 -1 Proposed – Comparison portion for Alternatives 5A,B 25.3 -6 44 -17 66 -1 Alternative 5A 33.7 -7 78 -22 101 -2 Alternative 5B 44.4 -4 82 -25 110 -2 Proposed – Comparison portion for Alternative 5C 33.2 -4 44 -17 81 -1 Alternative 5C 26.1 -1 15 -13 61 -1 Proposed – Comparison portion for Alternative 5D 19.4 -5 20 -13 46 -1 Alternative 5D 17.5 -5 20 -11 44 -1 Proposed – Comparison portion for Alternative 5E 5.8 < -1 1 -11 17 -1 Alternative 5E 5.3 < -1 1 -11 16 -1 

6 Proposed –Total Length 0.5

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

Note: 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

1E

1W

Forest Woodlands Shrublands G

Segment 

Length 

(Miles)

Segment 

Number Proposed or Alternative Name

245

Table D.10-3b Page 1 of 2
Gateway West Transmission Line Draft EIS

Change in 

Average Patch 

Size (Acre)

Change in 

Patch Count

Change in 

Average Patch 

Size (Acre)

Change in 

Patch Count

Change 

Average P

Size (Acr

Proposed –Total Length 118.1 -2 73 -8 169 -2 Proposed – Comparison portion for Alternatives 7A,B 35.2 -4 53 -17 92 -1 Alternative 7A 38.0 -3 75 -21 105 -2 Alternative 7B 46.4 -1 61 -22 94 -1 Proposed – Comparison portion for Alternative 7C 20.1 < -1 5 -3 30 -2 Alternative 7C 20.3 < -1 5 -5 30 -3 Proposed – Comparison portion for Alternative 7D 6.2 -1 3 -9 34 -5 Alternative 7D 6.8 -1 3 -9 34 -5 Proposed – Comparison portion for Alternative 7E 3.8 -2 10 -40 31 -3 Alternative 7E 4.5 -2 10 -31 31 -3 Proposed – Comparison portion for Alternative 7F 10.5 -2 10 -23 32 -3 Alternative 7F 10.8 -2 10 -21 32 -3 Proposed – Comparison portion for Alternative 7G 3.1 < -1 3 -17 6 -1 Alternative 7G 3.2 < -1 3 -19 6 -1 Proposed – Comparison portion for Alternatives 7H,I 118.1 -2 73 -8 169 -2 Alternative 7H 127.5 -1 79 -11 162 -2 Alternative 7I 173.4 -1 89 -14 196 -2 Proposed – Comparison portion 7/9 for Alternative 7J 2/ 143.9 -1 29 -3 116 -1 

Alternative 7J2/ 202.1 -1 90 -12 266 -2 

Proposed –Total Length 131.0 -3 232 -2 Proposed – Comparison portion for Alternative 8A 51.4 -3 75 -2 Alternative 8A 53.6 -2 106 -3 Proposed – Comparison portion for Alternative 8B 45.3 -3 119 -1 Alternative 8B 45.8 -2 73 -1 Proposed – Comparison portion for Alternative 8C 6.5 -5 38 -2 Alternative 8C 6.4 -5 38 -2 Proposed – Comparison portion for Alternative 8D 6.9 -1 30 -2 Alternative 8D 8.1 -1 32 -2 Proposed – Comparison portion for Alternative 8E 7.0 -2 32 -2 Alternative 8E 18.5 -2 55 -2 Proposed –Total Length 161.7 -3 314 -2 Proposed – Comparison portion for Alternative 9A 7.8 -4 15 -2 Alternative 9A 7.7 -4 15 -2 Proposed – Comparison portion for Alternative 9B 49.5 -4 101 -2 Alternative 9B 53.2 -3 135 -2 Proposed – Comparison portion for Alternative 9C 14.7 -12 29 < -1 Alternative 9C 15.3 -12 30 < -1 Proposed – Comparison portion for Alternatives 9D-9H 57.2 -2 120 -2 Alternative 9-D 58.4 -1 120 -1 Alternative 9-E 68.7 -6 158 -2 Alternative 9F 62.9 -1 117 -1 Alternative 9G 56.4 -1 113 -1 Alternative 9H 61.0 -1 114 -1 

10 Proposed –Total Length 33.6 -1 20 -5 

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

2/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for S

Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 7 of the Proposed Route (11Note: 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 cont.

Segment 

Number Proposed or Alternative Name

Segment 

Length 

(Miles)

Forest Woodlands Shrublands G

789

Table D.10-3b Page 2 of 2
Gateway West Transmission Line Draft 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 Patch 

Size (Acre) P

Proposed – Total Length 100.6 10006 11 2949 60 3041 Proposed – Comparison portion for Alternative 1E-A 17.6 829 5 906 37 1285 Alternative 1E-A 16.1 717 7 779 38 1309 Proposed – Comparison portion for Alternative 1E-B 37.9 11893 2 5655 13 9394 Alternative 1E-B 59.3 7659 8 3663 25 6355 Proposed – Comparison portion for Alternative 1E-C 75.4 13138 8 5313 27 5829 Alternative 1E-C 48.7 5006 9 1762 39 6705 1W(a) Proposed – Total Length 76.5 3873 13 1382 74 3063 Proposed – Comparison portion for Alternative 1W-A 20.3 962 4 873 38 1534 Alternative 1W-A 16.2 775 6 834 37 1225 1W(c) Proposed – Total Length 70.6 4088 13 1381 72 3024 Proposed – Total Length 96.7 9406 49 775 Proposed – Comparison portion for Alternative 2A 28.8 4426 34 781 Alternative 2A 28.4 4423 34 781 Proposed – Comparison portion for Alternative 2B 7.0 2292 23 781 Alternative 2B 6.2 2070 23 781 Proposed – Comparison portion for Alternative 2C 28.4 8577 18 204 Alternative 2C 24.4 12792 11 204 

3 Proposed – Total Length 56.5 183 11 16459 24

Proposed – Total Length 203.0 148 746 822 929 21 Proposed – Comparison portion for Alternatives 4A-4F 90.2 3182 17 4798 80 30 Alternative 4A 85.2 466 27 4042 99 29 Alternative 4B 100.2 9 8 4484 105 13 Alternative 4C 101.6 9 8 4515 104 12 Alternative 4D 100.8 9 8 4495 105 13 Alternative 4E 102.2 9 8 4526 104 12 Alternative 4F 87.5 1092 23 4339 92 30 Proposed – Total Length 54.6 58 561 151 777 25 Proposed – Comparison portion for Alternatives 5A,B 25.3 68 390 179 401 22 Alternative 5A 33.7 67 497 201 454 30 Alternative 5B 44.4 43 653 255 506 28 Proposed – Comparison portion for Alternative 5C 33.2 65 470 182 464 23 Alternative 5C 26.1 22 516 182 502 27 Proposed – Comparison portion for Alternative 5D 19.4 82 205 144 308 19 Alternative 5D 17.5 83 178 131 294 20 Proposed – Comparison portion for Alternative 5E 5.8 15 66 114 166 15 Alternative 5E 5.3 15 66 112 167 15 

6 Proposed – Total Length 0.55

Segment 

Length 

(Miles)

Segment 

Number

42

Proposed or Alternative Name

1E

1W

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

Forest Woodlands

Pre-Constructio

Shrublands Grasslan

Table D.10-4a Page 1 of 4
Gateway West Transmission Line Draft 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 Patch 

Size (Acre) P

Proposed – Total Length 118.1 40 996 148 1374 60 Proposed – Comparison portion for Alternatives 7A,B 35.2 51 567 191 518 30 Alternative 7A 38.0 41 719 238 492 31 Alternative 7B 46.4 24 846 297 508 28 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 33 132 207 124 28 Alternative 7F 10.8 34 141 212 132 29 Proposed – Comparison portion for Alternative 7G 3.1 22 126 673 29 19 Alternative 7G 3.2 22 122 689 28 20 Proposed – Comparison portion for Alternatives 7H,I 118.1 40 996 148 1374 60 Alternative 7H 127.5 42 1639 271 1236 55 Alternative 7I 173.4 26 1938 383 1466 63 Proposed – Comparison portion 7/9 for Alternative 7J 1/ 143.9 39 1022 148 1714 62 

Alternative 7J1/ 202.1 26 1903 382 1716 59 Proposed – Total Length 131.0 97 3164 55 Proposed – Comparison portion for Alternative 8A 51.4 81 1265 62 Alternative 8A 53.6 55 1459 68 Proposed – Comparison portion for Alternative 8B 45.3 110 1158 60 Alternative 8B 45.8 91 985 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 8.1 100 324 154 Proposed – Comparison portion for Alternative 8E 7.0 88 318 83 Alternative 8E 18.5 96 519 80 Proposed – Total Length 161.7 17 89 112 3044 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 49.5 140 871 90 Alternative 9B 53.2 88 1186 75 Proposed – Comparison portion for Alternative 9C 14.7 544 115 31 Alternative 9C 15.3 528 111 24 Proposed – Comparison portion for Alternatives 9D-9H 57.2 79 1532 87 Alternative 9D 58.4 76 1662 73 Alternative 9E 68.7 26 80 160 1379 59 Alternative 9F 62.9 73 1771 78 Alternative 9G 56.4 75 1620 74 Alternative 9H 61.0 72 1727 80 

10 Proposed – Total Length 33.6 18 60 47 582 138 

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

1/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for S

of Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 7 of the Proposed Route (

9

Forest Woodlands Shrublands Grasslan

Proposed or Alternative Name

Segment 

Length 

(Miles)

Pre-Constructio

Segment 

Number

78

Table D.10-4a Page 2 of 4
Gateway West Transmission Line Draft EIS

Average Patch 

Size (Acre) Patch Count

Average Patch 

Size (Acre) Patch Count

Average Pat

Size (Acre

Proposed – Total Length 100.6 2822 39 1525 116 1444 Proposed – Comparison portion for Alternative 1E-A 17.6 345 12 559 60 649 Alternative 1E-A 16.1 359 14 485 61 661 Proposed – Comparison portion for Alternative 1E-B 37.9 2643 9 2228 33 4697 Alternative 1E-B 59.3 3225 19 2081 44 4030 Proposed – Comparison portion for Alternative 1E-C 75.4 3185 33 2277 63 2623 Alternative 1E-C 48.7 2145 21 1090 63 2476 1W(a) Proposed – Total Length 76.5 1798 28 867 118 1467 Proposed – Comparison portion for Alternative 1W-A 20.3 385 10 553 60 815 Alternative 1W-A 16.2 387 12 523 59 636 1W(c) Proposed – Total Length 70.6 1898 28 864 115 1361 Proposed – Total Length 96.7 5065 91 554 Proposed – Comparison portion for Alternative 2A 28.8 2280 66 781 Alternative 2A 28.4 2211 68 781 Proposed – Comparison portion for Alternative 2B 7.0 1146 46 781 Alternative 2B 6.2 1035 46 781 Proposed – Comparison portion for Alternative 2C 28.4 4825 32 204 Alternative 2C 24.4 7036 20 204 

3 Proposed – Total Length 56.5 183 11 5895 60

Proposed – Total Length 203.0 142 780 736 1037 20 Proposed – Comparison portion for Alternatives 4A-4F 90.2 2163 25 3172 121 30 Alternative 4A 85.2 381 33 2779 144 29 Alternative 4B 100.2 9 8 3363 140 13 Alternative 4C 101.6 9 8 3283 143 12 Alternative 4D 100.8 9 8 3371 140 13 Alternative 4E 102.2 9 8 3292 143 12 Alternative 4F 87.5 811 31 2872 139 30 Proposed – Total Length 54.6 52 626 126 937 24 Proposed – Comparison portion for Alternatives 5A,B 27.1 60 440 145 495 20 Alternative 5A 34.6 58 567 156 585 26 Alternative 5B 45.3 38 732 197 654 25 Proposed – Comparison portion for Alternative 5C 33.2 58 527 146 579 21 Alternative 5C 26.1 21 544 157 584 25 Proposed – Comparison portion for Alternative 5D 19.4 72 236 116 384 18 Alternative 5D 17.5 71 208 104 368 19 Proposed – Comparison portion for Alternative 5E 5.8 13 73 95 200 14 Alternative 5E 5.3 13 73 94 200 14 

6 Proposed – Total Length 0.5

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

5

1E

1W

2

Segment 

Length (Miles)

4

Segment 

Number Proposed or Alternative Name

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

Post-Const

Forest Woodlands Shrublands G

Table D.10-4a Page 3 of 4
Gateway West Transmission Line Draft EIS

Average Patch 

Size (Acre) Patch Count

Average Patch 

Size (Acre) Patch Count

Average Pat

Size (Acre

Proposed – Total Length 117.9 37 1089 125 1627 55 Proposed – Comparison portion for Alternatives 7A,B 38.8 46 624 155 638 28 Alternative 7A 41.5 38 780 191 614 28 Alternative 7B 50.1 22 903 239 632 25 Proposed – Comparison portion for Alternative 7C 20.1 17 155 85 460 106 Alternative 7C 20.3 17 168 93 384 93 Proposed – Comparison portion for Alternative 7D 6.2 29 109 90 255 54 Alternative 7D 6.8 29 109 88 261 54 Proposed – Comparison portion for Alternative 7E 3.8 19 103 150 113 19 Alternative 7E 4.5 20 107 144 124 21 Proposed – Comparison portion for Alternative 7F 10.5 29 151 151 170 24 Alternative 7F 10.8 30 160 157 178 25 Proposed – Comparison portion for Alternative 7G 3.1 20 134 342 57 15 Alternative 7G 3.2 21 130 344 56 15 Proposed – Comparison portion for Alternatives 7H,I 117.9 37 1089 125 1627 55 Alternative 7H 127.4 39 1732 227 1475 49 Alternative 7I 173.3 25 2034 326 1721 57 Proposed – Comparison portion 7/9 for Alternative 7J 1/ 143.9 38 1056 136 1865 59 

Alternative 7J1/ 202.1 25 1999 325 2014 53 Proposed – Total Length 131.0 89 3456 51 Proposed – Comparison portion for Alternative 8A 51.4 76 1360 57 Alternative 8A 53.6 51 1583 62 Proposed – Comparison portion for Alternative 8B 45.3 97 1310 54 Alternative 8B 45.8 84 1073 62 Proposed – Comparison portion for Alternative 8C 6.5 68 476 38 Alternative 8C 6.4 66 489 40 Proposed – Comparison portion for Alternative 8D 6.9 94 341 118 Alternative 8D 8.1 89 362 130 Proposed – Comparison portion for Alternative 8E 7 78 358 72 Alternative 8E 18.5 82 608 69 Proposed – Total Length 161.7 17 93 99 3444 72 Proposed – Comparison portion for Alternative 9A 7.8 9 13 115 174 70 Alternative 9A 7.7 9 13 119 184 71 Proposed – Comparison portion for Alternative 9B 49.5 123 988 84 Alternative 9B 53.2 78 1343 68 Proposed – Comparison portion for Alternative 9C 14.7 409 153 30 Alternative 9C 15.3 391 150 23 Proposed – Comparison portion for Alternatives 9D-9H 57.2 72 1671 78 Alternative 9D 58.2 67 1867 65 Alternative 9E 68.7 26 80 143 1539 54 Alternative 9F 62.9 65 1974 70 Alternative 9G 56.4 67 1815 66 Alternative 9H 61 65 1922 71 

10 Proposed – Total Length 33.6 17 64 43 628 120 

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

1/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for S

Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 7 of the Proposed Route (11

9

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

Segment 

Number Proposed or Alternative Name

Segment 

Length (Miles)

Post-Const

Forest Woodlands Shrublands G

87

Table D.10-4a Page 4 of 4
Gateway West Transmission Line Draft EIS

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

Change in 

Average Patch 

Size (Acre)

Change in 

Patch Count

Change in 

Average Patch 

Size (Acre)

Change in 

Patch Count

Change in 

Average Patch 

Size (Acre)

Proposed – Total Length 100.6 -7184 28 -1424 56 -1598 Proposed – Comparison portion for Alternative 1E-A 17.6 -484 7 -347 23 -636 Alternative 1E-A 16.1 -359 7 -294 23 -648 Proposed – Comparison portion for Alternative 1E-B 37.9 -9250 7 -3427 20 -4697 Alternative 1E-B 59.3 -4434 11 -1582 19 -2325 Proposed – Comparison portion for Alternative 1E-C 75.4 -9953 25 -3036 36 -3206 Alternative 1E-C 48.7 -2860 12 -671 24 -4229 1W(a) Proposed – Total Length 76.5 -2075 15 -515 44 -1597 Proposed – Comparison portion for Alternative 1W-A 20.3 -577 6 -320 22 -719 Alternative 1W-A 16.2 -387 6 -311 22 -588 1W(c) Proposed – Total Length 70.6 -2190 15 -516 43 -1663 Proposed – Total Length 96.7 -4341 42 -221 Proposed – Comparison portion for Alternative 2A 28.8 -2146 32 Alternative 2A 28.4 -2211 34 Proposed – Comparison portion for Alternative 2B 7.0 -1146 23 Alternative 2B 6.2 -1035 23 Proposed – Comparison portion for Alternative 2C 28.4 -3753 14 Alternative 2C 24.4 -5757 9

3 Proposed – Total Length 56.5 -10564 36

Proposed – Total Length 203.0 -6 34 -86 108 < -1 Proposed – Comparison portion for Alternatives 4A-4F 90.2 -1018 8 -1626 41 < -1 Alternative 4A 85.2 -85 6 -1263 45 < -1 Alternative 4B 100.2 -1121 35 < -1 Alternative 4C 101.6 -1231 39 < -1 Alternative 4D 100.8 -1124 35 < -1 Alternative 4E 102.2 -1234 39 < -1 Alternative 4F 87.5 -282 8 -1467 47 < -1 Proposed – Total Length 54.6 -6 65 -26 160 -2 Proposed – Comparison portion for Alternatives 5A,B 25.3 -8 50 -34 94 -1 Alternative 5A 33.7 -8 70 -45 131 -4 Alternative 5B 44.4 -5 79 -58 148 -3 Proposed – Comparison portion for Alternative 5C 33.2 -7 57 -36 115 -2 Alternative 5C 26.1 -1 28 -26 82 -2 Proposed – Comparison portion for Alternative 5D 19.4 -11 31 -29 76 -1 Alternative 5D 17.5 -12 30 -26 74 -1 Proposed – Comparison portion for Alternative 5E 5.8 -1 7 -19 34 < -1 Alternative 5E 5.3 -1 7 -19 33 < -1 

6 Proposed – Total Length 0.5

Note: 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

1E

1W

Forest Woodlands Shrublands Gras

245

Table D.10-4b Page 1 of 2
Gateway West Transmission Line Draft EIS

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

Change in 

Average Patch 

Size (Acre)

Change in 

Patch Count

Change in 

Average Patch 

Size (Acre)

Change in 

Patch Count

Change in 

Average Patch 

Size (Acre)

Proposed – Total Length 118.1 -3 93 -23 253 -5 Proposed – Comparison portion for Alternatives 7A,B 35.2 -5 57 -36 120 -2 Alternative 7A 38.0 -3 61 -47 122 -3 Alternative 7B 46.4 -2 57 -58 124 -2 Proposed – Comparison portion for Alternative 7C 20.1 < -1 4 -7 33 -6 Alternative 7C 20.3 < -1 4 -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 -96 44 -4 Alternative 7E 4.5 -4 19 -79 44 -4 Proposed – Comparison portion for Alternative 7F 10.5 -4 19 -56 46 -4 Alternative 7F 10.8 -4 19 -55 46 -4 Proposed – Comparison portion for Alternative 7G 3.1 -1 8 -330 28 -4 Alternative 7G 3.2 -1 8 -344 28 -4 Proposed – Comparison portion for Alternatives 7H,I 118.1 -3 93 -23 253 -5 Alternative 7H 127.5 -2 93 -44 239 -6 Alternative 7I 173.4 -1 96 -57 255 -6 Proposed – Comparison portion 7/9 for Alternative 7J 1/ 143.9 -1 34 -12 151 -3 

Alternative 7J1/ 202.1 -1 96 -56 298 -5 

Proposed – Total Length 131.0 -8 292 -4 Proposed – Comparison portion for Alternative 8A 51.4 -6 95 -5 Alternative 8A 53.6 -4 124 -6 Proposed – Comparison portion for Alternative 8B 45.3 -13 152 -6 Alternative 8B 45.8 -7 88 -6 Proposed – Comparison portion for Alternative 8C 6.5 -6 38 -3 Alternative 8C 6.4 -6 38 -3 Proposed – Comparison portion for Alternative 8D 6.9 -11 36 -20 Alternative 8D 8.1 -10 38 -24 Proposed – Comparison portion for Alternative 8E 7.0 -10 40 -12 Alternative 8E 18.5 -14 89 -11 Proposed – Total Length 161.7 < -1 4 -13 400 -8 Proposed – Comparison portion for Alternative 9A 7.8 -27 33 -10 Alternative 9A 7.7 -28 35 -11 Proposed – Comparison portion for Alternative 9B 49.5 -17 117 -6 Alternative 9B 53.2 -10 157 -7 Proposed – Comparison portion for Alternative 9C 14.7 -135 38 -1 Alternative 9C 15.3 -137 39 -1 Proposed – Comparison portion for Alternatives 9D-9H 57.2 -7 139 -9 Alternative 9D 58.4 -8 205 -8 Alternative 9E 68.7 -17 160 -5 Alternative 9F 62.9 -7 203 -9 Alternative 9G 56.4 -8 195 -8 Alternative 9H 61.0 -7 195 -9 

10 Proposed – Total Length 33.6 -1 4 -3 46 -17 

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

1/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for S

Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 7 of the Proposed Route (11

Segment 

Number

789

Proposed or Alternative Name

Forest Woodlands Shrublands Gras

Table D.10-4b Page 2 of 2
Gateway West Transmission Line Draft 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) 

Proposed – Total Length 100.6 744 148 293 603 305 Proposed – Comparison portion for Alternative 1E-A 17.6 414 10 160 209 175 Alternative 1E-A 16.1 335 15 180 164 177 Proposed – Comparison portion for Alternative 1E-B 37.9 951 25 364 202 513 Alternative 1E-B 59.3 888 69 291 315 414 Proposed – Comparison portion for Alternative 1E-C 75.4 779 135 357 402 443 Alternative 1E-C 48.7 617 73 214 321 422 1W(a) Proposed – Total Length 76.5 579 87 191 536 306 Proposed – Comparison portion for Alternative 1W-A 20.3 427 9 156 212 200 Alternative 1W-A 16.2 332 14 187 165 171 1W(c) Proposed – Total Length 70.6 554 96 205 486 296 Proposed – Total Length 96.7 356 1294 208 Proposed – Comparison portion for Alternative 2A 28.8 235 641 260 Alternative 2A 28.4 223 675 260 Proposed – Comparison portion for Alternative 2B 7.0 258 204 260 Alternative 2B 6.2 244 195 260 Proposed – Comparison portion for Alternative 2C 28.4 245 631 61 Alternative 2C 24.4 276 510 61 

3 Proposed – Total Length 56.4 153 13 506 655

Proposed – Total Length 203.0 108 1019 273 2792 16 Proposed – Comparison portion for Alternatives 4A-4F 90.2 784 69 432 888 25 Alternative 4A 85.2 197 64 401 997 24 Alternative 4B 100.2 6 11 445 1057 12 Alternative 4C 101.6 6 11 445 1055 11 Alternative 4D 100.8 6 11 445 1060 12 Alternative 4E 102.2 6 11 445 1058 11 Alternative 4F 87.5 344 73 394 1013 25 Proposed – Total Length 54.6 51 647 93 1266 18 Proposed – Comparison portion for Alternatives 5A,B 25.3 59 446 124 579 16 Alternative 5A 33.7 57 583 141 646 23 Alternative 5B 44.4 37 745 166 774 21 Proposed – Comparison portion for Alternative 5C 33.2 56 551 120 705 17 Alternative 5C 26.1 19 590 107 852 20 Proposed – Comparison portion for Alternative 5D 19.4 66 257 87 510 15 Alternative 5D 17.5 66 225 80 480 15 Proposed – Comparison portion for Alternative 5E 5.8 12 77 66 288 12 Alternative 5E 5.3 12 77 66 285 12 

6 Proposed – Total Length 0.5

Forest Woodlands

42

Segment 

Length (Miles)

Shrublands Grass

5

Pre-Constructi

1W

1E

Proposed or Alternative Name

Segment 

Number

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

Table D.10-5a Page 1 of 4
Gateway West Transmission Line Draft 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 118.1 36 1108 94 2165 42 Proposed – Comparison portion for Alternatives 7A,B 35.2 45 643 129 767 22 Alternative 7A 38.0 35 836 156 753 23 Alternative 7B 46.4 21 959 184 817 22 Proposed – Comparison portion for Alternative 7C 20.1 16 170 62 628 81 Alternative 7C 20.3 15 184 75 477 76 Proposed – Comparison portion for Alternative 7D 6.2 30 105 69 333 49 Alternative 7D 6.8 30 105 67 342 49 Proposed – Comparison portion for Alternative 7E 3.8 22 92 131 129 18 Alternative 7E 4.5 22 96 121 148 20 Proposed – Comparison portion for Alternative 7F 10.5 31 140 120 214 22 Alternative 7F 10.8 32 151 122 229 23 Proposed – Comparison portion for Alternative 7G 3.1 20 138 224 87 13 Alternative 7G 3.2 20 134 230 84 13 Proposed – Comparison portion for Alternatives 7H,I 118.1 36 1108 94 2165 42 Alternative 7H 127.5 35 1951 145 2311 36 Alternative 7I 173.4 23 2224 194 2901 40 Proposed – Comparison portion 7/9 for Alternative 7J 1/ 143.9 33 1234 73 3465 36 

Alternative 7J1/ 202.1 22 2260 168 3887 35 

Proposed – Total Length 131.0 50 6085 32 Proposed – Comparison portion for Alternative 8A 51.4 51 2008 40 Alternative 8A 53.6 34 2390 40 Proposed – Comparison portion for Alternative 8B 45.3 47 2692 29 Alternative 8B 45.8 44 2062 34 Proposed – Comparison portion for Alternative 8C 6.5 45 714 29 Alternative 8C 6.4 44 727 30 Proposed – Comparison portion for Alternative 8D 6.9 36 884 35 Alternative 8D 8.1 36 907 38 Proposed – Comparison portion for Alternative 8E 7.0 38 743 34 Alternative 8E 18.5 39 1273 35 Proposed – Total Length 161.7 15 101 55 6153 41 Proposed – Comparison portion for Alternative 9A 7.8 9 13 66 304 41 Alternative 9A 7.7 9 13 69 316 42 Proposed – Comparison portion for Alternative 9B 49.5 69 1771 50 Alternative 9B 53.2 47 2251 39 Proposed – Comparison portion for Alternative 9C 14.7 146 427 20 Alternative 9C 15.3 139 422 15 Proposed – Comparison portion for Alternatives 9D-9H 57.2 43 2807 41 Alternative 9D 58.4 33 3767 31 Alternative 9E 68.7 25 81 94 2340 39 Alternative 9F 62.9 34 3751 34 Alternative 9G 56.4 35 3514 32 Alternative 9H 61.0 35 3601 35 

10 Proposed – Total Length 33.6 16 66 31 875 75 

Segment 

Number Proposed or Alternative Name

Segment 

Length (Miles)

Pre-Constructi

Forest Woodlands Shrublands Grass

1/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for S

Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 7 of the Proposed Route (11

789

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

Table D.10-5a Page 2 of 4
Gateway West Transmission Line Draft 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 100.6 328 336 217 816 204 Proposed – Comparison portion for Alternative 1E-A 17.6 153 27 123 273 114 Alternative 1E-A 16.1 157 32 131 226 116 Proposed – Comparison portion for Alternative 1E-B 37.9 449 53 259 284 430 Alternative 1E-B 59.3 461 133 235 389 346 Proposed – Comparison portion for Alternative 1E-C 75.4 340 309 258 555 299 Alternative 1E-C 48.7 242 186 149 460 246 1W(a) Proposed – Total Length 76.5 234 215 139 735 194 Proposed – Comparison portion for Alternative 1W-A 20.3 148 26 121 275 136 Alternative 1W-A 16.2 150 31 136 227 113 1W(c) Proposed – Total Length 70.6 237 224 146 679 182 Proposed – Total Length 96.7 279 1651 115 Proposed – Comparison portion for Alternative 2A 28.8 179 841 260 Alternative 2A 28.4 170 882 260 Proposed – Comparison portion for Alternative 2B 7.0 191 276 260 Alternative 2B 6.2 178 267 260 Proposed – Comparison portion for Alternative 2C 28.4 190 814 61 Alternative 2C 24.4 208 677 61 

3 Proposed – Total Length 56.4 153 13 380 857

Proposed – Total Length 203.0 97 1138 229 3336 15 Proposed – Comparison portion for Alternatives 4A-4F 90.2 535 101 330 1164 24 Alternative 4A 85.2 161 78 316 1266 24 Alternative 4B 100.2 6 11 343 1374 12 Alternative 4C 101.6 6 11 340 1380 11 Alternative 4D 100.8 6 11 343 1377 12 Alternative 4E 102.2 6 11 340 1383 11 Alternative 4F 87.5 251 100 315 1267 24 Proposed – Total Length 54.6 42 778 74 1590 17 Proposed – Comparison portion for Alternatives 5A,B 25.3 48 553 90 798 15 Alternative 5A 33.7 43 776 93 978 19 Alternative 5B 44.4 30 942 105 1221 18 Proposed – Comparison portion for Alternative 5C 33.2 46 669 88 958 16 Alternative 5C 26.1 18 634 89 1027 18 Proposed – Comparison portion for Alternative 5D 19.4 52 327 68 653 14 Alternative 5D 17.5 50 293 62 618 14 Proposed – Comparison portion for Alternative 5E 5.8 11 88 56 340 12 Alternative 5E 5.3 11 88 56 335 12 

6 Proposed – Total Length 0.5

Segment 

Length (Miles)

Post-Construct

Forest Woodlands Shrublands Grass

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

4

Segment 

Number Proposed or Alternative Name

1E

1W

25

Table D.10-5a Page 3 of 4
Gateway West Transmission Line Draft 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 118.1 31 1288 75 2716 38 Proposed – Comparison portion for Alternatives 7A,B 35.2 37 768 94 1057 20 Alternative 7A 38.0 29 1003 107 1090 20 Alternative 7B 46.4 18 1092 124 1214 19 Proposed – Comparison portion for Alternative 7C 20.1 15 180 56 694 74 Alternative 7C 20.3 15 194 66 543 69 Proposed – Comparison portion for Alternative 7D 6.2 28 114 56 411 40 Alternative 7D 6.8 28 114 55 420 40 Proposed – Comparison portion for Alternative 7E 3.8 16 121 73 233 14 Alternative 7E 4.5 17 125 71 252 15 Proposed – Comparison portion for Alternative 7F 10.5 26 169 80 320 18 Alternative 7F 10.8 27 180 84 335 18 Proposed – Comparison portion for Alternative 7G 3.1 18 148 137 142 11 Alternative 7G 3.2 19 144 139 139 11 Proposed – Comparison portion for Alternatives 7H,I 118.1 31 1288 75 2716 38 Alternative 7H 127.5 32 2148 115 2924 32 Alternative 7I 173.4 21 2420 154 3636 36 Proposed – Comparison portion 7/9 for Alternative 7J 1/ 143.9 31 1295 67 3785 34 

Alternative 7J1/ 202.1 20 2458 138 4728 32 

Proposed – Total Length 131.0 47 6548 30 Proposed – Comparison portion for Alternative 8A 51.4 48 2152 38 Alternative 8A 53.6 31 2568 37 Proposed – Comparison portion for Alternative 8B 45.3 43 2941 27 Alternative 8B 45.8 41 2216 32 Proposed – Comparison portion for Alternative 8C 6.5 41 774 27 Alternative 8C 6.4 41 787 28 Proposed – Comparison portion for Alternative 8D 6.9 34 933 33 Alternative 8D 8.1 34 958 35 Proposed – Comparison portion for Alternative 8E 7 34 810 31 Alternative 8E 18.5 35 1401 31 Proposed – Total Length 161.7 15 105 50 6867 37 Proposed – Comparison portion for Alternative 9A 7.8 9 13 53 376 37 Alternative 9A 7.7 9 13 56 392 38 Proposed – Comparison portion for Alternative 9B 49.5 61 2003 46 Alternative 9B 53.2 41 2524 36 Proposed – Comparison portion for Alternative 9C 14.7 122 511 19 Alternative 9C 15.3 116 507 15 Proposed – Comparison portion for Alternatives 9D-9H 57.2 40 3046 37 Alternative 9D 58.4 31 4076 29 Alternative 9E 68.7 25 81 84 2643 36 Alternative 9F 62.9 32 4045 31 Alternative 9G 56.4 32 3797 30 Alternative 9H 61 32 3885 32 

10 Proposed – Total Length 33.6 15 70 29 938 68 

Segment 

Number Proposed or Alternative Name

Segment 

Length (Miles)

Post-Construct

Forest Woodlands Shrublands Grass

1/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for S

Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 7 of the Proposed Route (11

789

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

Table D.10-5a Page 4 of 4
Gateway West Transmission Line Draft EIS

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

Change in 

Average Patch 

Size (Acre)

Change in 

Patch Count

Change in 

Average Patch 

Size (Acre)

Change in 

Patch Count

Change in 

Average Patch 

Size (Acre)

Proposed – Total Length 100.6 -416 188 -77 213 -101 Proposed – Comparison portion for Alternative 1E-A 17.6 -261 17 -38 64 -60 Alternative 1E-A 16.1 -178 17 -50 62 -61 Proposed – Comparison portion for Alternative 1E-B 37.9 -503 28 -105 82 -83 Alternative 1E-B 59.3 -427 64 -55 74 -68 Proposed – Comparison portion for Alternative 1E-C 75.4 -438 174 -98 153 -144 Alternative 1E-C 48.7 -375 113 -65 139 -177 1W(a) Proposed – Total Length 76.5 -345 128 -52 199 -112 Proposed – Comparison portion for Alternative 1W-A 20.3 -280 17 -36 63 -63 Alternative 1W-A 16.2 -182 17 -51 62 -58 1W(c) Proposed – Total Length 70.6 -316 128 -58 193 -114 Proposed – Total Length 96.7 -77 357 -93 Proposed – Comparison portion for Alternative 2A 28.8 -56 200 Alternative 2A 28.4 -52 207 Proposed – Comparison portion for Alternative 2B 7.0 -67 72 Alternative 2B 6.2 -66 72 Proposed – Comparison portion for Alternative 2C 28.4 -55 183 Alternative 2C 24.4 -68 167 

3 Proposed – Total Length 56.4 -126 202

Proposed – Total Length 203.0 -11 119 -45 544 < -1 Proposed – Comparison portion for Alternatives 4A-4F 90.2 -248 32 -103 276 < -1 Alternative 4A 85.2 -35 14 -85 269 < -1 Alternative 4B 100.2 -103 317 < -1 Alternative 4C 101.6 -105 325 < -1 Alternative 4D 100.8 -102 317 < -1 Alternative 4E 102.2 -105 325 < -1 Alternative 4F 87.5 -93 27 -79 254 < -1 Proposed – Total Length 54.6 -9 131 -19 324 -1 Proposed – Comparison portion for Alternatives 5A,B 25.3 -12 107 -34 219 -1 Alternative 5A 33.7 -14 193 -48 332 -4 Alternative 5B 44.4 -8 197 -61 447 -3 Proposed – Comparison portion for Alternative 5C 33.2 -10 118 -32 253 -1 Alternative 5C 26.1 -1 44 -18 175 -1 Proposed – Comparison portion for Alternative 5D 19.4 -14 70 -19 143 -1 Alternative 5D 17.5 -15 68 -18 138 -1 Proposed – Comparison portion for Alternative 5E 5.8 -2 11 -10 52 < -1 Alternative 5E 5.3 -2 11 -10 50 < -1 

6 Proposed – Total Length 0.5

Segment 

Number Proposed or Alternative Name

Segment 

Length (Miles)

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

1E

1W

Forest Woodlands Shrublands Grass

245

Table D.10-5b Page 1 of 2
Gateway West Transmission Line Draft EIS

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

Change in 

Average Patch 

Size (Acre)

Change in 

Patch Count

Change in 

Average Patch 

Size (Acre)

Change in 

Patch Count

Change in 

Average Patch 

Size (Acre)

Proposed – Total Length 118.1 -5 180 -19 551 -4 Proposed – Comparison portion for Alternatives 7A,B 35.2 -7 125 -35 290 -2 Alternative 7A 38.0 -6 167 -48 337 -3 Alternative 7B 46.4 -3 133 -60 397 -3 Proposed – Comparison portion for Alternative 7C 20.1 < -1 10 -6 66 -6 Alternative 7C 20.3 < -1 10 -9 66 -7 Proposed – Comparison portion for Alternative 7D 6.2 -2 9 -13 78 -9 Alternative 7D 6.8 -2 9 -13 78 -9 Proposed – Comparison portion for Alternative 7E 3.8 -5 29 -59 104 -4 Alternative 7E 4.5 -5 29 -50 104 -5 Proposed – Comparison portion for Alternative 7F 10.5 -5 29 -40 106 -5 Alternative 7F 10.8 -5 29 -39 106 -4 Proposed – Comparison portion for Alternative 7G 3.1 -1 10 -87 55 -2 Alternative 7G 3.2 -1 10 -91 55 -2 Proposed – Comparison portion for Alternatives 7H,I 118.1 -5 180 -19 551 -4 Alternative 7H 127.5 -3 197 -30 613 -4 Alternative 7I 173.4 -2 196 -39 735 -3 Proposed – Comparison portion 7/9 for Alternative 7J 1/ 143.9 -2 61 -6 320 -2 

Alternative 7J1/ 202.1 -2 198 -30 841 -3 

Proposed – Total Length 131.0 -4 463 -2 Proposed – Comparison portion for Alternative 8A 51.4 -3 144 -3 Alternative 8A 53.6 -2 178 -3 Proposed – Comparison portion for Alternative 8B 45.3 -4 249 -2 Alternative 8B 45.8 -3 154 -2 Proposed – Comparison portion for Alternative 8C 6.5 -3 60 -2 Alternative 8C 6.4 -3 60 -2 Proposed – Comparison portion for Alternative 8D 6.9 -2 49 -3 Alternative 8D 8.1 -2 51 -3 Proposed – Comparison portion for Alternative 8E 7.0 -3 67 -3 Alternative 8E 18.5 -4 128 -3 Proposed – Total Length 161.7 < -1 4 -6 714 -4 Proposed – Comparison portion for Alternative 9A 7.8 -13 72 -4 Alternative 9A 7.7 -13 76 -4 Proposed – Comparison portion for Alternative 9B 49.5 -8 232 -4 Alternative 9B 53.2 -5 273 -4 Proposed – Comparison portion for Alternative 9C 14.7 -24 84 < -1 Alternative 9C 15.3 -23 85 < -1 Proposed – Comparison portion for Alternatives 9D-9H 57.2 -3 239 -4 Alternative 9D 58.4 -3 309 -2 Alternative 9E 68.7 -11 303 -3 Alternative 9F 62.9 -3 294 -3 Alternative 9G 56.4 -3 283 -3 Alternative 9H 61.0 -3 284 -3 

10 Proposed – Total Length 33.6 < -1 4 -2 63 -8 

1/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for S

of Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 7 of the Proposed Route (Note: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

Segment 

Number

789

Proposed or Alternative Name

Segment 

Length (Miles)

Forest Woodlands Shrublands Grass

Table D.10-5b Page 2 of 2
Gateway West Transmission Line Draft EIS

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

Proposed – Total Length 100.6 37 105 Proposed – Comparison portion for Alternative 1E-A 17.6 Alternative 1E-A 16.1 Proposed – Comparison portion for Alternative 1E-B 37.9 40 Alternative 1E-B 59.3 207 Proposed – Comparison portion for Alternative 1E-C 75.4 37 105 Alternative 1E-C 48.7 34 1W(a) Proposed – Total Length 76.5 38 Proposed – Comparison portion for Alternative 1W-A 20.3 Alternative 1W-A 16.2 1W(c) Proposed – Total Length 70.6 59 Proposed – Total Length 96.7 257 Proposed – Comparison portion for Alternative 2A 28.8 208 Alternative 2A 28.4 29 Proposed – Comparison portion for Alternative 2B 7.0 Alternative 2B 6.2 Proposed – Comparison portion for Alternative 2C 28.4 237 Alternative 2C 24.4 t1/ 

3 Proposed – Total Length 56.5 

Proposed – Total Length 203.0 99 791 Proposed – Comparison portion for Alternatives 4A-4F 90.2 99 539 Alternative 4A 85.2 131 296 Alternative 4B 100.2 551 Alternative 4C 101.6 545 Alternative 4D 100.8 546 Alternative 4E 102.2 539 Alternative 4F 87.5 148 195 Proposed – Total Length 54.6 1 Proposed – Comparison portion for Alternatives 5A,B 25.3 1 Alternative 5A 33.7 Alternative 5B 44.4 Proposed – Comparison portion for Alternative 5C 33.2 1 Alternative 5C 26.1 131 Proposed – Comparison portion for Alternative 5D 19.4 Alternative 5D 17.5 Proposed – Comparison portion for Alternative 5E 5.8 Alternative 5E 5.3 

6 Proposed – Total Length 0.5 

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

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

2

Acres of Wild

Elk 

Elk Calving Areas Winter Rang

Elk 

Summer Range

Bighorn Sheep 

Winter Range

Segment 

Length (Miles)

4

1E

5

Proposed or Alternative Name

Segment 

Number

1W

Table D.10-6 Page 1 of 2
Gateway West Transmission Line Draft EIS

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

Proposed – Total Length 118.1 Proposed – Comparison portion for Alternatives 7A,B 35.2 Alternative 7A 38.0 Alternative 7B 46.4 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 3.1 Alternative 7G 3.2 Proposed – Comparison portion for Alternatives 7H,I 118.1 Alternative 7H 127.5 26 

Alternative 7I 173.4 90 5 Proposed – Comparison portion 7/9 for Alternative 7J 2/ 143.9 

Alternative 7J2/ 202.1 90 5 

Proposed – Total Length 131.0 273 Proposed – Comparison portion for Alternative 8A 51.4 Alternative 8A 53.6 Proposed – Comparison portion for Alternative 8B 45.3 92Alternative 8B 45.8 92Proposed – Comparison portion for Alternative 8C 6.5 92Alternative 8C 6.4 93Proposed – Comparison portion for Alternative 8D 6.9Alternative 8D 8.1Proposed – Comparison portion for Alternative 8E 7.0Alternative 8E 18.5 16Proposed – Total Length 161.7 

Proposed – Comparison portion for Alternative 9A 7.8 Alternative 9A 7.7 Proposed – Comparison portion for Alternative 9B 49.5Alternative 9B 53.2Proposed – Comparison portion for Alternative 9C 14.7Alternative 9C 15.3Proposed – Comparison portion for Alternatives 9D-9H 57.2 Alternative 9D 58.4 16 

Alternative 9E 68.7 195 

Alternative 9F 62.9 16 

Alternative 9G 56.4 26 

Alternative 9H 61.0 26 

10 Proposed – Total Length 33.6 

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

8

Elk 

Summer Range

Bighorn Sheep 

Winter Range Elk Calving Areas

Acres of Wild

7

Elk 

Winter Rang

2/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for S

corresponding portion of Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 7 o

9

Segment 

Number Proposed or Alternative Name

Segment 

Length (Miles)

Table D.10-6 Page 2 of 2
Gateway West Transmission Line Draft EIS

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

American Kestrel Bald Eagle Burrowing Owl Common Raven Ferruginous Hawk Golden Eagl

Proposed –Total Length 100.6 38 65 Proposed – Comparison portion for Alternative 1E-A 17.6Alternative 1E-A 16.1 12Proposed – Comparison portion for Alternative 1E-B 37.9 38 37 Alternative 1E-B 59.3 76 74 Proposed – Comparison portion for Alternative 1E-C 75.4 38 65 Alternative 1E-C 48.7 25 1W(a) Proposed – Total Length 76.5 32 4 Proposed – Comparison portion for Alternative 1W-A 20.3Alternative 1W-A 16.2 111W(c) Proposed – Total Length 70.6 21 61 Proposed – Total Length 96.7 41 1 55 558 274 Proposed – Comparison portion for Alternative 2A 28.8 1 150 66 Alternative 2A 28.4 21 26 85 62 Proposed – Comparison portion for Alternative 2B 7.0 1 53 Alternative 2B 6.2 28 0 Proposed – Comparison portion for Alternative 2C 28.4 157 92 Alternative 2C 24.4 45 152 156 

3 Proposed – Total Length 56.5 20 51 178 154 

Proposed – Total Length 203.0 23 18 22 134 135 77 Proposed – Comparison portion for Alternatives 4A-4F 90.2 20 22 46 4 Alternative 4A 85.2 17 20 28 52 Alternative 4B 100.2 10 73 21 t1/ 58 

Alternative 4C 101.6 10 73 21 t1/ 58 Alternative 4D 100.8 11 73 21 t1/ 58 Alternative 4E 102.2 11 73 21 t1/ 58 Alternative 4F 87.5 18 20 28 52 Proposed – Total Length 54.6 28 27Proposed – Comparison portion for Alternatives 5A,B 25.3Alternative 5A 33.7Alternative 5B 44.4Proposed – Comparison portion for Alternative 5C 33.2Alternative 5C 26.1Proposed – Comparison portion for Alternative 5D 19.4 28Alternative 5D 17.5 21Proposed – Comparison portion for Alternative 5E 5.8 28Alternative 5E 5.3 <1

6 Proposed – Total Length 0.5

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

1W

2

Raptor and Birds of Prey Habitat Impac

Proposed or Alternative Name

Segment Number

1E

Segment 

Length 

(Miles)

45

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

Table D.10-7 Page 1 of 2
Gateway West Transmission Line Draft 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 Eagl

Proposed – Total Length 118.1 85 68Proposed – Comparison portion for Alternatives 7A,B 35.2Alternative 7A 38.0Alternative 7B 46.4Proposed – Comparison portion for Alternative 7C 20.1 47 13Alternative 7C 20.3 22Proposed – Comparison portion for Alternative 7D 6.2 19Alternative 7D 6.8 27Proposed – Comparison portion for Alternative 7E 3.8 46Alternative 7E 4.5 37Proposed – Comparison portion for Alternative 7F 10.5 55Alternative 7F 10.8 37Proposed – Comparison portion for Alternative 7G 3.1Alternative 7G 3.2Proposed – Comparison portion for Alternatives 7H,I 118.1 85 68Alternative 7H 127.5 19 315 

Alternative 7I 173.4 19 240 41 Proposed – Comparison portion 7/9 for Alternative 7J2/ 143.9 85 14 159 t1/

Alternative 7J2/ 202.1 19 25 334 41 

Proposed – Total Length 131.0 316 746 Proposed – Comparison portion for Alternative 8A 51.4 15Alternative 8A 53.6Proposed – Comparison portion for Alternative 8B 45.3 300 496 Alternative 8B 45.8 154 212Proposed – Comparison portion for Alternative 8C 6.5 1 139Alternative 8C 6.4 13 113Proposed – Comparison portion for Alternative 8D 6.9 114 123Alternative 8D 8.1 140 143Proposed – Comparison portion for Alternative 8E 7.0 83 20Alternative 8E 18.5 79 205Proposed – Total Length 161.7 240 77 470 t1/ 

Proposed – Comparison portion for Alternative 9A 7.8 14Alternative 9A 7.7 18Proposed – Comparison portion for Alternative 9B 49.5 82 99 Alternative 9B 53.2 13 43 Proposed – Comparison portion for Alternative 9C 14.7 25 93 Alternative 9C 15.3 41 43 Proposed – Comparison portion for Alternatives 9D-9H 57.2 112 34 167Alternative 9D 58.4 251 287 Alternative 9E 68.7 50 127Alternative 9F 62.9 270 398Alternative 9G 56.4 241 281Alternative 9H 61.0 260 372

10 Proposed – Total Length 33.6 20

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

Segment 

Length 

(Miles)

Raptor and Birds of Prey Habitat Impac

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

2/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for Segment 9. 

of Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 7 of the Proposed Route (118.1 mileSegment Number

987

Proposed or Alternative Name

Table D.10-7 Page 2 of 2
Gateway West Transmission Line Draft EIS

Proposed – Total Length 100.6 10 24 Proposed – Compare to Alternative 1E-A 17.6 Alternative 1E-A 16.1 Proposed – Compare to Alternative 1E-B 37.9 9 Alternative 1E-B 59.3 46 Proposed – Compare to Alternative 1E-C 75.4 10 24 Alternative 1E-C 48.7 10 1W(a) Proposed – Total Length 76.5 11 Proposed – Comparison portion for Alternative 1W-A 20.3 Alternative 1W-A 16.2 1W(c) Proposed – Total Length 70.6 10 Proposed – Total Length 96.7 47 34 Proposed – Compare to Alternative 2A 28.8 39 27 Alternative 2A 28.4 <1 2 Proposed – Compare to Alternative 2B 7.0 8 Alternative 2B 6.2 1 Proposed – Compare to Alternative 2C 28.4 47 26 Alternative 2C 24.4 t1/ t1/ 

3 Proposed – Total Length 56.5 

Proposed – Total Length 203.0 24 169 70 Proposed – Comparison portion for Alternatives 4A-4F 90.2 24 116 70 Alternative 4A 85.2 39 72 89 Alternative 4B 100.2 121 12 Alternative 4C 101.6 114 41 Alternative 4D 100.8 125 12 Alternative 4E 102.2 116 41 Alternative 4F 87.5 46 43 85 Proposed – Total Length 54.6 <1 Proposed – Compare to Alternatives 5A,B 25.3 <1 Alternative 5A 33.7 Alternative 5B 44.4 Proposed – Compare to Alternative 5C 33.2 <1 Alternative 5C 26.1 15 Proposed – Compare to Alternative 5D 19.4 Alternative 5D 17.5 Proposed – Compare to Alternative 5E 5.8 Alternative 5E 5.3 

6 Proposed – Total Length 0.5 

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

Proposed or Alternative Name

Segment 

Number

1E

5

Segment 

Length (Miles)

2

1W

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

Acres of Wildlife Habitat Im

Moose 

Winter Ra

Elk 

Winter Range

4

Elk Calving 

Areas

Elk 

Summer Range

Bighorn Sheep 

Winter Range

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

Table D.10-8 Page 1 of 2
Gateway West Transmission Line Draft EIS

Proposed – Total Length 118.1 Proposed – Comparison portion for Alternatives 7A,B 35.2 Alternative 7A 38.0 Alternative 7B 46.4 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 3.1 Alternative 7G 3.2 Proposed – Compare to Alternatives 7H,I 118.1 Alternative 7H 127.5 4 Alternative 7I 173.4 17 3 Proposed – Comparison portion 7/9 for Alternative 7J 2/ 143.9 Alternative 7J2/ 202.1 17 3 Proposed – Total Length 131.0 32 Proposed – Compare to Alternative 8A 51.4 Alternative 8A 53.6 Proposed – 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 7.0Alternative 8E 18.5 1

Proposed – Total Length 161.7 

Proposed – Compare to Alternative 9A 7.8 Alternative 9A 7.7 Proposed – Compare to Alternative 9B 49.5Alternative 9B 53.2Proposed – Compare to Alternative 9C 14.7Alternative 9C 15.3Proposed – Comparison portion for Alternatives 9D-9H 57.2 

Alternative 9D 58.4 1 Alternative 9E 68.7 32 

Alternative 9F 62.9 1 Alternative 9G 56.4 2 Alternative 9H 61.0 2 

10 Proposed – Total Length 33.6 

7

9

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

Segment 

Number Proposed or Alternative Name

Segment 

Length (Miles)

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

2/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for S

corresponding portion of Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 7 o

Acres of Wildlife Habitat Im

Elk Calving 

Areas

Elk 

Winter Range

Bighorn Sheep 

Winter Range

Moose 

Winter Ra

8

Elk 

Summer Range

Table D.10-8 Page 2 of 2
Gateway West Transmission Line Draft EIS

Table D.10-9. Acres of Operational Impacts that Would Occur within a 1-mile Buffer around Raptors and Birds of Prey Nests

American Kestrel Bald Eagle Burrowing Owl

Common 

Raven

Ferruginous 

Hawk Golden Eagle

Proposed – Total Length 100.6 11 15 Proposed – Comparison portion for Alternative 1E-A 17.6Alternative 1E-A 16.1 4Proposed – Comparison portion for Alternative 1E-B 37.9 11 11 Alternative 1E-B 59.3 14 15 Proposed – Comparison portion for Alternative 1E-C 75.4 11 15 Alternative 1E-C 48.7 7 1W(a) Proposed – Total Length 76.5 9 2Proposed – Comparison portion for Alternative 1W-A 20.3Alternative 1W-A 16.2 31W(c) Proposed – Total Length 70.6 4 11 Proposed – Total Length 96.7 12 0 11 135 79 Proposed – Comparison portion for Alternative 2A 28.8 0 23 14 Alternative 2A 28.4 5 7 15 15 Proposed – Comparison portion for Alternative 2B 7.0 0 8 Alternative 2B 6.2 6 t1/ 

Proposed – Comparison portion for Alternative 2C 28.4 30 20 Alternative 2C 24.4 8 20 22 

3 Proposed – Total Length 56.5 5 9 33 78 

Proposed – Total Length 203.0 6 4 4 26 29 34 Proposed – Comparison portion for Alternatives 4A-4F 90.2 5 4 10 2 Alternative 4A 85.2 3 5 10 Alternative 4B 100.2 2 12 5 t1/ 16 

Alternative 4C 101.6 2 12 5 t1/ 16 Alternative 4D 100.8 2 12 5 t1/ 16 Alternative 4E 102.2 2 12 5 t1/ 16 Alternative 4F 87.5 4 5 10 Proposed – Total Length 54.6 1 4Proposed – Comparison portion for Alternatives 5A,B 25.3Alternative 5A 33.7Alternative 5B 44.4Proposed – Comparison portion for Alternative 5C 33.2Alternative 5C 26.1Proposed – Comparison portion for Alternative 5D 19.4 1Alternative 5D 17.5 3Proposed – Comparison portion for Alternative 5E 5.8 1Alternative 5E 5.3 <1

6 Proposed – Total Length 0.5

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

1W

24

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

Proposed or Alternative Name

Raptor and Birds of Prey Habitat Impacts (

Segment 

Number

1E

Segment Length 

(Miles)

5

Table D.10-9 Page 1 of 2
Gateway West Transmission Line Draft EIS

Table D.10-9. Acres of Operational 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

Proposed – Total Length 118.1 9 8Proposed – Comparison portion for Alternatives 7A,B 35.2Alternative 7A 38.0Alternative 7B 46.4Proposed – Comparison portion for Alternative 7C 20.1 7 2Alternative 7C 20.3 2Proposed – Comparison portion for Alternative 7D 6.2 <1Alternative 7D 6.8 <1Proposed – Comparison portion for Alternative 7E 3.8 4Alternative 7E 4.5 3Proposed – Comparison portion for Alternative 7F 10.5 6Alternative 7F 10.8 4Proposed – Comparison portion for Alternative 7G 3.1Alternative 7G 3.2Proposed – Comparison portion for Alternatives 7H,I 118.1 9 8Alternative 7H 127.5 2 46 Alternative 7I 173.4 2 38 7 Proposed – Comparison portion 7/9 for Alternative 7J 2/ 143.9 9 3 20

Alternative 7J2/ 202.1 2 <1 44 7 Proposed – Total Length 131.0 35 89 Proposed – Comparison portion for Alternative 8A 51.4 1Alternative 8A 53.6Proposed – Comparison portion for Alternative 8B 45.3 34 61 Alternative 8B 45.8 12 24Proposed – Comparison portion for Alternative 8C 6.5 <1 15Alternative 8C 6.4 <1 16Proposed – Comparison portion for Alternative 8D 6.9 17 19Alternative 8D 8.1 15 15Proposed – Comparison portion for Alternative 8E 7.0 8 2Alternative 8E 18.5 10 19Proposed – Total Length 161.7 27 13 65 Proposed – Comparison portion for Alternative 9A 7.8 3Alternative 9A 7.7 2Proposed – Comparison portion for Alternative 9B 49.5 8 13 Alternative 9B 53.2 1 6 Proposed – Comparison portion for Alternative 9C 14.7 <1 10 Alternative 9C 15.3 4 9Proposed – Comparison portion for Alternatives 9D-9H 57.2 11 6 21Alternative 9D 58.4 31 29 Alternative 9E 68.7 5 12Alternative 9F 62.9 31 43Alternative 9G 56.4 30 29Alternative 9H 61.0 31 42

10 Proposed – Total Length 33.6 2

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

2/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for Segment 9. The tab

of Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 7 of the Proposed Route (118.1 miles) only.

Proposed or Alternative Name

Segment Length 

(Miles)

Raptor and Birds of Prey Habitat Impacts (

789

Segment 

Number

Table D.10-9 Page 2 of 2
Gateway West Transmission Line Draft EIS

Proposed – Total Length 96.7 323 Proposed – Comparison portion for Alternative 2A 28.8 256 Alternative 2A 28.4 30 Proposed – Comparison portion for Alternative 2B 7.0 Alternative 2B 6.2 Proposed – Comparison portion for Alternative 2C 28.4 303 Alternative 2C 24.4 t1/ 

3 Proposed – Total Length 56.5 

Proposed – Total Length 203.0 122 1034 Proposed – Comparison portion for Alternatives 4A-4F 90.2 122 714 Alternative 4A 85.2 168 373 Alternative 4B 100.2 731 Alternative 4C 101.6 726 Alternative 4D 100.8 710 Alternative 4E 102.2 705 Alternative 4F 87.5 197 239 

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

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

4

Bighorn Sheep 

Winter Range

Table D.10-10. Acres of Construction Impacts to Big Game Habitat Impacted by the Design Alternative

Elk 

Proposed or Alternative Name Elk Calving Areas Winter Range

Segment 

Number

Win

Elk 

Summer Range

2

Segment Length 

(Miles)

Acres of Wildlife Habitat Impa

Table D.10-10 Page 1 of 1
Gateway West Transmission Line Draft EIS

Table D.11-1 Page 1 of 3

Common Name Scientific Name

ESA Status/ State 

Located in Federal Agency Status

State Species of 

Greatest 

Conservation Need 

(SGCN) / State 

Listed in Habitat Description

Does the Species Have Distribution or Potential Habitat 

within the Analysis Area?

Habitat Unit used for 

Analysis

Segments Species 

may be Present In

Black-footed 

Ferret

Mustela 

nigripes Endangered / WY - SGCN / Wyoming

Ferrets use open habitat used by prairie dogs such as: grasslands, steppe, and shrub steppe. The ferrets do not dig their 

own burrows and rely on abandoned prairie dog burrows for shelter. Only large complexes (several thousand acres of 

closely spaced colonies) can support and sustain a breeding population of black-footed ferrets. 

Yes – Currently, there is a known black-footed ferret 

population in the Shirley Basin in the Rawlins FO. Potential 

black-footed ferret habitat occurs within the Kemmerer FO, 

Rock Springs FO and Rawlins FO.

Prairie dog towns (>200 

acres) were mapped and 

used to represent BFF 

habitat. 

2, 3, 4

SGCN / Wyoming

SGCN / Idaho

Gray Wolf Canus lupus

Non-essential 

Experimental Population 

/ WY

Endangered / ID

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 – The Analysis Area is in the Yellowstone and Central 

Idaho non-experimental population area. It is probable that 

transitory wolves may use portions of the Analysis Area 

while dispersing to new areas. 

Known locations of wolf 

packs mapped by the 

IDCDC and the WYNDD.

All segments could 

provide habitat for 

this species.

Grizzly Bear Ursus arctos 

horribilis Threatened / ID; WY FS sensitive (R2) SGCN / Wyoming Grizzly bears are habitat generalist, but are found most often in open mountainous habitats away from human 

developments.

Yes- The Project would pass through the southern boundary 

of the Yellowstone Distinct Population Segment (DPS).

The boundary of the 

Yellowstone DPS. 3, 4

Northern Idaho 

Ground squirrel 

Spermophilus 

brunneus 

brunneus

Threatened / ID - SGCN / Idaho

Idaho Ground Squirrels are only found in west-central Idaho within Adams and Valley counties (USFWS 2003). Habitat for 

this species occurs in medium high elevations, surrounded by forests. Populations are typically associated with shallow 

rocky soils in xeric meadows surrounded by ponderosa pine and Douglas-fir forests.

No – The Analysis Area does not intercept the species 

current distribution. In addition, limited habitat for the 

species occurs within the Analysis Area.

N/A N/A

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 grasslands. 

These areas are often dominated by annual grassland with relict big sagebrush and bunch grasses. Distribution extends 

from Emmett, Idaho, northwest to Weiser, Idaho and the surrounding area of Squaw Butte, Midvale Hill, and Henley Basin 

in Gem, Payette, and Washington counties. Its range is bounded on the south by the Payette River, on the west by the 

Snake River and on the northeast by lava flows.

No – The Analysis Area lies to the south of the current 

distribution of this species. N/A N/A

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 home 

ranges ranging from 160 to 1,440 mi2.

No – The Project would cross through the Caribou-Targhee 

NF along Segment 4 (which contains wolverines); however, 

the high altitude mature forest habitat required by this 

species does not occur within the Analysis Area. 

N/A N/A

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 found in 

areas where adequate sagebrush is available to meet habitat and biological needs. As a sagebrush obligate species, 

greater sage grouse rely upon the plant species to meet most of its habitat needs during all aspects of its annual life 

cycles. Adequate stands of sagebrush are essential as greater sage grouse rely on the leaves for food and plant structure 

for cover.

Yes – Habitat occurs throughout the Analysis Area. Leks 

have been documented within 1⁄2 mile of both proposed and 

alternative segments. 

Shrubland

All segments could 

provide habitat for 

this species.

Interior Least 

Tern 

Sterna 

antillarum Endangered / WY - -

Interior least terns breed in isolated areas along the Missouri, Mississippi, Ohio, Red, and Rio Grande river systems. Their 

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 April 

to August.

Yes – Water withdrawals in the Platte River Watershed, 

regardless of location, could impact the species.

Areas down stream of the 

analysis area N/A

Mountain Plover Charadrius 

montanus Proposed

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 – Potential habitat for this species occurs throughout 

the Analysis Area. 

Xeric shrublands and 

grasslands with a slope of 

less than 9%.

1E, 1W, 2, 3, and 4 

Piping Plover Charadrius 

melodus Threatened / WY - -

In general, this species inhabits wide, sparsely vegetated sand or gravel beaches adjacent to vast alkali lakes; however, 

they can be found along the beaches near reservoirs, rivers, freshwater lakes, dry alkali lakes and industrial ponds, as 

well as sandpits and gravel mines

Yes – only in that water withdrawals in the Platte River 

Watershed, regardless of location could impact the species.

Areas down stream of the 

analysis area N/A

Whooping Crane Grus americana Endangered / WY - - This species inhabits shallow-water wetlands which varying in size (1–25 ha), shape, and depth. During migration, they 

can be found feeding in croplands and roosting in wetlands found along their migration paths.

Yes – only in that water withdrawals in the Platte River 

Watershed, regardless of location could impact the species.

Areas down stream of the 

analysis area N/A

SGCN / Wyoming

SGCN / Idaho

Birds

Riparian cottonwood forest 

of greater than 5 ha 

(Reynolds and Hinckley 

2005) with a percent 

overstory canopy of greater 

than 50 percent.

1E, 1W, 5, 7, 8, 9, 

10

Yellow-billed 

cuckoo

Coccyzus 

americanus

Candidate / west of 

continental divide

FS sensitive (R2, R4) east 

of the continental divide

BLM sensitive

Yes – The Project would cross through riparian habitats that 

could support this species.

Yellow-billed cuckoos are riparian obligate species that prefer extensive areas of dense thickets and mature deciduous 

forests near water, and requires low, dense, shrubby vegetation for nest sites. In Wyoming, the only areas that currently 

support the large cottonwood-riparian stands that are required by this species occur in isolated stands along the Bighorn, 

Powder, and North Platte rivers (WGFD N.D.). The Yellow-billed Cuckoo is considered an uncommon summer resident in 

Wyoming. In southwestern Idaho, the species is typically considered a ‘rare summer visitor’. There have been confirmed 

sightings within Owyhee, Canyon, Elmore, Ada, Blaine, and Twin Falls counties within the last 25 years (Taylor 2000). The 

most suitable habitat in Idaho for the species occurs along the Snake River corridor (Taylor 2000).

-

Table D.11-1. Threatened, Endangered, or Candidate Wildlife Species with the Potential to Occur within the Analysis Area 

Mammals

Canada Lynx Lynx 

canadensis Threatened / ID; WY

Yes – Segment 4 bisects linkage area and Lynx Analysis 

Unit (LAU). The LAU is described as core habitat and is 

considered occupied habitat (Forest Service 2005). 

Linkage area and Lynx 

Analysis Units (LAUs) were 

used to identify habitat. 

4

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 successional 

coniferous forests (Butts 1992).
Gateway West Transmission Line Draft EIS

Table D.11-1 Page 2 of 3

Common Name Scientific Name

ESA Status/ State 

Located in Federal Agency Status

 p 

Greatest 

Conservation Need 

(SGCN) / State Habitat Description

Does the Species Have Distribution or Potential Habitat 

within the Analysis Area?

Habitat Unit used for 

Analysis

Segments Species 

may be Present In

Fish

Bonytail Gila elegans Endangered/ ID; WY - - Slow moving waterbodies with rocky or muddy bottoms. Yes – only in that water withdrawals in the Colorado River 

Watershed, regardless of location could impact the species.

Rivers of the Colorado 

Basin. Green River 

intersects segment 4. 

N/A

Threatened / ID

MIS (Sawtooth NF)

Chinook Salmon Oncorhynchus 

tshawytscha Threatened / ID - SGCN / Idaho

In Idaho, spawning habitat in the Snake River Basin consists of streams that are shallow, clear, and cold with a strong 

upwelling of water through the gravel. Fry habitat is found primarily along the sides of pools and near the cover of overhanging banks. Adults migrate to sea for three to five years and return to natal streams days or weeks before spawning. No N/A N/A

Colorado 

Pikeminnow

Ptychocheilus 

lucius Endangered / ID; WY - -

The fish occurs in the warm, swift waters of the big rivers of the Colorado Basin. Adults are migratory and inhabit pools 

and eddies just outside the main current. Young can be found in backwater areas. Colorado pikeminnow are adapted to 

rivers with seasonally variable flow, high silt loads, and turbulence. Young-of-the-year and juvenile Colorado pikeminnow 

live 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 tolerate 

a broad range of temperatures from 35 degrees C in the summer to lower than 10 degrees C in winter.

Yes – only in that water withdrawals in the Colorado River 

Watershed, regardless of location could impact the species.

Rivers of the Colorado 

Basin. Green River 

intersects segment 4. 

N/A

Humpback Chub Gila cypha Endangered / ID; WY - -

The humpback chub lives primarily in canyons with swift currents and white water. Spawning occurs at depths ranging 1.8 

to 3.8 meters, and water velocities of 0.15 to 0.3 meters per second, over boulder, sand, and possibly gravel substrates. 

The 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. 

Yes – only in that water withdrawals in the Colorado River 

Watershed, regardless of location could impact the species.

Rivers of the Colorado 

Basin. Green River 

intersects segment 4.

N/A

Pallid Sturgeon Scaphirhynchus 

albus Endangered / ID; WY - -

This species is a bottom-oriented species inhabiting the Missouri and Mississippi Rivers from Montana to Louisiana. 

Pallid sturgeon live close to the bottom of large, silty rivers with swift currents and sandy bottoms. The preferred habitat is 

comprised of sand flats and gravel bars where water velocity ranges from 10 to 90 centimeters per second and water 

temperatures range from 32 to 86.degrees Fahrenheit. 

(http://www.epa.gov/espp/litstatus/effects/appendix_c_life_history_sturgeon.pdf)

Yes – only in that water withdrawals in the Platte River 

Watershed, regardless of location could impact the species.

Rivers of the Platte Basin. 

Green River intersects 

segment 4.

N/A

Razorback 

Sucker

Xyrauchen 

texanus Endangered / ID; WY - -

The razorback sucker occurred in medium to large rivers with swift turbulent waters, as well as slow backwater areas 

where it feeds on benthic fauna and flora, detritus, and plankton. Most wild fish are now found in Lake Mohave, which 

represents the largest population within the lower Colorado River basin. A few adults have also been found in Lake Mead 

and Lake Havasu. In the upper basin, they can be found in unimpounded waters of the Green, Yampa, and mainstem of 

the Colorado.

Yes – only in that water withdrawals in the Colorado River 

Watershed, regardless of location could impact the species.

Rivers of the Colorado 

Basin. Green River 

intersects segment 4.

N/A

Sockeye Salmon Oncorhynchus 

nerka Endangered / ID - SGCN / Idaho

Sockeye inhabit streams, rivers, lakes, estuaries, and marine environments of the Pacific coast. Spawning occurs in 

rivers or streams and upwelling areas along lake beaches. Streams and rivers used for spawning must have a lake in the 

system. Fry rear in lakes and then migrate to the sea. 

No – Occurs in Salmon River north of Analysis Area with the 

run terminating at Redfish Lake. N/A N/A

Steelhead Oncorhynchus 

mykiss Threatened / ID - SGCN / Idaho

Spawning steelhead require flat water greater than 9.4 inches deep with gravel small enough to dig in found between 

areas of steep gradients with large gravel. Optimal water temperatures range from 53.6 to 64.4 degrees Fahrenheit. Fry 

migrate downstream to estuaries and eventually to the sea. Adults return to natal streams to spawn.

No – Occurs in tributaries to the Salmon River north of the 

Analysis Area N/A N/A

White Sturgeon 

(Kootenai River)

Acipenser 

transmontanus Endangered / ID - SGCN / Idaho

In North America, white sturgeon is found from Ensenada, Mexico to the Cook Inlet in Alaska. Most are found in estuaries 

of large rivers along the Pacific coast. Older juveniles and adults are commonly found in rivers, estuaries, and marine 

environments. Spawning takes place in swift currents with a rocky bottom near rapids. Adult fish tend to occur in deeper, 

faster 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 locations 

can range from shallow murky side channels with pebbly and sandy bottoms to deeper, less murky main channels with 

larger boulders and cobble.

No Occurs in Snake River 

upstream to Shoshone Falls N/A

Bull Trout No N/A N/A Salvelinus 

confluentus -

In Idaho bull trout occur in the East Fork, West Fork, and headwater tributaries and primarily in headwaters above 7,200 

feet elevation within the Jarbidge Wilderness Area (including Slide, Pine, Sawmill, Fall, and Cougar Creeks), as well as 

Dave 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. Threatened, Endangered, or Candidate Wildlife Species with the Potential to Occur within the Analysis Area cont.
Gateway West Transmission Line Draft EIS

Table D.11-1 Page 3 of 3

Common Name Scientific Name

ESA Status/ State 

Located in Federal Agency Status

 p 

Greatest 

Conservation Need 

(SGCN) / State Habitat Description

Does the Species Have Distribution or Potential Habitat 

within the Analysis Area?

Habitat Unit used for 

Analysis

Segments Species 

may be Present In

SGCN / Wyoming

SGCN / Idaho

Northern Leopard 

Frog Rana pipiens Proposed

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.

Yes Wetland habitat mapped for 

the Northern Leopard Frog 4, 5, 7, 8, 9, 10

Wyoming Toad Bufo baxteri Endangered / WY - SGCN / Wyoming

The toad is historically found only in the Laramie Basin within 30 miles from Laramie, Wyoming. By the early 1990s a 

captured breeding program was commenced in an attempt to save the endangered toad from extinction, but no known 

wild reproduction has occurred since 1991. It formerly inhabited flood plains, ponds, and small seepage lakes in the 

shortgrass communities of the Laramie Basin.

No – The Analysis Area does not intercept historical or 

current distribution for this species. N/A N/A

Utah Valvata 

Snail 

Valvata 

utahensis Endangered / ID - SGCN / Idaho

Found primarily in the Snake River of Idaho, the Utah valvata snail prefers small pebbles and gravels, cobbles embedded 

in silt, and submerged aquatic vegetation but is found predominantly in silt substrates. The Utah valvata snail is known to 

range in the Snake River from RM 582 to the confluence of the South Fork and Henrys Fork, Snake River (RM 837). 

Yes – Project intersects Big Wood River and Snake River Big Wood River and Snake 

River 8, 10

Bliss Rapids 

Snail 

Taylorconcha 

serpenticola Threatened / ID - SGCN / Idaho The Bliss Rapids snail resides on the sides and undersides of rocks in free-flowing and cold-water springs in the middle 

Snake River, Idaho. It prefers relatively clean and rocky substrates so that it can graze on algae and diatoms at night. Yes – Project intersects middle Snake River Snake River 8

Idaho Springsnail 

Pyrgulopsis 

idahoensis (now 

Pyrgulopsis 

robusta )

Delisted / ID - - The Idaho springsnail is found in the middle Snake River, Idaho. It occupies various substrates in lake and river habitats 

of the middle Snake River, where it feeds on diatoms. Yes – Project intersects middle Snake River Snake River 8

Banbury Springs 

Limpet Lanx sp. Endangered / ID - SGCN / Idaho

The Banbury limpet requires cold, clear and well-oxygenated water with swift currents. The Banbury limpet are found on 

smooth basalt, boulders, or cobble-sized grounds ranging from 2 to 20 inches deep, but they avoid areas with green 

algae. Currently, this species only exists at four cold-spring locations that are isolated from each other: Thousand Springs, 

Box Canyon Springs, Briggs Springs and Banbury Springs.

Yes – Project intersects Snake River near Thousand 

Springs. Does not intersect Box Canyon Springs. Snake River 8

Snake River 

Physa Snail Physa natricina Endangered / ID - SGCN / Idaho

The Snake River physa snail is found in the middle Snake River of southern Idaho. It is believed to be confined to the 

Snake River, inhabiting areas of swift current on the undersides of large cobbles and boulder-sized rocks. Individuals 

have been found in relatively undisturbed areas with gravel, boulder, or cobble substrates and a low percentage of 

epiphytic algae or macrophytes

Yes – Project intersects middle Snake River Snake River 8, 10

Bruneau Hot 

Springsnail 

Pyrgulopsis 

bruneauensis Endangered / ID - SGCN / Idaho

The Bruneau hot springsnail occurs in thermal springs along an approximately 5 mile reach of the Bruneau River and in 

Hot Creek. The Bruneau hot springsnail inhabits small, geothermal spring runs and seeps, typically on basalt bedrock. 

Temperatures in these waters range from 15.7 to 36.9 degrees Celsius. Substrates usually comprise gravel and silt but 

individuals are also found on sand, mud, and algal film. Macrophytes are usually absent from occupied habitat.

Yes – Project intersects Bruneau River north of Hot Creek. Bruneau River 9

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. Threatened, Endangered, or Candidate Wildlife Species with the Potential to Occur within the Analysis Area cont.

Amphibians 

Permanent wetland and 

open water areas below 

9720 feet in elevation; 

delineated from vegetation 

mapping.

Columbia 

Spotted Frog – 

Great Basin 

Population only 

Rana 

luteiventris Candidate / ID

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 marshes. 

They prefer areas with thick algae and vegetation for cover, but may also hide under decaying vegetation. They most 

commonly occur in non-woody wetland plant communities. 

Yes – Permanent water bodies occur in most segments 

within the Analysis Area.

Invertebrates

4, 9
Gateway West Transmission Line Draft 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)

Big Brown Bat Eptesicus fuscus BLM sensitve (only in Nevada) - This species inhabits various wooded and semi-open habitats. Will generally roost in buildings, hollow trees, rock crevices, tunnels, and cliff faces.

Yes 

specie

Analys

BLM sensitive

Brazilian FreeTailed Bat Tadarida brasiliensis BLM sensitve (only in Nevada) - This species inhabits a wide variety of habitat types from deserts, woodlands, to forests. Will roost in buildings, rock crevices, tunnels, and cliff faces. 

FS sensitive (R4) SGCN / Wyoming

California Myotis Myotis californicus BLM sensitve (only in Nevada) - This species inhabits a wide variety of habitat types from deserts, woodlands, to forests. Will roost in buildings, shrubs, trees, or on the ground. Hibernates in caves, mines, tunnels, or buildings. Yes – 

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

Gunnison's prairie dog Cynomys gunnisoni FS sensitive (R2) - Basin-prairie shrub, grasslands: Habitat includes arid grassland and shrub/grassland communities. No – S

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.

Unli

occ

add

spec

habita

is unli

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 show 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

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)

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 show 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

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 and for cover. SGCN / Wyoming

No – T

this 

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

Fisher Martes pennanti

BLM sensitive

Fringed Myotis Myotis thysanodes

Yes – L

Table D.11-2 Page 1 of 13
Gateway West Transmission Line Draft 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

Hoary Bat Lasiurus cinereus BLM sensitve (only in Nevada) - This species typically inhabits deciduous and coniferous forests. Roosts in trees or rock crevices, but rarely uses caves. 

SGCN / Wyoming

FS sensitive (R2)

BLM sensitive

Little Brown Myotis Myotis lucifugus BLM sensitve (only in Nevada) - This species will inhabitat and roost in buildings, trees, and caves. 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

Long-Legged Myotis Myotis volans BLM sensitve (only in Nevada) - This species will inhabitat forests, riparian areas, and deserts. Will roost in buildings, rock crevices, trees. 

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

Pallid Bat Antrozous pallidus BLM sensitve (only in Nevada) - This species inhabits arid deserts and grasslands. Will roost in buildings or rock crevices, but rarely in trees or caves. 

FS sensitive (R2)

BLM sensitive

Preble's Shrew Sorex preblei BLM sensitve (only in Nevada) - This species inhabits a shrubland habitats and wetland-riparian areas. Yes – 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. 

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.

Pygmy Shrew Sorex hoyi FS sensitive (R2) 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

Kit Fox 

Myotis evotis BLM sensitive

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 

SGCN/ Idaho

Long-Eared Myotis 

Preble’s Meadow Jumping Mouse

Zapus hudsonius preblei

-

Yes – 

This species lives primarily in heavily vegetated, shrub-dominated riparian (streamside) habitats and immediately adjacent upland habitats along the foothills. The species occurs in southeastern Wyoming south to Colorado Springs along the eastern edge of the Front Range of Colorado. The species occurs in Albany, Laramie, Platte Goshen, and Converse counties in Wyoming (USFWS 2008b).

Yes – 

No – S

Yes – 

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. 

Mammals cont.Idaho Pocket Gopher

Thomomy idahoensis BLM sensitive

Table D.11-2 Page 2 of 13
Gateway West Transmission Line Draft 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

FS sensitive (R2, R4) SGCN / Wyoming

Small-Footed Myotis Myotis ciliolabrum BLM sensitve (only in Nevada) - This species typically inhabits dry arid and semi-arid habitats. Roosts in buildings, rock crevices, loose bark, under boulders, and caves. 

Silver-Haired Bat Lasionycteris noctivagans BLM sensitve (only in Nevada) - This species typically inhabits forested areas. Will roost in trees, but rarely buildings or caves. 

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

Western Pipistrelle 

Pipistrellus hesperus

BLM sensitve 

(only in Nevada) - This species inhabits deserts and scrublands. Roosts in buildings, caves, rock crevices, and under boulders. 

Western Red Bat Lasiurus blossevillii BLM sensitve (only in Nevada) - This species inhabits forested areas. Roosts in trees. No 

BLM sensitive

SGCN / Wyoming

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. Yes – 

SGCN/ Idaho

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.

Y

Corynorhinus townsendii BLM sensitive SGCN/ Idaho

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.

Yes 

specie

Analys

habita

b

Euderma maculatumCynomys leucurus

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.

Rocky Mountain Bighorn Sheep

Ovis canadensis canadensis

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 show 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 – 

SGCN/ Idaho

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.

BLM sensitive

Yes 

segme

Yes – 

BLM sensitive SGCN/ Idaho

FS sensitive (R2)FS sensitive (R2) SGCN / Wyoming

Swift Fox Vulpes veloxWater Vole Microtus richardsoniTownsend’s Bigeared BatMammals cont.

Table D.11-2 Page 3 of 13
Gateway West Transmission Line Draft 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

Yuma Myotis Myotis yumanensis BLM sensitve (only in Nevada) - This species inhabits a viariaty of habitats including deserts, riparian areas, woodlands, and forests. Roosts in buildings or caves. 

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 Rosy-Finch Leucosticte atrata BLM sensitve (only in Nevada) - This species inhabits shruby or grassy areas, which include cultivated farms and other areas near human habitation. Nests in rock crevices in cliffs or in buildings. 

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.

Bobolink Dolichonyx oryzivorus BLM sensitve (only in Nevada) - This species inhabits tall grassy areas, flooded meadows, prairies, and cultivated farmlnads. 

Mammals cont.

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. Y

BLM sensitive SGCN/ Idaho 

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

American White Pelican

Pelecanus erythrorhynchos BLM sensitive

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 

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 – 

BirdsAmerican Bittern Botaurus lentiginosus FS sensitive (R2)

Wyoming Pocket Gopher

SGCN / WyomingSGCN / 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 

FS sensitive (R2)

Table D.11-2 Page 4 of 13
Gateway West Transmission Line Draft 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 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

Gray Vireo Vireo vicinior BLM sensitve (only in Nevada) - This species inhabits semi-=arid shrublands. No – T

Greater PrairieChicken Tympanuchus cupido FS sensitive (R2) - This grassland species inhabits mid-tallgrass and tallgrass of the Great Plains region. No – T

Birds cont.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 

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 

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

Yes 

habit

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. Calcarius ornatus FS sensitive (R2) SGCN / Wyoming 

Columbian 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. 

Brewer’s Sparrow

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). Chestnut-Collared Longspur

Yes – 

are 

BLM sensitive SGCN/ Idaho 

Spizella breweri 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 – 

BLM sensitive SGCN/ Idaho

Boreal Owl Aegolius funereus FS sensitive (R2, R4)

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 

SGCN/ Idaho 5,000 ft. elevation. Hunting habitat includes forest meadows and open forests. 

Yes – 

Table D.11-2 Page 5 of 13
Gateway West Transmission Line Draft 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

Juniper Titmouse Baeolophus griseus BLM sensitve (only in Nevada) - This species inhabits pinyon-juniper woodlands. Yes – 

alog

Least Bittern Ixobrychus exilis BLM sensitve (only in Nevada) - This species inhabits wetland areas. Yes – 

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

Long-Eared Owl Asio otus BLM sensitve (only in Nevada) - This species will inhabit forests, orchards, and parks. Dense areas used for nesting, while open areas used for foraging. 

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). 

FS sensitive (R4)

BLM sensitive

BLM sensitive

SGCN/ Idaho

BLM sensitive

Birds cont.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

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

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 

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

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. 

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

Table D.11-2 Page 6 of 13
Gateway West Transmission Line Draft 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

MIS (Caribou and Medicine 

Bow NF)

FS sensitive (R2, R4)

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). 

Pinyon Jay Gymnorhinus cyanocephalus BLM sensitve (only in Nevada) - This species inhabits pinyon juniper and scrub oak woodlands. Yes – 

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, 

Red-Naped Sapsucker

Sphyrapicus nuchalis

BLM sensitve 

(only in Nevada) - This species inhabits forested areas adjacent to clearcuts and open areas. It is a cavity nester, that excavates holes in snags or live trees. 

FS sensitive (R2)

BLM sensitive

Sandhill Crane Grus canadensis BLM sensitve (only in Nevada) - This species inhabits open grasslands, marshes, marshy edges of lakes and ponds, and river banks. Will nest on the ground or in shallow water. During the nonbreeding season, this species roosts at night in shallow water along river channels, on alluvial islands of braided rivers, or in natural basin wetlands 

SGCN / Wyoming

SGCN/ Idaho

Birds cont.

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 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

Peregrine Falcon Falco peregrinus Tall cliffs: Nests near rocky cliffs and often hunts near water. 

BLM sensitive 

Yes 

Northern Goshawk 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

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.

Table D.11-2 Page 7 of 13
Gateway West Transmission Line Draft 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

Snowy Plover Charadrius alexandrinus BLM sensitve (only in Nevada) - This species will inhabit sandy shores of rivers, lakes, or ponds. The nest on the ground on broad beaches or mud flats. Yes – 

Swainson's Hawk Buteo swainsoni BLM sensitve (only in Nevada) - 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

Vesper Sparrow Pooecetes gramineus BLM sensitve (only in Nevada) This species inhabits open areas such as grasslands, shrublands, and farmlands. 

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 communitiesor willow woodlands located near the edges of beaver ponds and lakes, riparian zones, fens, bogs and overgrown clear-cuts. 

Yellow-Breasted Chat Icteria virens BLM sensitve (only in Nevada) - This species inhabits open areas such as grasslands, shrublands, and fencerows; often located near human habitations 

BLM sensitive SGCN/ Idaho

Birds cont.

Willow Flycatcher 

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

Picoides albolarvatus

SGCN/ Idaho

BLM sensitive SGCN / Wyoming

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). SGCN/ Idaho

Ye

Three-Toed Woodpecker Picoides dorsalis

No 

White-faced Ibis 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.

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 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

Table D.11-2 Page 8 of 13
Gateway West Transmission Line Draft 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

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; Brown; Rainbow)

- MIS (Medicine Bow NF) - Found in cold waters of the Yampa, North Platte, 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

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;

Independence Valley Tui Chub Gila bicolor euchila BLM sensitve (only in Nevada) - Found in slow moving freashwater marshes wihtin Elko County, Nevada. No – 

SGCN / WyomingSGCN / 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 boarder. 

Introduced populations can also be found within the Colorado River system.

Yes 

abov

Creek, 

popula

Fish

Catostomus discobolus

SGCN / Idaho

Nocomis biguttatus Catostomus platyrhynchus

Yes – 

Couesius plumbeus 

Mountain 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. 

Found in small to medium sized streams, with gravel and rock substrates, and warm waters with abundant aquatic vegetation.Bear, Snake and Green drainages, clear, cool streams and pools having water temperatures between 60 and 75 °F.Found in glacial scour lakes and rivers with clear water and gravel bottoms. 

SGCN / Wyoming

SGCN / Idaho

Gila copei SGCN / Idaho

FS sensitive (R2)

Leatherside Chub BLM sensitiveLake ChubHornyhead Chub

FS sensitive (R2)

BLM sensitive

Fine-spotted Cutthrout Trout, Snake River Cutthroat

BLM sensitive

Oncorhynchus clarki spp SGCN / Idaho Snake River drainage, clear, fast water 

Oncorhynchus clarki pleuriticus

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.

Colorado River Cutthroat Trout SGCN / Wyoming Clear mountain streams along the Colorado River drainages located above the Grand Canyon; including the green river 

Flathead Chub

FS sensitve (R4)

BLM sensitive

Platygobio gracilis

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 

Oncorhynchus clarki utah

Table D.11-2 Page 9 of 13
Gateway West Transmission Line Draft 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 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. 

Relict Dace Relictus solitarius BLM sensitve (only in Nevada) - Found in springs brooks, lakes, and reservoirs. No 

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 Unlik

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. 

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.

Westslope Cutthroat Trout 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.

Oncorhynchus clarki lewisi 

FS sensitive (R2)

Fish cont.

Roundtail ChubPlains Minnow FS sensitive (R2) SGCN / Wyoming Found along the channels of shallow, fluctuating streams with shifting sand substrates.Pearl Dace

SGCN / Wyoming Found in slow moving, spring fed streams with well vegetated banks, and a diverse system of pool habitats. Margariscus margaritaSGCN / 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.

Gila robustaHybognathus placitus

Yes 

Table D.11-2 Page 10 of 13
Gateway West Transmission Line Draft 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

Reptiles

FS sensitive (R2, R4) SGCN / Wyoming

Common 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

Short-Horned Lizard

Phrynosoma douglassii; Phrynosoma hernandesi

BLM sensitve 

(only in Nevada)

-

This species can inhabit areas ranging from semiarid plains to high mountains, usually t in open, shrubby, or openly wooded areas with sparse vegetation at ground level

Yes 

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 – 

Mountain YellowLegged Frog Rana muscosa FS sensitive (R4) - Found in wetland habitats within mountain areas of California and Nevada. 

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. 

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.

Amphibians

Yellowstone, Bighorn, and Snake River drainage, small mountain streams and large rivers (including Raft River, Goose Creek, Piney Creek, and Trout Creek) 

Bufo boreas boreas SGCN / Wyoming 

Black Hills Redbelly Snake FS sensitive (R2) SGCN / Wyoming This species inhabits mountainous or hilly woodlands in the Black Hills. It is commonly found under rocks and logs in moist areas. 

Storeria occipitomaculata pahasapae

No – In 

Yellowstone Cutthroat Trout Oncorhynchus clarki bouvieri

BLM sensitive SGCN / Idaho

Table D.11-2 Page 11 of 13
Gateway West Transmission Line Draft 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

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 if 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

Grey's Silverspot Speyeria hesperis greyi BLM sensitve (only in Nevada) - This species distribution is limited to the Ruby Mountains and East Humboldt Range, in Elko County, Nevada. 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

N

Humboldt Pyrg Pyrgulopsis humboldtensis BLM sensitve (only in Nevada) - Inhabits springs within Elko County NV, which contain aquatic vegetation. Watersheds where this species occurs in Elko county include Upper Humboldt and North Fork Humboldt. No – 

analys

Large-Gland Carico Pyrg

Pyrgulopsis basiglans

BLM sensitve 

(only in Nevada)

-

Inhabits springs within Elko County NV, which contain aquatic vegetation. This species occurs in the Middle Humbolt watershed in Elko County.

No – 

analys

Spotted Frog

Yes – 

Amphibians cont.

Woodhouse Toad BLM sensitive 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.

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 

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 – 

Table D.11-2 Page 12 of 13
Gateway West Transmission Line Draft 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

Mattoni's Blue Euphilotes pallescens mattonii BLM sensitve (only in Nevada) -

This species is endemic to Nevada, and is known to occur in Pilot-ThousandSprings, Long-Ruby Valleys and Bruneau watersheds in Elko County. It is dependent on slender buckwheat (Eriogonum microthecum laxiflorum) in that females lay eggs upon young flowers and larvae feed on pollen and developing seeds. Slender buckwheat grows in 

mountain habitats above approximately 4,900 feet in elevation.

Poten

Sprin

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 Moutains; 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 

Schell Creek Mountainsnail

Oreohelix nevadensis

BLM sensitve 

(only in Nevada)

-

Inhabits springs within Elko County NV, which contain aquatic vegetation. This species occurs in the Spring-Steptoe Valley watershed in Elko County.

No – 

analys

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 

Transverse Gland Pyrg

Pyrgulopsis cruciglans

BLM sensitve 

(only in Nevada)

-

Inhabits springs within Elko County NV, which contain aquatic vegetation. This species occurs in the Spring-Steptoe Valley watershed in Elko County.

No – 

analys

Vinyards Pyrg Pyrgulopsis vinyardi BLM sensitve (only in Nevada) - Inhabits springs within Elko County NV, which contain aquatic vegetation. This species occurs in the Rock watershed in Elko County. No – 

analys

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 13 of 13
Gateway West Transmission Line Draft 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

Proposed – Total Length 100.6 62.0 Proposed – Comparison portion for Alternative 1E-A 17.6 9.7 Alternative 1E-A 16.1 6.9 Proposed – Comparison portion for Alternative 1E-B 37.9 27.8 Alternative 1E-B 59.3 39.7 Proposed – Comparison portion for Alternative 1E-C 75.4 49.3 Alternative 1E-C 48.7 35.5 1W(a) Proposed – Total Length 76.5 45.7 

Proposed – Comparison portion for Alternative 1W-A 20.3 8.7 Alternative 1W-A 16.2 5.5 1W(c) Proposed – Total Length 70.6 42.3 Proposed – Total Length 96.7 14.5 86.0 Proposed – Comparison portion for Alternative 2A 28.8 24.4 Alternative 2A 28.4 24.9 Proposed – Comparison portion for Alternative 2B 7.0 6.1 Alternative 2B 6.2 5.0 Proposed – Comparison portion for Alternative 2C 28.4 25.5 Alternative 2C 24.4 23.7 

3 Proposed – Total Length 56.5 17.6 44.7 

Proposed – Total Length 203.0 41.7 10.3 1.5 144.0 Proposed – Comparison portion for Alternatives 4A-4F 90.2 29.8 10.3 1.5 69.7 Alternative 4A 85.2 24.4 2.3 69.1 Alternative 4B 100.2 30.1 1.3 85.3 Alternative 4C 101.6 30.1 0.7 83.2 Alternative 4D 100.8 30.1 1.2 84.9 Alternative 4E 102.2 30.1 0.6 82.8 Alternative 4F 87.5 24.4 4.5 1.8 69.1 Proposed – Total Length 54.6 25.3 Proposed – Comparison portion for Alternatives 5A,B 25.3 10.5 Alternative 5A 33.7 17.8 Alternative 5B 44.4 20.8 Proposed – Comparison portion for Alternative 5C 33.2 16.1 Alternative 5C 26.1 12.9 Proposed – Comparison portion for Alternative 5D 19.4 10.4 Alternative 5D 17.5 4.6 Proposed – Comparison portion for Alternative 5E 5.8 1.7 Alternative 5E 5.3 0.9 

6 Proposed – Total Length 0.5 0.5 

Note: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactly

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

Segment Length 

(Miles)

Miles of Ha

2

1E

1W

4

Proposed or Alternative Name

5

Segment 

Number

Table D.11-3 Page 1 of 2
Gateway West Transmission Line Draft 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 118.1 43.4 Proposed – Comparison portion for Alternatives 7A,B 35.2 11.1 Alternative 7A 38.0 17.2 

Alternative 7B 46.4 22.8 Proposed – Comparison portion for Alternative 7C 20.1 7.6 Alternative 7C 20.3 6.0Proposed – Comparison portion for Alternative 7D 6.2 3.1 Alternative 7D 6.8 2.6 Proposed – 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 8.3Proposed – Comparison portion for Alternative 7G 3.1 2.4Alternative 7G 3.2 0.3Proposed – Comparison portion for Alternatives 7H,I 118.1 43.4 Alternative 7H 127.5 84.5 Alternative 7I 173.4 106.4 Proposed – Comparison portion 7/9 for Alternative 7J 2/ 143.9 58.8 Alternative 7J2/ 202.1 137.2 

Proposed – Total Length 131.0 t1/ 73.6 

Proposed – Comparison portion for Alternative 8A 51.4 30.2 Alternative 8A 53.6 25.6 Proposed – Comparison portion for Alternative 8B 45.3 t1/ 22.2 

Alternative 8B 45.8 0.2 16.9 

Proposed – Comparison portion for Alternative 8C 6.5 3.6 Alternative 8C 6.4 3.2Proposed – Comparison portion for Alternative 8D 6.9 2.7Alternative 8D 8.1 2.3Proposed – Comparison portion for Alternative 8E 7.0 2.8 Alternative 8E 18.5 0.1 9.7 Proposed – Total Length 161.7 0.6 102.9 Proposed – Comparison portion for Alternative 9A 7.8 3.7 Alternative 9A 7.7 5.1 Proposed – Comparison portion for Alternative 9B 49.5 t1/ 39.4 Alternative 9B 53.2 23.4 Proposed – Comparison portion for Alternative 9C 14.7 13.8 Alternative 9C 15.3 9.57 Proposed – Comparison portion for Alternatives 9D-9H 57.2 0.6 29.7 Alternative 9D 58.4 0.3 28.7 Alternative 9E 68.7 0.2 49.3 Alternative 9F 62.9 0.5 30.5 Alternative 9G 56.4 0.3 28.3 Alternative 9H 61.0 0.5 30.1 

10 Proposed – Total Length 33.6 6.9 

Note: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactly

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

2/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for S

portion of Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 7 of the Proposed 

Miles of Ha

Proposed or Alternative Name

Segment Length 

(Miles)

Segment 

Number

987

Table D.11-3 Page 2 of 2
Gateway West Transmission Line Draft EIS

Table D.11-4. Miles of Habitat Crossed for BLM and Forest Service Sensitive Species with Available Quantitative Data

Proposed – Total Length 100.6 2.7 3.8 19.0 67.7 Proposed – Comparison portion for Alternative 1E-A 17.6 2.7 2.7 17.1 15.5 Alternative 1E-A 16.1 2.0 6.6 1.4 10.4 14.1 Proposed – Comparison portion for Alternative 1E-B 37.9 34.0 Alternative 1E-B 59.3 41.5 Proposed – Comparison portion for Alternative 1E-C 75.4 50.5 Alternative 1E-C 48.7 36.0 1W(a) Proposed – Total Length 76.5 2.0 1.7 22.2 57.5 Proposed – Comparison portion for Alternative 1W-A 20.3 2.0 1.1 19.9 17.2 Alternative 1W-A 16.2 1.9 6.3 2.3 11.8 14.0 1W(c) Proposed – Total Length 70.6 1.9 6.8 3.0 9.9 50.0 Proposed – Total Length 96.7 66.4 Proposed – Comparison portion for Alternative 2A 28.8 16.1 Alternative 2A 28.4 1.9 21.5 Proposed – Comparison portion for Alternative 2B 7.0 5.3 Alternative 2B 6.2 2.0 3.4 Proposed – Comparison portion for Alternative 2C 28.4 15.2 Alternative 2C 24.4 19.4 

3 Proposed – Total Length 56.5 37.2 

Proposed – Total Length 203.0 2.0 108.1 61.8 Proposed – Comparison portion for Alternatives 4A-4F 90.2 52.2 6.5 Alternative 4A 85.2 48.7 6.5 Alternative 4B 100.2 69.2 8.2 Alternative 4C 101.6 75.0 8.2 Alternative 4D 100.8 66.2 8.2 Alternative 4E 102.2 72.0 8.2 Alternative 4F 87.5 52.3 6.5 Proposed – Total Length 54.6 1.6 t2/ 22.7 50.6 

Proposed – Comparison portion for Alternatives 5A,B 25.3 0.0 9.6 25.1 Alternative 5A 33.7 0.0 14.3 33.6 Alternative 5B 44.4 0.0 23.0 43.5 Proposed – Comparison portion for Alternative 5C 33.2 0.0 11.1 32.9 Alternative 5C 26.1 0.0 14.9 26.1 Proposed – Comparison portion for Alternative 5D 19.4 1.6 t2/ 6.0 17.5 

Alternative 5D 17.5 1.7 t2/ 8.3 16.2 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 

Note: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactly

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 cro2/ "t" indicates only a trace amount (<0.1 mile) crossed

5

w

Bald Eagle Black-Tailed Prairie Dog

Burrowing 

Owl

Columbian 

Sharp-Tailed 

Grouse

Segment 

Number Proposed or Alternative Name

Segment 

Length 

(Miles)

Miles of Habitat Crossed

Within a 1-

mile Nest 

Buffer

Within a 1-

mile Winter 

Roost Buffer colony complex1/

2

1E

1W

4

Table D.11-4 Page 1 of 2
Gateway West Transmission Line Draft EIS

Table D.11-4. Miles of Habitat Crossed for BLM and Forest Service Sensitive Species with Available Quantitative Data cont.

Proposed – Total Length 118.1 68.6 76.9 Proposed – Comparison portion for Alternatives 7A,B 35.2 19.7 35.0 Alternative 7A 38.0 18.3 35.4 Alternative 7B 46.4 26.1 46.2 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 4.1 Proposed – Comparison portion for Alternative 7G 3.1 1.7 2.7 Alternative 7G 3.2 2.1 2.5 Proposed – Comparison portion for Alternatives 7H,I 118.1 68.6 76.2 Alternative 7H 127.5 65.8 88.5 Alternative 7I 173.4 81.6 115.4 Proposed – Comparison portion 7/9 for Alternative 7J3/ 143.9 90.8 78.6 

Alternative 7J3/ 202.1 113.0 127.4 

Proposed – Total Length 131.0 111.2 Proposed – Comparison portion for Alternative 8A 51.4 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 18.5 t2/ 16.8 Proposed – Total Length 161.7 131.1 1.8 Proposed – Comparison portion for Alternative 9A 7.8 7.6 Alternative 9A 7.7 7.0 Proposed – Comparison portion for Alternative 9B 49.5 46.7 Alternative 9B 53.2 41.5 Proposed – Comparison portion for Alternative 9C 14.7 13.4 Alternative 9C 15.3 14.3 Proposed – Comparison portion for Alternatives 9D-9H 57.2 40.3 Alternative 9D 58.4 t2/ 51.7 Alternative 9E 68.7 52.3 Alternative 9F 62.9 t2/ 50.4 Alternative 9G 56.4 t2/ 51.1 Alternative 9H 61.0 t2/ 49.8 

10 Proposed – Total Length 33.6 t2/ 16.7 

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 cro2/ "t" indicates only a trace amount (<0.1 mile) crossed

3/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for Segment 9. 

Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 7 of the Proposed Route (118.1 miles) Note: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactly

Columbian 

Sharp-Tailed 

Grouse

w

colony complex 

1/

Miles of Habitat Crossed

Segment 

Number Proposed or Alternative Name

Segment 

Length 

(Miles)

Bald Eagle Black-Tailed Prairie Dog

Burrowing 

Owl

Within a 1-

mile Nest 

Buffer

Within a 1-

mile Winter 

Roost Buffer

987

Table D.11-4 Page 2 of 2
Gateway West Transmission Line Draft EIS

Table D.11-5. Acres of Construction Impacts for Federal ESA Wildlife Species with Available Quantitative Data

Black-Footed Ferret Canada Lynx Columbia Spotted Frog

Proposed – Total Length 100.6 Proposed – Comparison portion for Alternative 1E-A 17.6 Alternative 1E-A 16.1 Proposed – Comparison portion for Alternative 1E-B 37.9 Alternative 1E-B 59.3 Proposed – Comparison portion for Alternative 1E-C 75.4 Alternative 1E-C 48.7 1W(a) Proposed – Total Length 76.5 Proposed – Comparison portion for Alternative 1W-A 20.3 Alternative 1W-A 16.2 1W(c) Proposed – Total Length 70.6 Proposed – Total Length 96.7 232 Proposed – Comparison portion for Alternative 2A 28.8 Alternative 2A 28.4 Proposed – Comparison portion for Alternative 2B 7.0 Alternative 2B 6.2 Proposed – Comparison portion for Alternative 2C 28.4 Alternative 2C 24.4 

3 Proposed – Total Length 56.5 222 

Proposed – Total Length 203.0 549 302 9 Proposed – Comparison portion for Alternatives 4A-4F 90.2 408 302 9 Alternative 4A 85.2 328 52 Alternative 4B 100.2 443 36 Alternative 4C 101.6 443 28 Alternative 4D 100.8 443 32 Alternative 4E 102.2 443 28 Alternative 4F 87.5 321 121 35 Proposed – Total Length 54.6 Proposed – Comparison portion for Alternatives 5A,B 25.3 Alternative 5A 33.7 Alternative 5B 44.4 Proposed – Comparison portion for Alternative 5C 33.2 Alternative 5C 26.1 Proposed – Comparison portion for Alternative 5D 19.4 Alternative 5D 17.5 Proposed – Comparison portion for Alternative 5E 5.8 Alternative 5E 5.3 

6 Proposed – Total Length 0.5 

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

Segment 

Number Proposed or Alternative Name

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

1E

1W

Segment Length 

(Miles)

24

Acres of Co

5

Table D.11-5 Page 1 of 2
Gateway West Transmission Line Draft EIS

Table D.11-5. Acres of Construction Impacts for Federal ESA Wildlife Species with Available Quantitative Data cont.

Black-Footed Ferret Canada Lynx Columbia Spotted Frog

Proposed – Total Length 118.1 Proposed – Comparison portion for Alternatives 7A,B 35.2 

Alternative 7A 38.0 Alternative 7B 46.4 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 3.1 Alternative 7G 3.2 Proposed – Comparison portion for Alternatives 7H,I 118.1 Alternative 7H 127.5 Alternative 7I 173.4 Proposed – Comparison portion 7/9 for Alternative 7J 2/ 143.9 Alternative 7J2/ 202.1 Proposed – Total Length 131.0 <1 Proposed – Comparison portion for Alternative 8A 51.4 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 18.5 <1 Proposed – Total Length 161.7 4 Proposed – Comparison portion for Alternative 9A 7.8 Alternative 9A 7.7 Proposed – Comparison portion for Alternative 9B 49.5 t1/ 

Alternative 9B 53.2 Proposed – Comparison portion for Alternative 9C 14.7 Alternative 9C 15.3 Proposed – Comparison portion for Alternatives 9D-9H 57.2 4 Alternative 9D 58.4 <1 

Alternative 9E 68.7 2 Alternative 9F 62.9 5 Alternative 9G 56.4 <1 Alternative 9H 61.0 5 

10 Proposed – Total Length 33.6 

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

987

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

2/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for S

of Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 7 of the Proposed Route (

Segment 

Number Proposed or Alternative Name

Segment Length 

(Miles)

Acres of Co

Table D.11-5 Page 2 of 2
Gateway West Transmission Line Draft 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/

Within a 

mile Nes

Buffer

Proposed – Total Length 100.6 22 38 202 795 16 Proposed – Comparison portion for Alternative 1E-A 17.6 22 33 192 189 Alternative 1E-A 16.1 12 53 14 80 108 Proposed – Comparison portion for Alternative 1E-B 37.9 340 Alternative 1E-B 59.3 538 Proposed – Comparison portion for Alternative 1E-C 75.4 597 16 Alternative 1E-C 48.7 223 9 1W(a) Proposed – Total Length 76.5 14 15 225 463 11 Proposed – Comparison portion for Alternative 1W-A 20.3 14 11 209 179 Alternative 1W-A 16.2 11 47 19 107 119 1W(c) Proposed – Total Length 70.6 21 72 29 139 616 11 Proposed – Total Length 96.7 <1 1113 Proposed – Comparison portion for Alternative 2A 28.8 <1 236 Alternative 2A 28.4 26 340 Proposed – Comparison portion for Alternative 2B 7.0 <1 70 Alternative 2B 6.2 28 44 Proposed – Comparison portion for Alternative 2C 28.4 219 Alternative 2C 24.4 262 

3 Proposed – Total Length 56.5 601 

Proposed – Total Length 203.0 18 1536 861 38 Proposed – Comparison portion for Alternatives 4A-4F 90.2 697 83 Alternative 4A 85.2 683 84 Alternative 4B 100.2 1019 119 Alternative 4C 101.6 1068 118 Alternative 4D 100.8 994 119 Alternative 4E 102.2 1029 115 Alternative 4F 87.5 710 86 Proposed –Total Length 54.6 28 469 891 Proposed – Comparison portion for Alternatives 5A,B 25.3 190 427 Alternative 5A 33.7 264 546 Alternative 5B 44.4 369 673 Proposed – Comparison portion for Alternative 5C 33.2 239 575 Alternative 5C 26.1 287 430 Proposed – Comparison portion for Alternative 5D 19.4 28 153 352 Alternative 5D 17.5 21 174 323 Proposed – Comparison portion for Alternative 5E 5.8 28 72 91 Alternative 5E 5.3 <1 45 60 

6 Proposed – Total Length 0.5 42 16 

Note: 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 impacte2/ "t" indicates only a trace amount (<0.1 acre) of impact

5

Burrowing 

Owl

Columbian 

Sharp-Tailed 

Grouse

Northern 

Goshaw

1W

4

1E

Segment 

Number Proposed or Alternative Name

Segment 

Length 

(Miles)

Acres of Habitat Impacted by Construction 

Bald Eagle Black-Tailed Prairie Dog

2

Table D.11-6 Page 1 of 2
Gateway West Transmission Line Draft 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/

Within a 

mile Nes

Buffer

Proposed – Total Length 118.1 1025 1067 Proposed – Comparison portion for Alternatives 7A,B 35.2 311 493 Alternative 7A 38.0 337 592 Alternative 7B 46.4 456 735 Proposed – Comparison portion for Alternative 7C 20.1 223 232 Alternative 7C 20.3 263 278 Proposed – Comparison portion for Alternative 7D 6.2 66 28 Alternative 7D 6.8 79 40 Proposed – Comparison portion for Alternative 7E 3.8 25 Alternative 7E 4.5 26 Proposed – Comparison portion for Alternative 7F 10.5 89 Alternative 7F 10.8 85 Proposed – Comparison portion for Alternative 7G 3.1 30 41 Alternative 7G 3.2 46 56 Proposed – Comparison portion for Alternatives 7H,I 118.1 1025 1067 Alternative 7H 127.5 1174 1444 Alternative 7I 173.4 1395 1893 6 Proposed – Comparison portion 7/9 for Alternative 7J3/ 143.9 1330 1093 

Alternative 7J3/ 202.1 1830 2068 Proposed – Total Length 131.0 1797 Proposed – Comparison portion for Alternative 8A 51.4 591 Alternative 8A 53.6 594 Proposed – Comparison portion for Alternative 8B 45.3 665 Alternative 8B 45.8 495 Proposed – Comparison portion for Alternative 8C 6.5 135 Alternative 8C 6.4 107 Proposed – Comparison portion for Alternative 8D 6.9 118 Alternative 8D 8.1 126 Proposed – Comparison portion for Alternative 8E 7.0 76 Alternative 8E 18.5 268 Proposed – Total Length 161.7 2083 26 Proposed – Comparison portion for Alternative 9A 7.8 100 Alternative 9A 7.7 111 Proposed – Comparison portion for Alternative 9B 49.5 743 Alternative 9B 53.2 593 Proposed – Comparison portion for Alternative 9C 14.7 221 Alternative 9C 15.3 189 Proposed – Comparison portion for Alternatives 9D-9H 57.2 649 Alternative 9D 58.4 733 Alternative 9E 68.7 844 Alternative 9F 62.9 <1 784 Alternative 9G 56.4 <1 763 Alternative 9H 61.0 <1 794 

10 Proposed – Total Length 33.6 254 

Note: 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 impacte2/ "t" indicates only a trace amount (<0.1 acre) of impact

3/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for Segment 9. The 

portion of Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 7 of the Proposed Route (118.1 m

Segment 

Number Proposed or Alternative Name

Segment 

Length 

(Miles)

Columbian 

Sharp-Tailed 

Grouse

987

Acres of Habitat Impacted by Construction 

Northern 

Goshaw

Bald Eagle Black-Tailed Prairie Dog

Burrowing 

Owl

Table D.11-6 Page 2 of 2
Gateway West Transmission Line Draft EIS

Table D.11-7. Acres of Habitat Occupancy during Operations for Federal ESA Wildlife Species with Available Quantitative Data

Black-Footed Ferret Canada Lynx 

Columbia Spotted 

Frog

Greater 

Grou

Proposed –Total Length 100.6 186 Proposed – Comparison portion for Alternative 1E-A 17.6 29 

Alternative 1E-A 16.1 18 Proposed – Comparison portion for Alternative 1E-B 37.9 68 Alternative 1E-B 59.3 109 Proposed – Comparison portion for Alternative 1E-C 75.4 150 Alternative 1E-C 48.7 70 1W(a) Proposed – Total Length 76.5 119 Proposed – Comparison portion for Alternative 1W-A 20.3 22 Alternative 1W-A 16.2 14 1W(c) Proposed – Total Length 70.6 95 Proposed –Total Length 96.7 39 365 Proposed – Comparison portion for Alternative 2A 28.8 63 Alternative 2A 28.4 78 Proposed – Comparison portion for Alternative 2B 7.0 14 Alternative 2B 6.2 14 Proposed – Comparison portion for Alternative 2C 28.4 69 Alternative 2C 24.4 51 

3 Proposed –Total Length 56.5 52 184 

Proposed –Total Length 203.0 113 233 2 486 Proposed – Comparison portion for Alternatives 4A-4F 90.2 85 233 2 203 Alternative 4A 85.2 72 6 232 Alternative 4B 100.2 111 3 295 Alternative 4C 101.6 111 2 284 Alternative 4D 100.8 111 3 297 Alternative 4E 102.2 111 2 283 Alternative 4F 87.5 72 91 3 227 Proposed – Total Length 54.6 100 

Proposed – Comparison portion for Alternatives 5A,B 25.3 34 Alternative 5A 33.7 44 Alternative 5B 44.4 50 Proposed – Comparison portion for Alternative 5C 33.2 42 Alternative 5C 26.1 30 Proposed – Comparison portion for Alternative 5D 19.4 35 Alternative 5D 17.5 23 Proposed – Comparison portion for Alternative 5E 5.8 17 Alternative 5E 5.3 16 

6 Proposed – Total Length 0.5 39 

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

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

Proposed or Alternative Name

Segment Length 

(Miles)

Acres of Operat

24

1E

1W

Segment 

Number

5

Table D.11-7 Page 1 of 2
Gateway West Transmission Line Draft EIS

Table D.11-7. Acres of Habitat Occupancy during Operations for Federal ESA Wildlife Species with Available Quantitative Data cont.

Black-Footed Ferret Canada Lynx 

Columbia Spotted 

Frog

Greater 

Grou

Proposed – Total Length 118.1 96 

Proposed – Comparison portion for Alternatives 7A,B 35.2 14 Alternative 7A 38.0 44 Alternative 7B 46.4 51 Proposed – Comparison portion for Alternative 7C 20.1 14 Alternative 7C 20.3 8Proposed – Comparison portion for Alternative 7D 6.2 4 Alternative 7D 6.8 4 Proposed – Comparison portion for Alternative 7E 3.8 4Alternative 7E 4.5 7Proposed – Comparison portion for Alternative 7F 10.5 13 Alternative 7F 10.8 15 Proposed – Comparison portion for Alternative 7G 3.1 3 Alternative 7G 3.2 0 Proposed – Comparison portion for Alternatives 7H,I 118.1 96 Alternative 7H 127.5 227 Alternative 7I 173.4 291 Proposed – Comparison portion 7/9 for Alternative 7J 2/ 143.9 126 Alternative 7J2/ 202.1 355 Proposed – Total Length 131.0 t1/ 144 

Proposed – Comparison portion for Alternative 8A 51.4 65 Alternative 8A 53.6 59 

Proposed – Comparison portion for Alternative 8B 45.3 t1/ 44 

Alternative 8B 45.8 t1/ 34 Proposed – Comparison portion for Alternative 8C 6.5 9 

Alternative 8C 6.4 8 Proposed – Comparison portion for Alternative 8D 6.9 7Alternative 8D 8.1 4Proposed – Comparison portion for Alternative 8E 7.0 4Alternative 8E 18.5 14Proposed – Total Length 161.7 <1 209 Proposed – Comparison portion for Alternative 9A 7.8 7 Alternative 9A 7.7 10 Proposed – Comparison portion for Alternative 9B 49.5 84 Alternative 9B 53.2 40 Proposed – Comparison portion for Alternative 9C 14.7 24Alternative 9C 15.3 18Proposed – Comparison portion for Alternatives 9D-9H 57.2 <1 54 Alternative 9D 58.4 38 Alternative 9E 68.7 <1 86 Alternative 9F 62.9 <1 44 Alternative 9G 56.4 <1 39 Alternative 9H 61.0 <1 45 

10 Proposed – Total Length 33.6 27 

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

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

2/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for S

portion of Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 7 of the Proposed 

98

Acres of Operat

Proposed or Alternative Name

Segment Length 

(Miles)

7

Segment 

Number

Table D.11-7 Page 2 of 2
Gateway West Transmission Line Draft EIS

Table D.11-8. Acres of Operation Impacts to BLM and Forest Service Sensitive Species with Available Quantitative Data

N

G

Proposed – Total Length 100.6 7 7 46 191 Proposed – Comparison portion for Alternative 1E-A 17.6 7 5 44 44 

Alternative 1E-A 16.1 4 17 4 22 34 Proposed – Comparison portion for Alternative 1E-B 37.9 78 Alternative 1E-B 59.3 120 Proposed – Comparison portion for Alternative 1E-C 75.4 145 Alternative 1E-C 48.7 63 1W(a) Proposed – Total Length 76.5 4 5 52 126 Proposed – Comparison portion for Alternative 1W-A 20.3 4 3 47 38 Alternative 1W-A 16.2 3 13 6 32 35 1W(c) Proposed – Total Length 70.6 4 14 5 17 104 Proposed – Total Length 96.7 <1 288 Proposed – Comparison portion for Alternative 2A 28.8 <1 45 Alternative 2A 28.4 7 67 Proposed – Comparison portion for Alternative 2B 7.0 <1 12 

Alternative 2B 6.2 6 11 Proposed – Comparison portion for Alternative 2C 28.4 45 Alternative 2C 24.4 42 

3 Proposed – Total Length 56.5 161 

Proposed – Total Length 203.0 4 353 192 Proposed – Comparison portion for Alternatives 4A-4F 90.2 143 16 Alternative 4A 85.2 151 17 Alternative 4B 100.2 248 25 Alternative 4C 101.6 253 25 Alternative 4D 100.8 241 26 Alternative 4E 102.2 244 24 Alternative 4F 87.5 158 18 Proposed – Total Length 54.6 1 87 163 Proposed – Comparison portion for Alternatives 5A,B 25.3 26 72 Alternative 5A 33.7 31 84 Alternative 5B 44.4 45 96 Proposed – Comparison portion for Alternative 5C 33.2 28 92 Alternative 5C 26.1 32 55 Proposed – Comparison portion for Alternative 5D 19.4 1 26 56 Alternative 5D 17.5 3 34 47 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 

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 im2/ "t" indicates only a trace amount (<0.1 acre) of impact

Within a 1-

mile Winter 

Roost Buffer Complex1/

Within a 1-

mile Nest 

Buffer

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

Columbian 

Sharp-Tailed 

Grouse

Acres of Habitat Impacted by Op

Black-Tailed Prairie Dog

Burrowing 

Owl

1E

42

1W

Colony 

Bald Eagle

W

m

Segment 

Number Proposed or Alternative Name

5

Segment 

Length 

(Miles)

Table D.11-8 Page 1 of 2
Gateway West Transmission Line Draft EIS

Table D.11-8. Acres of Operation Impacts to BLM and Forest Service Sensitive Species with Available Quantitative Data cont.

N

G

Proposed – Total Length 118.1 134 141 Proposed – Comparison portion for Alternatives 7A,B 35.2 25 45 Alternative 7A 38.0 37 90 Alternative 7B 46.4 47 96 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 12 Alternative 7F 10.8 12 Proposed – Comparison portion for Alternative 7G 3.1 3 4 Alternative 7G 3.2 3 3 Proposed – Comparison portion for Alternatives 7H,I 118.1 134 141 Alternative 7H 127.5 182 237 Alternative 7I 173.4 218 322 Proposed – Comparison portion for Alternative 7J 143.9 176 143 Alternative 7J 202.1 273 366 Proposed – Total Length 131.0 213 Proposed – Comparison portion for Alternative 8A 51.4 77 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 16 Alternative 8D 8.1 12 Proposed – Comparison portion for Alternative 8E 7.0 8 Alternative 8E 18.5 25 Proposed – Total Length 161.7 291 3 Proposed – Comparison portion for Alternative 9A 7.8 13 Alternative 9A 7.7 16 Proposed – Comparison portion for Alternative 9B 49.5 116 Alternative 9B 53.2 70 Proposed – Comparison portion for Alternative 9C 14.7 23 Alternative 9C 15.3 25 Proposed – Comparison portion for Alternatives 9D-9H 57.2 76 Alternative 9D 58.4 71 Alternative 9E 68.7 112 Alternative 9F 62.9 76 Alternative 9G 56.4 74 Alternative 9H 61.0 79 

10 Proposed – Total Length 33.6 37 

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 im2/ "t" indicates only a trace amount (<0.1 acre) of impact

3/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for Segment 9. 

portion of Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 7 of the Proposed Route (118

Complex1/

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

Bald Eagle

987

Within a 1-

mile Nest 

Proposed or Alternative Name Buffer

Within a 1-

mile Winter 

Roost Buffer

Segment 

Length 

(Miles)

Acres of Habitat Impacted by Op

Segment 

Number

Colony 

W

m

Columbian 

Sharp-Tailed 

Grouse

Black-Tailed Prairie Dog

Burrowing 

Owl

Table D.11-8 Page 2 of 2
Gateway West Transmission Line Draft EIS

Table D.11-9. Number of Greater Sage-Grouse Leks within Specified Distances from Route Centerlines

Occupied1/ Undetermined Occupied1/ Undetermined Occupied1/ Undetermined Occupied1/ Undete

Proposed – Total Length 100.6 1 1 3 5 3 Proposed – Comparison portion for Alternative 1E-A 17.6 1 2 2 Alternative 1E-A 16.1 1 2 Proposed – Comparison portion for Alternative 1E-B 37.9 1 1 3 1 Alternative 1E-B 59.3 2 2 Proposed – Comparison portion for Alternative 1E-C 75.4 1 1 3 1 Alternative 1E-C 48.7 2 1W(a) Proposed – Total Length 76.5 1 1 1 4 2 Proposed – Comparison portion for Alternative 1W-A 20.3 1 2 2 Alternative 1W-A 16.2 1 2 1W(c) Proposed – Total Length 70.6 1 2 2 Proposed – Total Length 96.7 1 8 21 Proposed – Comparison portion for Alternative 2A 28.8 4 9 Alternative 2A 28.4 1 2 6 1 Proposed – Comparison portion for Alternative 2B 7.0 Alternative 2B 6.2 Proposed – Comparison portion for Alternative 2C 28.4 4 11 Alternative 2C 24.4 2 3 2 

3 Proposed – Total Length 56.5 1 

Proposed – Total Length 203.0 1 5 2 14 5 Proposed – Comparison portion for Alternatives 4A-4F 90.2 1 4 12 1 Alternative 4A 85.2 2 1 4 1 11 5 Alternative 4B 100.2 1 2 12 Alternative 4C 101.6 1 1 15 Alternative 4D 100.8 1 1 13 Alternative 4E 102.2 16 Alternative 4F 87.5 2 1 6 1 11 4 Proposed – Total Length 54.6 1 1 1 1

Proposed – Comparison portion for Alternatives 5A,B 25.3 1 1 1 1Alternative 5A 33.7 

Alternative 5B 44.4 1 Proposed – Comparison portion for Alternative 5C 33.2 1 1 1 1

Alternative 5C 26.1 Proposed – Comparison portion for Alternative 5D 19.4 

Alternative 5D 17.5 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

Proposed or Alternative Name

5

1E

2

Buffer Distance and Ac

1W

4

Segment 2-mile Buffer 

Number

Segment 

Length 

(Miles)

0.25-mile Buffer 0.6-mile Buffer 1-mile Buffer 

Table D.11-9 Page 1 of 2
Gateway West Transmission Line Draft 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/ Undete

Proposed – Total Length 118.1 2 2 3 3 3 Proposed – Comparison portion for Alternatives 7A,B 35.2 1 1 1 Alternative 7A 38.0 1 Alternative 7B 46.4 1 2 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 2 2 Alternative 7E 4.5 2 3 Proposed – Comparison portion for Alternative 7F 10.5 2 2 Alternative 7F 10.8 1 1 2 3 Proposed – Comparison portion for Alternative 7G 3.1 1 Alternative 7G 3.2 1 Proposed – Comparison portion for Alternatives 7H,I 118.1 2 2 3 3 3 Alternative 7H 127.5 2 4 3 11 1Alternative 7I 173.4 1 11 7 2Proposed – Comparison portion 7/9 for Alternative 7J2/ 143.8 2 2 3 3 4 Alternative 7J2/ 202.1 4 1 5 3 17 16 33 3

Proposed – Total Length 131.0 Proposed – Comparison portion for Alternative 8A 51.4 Alternative 8A 53.6 Proposed – Comparison portion for Alternative 8B 45.3 Alternative 8B 45.8 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 

Alternative 8E 18.5 Proposed – Total Length 161.7 1 1 1 2 Proposed – Comparison portion for Alternative 9A 7.8 Alternative 9A 7.7 Proposed – Comparison portion for Alternative 9B 49.5 1 Alternative 9B 53.2 Proposed – Comparison portion for Alternative 9C 14.7 1 Alternative 9C 15.3 Proposed – Comparison portion for Alternatives 9D-9H 57.2 1 1 1 Alternative 9D 58.4 Alternative 9E 68.7 2 2 5 7 Alternative 9F 62.9 Alternative 9G 56.4 Alternative 9H 61.0 

10 Proposed – Total Length 33.6 1 2 3 5 

1/ Refers to leks that have been defined as occupied in Wyoming and Idaho, and all leks in Nevada

0.6-mile Buffer 2-mile Buffer 

Proposed or Alternative Name

97

Segment 0.25-mile Buffer 1-mile Buffer 

Number

8

2/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for Segment 9. The table above com

Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 7 of the Proposed Route (118.1 miles) only.

Segment 

Length 

(Miles)

Buffer Distance and Ac

Table D.11-9 Page 2 of 2
Gateway West Transmission Line Draft EIS

Table D.11-10. Number of Columbian Sharp-Tailed Grouse Leks within Specified Distances from Route Centerlines

Occupied1/ Undetermined Occupied1/ 

Proposed – Total Length 100.6Proposed – Comparison portion for Alternative 1E-A 17.6Alternative 1E-A 16.1Proposed – Comparison portion for Alternative 1E-B 37.9Alternative 1E-B 59.3Proposed – Comparison portion for Alternative 1E-C 75.4Alternative 1E-C 48.71W(a) Proposed – Total Length 76.5Proposed – Comparison portion for Alternative 1W-A 20.3Alternative 1W-A 16.21W(c) Proposed – Total Length 70.6Proposed – Total Length 96.7Proposed – Comparison portion for Alternative 2A 28.8Alternative 2A 28.4Proposed – Comparison portion for Alternative 2B 7.0Alternative 2B 6.2Proposed – Comparison portion for Alternative 2C 28.4Alternative 2C 24.4

3 Proposed – Total Length 56.5

Proposed – Total Length 203.0 1 Proposed – Comparison portion for Alternatives 4A-4F 90.2Alternative 4A 85.2Alternative 4B 100.2Alternative 4C 101.6Alternative 4D 100.8Alternative 4E 102.2Alternative 4F 87.5Proposed – Total Length 54.6 1 Proposed – Comparison portion for Alternatives 5A,B 25.3 Alternative 5A 33.7 

Alternative 5B 44.4 

Proposed – Comparison portion for Alternative 5C 33.2 1 Alternative 5C 26.1 

Proposed – Comparison portion for Alternative 5D 19.4 1 Alternative 5D 17.5 

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 Nevada

Buffer Distance a

24

Segment 

Number Proposed or Alternative Name Segment Length (Miles)

5

1E

1W

0.25-mile Buffer 0.6-m

Table D.11-10 Page 1 of 2
Gateway West Transmission Line Draft 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 118.1 2 Proposed – Comparison portion for Alternatives 7A,B 35.2 1 Alternative 7A 38.0 

Alternative 7B 46.4 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 3.1Alternative 7G 3.2Proposed – Comparison portion for Alternatives 7H,I 118.1 2 Alternative 7H 127.5 1 Alternative 7I 173.4 1 Proposed – Comparison portion 7/9 for Alternative 7J 2/ 143.9 2 

Alternative 7J2/ 202.1 1 2 

Proposed – Total Length 131.0Proposed – Comparison portion for Alternative 8A 51.4Alternative 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 18.5Proposed – Total Length 161.7Proposed – Comparison portion for Alternative 9A 7.8Alternative 9A 7.7Proposed – Comparison portion for Alternative 9B 49.5Alternative 9B 53.2Proposed – Comparison portion for Alternative 9C 14.7Alternative 9C 15.3Proposed – Comparison portion for Alternatives 9D-9H 57.2Alternative 9D 58.4Alternative 9E 68.7Alternative 9F 62.9Alternative 9G 56.4Alternative 9H 61.0

10 Proposed – Total Length 33.6

1/ Refers to leks that have been defined as occupied in Wyoming and Idaho, and all leks in Nevada

0.25-mile Buffer

Buffer Distance a

Proposed or Alternative Name

Segment 

Number

2/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for S

with the corresponding portion of Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segm

987

0.6-m

Segment Length (Miles)

Table D.11-10 Page 2 of 2
Gateway West Transmission Line Draft 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

Proposed – Total Length 100.6 37.2Proposed – Comparison portion for Alternative 1E-A 17.6 8.9Alternative 1E-A 16.1 0.5Proposed – Comparison portion for Alternative 1E-B 37.9 15.4Alternative 1E-B 59.3Proposed – Comparison portion for Alternative 1E-C 75.4 20.8Alternative 1E-C 48.7 17.81W(a) Proposed – Total Length 76.5 34.0Proposed – Comparison portion for Alternative 1W-A 20.3 8.5Alternative 1W-A 16.2 0.71W(c) Proposed – Total Length 70.6 24.8Proposed – Total Length 96.7 44.5Proposed – Comparison portion for Alternative 2A 28.8 14.9Alternative 2A 28.4 16.8Proposed – Comparison portion for Alternative 2B 7.0Alternative 2B 6.2Proposed – Comparison portion for Alternative 2C 28.4 27.7Alternative 2C 24.4 24.1

3 Proposed – Total Length 56.5

Proposed – Total Length 203.0 43.8 14.2Proposed – Comparison portion for Alternatives 4A-4F 90.2 31.9 2.6Alternative 4A 85.2 28.4 2.6Alternative 4B 100.2 44.0 4.9 0.3Alternative 4C 101.6 56.4 4.9 0.3Alternative 4D 100.8 44.6 4.9 0.3Alternative 4E 102.2 57.0 4.9 0.3Alternative 4F 87.5 27.0 2.6Proposed – Total Length 54.6Proposed – Comparison portion for Alternatives 5A,B 25.3Alternative 5A 33.7 2.9Alternative 5B 44.4 9.1 0.8Proposed – Comparison portion for Alternative 5C 33.2Alternative 5C 26.1Proposed – Comparison portion for Alternative 5D 19.4Alternative 5D 17.5Proposed – Comparison portion for Alternative 5E 5.8Alternative 5E 5.3

6 Proposed – Total Length 0.5 0.3

Note: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactly

5

1E

1W

24

Table D.11-11 Page 1 of 2
Gateway West Transmission Line Draft 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 118.1 11.9 16.5 Proposed – Comparison portion for Alternatives 7A,B 35.2Alternative 7A 38.0 4.6Alternative 7B 46.4 7.9 1.1Proposed – Comparison portion for Alternative 7C 20.1 0.2 11.0Alternative 7C 20.3 11.0Proposed – 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 0.6Alternative 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 3.1 3.1Alternative 7G 3.2 3.2Proposed – Comparison portion for Alternatives 7H,I 118.1 11.9 16.5 Alternative 7H 127.5 41.1 26.7 Alternative 7I 173.4 67.8 41.5 1.8 Proposed – Comparison portion 7/9 for Alternative 7J1/ 143.8 16.8 17.7 

Alternative 7J1/ 202.1 73.0 49.3 1.8 Proposed – Total Length 131.0 13.2 21.2 11Proposed – Comparison portion for Alternative 8A 51.4 6.0 20.4 8.7Alternative 8A 53.6 15.6 5.7Proposed – 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 18.5Proposed – Total Length 161.7 11.5 10.0Proposed – Comparison portion for Alternative 9A 7.8 0.2Alternative 9A 7.7 2.2Proposed – Comparison portion for Alternative 9B 49.5 6.6 8.7Alternative 9B 53.2Proposed – Comparison portion for Alternative 9C 14.7 5.3 8.6Alternative 9C 15.3 0.9Proposed – Comparison portion for Alternatives 9D-9H 57.2Alternative 9D 58.4Alternative 9E 68.7 18.2 6.9 15Alternative 9F 62.9Alternative 9G 56.4Alternative 9H 61.0

10 Proposed – Total Length 33.6 0.1 6.1 5.9

Note: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactly

1/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for Segment 9. The 

miles) with the corresponding portion of Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 7 of 

987

Table D.11-11 Page 2 of 2
Gateway West Transmission Line Draft EIS

Table D.11-12. Acres of Two Single-Circuit Construction Impacts to ESA Wildlife Species with Available Quantitative Data, due to Constru

Black-Footed Ferret Canada Lynx 

Columbia Spotted 

Frog Greater Sage

Proposed – Total Length 96.7 311 1786 Proposed – Comparison portion for Alternative 2A 28.8 442 Alternative 2A 28.4 494 Proposed – Comparison portion for Alternative 2B 7.0 125 Alternative 2B 6.2 83 Proposed – Comparison portion for Alternative 2C 28.4 442 Alternative 2C 24.4 410 

3 Proposed –Total Length 56.5 286 858 

Proposed –Total Length 203.0 713 368 11 2675 Proposed – Comparison portion for Alternatives 4A-4F 90.2 529 368 11 1249 Alternative 4A 85.2 425 56 1348 Alternative 4B 100.2 574 38 1636 Alternative 4C 101.6 574 30 1563 Alternative 4D 100.8 574 33 1625 Alternative 4E 102.2 573 30 1547 Alternative 4F 87.5 417 150 38 1324 

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

Segment Length 

(Miles)

Acres of Habitat 

1/ Only segments crossing habitats for federally-listed species are listed in this table

42

Segment Number1/ Proposed or Alternative Name

Table D.11-12 Page 1 of 1
Gateway West Transmission Line Draft EIS

Table D.11-13. Acres of Two Single-Circuit Construction Impacts to BLM and Forest Service Sensitive Species with Available Quantitative Data, due 

Northern 

Goshawk

Proposed – Total Length 96.7 1 1445 Proposed – Comparison portion for Alternative 2A 28.8 1 317 Alternative 2A 28.4 41 438 Proposed – Comparison portion for Alternative 2B 7.0 1 96 Alternative 2B 6.2 44 64 Proposed – Comparison portion for Alternative 2C 28.4 295 Alternative 2C 24.4 343 

3 Proposed –Total Length 56.5 732 

Proposed –Total Length 203.0 21 2062 1122 43 Proposed – Comparison portion for Alternatives 4A-4F 90.2 904 118 Alternative 4A 85.2 895 120 Alternative 4B 100.2 1328 170 Alternative 4C 101.6 1411 157 Alternative 4D 100.8 1288 170 Alternative 4E 102.2 1354 154 Alternative 4F 87.5 906 121 

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

1/ Only segments crossing habitats for BLM Special Status and Forest Service Sensitive Species are listed in this table.2/ 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

4

Bald Eagle

Complex2/ Colony

Within a 1-

mile Winter 

Roost Buffer

Within a 1-

mile Nest 

Buffer

Black-Tailed Prairie Dog

Segment 

Number1/

Acres of Habitat Impacted by Construction 

2

Pr

Me

Ju

M

Columbian 

Sharp-Tailed 

Proposed or Alternative Name Grouse

Segment 

Length 

(Miles)

Burrowing 

Owl

Within a 1-

mile Nest 

Buffer

Table D.11-13 Page 1 of 1
Gateway West Transmission Line Draft 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

Proposed – Total Length 100.6 391Proposed – Comparison portion for Alternative 1E-A 17.6 103Alternative 1E-A 16.1 9Proposed – Comparison portion for Alternative 1E-B 37.9 144Alternative 1E-B 59.3 24Proposed – Comparison portion for Alternative 1E-C 75.4 238Alternative 1E-C 48.7 1081W(a) Proposed – Total Length 76.5 268Proposed – Comparison portion for Alternative 1W-A 20.3 94Alternative 1W-A 16.2 101W(c) Proposed – Total Length 70.6 267Proposed – Total Length 96.7 580Proposed – Comparison portion for Alternative 2A 28.8 189Alternative 2A 28.4 246Proposed – Comparison portion for Alternative 2B 7.0Alternative 2B 6.2Proposed – Comparison portion for Alternative 2C 28.4 362Alternative 2C 24.4 310

3 Proposed – Total Length 56.5

Proposed – Total Length 203.0 569 196Proposed – Comparison portion for Alternatives 4A-4F 90.2 417 38Alternative 4A 85.2 407 39Alternative 4B 100.2 603 80 5Alternative 4C 101.6 754 80 5Alternative 4D 100.8 639 81 5Alternative 4E 102.2 778 77 5Alternative 4F 87.5 395 41Proposed – Total Length 54.6Proposed – Comparison portion for Alternatives 5A,B 25.3Alternative 5A 33.7 34 t1/

Alternative 5B 44.4 127 16Proposed – Comparison portion for Alternative 5C 33.2Alternative 5C 26.1Proposed – Comparison portion for Alternative 5D 19.4Alternative 5D 17.5Proposed – Comparison portion for Alternative 5E 5.8Alternative 5E 5.3

6 Proposed – Total Length 0.5 15

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

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

1E

1W

245

Table D.11-14 Page 1 of 2
Gateway West Transmission Line Draft 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 118.1 176 257 Proposed – Comparison portion for Alternatives 7A,B 35.2Alternative 7A 38.0 54Alternative 7B 46.4 98 20Proposed – Comparison portion for Alternative 7C 20.1 2 161Alternative 7C 20.3 t1/ 160

Proposed – Comparison portion for Alternative 7D 6.2 19 63 Alternative 7D 6.8 24 55 Proposed – Comparison portion for Alternative 7E 3.8 44 Alternative 7E 4.5 54 Proposed – Comparison portion for Alternative 7F 10.5 82 Alternative 7F 10.8 52 Proposed – Comparison portion for Alternative 7G 3.1 46Alternative 7G 3.2 69Proposed – Comparison portion for Alternatives 7H,I 118.1 176 257 Alternative 7H 127.5 637 444 Alternative 7I 173.4 1057 636 Proposed – Comparison portion 7/9 for Alternative 7J 2/ 143.8 260 265 

Alternative 7J2/ 202.1 1164 725 

Proposed – Total Length 131.0 175 339 Proposed – Comparison portion for Alternative 8A 51.4 61 321 Alternative 8A 53.6 210 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 18.5Proposed – Total Length 161.7 178 148 Proposed – Comparison portion for Alternative 9A 7.8 9Alternative 9A 7.7 32Proposed – Comparison portion for Alternative 9B 49.5 94 139 Alternative 9B 53.2Proposed – Comparison portion for Alternative 9C 14.7 81 134Alternative 9C 15.3 29Proposed – Comparison portion for Alternatives 9D-9H 57.2Alternative 9D 58.4Alternative 9E 68.7 295 85 Alternative 9F 62.9Alternative 9G 56.4Alternative 9H 61.0

10 Proposed – Total Length 33.6 13 81 

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

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

2/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for Seg

compares 7J (202 miles) with the corresponding portion of Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternativethe Proposed Route (118.1 miles) only.

987

Table D.11-14 Page 2 of 2
Gateway West Transmission Line Draft EIS

Segment Number Proposed or Alternative Name Segment Length (miles) Formation Name 

Chugwater Formation or group Goose egg Formation Sundance Formation Cody shale Frontier Formation Fox Hills sandstone sandstone Cloverly and Morrison Formations Lance Formation Mowry and Thermopolis shales Mesaverde group Niobrara Formation Steele shale Casper Formation Wells and Amsden Formations Madison limestone, Darby Formation, Bighorn dolomite, Gallitin Limestone, GrosVentre Formation and Flathead sandAlluvium and colluvium Dune sand and loess Gravel, pediment, and fan deposits Upper Miocene Rocks Wagon Bed Formation Wind River Formation - at base locally includes equivalent of Indian Meadows Formation White River Formation White River Formation, upper conglomerate member Archean Granitic Rocks Granite Gneiss 

Paleontolo

Cody shale Fox Hills sandstone Lance Formation Mesaverde group Alluvium and colluvium Dune sand and loess 

Paleontolo

Cody shale Fox Hills sandstone Lance Formation Mesaverde group Alluvium and colluvium Dune sand and loess 

Paleontolo

Chugwater Formation or group Goose egg Formation Sundance Formation Frontier Formation Cloverly and Morrison Formations Mowry and Thermopolis shales Niobrara Formation Steele shale Wells and Amsden Formations Alluvium and colluvium Gravel, pediment, and fan deposits 

Wagon Bed Formation Wind River Formation - at base locally includes equivalent of Indian Meadows Formation Archean Granitic Rocks 

Paleontolo

1E Proposed – Comparison portion for Alternative 1E-A 17.6

1E Proposed – Comparison portion for Alternative 1E-B

37.9

Table D.13-1. Paleontological Sensitivity Rankings for Proposed and Alternative Routes

100.5

Alternative 1E-A 16.1

1E1E

Proposed –Total Length

Table D.13-1 Page 1 of 23
Gateway West Transmission Line Draft EIS

Segment Number Proposed or Alternative Name Segment Length (miles) Formation Name 

Table D.13-1. Paleontological Sensitivity Rankings for Proposed and Alternative Routes

Chugwater Formation or group Goose egg Formation Sundance Formation Frontier Formation and Mowry and Thermopolis shales Cloverly, Morrison, and Sundance Formations Mowry and Thermopolis shales Niobrara Formation Steele shale Wells and Amsden Formations Alluvium and colluvium Wagon Bed Formation Wind River Formation - at base locally includes equivalent of Indian Meadows Formation White River Formation Archean Granitic Rocks Granite Gneiss 

Paleontolo

Chugwater Formation or group 

Goose egg Formation Sundance Formation Frontier Formation Cloverly and Morrison Formations Mowry and Thermopolis shales Niobrara Formation Steele shale Wells and Amsden Formations Alluvium and colluvium Gravel, pediment, and fan deposits Upper Miocene Rocks Wagon Bed Formation Wind River Formation - at base locally includes equivalent of Indian Meadows Formation White River Formation White River Formation, upper conglomerate member Archean Granitic Rocks Granite Gneiss 

Paleontolo

Chugwater Formation or group 

Goose egg Formation Frontier Formation Cloverly, Morrison, and Sundance Formations Mowry and Thermopolis shales Niobrara Formation Steele shale Ten Sleep sandstone and Amsden Formation Madison limestone, Darby Formation, Bighorn dolomite, Gallatin Limestone, GrosVentre Formation and Flathead sanAlluvium and colluvium Upper Miocene Rocks Wind River Formation - at base locally includes equivalent of Indian Meadows Formation White River Formation White River Formation, upper conglomerate member Archean Granitic Rocks Granite Gneiss 

Paleontolo

1E 59.3

75.3

Alternative 1E-C

1E1E 48.7

Proposed – Comparison portion for Alternative 1E-C

Alternative 1E-B

Table D.13-1 Page 2 of 23
Gateway West Transmission Line Draft EIS

Segment Number Proposed or Alternative Name Segment Length (miles) Formation Name 

Table D.13-1. Paleontological Sensitivity Rankings for Proposed and Alternative Routes

Chugwater Formation or group Goose egg Formation Cody shale Frontier Formation Fox Hills sandstone sandstone Cloverly, Morrison, and Sundance Formations Lance Formation Mowry and Thermopolis shales Mesaverde group Niobrara Formation Steele shale Casper Formation Tensleep sandstone and Amsden Formation Madison limestone, Darby Formation, Bighorn dolomite, Gallatin Limestone, GrosVentre Formation and Flathead sanAlluvium and colluvium Dune sand and loess Upper Miocene Rocks Wind River Formation - at base locally includes equivalent of Indian Meadows Formation White River Formation, upper conglomerate member Archean Granitic Rocks Granite Gneiss 

Paleontolo

Cody shale 

Fox Hills sandstone Lance Formation Mesaverde group Alluvium and colluvium Dune sand and loess 

Paleontolo

Cody shale 

Fox Hills sandstone Lance Formation Mesaverde group Alluvium and colluvium Dune sand and loess 

Paleontolo

Chugwater Formation or group 

Goose egg Formation Cody shale Frontier Formation Fox Hills sandstone Cloverly, Morrison, and Sundance Formations Lance Formation Mowry and Thermopolis shales Mesaverde group Niobrara Formation Steele shale Casper Formation Madison limestone, Darby Formation, Bighorn dolomite, Gallatin Limestone, GrosVentre Formation and Flathead sanAlluvium and colluvium Upper Miocene Rocks Wind River Formation - at base locally includes equivalent of Indian Meadows Formation 

White River Formation, upper conglomerate member Whiter River Formation Archean Granitic Rocks Granite Gneiss 

Paleontolo

70.6

1W Proposed – Comparison portion for Alternative 1W-A1W 1W(a) Proposed – Total Length

20.3

1W 1W(c) Proposed – Total Length1W Alternative 1W-A 16.2

76.5

Table D.13-1 Page 3 of 23
Gateway West Transmission Line Draft EIS

Segment Number Proposed or Alternative Name Segment Length (miles) Formation Name 

Table D.13-1. Paleontological Sensitivity Rankings for Proposed and Alternative Routes

Lance Formation Lewis shale Medicine Bow Formation Mesaverde group Niobrara Formation Steele shale Steele shale and Niobrara Formation Alluvium and colluvium Playa lake and other lacustrine deposits Gravel, pediment, and fan deposits Fort Union Formation Hanna Formation Ferris Formation Miocene Rocks Wasatch Formation 

Paleontolo

Lewis shale Medicine Bow Formation Mesaverde group Steele shale Steele shale and Niobrara Formation Alluvium and colluvium Hanna Formation Ferris Formation Miocene Rocks 

Paleontolo

Lewis shale 

Medicine Bow Formation Mesaverde group Steele shale Steele shale and Niobrara Formation Alluvium and colluvium Gravel, pediment, and fan deposits Hanna Formation Ferris Formation Miocene Rocks 

Paleontolo

Mesaverde group 

Steele shale Steele shale and Niobrara Formation Alluvium and colluvium 

Paleontolo

Steele shale 

Steele shale and Niobrara Formation Alluvium and colluvium Gravel, pediment, and fan deposits 

Paleontolo

Almond Formation 

Fox Hills sandstone and Lewis shale Lance Formation Alluvium and colluvium Playa lake and other lacustrine deposits Dune sand and loess 

Fort Union Formation Green River Formation Wasatch Formation 

Paleontolo

Alternative 2A 28.4

2 Alternative 2B 6.23 Proposed – Total Length 56.5

2 Proposed – Comparison portion for Alternative 2B 7.02 Proposed – Total Length 96.72

2 Proposed – Comparison portion for Alternative 2A 28.8

Table D.13-1 Page 4 of 23
Gateway West Transmission Line Draft EIS

Segment Number Proposed or Alternative Name Segment Length (miles) Formation Name 

Table D.13-1. Paleontological Sensitivity Rankings for Proposed and Alternative Routes

Ankareh Formation, Thaynes limestone, Woodside shale, and Dinwoody Formation Nugget sandstone Stump Formation, Preuss sandstone or redbeds, and Twin Creek limestone Aspen shale Almond Formation Baxter shale Blair Formation Bear River Formation Ericson sandstone Frontier Formation Fox Hills sandstone and Lewis shale Gannett group Hilliard shale Rock Springs Formation Sage Junction, Quely, Cokeville, Thomas Fork, and Smiths Formations Sage Junction, Quely, Cokeville, Thomas Fork, and Smiths Formations Wells and Amsden Formations Phosphoria Formation and related rocks Alluvium and colluvium Landslide deposits Dune sand and loess Gravel, pediment, and fan deposits Terrace gravel (Pleistocene and/or Pliocene) Bridger Formation Fowkes Formation (Pliocene? and Eocene) Fort Union Formation Green River Formation Evanston Formation Salt Lake Formation Wasatch Formation Alluvium, Eolian Loess Alluvial-fan deposits Bonneville and Alpine FormationsAlluviumMain Canyon Formation of BrightTufa and TravertineSalt Lake FormationAlluviumFormation of Marsh ValleySalt Lake Formation Salt Lake Formation, Upper Conglomerate UnitSalt Lake Formation, Skyline Member Salt Lake Formation, Cache Valley MemberColluvium (Pleistocene)Eolian Loess Salt Lake FormationNugget SandstoneThaynes Limestone Twin Creek LimestoneAlluviumNugget Sandstone Swan Peak QuartziteGarden City LimestoneSt. Charles LimestoneNounan LimestoneSt. Charles LimestoneWorm Creek Quartzite MemberBrigham Quartzite DiamictonBrigham Quartzite

Paleontolo

4 Proposed – Total Length 203.0

Table D.13-1 Page 5 of 23
Gateway West Transmission Line Draft EIS

Segment Number Proposed or Alternative Name Segment Length (miles) Formation Name 

Table D.13-1. Paleontological Sensitivity Rankings for Proposed and Alternative Routes

Ankareh Formation, Thaynes limestone, Woodside shale, and Dinwoody Formation Nugget sandstone Stump Formation, Preuss sandstone or redbeds, and Twin Creek limestone Aspen shale Bear River Formation Frontier Formation Gannett group Hilliard shale Sage Junction, Quely, Cokeville, Thomas Fork, and Smiths Formations Sage Junction, Quely, Cokeville, Thomas Fork, and Smiths Formations Wells and Amsden Formations Phosphoria Formation and related rocks Alluvium and colluvium Landslide deposits Dune sand and loess Gravel, pediment, and fan deposits Terrace gravel (Pleistocene and/or Pliocene) Bridger Formation Fowkes Formation (Pliocene? and Eocene) Green River Formation Evanston Formation Salt Lake Formation Wasatch Formation Alluvium Salt Lake Formation Twin Creek Limestone 

Paleontolo

Ankareh Formation, Thaynes limestone, Woodside shale, and Dinwoody Formation 

Water Nugget sandstone Stump Formation, Preuss sandstone or redbeds, and Twin Creek limestone Aspen shale Bear River Formation Frontier Formation Gannett group Hilliard shale Sage Junction, Quely, Cokeville, Thomas Fork, and Smiths Formations Wells and Amsden Formations Phosphoria Formation and related rocks Alluvium and colluvium Landslide deposits Dune sand and loess Gravel, pediment, and fan deposits Terrace gravel (Pleistocene and/or Pliocene) Bridger Formation Fowkes Formation (Pliocene? and Eocene) Green River Formation Evanston Formation Salt Lake Formation Wasatch Formation Alluvium 

Salt Lake Formation Twin Creek Limestone 

Paleontolo

4 Alternative 4A 85.24 Proposed – Comparison portion for Alternatives 4A-4F

90.2

Table D.13-1 Page 6 of 23
Gateway West Transmission Line Draft EIS

Segment Number Proposed or Alternative Name Segment Length (miles) Formation Name 

Table D.13-1. Paleontological Sensitivity Rankings for Proposed and Alternative Routes

Ankareh Formation, Thaynes limestone, Woodside shale, and Dinwoody Formation Nugget sandstone Stump Formation, Preuss sandstone or redbeds, and Twin Creek limestone Aspen shale Adaville Formation Frontier Formation Gannett group Hilliard shale Alluvium and colluvium Gravel, pediment, and fan deposits Bridger Formation Fowkes Formation (Pliocene? and Eocene) Green River Formation: Laney member Evanston Formation Salt Lake Formation Wasatch Formation Alluvium Salt Lake Formation Twin Creek Limestone 

Paleontolo

Ankareh Formation, Thaynes limestone, Woodside shale, and Dinwoody Formation 

Nugget sandstone Stump Formation, Preuss sandstone or redbeds, and Twin Creek limestone Aspen shale Adaville Formation Frontier Formation Gannett group Hilliard shale Sage Junction, Quely, Cokeville, Thomas Fork, and Smiths Formations Alluvium and colluvium Gravel, pediment, and fan deposits Bridger Formation Fowkes Formation (Pliocene? and Eocene) Green River Formation Evanston Formation Salt Lake Formation Wasatch Formation Alluvium Salt Lake Formation Twin Creek Limestone 

Paleontolo

Nugget sandstone 

Stump Formation, Preuss sandstone or redbeds, and Twin Creek limestone Aspen shale Adaville Formation Frontier Formation Gannett group Hilliard shale Alluvium and colluvium Gravel, pediment, and fan deposits Bridger Formation Fowkes Formation (Pliocene? and Eocene) 

Green River Formation: Laney Member Evanston Formation Salt Lake Formation Wasatch Formation Alluvium Salt Lake Formation Twin Creek Limestone 

Paleontolo

44 Alternative 4B

Alternative 4C 101.6

100.8

Alternative 4D

4

100.2

Table D.13-1 Page 7 of 23
Gateway West Transmission Line Draft EIS

Segment Number Proposed or Alternative Name Segment Length (miles) Formation Name 

Table D.13-1. Paleontological Sensitivity Rankings for Proposed and Alternative Routes

Nugget sandstone Stump Formation, Preuss sandstone or redbeds, and Twin Creek limestone Aspen shale Adaville Formation Frontier Formation Gannett group Hilliard shale Sage Junction, Quely, Cokeville, Thomas Fork, and Smiths Formations Alluvium and colluvium Gravel, pediment, and fan deposits Bridger Formation Fowkes Formation (Pliocene? and Eocene) Green River Formation Evanston Formation Salt Lake Formation Wasatch Formation Alluvium Salt Lake Formation Twin Creek Limestone 

Paleontolo

Ankareh Formation, Thaynes limestone, Woodside shale, and Dinwoody Formation 

Nugget sandstone Stump Formation, Preuss sandstone or redbeds, and Twin Creek limestone Aspen shale Bear River Formation Frontier Formation Gannett group Hilliard shale Sage Junction, Quely, Cokeville, Thomas Fork, and Smiths Formations Wells and Amsden Formations Phosphoria Formation and related rocks Alluvium and colluvium Landslide deposits Dune sand and loess Gravel, pediment, and fan deposits Terrace gravel (Pleistocene and/or Pliocene) Bridger Formation Fowkes Formation (Pliocene? and Eocene) Green River Formation Evanston Formation Salt Lake Formation Wasatch Formation Alluvium Salt Lake Formation Twin Creek Limestone 

Paleontolo

4 Alternative 4F

4 Alternative 4E

87.5

102.2

Table D.13-1 Page 8 of 23
Gateway West Transmission Line Draft EIS

Segment Number Proposed or Alternative Name Segment Length (miles) Formation Name 

Table D.13-1. Paleontological Sensitivity Rankings for Proposed and Alternative Routes

Great Blue Limestone, lower limestone member Floodplain sedimentsFormation of Marsh ValleyLoessAlluvial-fan depositsEolian LoessAlluvial depositsLoessAlluvial fan gravelAlluvial fan gravel Dune sandAlluvial fan gravelBonneville flood gravelFormation of Marsh ValleyStarlight and Salt Lake Formations, undifferentiated Sunbeam FormationAlluviumLoessStarlight and Salt Lake Formations, upper memberStarlight and Salt Lake Formations, undifferentiatedStarlight and Salt Lake Formations, upper memberOquirrh Formation, Unit D Oquirrh Formation, Unit BOquirrh Formation, Unit A, lower limestoneSt. Charles Formation, upper memberGarden City FormationGarden City FormationSwan Peak QuartziteFish Haven DolomiteSt. Charles Formation, upper memberAlluvium (Holocene and Pleistocene) American Falls Lake Beds (upper Pleistocene) Raft Formation (upper or middle Pleistocene) Dune sand and loess Sun Beam Formation (Upper Pleistocene) Terrace gravel (Pleistocene) Massacre Volcanics (Pliocene and upper Miocene) Walcott Tuff (upper Miocene) Water 

Paleontolo

Alluvial deposits 

Alluvial-fan depositsEolian LoessAlluvial depositsLoessAlluvial fan gravelStarlight and Salt Lake Formations, undifferentiated LoessStarlight and Salt Lake Formations, upper memberStarlight and Salt Lake Formations, undifferentiatedStarlight and Salt Lake Formations, upper memberOquirrh Formation, Unit D Oquirrh Formation, Unit BOquirrh Formation, Unit A, lower limestoneSt. Charles Formation, upper memberGarden City FormationSwan Peak QuartziteFish Haven DolomiteSt. Charles Formation, upper member

Paleontolo

25.3

55

Proposed – Comparison portion for Alternatives 5A,B

Proposed – Total Length 54.6 

Table D.13-1 Page 9 of 23
Gateway West Transmission Line Draft EIS

Segment Number Proposed or Alternative Name Segment Length (miles) Formation Name 

Table D.13-1. Paleontological Sensitivity Rankings for Proposed and Alternative Routes

Alluvium Alluvial-fan depositsSalt Lake Formation, undifferentiatedAlluvial-fan depositsEolian LoessSalt Lake Formation, undifferentiated Oquirrh Group Unit C Oquirrh Group Unit BManning Canyon shaleOquirrh Group Units B and C, undifferentiatedEolian LoessGreat Blue LimestoneLaketown DolomiteWater Canyon FormationColluvium and talusWater Canyon FormationGarden City FormationFish Haven DolomiteLaketown Dolomite

Paleontolo

Eolian LoessAlluviumColluvium and talus Alluvial-fan depositsEolian LoessSalt Lake Formation, undifferentiated Oquirrh Group Unit COquirrh Group Unit DOquirrh Group Unit BManning Canyon shaleOquirrh Group Units B and C, undifferentiatedOquirrh Group Unit AColluvium and talusWater Canyon FormationGarden City FormationFish Haven DolomiteLaketown Dolomite

Paleontolo

Alluvial deposits Alluvial-fan depositsEolian LoessAlluvial depositsLoessAlluvial fan gravelTravertine hot springs deposits Great Blue Limestone, lower limestone member Sunbeam FormationAlluviumLoessStarlight and Salt Lake Formations, upper memberStarlight and Salt Lake Formations, undifferentiatedStarlight and Salt Lake Formations, upper memberOquirrh Formation, Unit D Oquirrh Formation, Unit BOquirrh Formation, Unit A, lower limestoneSt. Charles Formation, upper member Garden City FormationSwan Peak QuartziteFish Haven DolomiteSt. Charles Formation, upper member

Paleontolo

5

33.7

55

Alternative 5B 44.4Alternative 5A

Proposed – Comparison portion for Alternative 5C 33.2

Table D.13-1 Page 10 of 23
Gateway West Transmission Line Draft EIS

Segment Number Proposed or Alternative Name Segment Length (miles) Formation Name 

Table D.13-1. Paleontological Sensitivity Rankings for Proposed and Alternative Routes

Loess Starlight and Salt Lake Formations, upper memberGarden City FormationSwan Peak QuartziteStarlight and Salt Lake Formations, undifferentiated LoessGreat Blue Limestone, lower limestone memberSunbeam FormationStarlight and Salt Lake Formations, upper member Starlight Formation, middle member, Arbon Valley Tuff memberGarden City FormationSwan Peak QuartziteStarlight Formation, lower memberGreat Blue Limestone, lower limestone member Garden City FormationFish Haven DolomiteLaketown DolomiteLoessSwan Peak QuartziteGarden City Formation

Paleontolo

Great Blue Limestone, lower limestone member Oquirrh Formation Alluvial-fan depositsEolian LoessAlluvial depositsLoessAlluvial fan gravelColluvium and talus Dune sand, alluvial fan gravel Loess Starlight and Salt Lake Formations, undifferentiated Sunbeam Formation Salt Lake Formation, undifferentiatedSalt Lake Formation, upperAlluvium (Holocene and Pleistocene) American Falls Lake Beds (upper Pleistocene) Raft Formation (upper or middle Pleistocene) Dune sand and loess Sunbeam Formation (upper Pleistocene) Terrace gravel (Pleistocene) Massacre Volcanics (Pliocene and upper Miocene) Walcott Tuff (upper Miocene) Water 

Paleontolo

Oquirrh Group, Manning Canyon Shale Starlight and Salt Lake Formations, upper member Starlight and Salt Lake Formations, undifferentiated Alluvial deposits Dune sand, alluvial fan gravel Dune sand and loess Terrace gravel (Pleistocene) American Falls Lake Beds (upper Pleistocene) Loess 

Paleontolo

19.417.5

Proposed – Comparison portion for Alternative 5D

555 Alternative 5C 

Alternative 5D

26.1

Table D.13-1 Page 11 of 23
Gateway West Transmission Line Draft EIS

Segment Number Proposed or Alternative Name Segment Length (miles) Formation Name 

Table D.13-1. Paleontological Sensitivity Rankings for Proposed and Alternative Routes

Alluvium (Holocene and Pleistocene) American Falls Lake Beds (upper Pleistocene) Raft Formation (upper or middle Pleistocene) Dune sand and loess Sunbeam Formation (upper Pleistocene) Terrace gravel (Pleistocene) Massacre Volcanics (Pliocene and upper Miocene) Walcott Tuff (upper Miocene) Dune sand, alluvial fan gravel Water 

Paleontolo

Alluvium (Holocene and Pleistocene) American Falls Lake Beds (upper Pleistocene) Raft Formation (upper or middle Pleistocene) Dune sand and loess Sunbeam Formation (upper Pleistocene) Terrace gravel (Pleistocene) Neeley Formation (middle Pliocene to upper Miocene) Loess Dune sand, alluvial fan gravel Water 

Paleontolo

Dune sand and loess 

Basalt of Notch ButteMixed alluvial and lacustrine depositsBasalt of Bacon Butte

Paleontolo

Floodplain sedimentsFormation of Marsh ValleyLoessAlluvial-fan depositsEolian LoessAlluvial depositsLoessAlluvial fan gravelAlluvial fan gravel No detail Bonneville flood gravelFormation of Marsh ValleyStarlight and Salt Lake Formations, undifferentiated Sunbeam FormationAlluviumLoessStarlight and Salt Lake Formations, upper memberNo detail - possilby rhyolite Salt Lake Formation, undifferentiated Oquirrh Formation, Unit D Oquirrh Formation, Unit BOquirrh Formation, Unit A, lower limestoneSt. Charles Formation, upper member No detail - Mississippian sedimentary units No detail - Devonian sedimentary units Garden City FormationFish Haven DolomiteSt. Charles Formation, upper member

Paleontolo

5.35.8

76 Proposed – Total Length55

118.1

Alternative 5E

Proposed – Comparison portion for Alternative 5E

Proposed – Total Length

0.5

Table D.13-1 Page 12 of 23
Gateway West Transmission Line Draft EIS

Segment Number Proposed or Alternative Name Segment Length (miles) Formation Name 

Table D.13-1. Paleontological Sensitivity Rankings for Proposed and Alternative Routes

Alluvium Alluvial-fan depositsSalt Lake Formation, undifferentiatedStarlight and Salt Lake Formations, undifferentiated Colluvium and talus Sunbeam FormationAlluviumStarlight and Salt Lake Formations, upper member Salt Lake Formation, undifferentiated Oquirrh Formation, Unit D Oquirrh Formation, Unit BOquirrh Formation, Unit A, lower limestoneSt. Charles Formation, upper memberGarden City FormationNo detail - Garden City Formation, Fish Haven dolomite 

Paleontolo

Alluvium Alluvial-fan depositsSalt Lake Formation, undifferentiatedSalt Lake Formation, upper tuff and basalt unit Eolian Loess Alluvial-fan depositsEolian LoessSalt Lake Formation, undifferentiated Oquirrh Group Unit C Oquirrh Group Unit BManning Canyon ShaleOquirrh Group Units B and C, undifferentiatedEolian LoessGreat Blue LimestoneLaketown DolomiteWater Canyon Formation

Paleontolo

Eolian LoessAlluvial depositsAlluvial-fan depositsSalt Lake Formation, undifferentiatedColluvium and talus Colluvium and talus Eolian Loess Alluvial-fan depositsEolian LoessSalt Lake Formation, undifferentiated Oquirrh Group Unit COquirrh Group Unit DOquirrh Group Units B and C, undifferentiatedOquirrh Group Unit A

Paleontolo

No detail - Alluvium No detail - Alluvial deposits, possibly Salt Lake and/or Starlight Formations No detail - basalt No detail - possibly Marsh Valley Fm or Bonneville flood gravel No detail - possibly Salt Lake Formation, tuffs and basalts 

Paleontolo

No detail - Alluvium No detail - Alluvial deposits, possibly Salt Lake and/or Starlight Formations No detail - basalt No detail - Oquirrh Group 

Paleontolo

77

38.035.220.1

77

Alternative 7A

Proposed – Comparison portion for Alternative 7C

7

46.420.3

Proposed – Comparison portion for Alternatives 7A,B

Alternative 7B

Alternative 7C

Table D.13-1 Page 13 of 23
Gateway West Transmission Line Draft EIS

Segment Number Proposed or Alternative Name Segment Length (miles) Formation Name 

Table D.13-1. Paleontological Sensitivity Rankings for Proposed and Alternative Routes

No detail - gravels, colluvium and talus No detail - basalt No detail - possibly Marsh Valley Fm or Bonneville flood gravel 

Paleontolo

No detail - Gravel deposits No detail - basalt No detail - possibly Marsh Valley Fm or Bonneville flood gravel 

Paleontolo

No detail - gravels, colluvium and talus 

Paleontolo

No detail - Gravel deposits No detail - Oquirrh Group 

Paleontolo

No detail - gravels, colluvium and talus No detail - Oquirrh Group No detail - possibly Great Blue Limestone No detail - possibly Garden City Formation and/or Fish Haven Dolomote 

Paleontolo

No detail - possibly Garden City Formation and/or Fish Haven Dolomote No detail - possibly Great Blue Limestone No detail - Garden City Formation, Fish Haven dolomite No detail - Oquirrh Group No detail - Gravel deposits 

Paleontolo

No detail - Alluvial deposits, possibly Salt Lake and/or Starlight Formations No detail - possibly rhyolite 

Paleontolo

No detail - Alluvial deposits, possibly Salt Lake and/or Starlight Formations No detail - possibly rhyolite 

Paleontolo

No detail - Devonian sedimentary units Great Blue Limestone, lower limestone member No detail - Garden City Formation, Fish Haven dolomite No detail - Oquirrh Group No detail - Oquirrh Group No detail - Oquirrh Group St. Charles Formation, upper member Alluvial-fan deposits Colluvium and talus Snake Plain lava flow No detail - possibly Marsh Valley Fm or Bonneville flood gravel Starlight and Salt Lake Formations, undifferentiated Alluvium, possibly Sunbeam Formation Starlight and Salt Lake Formations Salt Lake Formation, undifferentiated Salt Lake Formation, undifferentiated 

Paleontolo

No detail - Garden City Formation, Fish Haven dolomite 

No detail - Garden City Formation, Fish Haven dolomite, St. Charles Limestone Oquirrh Group 

No detail - possibly Oquirrh Group 

Oquirrh Group Alluvium 

Alluvial-fan deposits Colluvium and talus Pleistocene glacial till and debris 

No detail - possibly Marsh Valley Fm or Bonneville flood gravel 

Starlight and Salt Lake Formations, undifferentiated 

Alluvium, possibly Sunbeam Formation 

Starlight and Salt Lake Formations 

Salt Lake Formation, undifferentiated 

Salt Lake Formation, undifferentiated 

Paleontolo

777

6.8

777

777

10.5

Alternative 7E

Proposed – Comparison portion for Alternative 7D 

Proposed – Comparison portion for Alternative 7E

7 Alternative 7D

Proposed – Comparison portion for Alternatives 7H,I

Alternative 7H

118.1

3.2

Alternative 7G

Proposed – Comparison portion for Alternative 7G

Alternative 7F 10.8

Proposed – Comparison portion for Alternative 7F

127.5

6.23.83.14.5

Table D.13-1 Page 14 of 23
Gateway West Transmission Line Draft EIS

Segment Number Proposed or Alternative Name Segment Length (miles) Formation Name 

Table D.13-1. Paleontological Sensitivity Rankings for Proposed and Alternative Routes

Undivided Devonian and Silurian rocks No detail - Garden City Formation, Fish Haven dolomite, St. Charles Limestone Oquirrh Group No detail - possibly Oquirrh Group Oquirrh Group Alluvium Alluvial-fan deposits Colluvium and talus Pleistocene glacial till and debris No detail - possibly Marsh Valley Fm or Bonneville flood gravel Starlight and Salt Lake Formations, undifferentiated Alluvium, possibly Sunbeam Formation Eocene intrusives, plutons and/or dikes Miocene stream and lake deposits Starlight and Salt Lake Formations Salt Lake Formation, undifferentiated Salt Lake Formation, undifferentiated 

Paleontolo

Fan alluvium (upper Pleistocene) Colluvium derived from hard rocks (Holocene to Lower Pleistocene) Loess Unit No. 3 - overlies basalt Deposits of playas Basalt of Hub Butte Tuff of McMullen Creek Alluvium Alluvial fan deposits Upper member of tuff of Wooden Shoe Butte Devonian sedimentary units Mississippian sedimentary units Garden City FormationFish Haven DolomiteSt. Charles Formation, upper memberOquirrh Formation, unit B Oquirrh Formation, unit D St. Charles Formation, upper member Floodplain sedimentsFormation of Marsh ValleyLoessAlluvial fan depositsEolian LoessAlluvial depositsLoessAlluvial fan gravelAlluvial fan gravel No detail Formation of Marsh Valley Starlight and Salt Lake Formations, undifferentiated Alluvium LoessStarlight and Salt Lake Formations, upper memberRhyolite? Salt Lake Formation, undifferentiated 

Paleontolo

77 Alternative 7I 173.4

Proposed – Comparison portion 7/9 for Alternative 7J 143.9 1/

Table D.13-1 Page 15 of 23
Gateway West Transmission Line Draft EIS

Segment Number Proposed or Alternative Name Segment Length (miles) Formation Name 

Table D.13-1. Paleontological Sensitivity Rankings for Proposed and Alternative Routes

Loess Unit No. 3 - overlies basalt Undivided Devonian and Silurian rocks No detail - Garden City Formation, Fish Haven dolomite, St. Charles Limestone Oquirrh Group No detail - possibly Oquirrh Group Oquirrh Group Alluvium Alluvial fan deposits Colluvium and talus Pleistocene glacial till and debris No detail - possibly Marsh Valley Fm or Bonneville flood gravel Starlight and Salt Lake Formations, undifferentiated Alluvium, possibly Sunbeam Formation Eocene intrusives, plutons and/or dikes Miocene stream and lake deposits Pliocene olivine basalt flows and associated tuff and detritus of southern Idaho Starlight and Salt Lake City Formations Salt Lake Formation, undifferentiated Salt Lake Formation, undifferentiated 

Paleontolo

Alluvium 

No-Detail gravel deposits 

Alluvium 

Cold Springs Creek lava flow 

Bonneville Flood Deposits 

Pebble gravel in conspicuous iron-stained beds as much as 25 feet thick in lake deposits 

Black Mesa Gravel 

Basalt of Higby Cave 

Basalt of Sand Creek 

Sedimentary material dominated by massive lake beds of white-weathering fine silt, clay, and diatom 

Dune Sand 

Upper Basalt of Halverson Lake 

Basalt of Initial Point 

Pleistocene waterlaid detritus; may be distal deposits of glacial floods and outwash 

Middle Pleistocene plateau and canyon-filling basalt in and near the Snake Plain 

Middle Pleistocene plateau and canyon-filling basalt in and near the Snake Plain Pleistocene outwash, fanglomerate, flood and terrace gravels 

Upper Pleistocene Snake Plain lava flows 

Upper Pleistocene Snake Plain lava flows 

Recent relatively un weathered Snake Plain Basalt flows and cinder cones 

Basalt of Swan Falls Road Hill 

Undifferentiated basalt flows on the periphyry of the Birds of Prey area whose sources are unknown 

Lower Pleistocene to Pliocene basalts with associated tuffs and volcanic detritus Glenns Ferry Formation of the Idaho Group, includes some younger lacustrine and fluvial sediments Gravel and associated clastic materials from southern sources, includes materials transported from the Owyhee Mou

Basalt of Orchard Ranch 

Basalt of the Tombstone Patch Rapids 

Idaho Group and other fluvial, lacustrine, and eolian sediments in the northeast part of the Murphy Quadrangle 

Basalt flows associated with the Chalk Hills and Poison Creek Formations 

Poison Creek and Chalk Hill Formations, undivided 

Water 

Basaltic tuff of Waldvogel Canal 

Basaltic tuff of McDermott Road 

Middle basalt of Halverson Lake 

Chalky volcanic field 

Paleontolo

8 Proposed – Total Length 131.0

Alternative 7J 202.1 1/ 7

Table D.13-1 Page 16 of 23
Gateway West Transmission Line Draft EIS

Segment Number Proposed or Alternative Name Segment Length (miles) Formation Name 

Table D.13-1. Paleontological Sensitivity Rankings for Proposed and Alternative Routes

Alluvium, Alluvium of mainstreams Incomplete details - Gravel deposits Middle Pleistocene plateau and canyon-filling basalt in and near the Snake Plain Middle Pleistocene plateau and canyon-filling basalt in and near the Snake Plain Pleistocene outwash, fanglomerate, flood and terrace gravels Upper Pleistocene Snake Plain lava flows Upper Pleistocene Snake Plain lava flows Recent relatively un weathered Snake Plain Basalt flows and cinder cones Lower Pleistocene to Pliocene basalts with associated tuffs and volcanic detritus Idaho Group and other fluvial, lacustrine, and eolian sediments in the northeast part of the Murphy Quadrangle 

Paleontolo

Open Water Alluvial-fan deposits Incomplete details - Gravel deposits Pleistocene outwash, fanglomerate, flood and terrace gravels Tuana Gravel Middle Pleistocene plateau and canyon-filling basalt in and near the Snake Plain Middle Pleistocene plateau and canyon-filling basalt in and near the Snake Plain Middle Pleistocene deposits Pleistocene outwash, fanglomerate, flood and terrace gravels Basalt of Bacon Butte Basalt of Notch Butte No details Basalt of Shoestring Road Idaho Group and other fluvial, lacustrine, and eolian sediments in the northeast part of the Murphy Quadrangle 

Paleontolo

Open Water Alluvium Pleistocene waterlaid detritus; may be distal deposits of glacial floods and outwash Idaho Group and other fluvial, lacustrine, and eolian sediments in the northeast part of the Murphy Quadrangle Basalt of Higby Cave Basalt of Sand Creek Bonneville Flood Deposits Dune Sand Basalt of Swan Falls Road Hill Upper Basalt of Halverson Lake Basalt of Initial Point Glenns Ferry Formation of the Idaho Group, includes some younger lacustrine and fluvial sediments Gravel and associated clastic materials from southern sources, includes materials transported from the Owyhee MouBasalt of Orchard Ranch Basalt of Tombstone Patch Rapids Basalt flows associated with the Chalk Hills and Poison Creek Formations Poison Creek and Chalk Hill Formations, undivided Basaltic tuff of Waldvogel Canal Basaltic tuff of McDermott Road Middle basalt of Halverson Lake Chalky volcanic field Undifferentiated basalt flows on the periphyry of the Birds of Prey area whose sources are unknown Alluvium 

Paleontolo

Open Water Alluvial fan deposits 

Basalt of Gooding Butte Basalt of Initial Point Middle Pleistocene plateau and canyon-filling basalt in and near the Snake Plain Middle Pleistocene plateau and canyon-filling basalt in and near the Snake Plain Recent relatively un weathered Snake Plain Basalt flows and cinder cones Pliocene stream and lake deposits; may be due to volcanic and block faulting events 

Paleontolo

88

51.445.3

8 Alternative 8B8

Proposed – Comparison portion for Alternative 8BProposed – Comparison portion for Alternative 8A

Alternative 8A

45.853.6

Table D.13-1 Page 17 of 23
Gateway West Transmission Line Draft EIS

Segment Number Proposed or Alternative Name Segment Length (miles) Formation Name 

Table D.13-1. Paleontological Sensitivity Rankings for Proposed and Alternative Routes

Alluvium Pleistocene waterlaid detritus; may be distal deposits of glacial floods and outwash 

Paleontolo

Alluvium Basalt of Initial Point 

Paleontolo

Basalt of Sand Creek Basalt of Initial Point Basalt of Higby Cave Alluvium Undifferentiated basalt flows on the periphyry of the Birds of Prey area whose sources are unknown 

Paleontolo

Basalt of Sand Creek Basalt of Initial Point Basalt of Higby Cave Idaho Group and other fluvial, lacustrine, and eolian sediments in the northeast part of the Murphy Quadrangle Alluvium 

Paleontolo

Open Water Middle basalt of Halverson Lake Upper Basalt of Halverson Lake Basalt of Swan Falls Road Hill Basaltic tuff of McDermott Road Basalt of the Tombstone Patch Rapids Basaltic tuff of Waldvogel Canal Bonneville Flood Deposits Dune sand Basalt of Initial Point Glenns Ferry Formation of the Idaho Group, includes some younger lacustrine and fluvial sediments Basalt flows associated with the Chalk Hills and Poison Creek Formations 

Paleontolo

Open Water 

Lower basalt of Promontory Point Upper basalt of Promontory Point Oregon Trail volcanic field Basalt of Sinker Butte Basalt of Swan Falls Road Hill Basalt of Murphy Rim Basalt of Trio Hill Basaltic tuff of Swan Falls Dam Basaltic tuff of Moore Road Landslide deposits Glenns Ferry Formation of the Idaho Group, includes some younger lacustrine and fluvial sediments Glenns Ferry Formation of the Idaho Group, includes some younger lacustrine and fluvial sediments 

Paleontolo

888

8.16.5

Proposed – Comparison portion for Alternative 8D 

Proposed – Comparison portion for Alternative 8C

8 Alternative 8C

Alternative 8D

Alternative 8E

6.4

18.5

6.97.0

88 Proposed – Comparison portion for Alternative 8E

Table D.13-1 Page 18 of 23
Gateway West Transmission Line Draft EIS

Segment Number Proposed or Alternative Name Segment Length (miles) Formation Name 

Table D.13-1. Paleontological Sensitivity Rankings for Proposed and Alternative Routes

Fan alluvium 2 (upper Pleistocene) Colluvium derived from hard rocks (Holocene to Lower Pleistocene) Loess Unit 2: thin loess overlying basalt (Upper and Middle Pleistocene) Loess Unit 3, Moderately thick loess overlying basalt (upper to lower? Pleistocene) Deposits of Playas (Holocene and Upper Pleistocene) Alluvium Alluvium Alluvium of sidestreams (Holocene)  Deadman Canyon Lava flow Black Mesa Gravel Sedimentary material dominated by massive lake beds of white-weathering fine silt, clay, and diatom Basalt of Hub Butte (Pleistocene) Pleistocene outwash, fanglomerate, flood and terrace gravels Lower Pleistocene outwash, fanglomerate, flood and terrace gravels Middle Pleistocene plateau and canyon-filling basalt in and near the Snake Plain Middle Pleistocene plateau and canyon-filling basalt in and near the Snake Plain Tuana Gravel Glenns Ferry Formation Idaho Group and other fluvial, lacustrine, and eolian sediments in the northeast part of the Murphy Quadrangle Rhyolite of castleford Crossing (Miocene) Basalt of Devil Creek Butte or Tuana Butte (Pliocene or Miocene) Pliocene silicic welded tuff, ash and flow rock; most common in southwestern Idaho Tuff of McMullen Creek Basalt of the Murphy Area Pliocene olivine basalt flows and associated tuff and detritus of southern Idaho Poison Creek and Chalk Hill Formations, undivided Rhyolite lava flows of Reynolds Creek Teapot volcanic field Upper Member of Tuff of Wooden Shoe Butte Alluvial fan deposits (Holocene and Pleistocene) Landslide deposits (Holocene to Middle Pleistocene) Pebble gravel in conspicuous iron-stained beds as much as 25 feet thick in lake deposits Talus Gravel surface, abundant Eocene volcanics (Quaternary or Tertiary) Gravel surface, abundant quartzite (Quaternary and Tertiary) Gravel lens or surface, abundant quartzite (Tertiary) Clay to sand sized sediments (Miocene or Pliocene) Chalky volcanic field Basalt of Sinker Creek Glenns Ferry Formation of the Idaho Group, includes some younger lacustrine and fluvial sediments Idaho Group and other fluvial, lacustrine, and eolian sediments in the northeast part of the Murphy Quadrangle Chalk Hills Formation of the Idaho Group 

Paleontolo

Basalt of Hub Butte (Pleistocene) 

Alluvial fan deposits (Holocene and Pleistocene) Alluvium Fan alluvium 2 (upper Pleistocene) Loess Unit 3, Moderately thick loess overlying basalt (upper to lower? Pleistocene) 

Paleontolo

Basalt of Hub Butte (Pleistocene) Alluvial fan deposits (Holocene and Pleistocene) Alluvium (Holocene) 

Fan alluvium 2 (upper Pleistocene) Loess Unit 3, Moderately thick loess overlying basalt (upper to lower? Pleistocene) Tuff of McMullen Creek 

Paleontolo

9 Proposed – Comparison portion for Alternative 9A 7.899 7.7

Proposed – Total Length

Alternative 9A

162.2

Table D.13-1 Page 19 of 23
Gateway West Transmission Line Draft EIS

Segment Number Proposed or Alternative Name Segment Length (miles) Formation Name 

Table D.13-1. Paleontological Sensitivity Rankings for Proposed and Alternative Routes

Pleistocene outwash, fanglomerate, flood and terrace gravels Lower Pleistocene outwash, fanglomerate, flood and terrace gravels Pleistocene outwash, fanglomerate, flood and terrace gravels Idaho Group and other fluvial, lacustrine, and eolian sediments in the northeast part of the Murphy Quadrangle Pliocene olivine basalt flows and associated tuff and detritus of southern Idaho Pliocene silicic welded tuff, ash and flow rock; most common in southwestern Idaho Loess Unit 3, Moderately thick loess overlying basalt (upper to lower? Pleistocene) Colluvium derived from hard rocks (Holocene to Lower Pleistocene) Loess Unit 2: thin loess overlying basalt (Upper and Middle Pleistocene) Landslide deposits (Holocene to Middle Pleistocene) Rhyolite of castleford Crossing (Miocene) Alluvium of sidestreams (Holocene) Basalt of Devil Creek Butte or Tuana Butte (Pliocene or Miocene) Deadman Canyon lava flow Pebble gravel in conspicuous iron-stained beds as much as 25 feet thick in lake deposits Black Mesa Gravel Sedimentary material dominated by massive lake beds of white-weathering fine silt, clay, and diatom Talus Tuana Gravel Glenns Ferry Formation 

Paleontolo

Middle Pleistocene plateau and canyon-filling basalt in and near the Snake Plain Loess Unit 3, Moderately thick loess overlying basalt (upper to lower? Pleistocene) Colluvium derived from hard rocks (Holocene to Lower Pleistocene) Rhyolite of Balanced Rock (Miocene) Basalt of Devil Creek Butte or Tuana Butte (Pliocene or Miocene) Rhyolite of castleford Crossing (Miocene) Yahoo Clay (Pleistocene) Basalt of Elmas Hill (Pliocene or Miocene) Glenns Ferry Formation (Pliocene) Rhyolite of Salmon Falls Creek, undivided (Miocene) Tuana Gravel Alluvium Black Mesa Gravel Sedimentary material dominated by massive lake beds of white-weathering fine silt, clay, and diatom Glenns Ferry Formation Tuana Gravel Older Alluvium Pebble gravel in conspicuous iron-stained beds as much as 25 feet thick in lake deposits 

Paleontolo

(Pliocene or Miocene) Basalt of Devel Creek Butte or Tuana Butte (Pliocene or Miocene) Alluvium of side streams (Holocened and Pleistocene) Pliocene silicic welded tuff, ash and flow rock; most common in southwestern Idaho Loess Unit 3, Moderately thick loess overlying basalt (upper to lower? Pleistocene) Colluvium derived from hard rocks (Holocene to Lower Pleistocene) Loess Unit 2: thin loess overlying basalt (Upper and Middle Pleistocene) Landslide deposits (Holocene to Middle Pleistocene) 

Paleontolo

Alluvium Pleistocene outwash, fanglomerate, flood and terrace gravels Rhyolite of castleford Crossing (Miocene) 

Basalt of Devil Creek Butte or Tuana Butte (Pliocene or Miocene) Pliocene silicic welded tuff, ash and flow rock; most common in southwestern Idaho Glenns Ferry Formation (Pliocene) Tuana Gravel Rhyolite of Balanced Rock (Miocene) Loess Unit 3, Moderately thick loess overlying basalt (upper to lower? Pleistocene) Colluvium derived from hard rocks (Holocene to Lower Pleistocene) Alluvium of side streams 

Paleontolo

9

53.215.3

Proposed – Comparison portion for Alternative 9B

9 Proposed – Comparison portion for Alternative 9C 14.7

Alternative 9B

Alternative 9C

49.5

99

Table D.13-1 Page 20 of 23
Gateway West Transmission Line Draft EIS

Segment Number Proposed or Alternative Name Segment Length (miles) Formation Name 

Table D.13-1. Paleontological Sensitivity Rankings for Proposed and Alternative Routes

Gravel surface, abundant Eocene volcanics (Quaternary or Tertiary) Alluvial fan deposits (Holocene and Pleistocene) Alluvium 

Glenns Ferry Formation 

Gravel surface, abundant quartzite (Quaternary and Tertiary) 

Clay to sand sized sediments (Miocene or Pliocene) 

Glenns Ferry Formation of the Idaho Group, includes some younger lacustrine and fluvial sediments 

Gravel and associated clastic materials from southern sources, includes materials transported from the Owyhee Mou

Basalt of the Murphy Area 

Poison Creek and Chalk Hill Formations, undivided 

Basalt of Sinker Creek 

Chalk Hills Formation of the Idaho Group 

Gravel lens or surface, abundant quartzite (Tertiary) 

Paleontolo

Open Water 

Gravel lens or surface, abundant quartzite (Tertiary) 

Clay to sand sized sediments (Miocene or Pliocene) Dune sand 

Gravel surface, abundant quartzite (Quaternary and Tertiary) 

Basalt of Goldsmith Road (Pliocene) Bonneville Flood Deposits 

Alluvial Deposits 

Basalt of Strike Dam Road (Pleistocene) 

Basalt of Dixie Road (Pliocene) Basalt of Canyon Creek (Pliocene) Glenns Ferry Formation of the Idaho Group, includes some younger lacustrine and fluvial sediments 

Basalt of Dorsey Butte 

Chattin Flat volcanic complex 

Basalt of Big Foot Butte 

Undifferentiated basalt flows on the periphyry of the Birds of Prey area whose sources are unknown 

Basalt of Old Powerline Road 

Upper basalt of Promontory Point 

Basaltic tuff of Moore Road 

Basaltic tuff of Swan Falls Dam 

Basalt of Sinker Butte 

Oregon Trail volcanic field 

Basalt of Murphy Rim 

Poison Creek and Chalk Hill Formations, undivided 

Basalt of Katie Lane 

Lower basalt of Promontory Point 

Basalt that flowed north and south from the south-central part of the Central Ridge Vent Complex 

Landslide deposits 

Gravel surface, lithology undivided (Quaternary or Tertiary) 

Basalt of the Murphy Area 

Paleontolo

Gravel lens or surface, abundant quartzite (Tertiary) 

Gravel surface, abundant quartzite (Quaternary and Tertiary) Glenns Ferry Formation 

Dune Sand 

Allivium 

Clay to sand sized sediments (Miocene or Pliocene) 

Middle Pleistocene deposits 

Pliocene olivine basalt flows and associated tuff and detritus of southern Idaho 

Chalk Hills Formation of the Idaho Group 

Gravel and associated clastic materials from southern sources, includes materials transported from the Owyhee Mou

Poison Creek and Chalk Hill Formations, undivided 

Basalt of the Murphy Area 

Alluvial Fan Deposits 

Basalt of Hot Creek (Pliocene) 

Gravel surface, abundant quartzite (Quaternary and Tertiary) 

Reefal limestone of Hot Spring (Miocene to Pliocene) Rhyolite, undifferentiated 

Basalt of Black Rocks (Pliocene) 

Rhyolite of Horse Basin (Miocene) Idaho Group and other fluvial, lacustrine, and eolian sediments in the northeast part of the Murphy Quadrangle 

Pliocene stream and lake deposits; may be due to volcanic and block faulting events 

Pliocene silicic welded tuff, ash and flow rock; most common in southwestern Idaho Rhyolite of Browns Creek area 

Granite of Silver City batholith, Owyhee Mountains 

Silver City Rhyolite, undifferentiated 

Glenns Ferry Formation of the Idaho Group, includes some younger lacustrine and fluvial sediments 

Basalt flows associated with the Chalk Hills and Poison Creek Formations 

Basalt flows that are subaerial, undivided 

Paleontolo

99

9 Proposed – Comparison portion for Alternatives 9D,E,F,G,H 57.4

Alternative 9E

Alternative 9D 58.4

68.9

Table D.13-1 Page 21 of 23
Gateway West Transmission Line Draft EIS

Segment Number Proposed or Alternative Name Segment Length (miles) Formation Name 

Table D.13-1. Paleontological Sensitivity Rankings for Proposed and Alternative Routes

Open Water Basalt of Strike Dam Road (Pleistocene) Basalt of Canyon Creek (Pliocene) Basalt of Dixie Road (Pliocene) Alluvial fan deposits (Holocene and Pleistocene) Alluvial Deposits Bonneville Flood Deposits Gravel suface, lithology undivided (Quaternary or Tertiary) Gravel surface, abundant quartzite (Quaternary and Tertiary) Gravel lens or surface, abundant quartzite (Tertiary) Clay to sand sized sediments (Miocene or Pliocene) Glenns Ferry Formation Open Water Basalt that flowed north and south from the south-central part of the Central Ridge Vent Complex Basalt of Old Powerline Road Lower basalt of Promontory Point Upper basalt of Promontory Point Undifferentiated basalt flows on the periphyry of the Birds of Prey area whose sources are unknown Oregon Trail volcanic field Basalt of Sinker Butte Basalt of Big Foot Butte Basalt of Dorsey Butte Basalt of Murphy Rim Basaltic tuff of Swan Falls Dam Basaltic tuff of Moore Road Basalt of Canyon Creek (Pliocene) Chattin Flat volcanic complex Basalt of the Murphy Area Alluvial Deposits Glenns Ferry Formation of the Idaho Group, includes some younger lacustrine and fluvial sediments Poison Creek and Chalk Hill Formations, undivided 

Paleontolo

Open Water Basalt of Strike Dam Road (Pleistocene) Basalt of Canyon Creek (Pliocene) Basalt of Dixie Road (Pliocene) Basalt of Goldsmith Road (Pliocene) Basalt of Katie Lane Alluvial Deposits Bonneville Flood Deposits Dune sand Landslide deposits (Holocene to Middle Pleistocene) Gravel surface, lithology undivided (Quaternary or Tertiary) Gravel surface, abundant quartzite (Quaternary and Tertiary) Gravel lens or surface, abundant quartzite (Tertiary) Clay to sand sized sediments (Miocene or Pliocene) Open Water Basalt that flowed north and south from the south-central part of the Central Ridge Vent Complex Basalt of Old Powerline Road Lower basalt of Promontory Point Upper basalt of Promontory Point Undifferentiated basalt flows on the periphyry of the Birds of Prey area whose sources are unknown Montini volcanic complex Oregon Trail volcanic field Basalt of Sinker Butte Basalt of Big Foot Butte Conservancy Flats volcanic complex Basalt of Dorsey Butte Basalt of Murphy Rim Lower basalt of Nahas Ranch Upper basalt of Nahas Ranch Basalt of Otter Masszcre Site Basaltic tuff of Red Trails Basalt of Canyon Creek (Pliocene) Chattin Flat volcanic complex Basalt of the Murphy Area Alluvium Bonneville Flood Deposits Glenns Ferry Formation of the Idaho Group, includes some younger lacustrine and fluvial sediments Poison Creek and Chalk Hill Formations, undivided 

Paleontolo

9 63.2

9 Alternative 9G 56.4

Alternative 9F

Table D.13-1 Page 22 of 23
Gateway West Transmission Line Draft EIS

Segment Number Proposed or Alternative Name Segment Length (miles) Formation Name 

Table D.13-1. Paleontological Sensitivity Rankings for Proposed and Alternative Routes

Open Water Basalt of Strike Dam Road (Pleistocene) Basalt of Canyon Creek (Pliocene) Basalt of Dixie Road (Pliocene) Alluvial fan deposits (Holocene and Pleistocene) Alluvial Deposits Bonneville Flood Deposits Gravel surface, lithology undivided (Quaternary or Tertiary) Gravel surface, abundant quartzite (Quaternary and Tertiary) Gravel lens or surface, abundant quartzite (Tertiary) Clay to sand sized sediments (Miocene or Pliocene) Gravel surface, lithology undivided (Quaternary or Tertiary) Open Water Basalt that flowed north and south from the south-central part of the Central Ridge Vent Complex Basalt of Old Powerline Road Lower basalt of Promontory Point Upper basalt of Promontory Point Undifferentiated basalt flows on the periphyry of the Birds of Prey area whose sources are unknown Montini volcanic complex Oregon Trail volcanic field Basalt of Sinker Butte Basalt of Big Foot Butte Conservancy Flats volcanic complex Basalt of Dorsey Butte Basalt of Murphy Rim Lower basalt of Nahas Ranch Upper basalt of Nahas Ranch Bassalt of Otter Massacre Site Basaltic tuff of Red Trails Basalt of Canyon Creek (Pliocene) Chattin Flat volcanic complex Basalt of the Murphy Area Alluvium Bonneville Flood Deposits Glenns Ferry Formation of the Idaho Group, includes some younger lacustrine and fluvial sediments Poison Creek and Chalk Hill Formations, undivided 

Paleontolo

Open Water 

Alluvium of side streams Alluvial-fan deposits Basalt of Skelaton Butte Basalt of Rocky Butte Basalt of Wilson Butte Basalt of Notch ButteMixed alluvial and lacustrine depositsBasalt of Bacon ButteBasalt of Hansen ButteYounger Tertiary basalt flows, undivided

Paleontolo

Note: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactly

10 Proposed – Total Length

1/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for Segment 9. The table above compares 7J (202 mile

of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 7 of the Proposed Route (118.1 miles) only.

9 Alternative 9H 61.2

33.6

Table D.13-1 Page 23 of 23
Gateway West Transmission Line Draft EIS

Low Medium 

< 70 70 to 84 

Proposed – Total Length 100.6 100.6Proposed – Compare to Alternative 1E-A 17.6 17.6Alternative 1E-A 16.1 16.1Proposed – Compare to Alternative 1E-B 37.9 37.9Alternative 1E-B 59.3 59.3Proposed – Compare to Alternative 1E-C 75.4 75.4Alternative 1E-C 48.7 48.71W(a) Proposed – Total Length 76.5 76.5Proposed – Comparison portion for Alternative 1W-A 20.3 20.3Alternative 1W-A 16.2 16.21W(c) Proposed – Total Length 70.6 70.6Proposed – Total Length 96.7 96.7Proposed – Compare to Alternative 2A 28.8 28.8Alternative 2A 28.4 28.4Proposed – Compare to Alternative 2B 7.0 7Alternative 2B 6.2 6.2Proposed – Compare to Alternative 2C 28.4Alternative 2C 24.4

3 Proposed – Total Length 56.4 56.4

Proposed – Total Length 203.0 97.9 15.9 Proposed – Compare to Alternatives 4A-4F 90.2 45.8 15.9 Alternative 4A 85.2 38 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 16.7 Proposed – Total Length 54.6 10 Proposed – Compare to Alternatives 5A,B 25.3 Alternative 5A 33.7 Alternative 5B 44.4 Proposed – Compare to Alternative 5C 33.2 4.3 Alternative 5C 26.1 2.9 Proposed – Compare to Alternative 5D 19.4 10 Alternative 5D 17.5 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

Note: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactly

54

Table D.14-1. OPS Earthquake Hazard for Proposed and Alternative Routes

1W

1E

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 Draft EIS

Low Medium 

< 70 70 to 84 

Proposed – Total Length 118.1 41.1 31.5 Proposed – Compare to Alternatives 7A,B 35.2 1.4 Alternative 7A 38.0 1.1 Alternative 7B 46.4 1.1 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 0.8Proposed – Compare to Alternative 7G 3.1 3.1Alternative 7G 3.2 3.2Proposed – Compare to Alternatives 7H,I 118.1 41.1 31.5 Alternative 7H 127.5 30.9 29.8 Alternative 7I 173.4 44.5 43.7 Proposed – Comparison portion 7/9 for Alternative 7J 1/ 143.9 67.0 31.5 

Alternative 7J1/ 202.1 73.2 43.7 Proposed – Total Length 131.0 131Proposed – Compare to Alternative 8A 51.4 51.4Alternative 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 18.5 18.5Proposed – Total Length 161.7 161.7Proposed – Compare to Alternative 9A 7.8 7.8Alternative 9A 7.7 7.7Proposed – Compare to Alternative 9B 49.5 49.5Alternative 9B 53.2 53.2Proposed – Compare to Alternative 9C 14.7 14.7Alternative 9C 15.3 15.3Proposed – Compare to Alternative 9D,E,F,G,H 57.2 57.2Alternative 9D 58.4 58.4Alternative 9E 68.7 68.7Alternative 9F 62.9 62.9Alternative 9G 56.4 56.4Alternative 9H 61.0 61.0

10 Seg 10 Proposed – Total Length 33.6 33.6

Note: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactly

1/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for S

compares 7J (202 miles) with the corresponding portion of Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternativSegment 7 of the Proposed Route (118.1 miles) only.

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

Table D.14-1 Page 2 of 2
Gateway West Transmission Line Draft EIS

Magnitude 0.1 to 6 Magnitude 6.0 to 6.9 

Proposed – Total Length 100.6 79.8Proposed – Comparison portion for Alternative 1E-A 17.6 17.6Alternative 1E-A 16.1 16.1Proposed – Comparison portion for Alternative 1E-B 37.9 22.5Alternative 1E-B 59.3 29Proposed – Comparison portion for Alternative 1E-C 75.4 54.6Alternative 1E-C 48.7 28.31W(a) Proposed – Total Length 76.5 54.7Proposed – Comparison portion for Alternative 1W-A 20.3 20.3Alternative 1W-A 16.2 16.21W(c) Proposed – Total Length 70.6 49.7Proposed – Total Length 96.7 90.4Proposed – Comparison portion for Alternative 2A 28.8 28.8Alternative 2A 28.4 28.4Proposed – Comparison portion for Alternative 2B 7 7Alternative 2B 6.2 6.2Proposed – Comparison portion for Alternative 2C 28.4 28.4Alternative 2C 24.4 24.4

3 Proposed – Total Length 56.4 40.5

Proposed – Total Length 203 176.8 105.7Proposed – Comparison portion for Alternatives 4A-4F 90.2 76.7 45Alternative 4A 85.2 66.4 49.9Alternative 4B 100.2 82.2 63.8Alternative 4C 101.6 79.5 65.2Alternative 4D 100.8 82.8 64.4Alternative 4E 102.2 80.1 65.8Alternative 4F 87.6 64.9 52.3Proposed – Total Length 54.6 7.3 47.9 Proposed – Comparison portion for Alternatives 5A,B 25.3 25.3Alternative 5A 33.7 33.7Alternative 5B 44.4 9.9 44.4Proposed – Comparison portion for Alternative 5C 33.2 32.2Alternative 5C 26.1 24.9Proposed – Comparison portion for Alternative 5D 19.4 12.7 Alternative 5D 17.5 13.5 Proposed – Comparison portion for Alternative 5E 5.8 Alternative 5E 5.3 

6 Proposed – Total Length 0.5 0.3 

Note: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactly

Segment Length 

(Miles)

Buffered Mileage

4

Table D.14-2. Affected Miles by Earthquake Magnitude Buffers

1W

Segment Number Proposed or Alternative Name

1E

52

Table D.14-2 Page 1 of 2
Gateway West Transmission Line Draft EIS

Magnitude 0.1 to 6 Magnitude 6.0 to 6.9 

Proposed – Total Length 118.1 6.8 58.8 Proposed – Comparison portion for Alternatives 7A,B 35.2 35.2Alternative 7A 38.0 38Alternative 7B 46.4 11.1 46.4Proposed – Comparison portion for Alternative 7C 20.1 7 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 3.1Alternative 7G 3.2Proposed – Comparison portion for Alternatives 7H,I 118.1 6.8 58.9 Alternative 7H 127.5 52.9 77.6Alternative 7I 173.4 70.5 97.5Proposed – Comparison portion 7/9 for Alternative 7J 1/ 79.4 15.6 58.9 

Alternative 7J1/ 168.0 70.5 97.5

Proposed – Total Length 131.0 Proposed – Comparison portion for Alternative 8A 51.4 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 18.5Proposed – Total Length 161.7Proposed – Comparison portion for Alternative 9A 7.8Alternative 9A 7.7Proposed – Comparison portion for Alternative 9B 49.5Alternative 9B 53.2 Proposed – Comparison portion for Alternative 9C 14.7Alternative 9C 15.3Proposed – Comparison portion for Alternatives 9D-9H 57.2Alternative 9D 58.4Alternative 9E 68.7Alternative 9F 62.9Alternative 9G 56.4Alternative 9H 61.0

10 Proposed – Total Length 33.6 13.9 

Note: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactly

1/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for S

compares 7J (202 miles) with the corresponding portion of Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternativ7 of the Proposed Route (118.1 miles) only.

Segment Length 

(Miles)

Buffered Mileage

Table D.14-2. Affected Miles by Earthquake Magnitude Buffers cont.

Segment Number Proposed or Alternative Name

978

Table D.14-2 Page 2 of 2
Gateway West Transmission Line Draft EIS

Low Risk <70 Medium Ri

Proposed – Total Length 100.6 100.6Proposed – Compare to Alternative 1E-A 17.6 17.6Alternative 1E-A 16.1 16.1Proposed – Compare to Alternative 1E-B 37.9 37.9Alternative 1E-B 59.3 59.3Proposed – Compare to Alternative 1E-C 75.4 75.4Alternative 1E-C 48.7 44.3 

1W(a) Proposed – Total Length 76.5 72.2 Proposed – Comparison portion for Alternative 1W-A 20.3 20.3Alternative 1W-A 16.2 16.21W(c) Proposed – Total Length 70.6 67 Proposed – Total Length 96.7 96.7Proposed – Compare to Alternative 2A 28.8 28.8Alternative 2A 28.4 28.4Proposed – Compare to Alternative 2B 7.0 7Alternative 2B 6.2 6.2Proposed – Compare to Alternative 2C 28.4 28.4Alternative 2C 24.4 24.4

3 Proposed – Total Length 56.4 35.2 21.2

Proposed – Total Length 203.0 154.3 15 Proposed – Compare to Alternatives 4A-4F 90.2 54.5 3.5 Alternative 4A 85.2 43.9 3 

Alternative 4B 100.2 50.1 5 

Alternative 4C 101.6 46.5 16.7 

Alternative 4D 100.8 50.1 5 

Alternative 4E 102.2 46.5 16.7 Alternative 4F 87.5 43.9 2.4 

Proposed – Total Length 54.6 54.6Proposed – Compare to Alternatives 5A,B 25.3 25.3Alternative 5A 33.7 33.7Alternative 5B 44.4 44.4Proposed – Compare to Alternative 5C 33.2 33.2Alternative 5C 26.1 26.1Proposed – Compare to Alternative 5D 19.4 19.4Alternative 5D 17.5 17.5Proposed – Compare to Alternative 5E 5.8 5.8Alternative 5E 5.3 5.3

6 Proposed – Total Length 0.5 0.5

Note: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactly

Table D.14-3. Miles of Landslide Hazard Ranking Crossed by Alternative 

1E

1W

52

Segment Number Proposed or Alternative Name

Segment Length 

(Miles)

Buffered Mi

4

Table D.14-3 Page 1 of 2
Gateway West Transmission Line Draft EIS

Low Risk <70 Medium Ri

Proposed – Total Length 118.1 118.1Proposed – Compare to Alternatives 7A,B 35.2 35.2Alternative 7A 38.0 38Alternative 7B 46.4 46.4Proposed – Compare to Alternative 7C 20.1 20.1Alternative 7C 20.3 20.3Proposed – Compare to Alternative 7D 6.2 6.2Alternative 7D 6.8 6.8Proposed – Compare to Alternative 7E 3.8 3.8Alternative 7E 4.5 4.5Proposed – Compare to Alternative 7F 10.5 10.5Alternative 7F 10.8 10.8Proposed – Compare to Alternative 7G 3.1 3.1Alternative 7G 3.2 3.2Proposed – Compare to Alternatives 7H,I 118.1 118.1Alternative 7H 127.5 127.5Alternative 7I 173.4 169.1 4.3Proposed – Comparison portion 7/9 for Alternative 7J 1/ 143.9 143.9

Alternative 7J1/ 202.1 197.8 4.3Proposed – Total Length 131.0 123.9 7.1Proposed – Compare to Alternative 8A 51.4 46.7 4.8Alternative 8A 53.6 53.6Proposed – Compare to Alternative 8B 45.3 42.9 2.4Alternative 8B 45.8 42.3 3.4Alternative 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 4.6 2.4Alternative 8E 18.5 18.5Proposed – Total Length 161.7 161.7Proposed – Compare to Alternative 9A 7.8 7.8Alternative 9A 7.7 7.7Proposed – Compare to Alternative 9B 49.5 49.5Alternative 9B 53.2 53.2Proposed – Compare to Alternative 9C 14.7 14.7Alternative 9C 15.3 15.3Proposed – Comparison portion for Alternatives 9D-9H 57.2 57.2Alternative 9D 58.4 58.4Alternative 9E 68.7 68.7Alternative 9F 62.9 62.9Alternative 9G 56.4 56.4Alternative 9H 61.0 61.0

10 Seg 10 Proposed – Total Length 33.6 33.6

Note: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactly

1/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for S

(202 miles) with the corresponding portion of Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compaRoute (118.1 miles) only.

Table D.14-3. Miles of Landslide Hazard Ranking Crossed by Alternative cont.

Segment Number Proposed or Alternative Name

Segment Length 

(Miles)

Buffered Mi

987

Table D.14-3 Page 2 of 2
Gateway West Transmission Line Draft EIS

Coal Oil and Gas 

Proposed – Total Length 100.6 1096 31 Proposed – Comparison portion for Alternative 1E-A 17.6 213 16 Alternative 1E-A 16.1 125 12 Proposed – Comparison portion for Alternative 1E-B 37.9 393 6 Alternative 1E-B 59.3 729 5 Proposed – Comparison portion for Alternative 1E-C 75.3 832 16 Alternative 1E-C 48.7 311 21 1W(a) Proposed – Total Length 76.5 623 60 Proposed – Comparison portion for Alternative 1W-A 20.3 210 28 Alternative 1W-A 16.2 136 6 1W(c) Proposed – Total Length 70.6 817 35 Proposed – Total Length 96.7 1544 11 373 Proposed – Comparison portion for Alternative 2A 28.8 398 83 Alternative 2A 28.4 446 92 Proposed – Comparison portion for Alternative 2B 7.0 104 54 Alternative 2B 6.2 80 34 Proposed – Comparison portion for Alternative 2C 28.4 369 11 46 Alternative 2C 28.8 322 8 61 

3 Proposed – Total Length 56.4 863 15 317 

Proposed – Total Length 203.0 2846 15 472 Proposed – Comparison portion for Alternatives 4A-4F 90.2 1234 300 Alternative 4A 85.2 1250 250 Alternative 4B 100.2 1484 11 473 Alternative 4C 101.6 1478 11 395 Alternative 4D 100.8 1505 11 520 Alternative 4E 102.2 1495 11 448 Alternative 4F 87.5 1260 229 Proposed-Total Length 54.6Proposed – Comparison portion for Alternatives 5A,B 25.3Alternative 5A 33.7Alternative 5B 44.4Proposed – Comparison portion for Alternative 5C 33.2Alternative 5C 26.1Proposed – Comparison portion for Alternative 5D 19.4Alternative 5D 17.5Proposed – Comparison portion for Alternative 5E 5.8Alternative 5E 5.3

6 Proposed-Total Length 0.5

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

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.

Table D.14-4. Acres of Construction Disturbance within Subsidence Areas

1E

2

5

4

Proposed Alternative or Route Name

1W

Segment Number Total Disturbance Acreage

Segment Length 

(Miles)

Table D.14-4 Page 1 of 2
Gateway West Transmission Line Draft EIS

Coal Oil and Gas 

Proposed-Total Length 118.1Proposed – Comparison portion for Alternatives 7A,B 35.2Alternative 7A 38.0Alternative 7B 46.4Proposed – 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 3.1Alternative 7G 3.2Proposed – Comparison portion for Alternatives 7H,I 118.1Alternative 7H 127.5Alternative 7I 173.4Proposed – Comparison portion 7/9 for Alternative 7J 2/ 143.9

Alternative 7J2/ 202.1

Proposed – Total Length 131.0Proposed – Comparison portion for Alternative 8A 51.4Alternative 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 18.5Proposed – Total Length 161.7Proposed – Comparison portion for Alternative 9A 7.8Alternative 9A 7.7Proposed – Comparison portion for Alternative 9B 49.5Alternative 9B 53.2Proposed – Comparison portion for Alternative 9C 14.7Alternative 9C 15.3Proposed – Comparison portion for Alternatives 9D-9H 57.2Alternative 9D 58.4Alternative 9E 68.7Alternative 9F 62.9Alternative 9G 56.4Alternative 9H 61.0

10 Proposed – Total Length 33.6

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

2/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for S

the corresponding portion of Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 

789

Table D.14-4. Acres of Construction Disturbance within Subsidence Areas cont.

Segment Number Proposed Alternative or Route Name Total Disturbance Acreage

Segment Length

(Miles)

Table D.14-4 Page 2 of 2
Gateway West Transmission Line Draft EIS

Coal Oil and Gas 

Proposed – Total Length 100.6 283 6 Proposed – Comparison portion for Alternative 1E-A 17.6 51 5 Alternative 1E-A 16.1 39 7 Proposed – Comparison portion for Alternative 1E-B 37.9 91 1 Alternative 1E-B 59.3 164 1 Proposed – Comparison portion for Alternative 1E-C 75.4 218 2 Alternative 1E-C 48.7 92 4 1W(a) Proposed – Total Length 76.5 182 20 Proposed – Comparison portion for Alternative 1W-A 20.3 47 6 Alternative 1W-A 16.2 40 2 1W(c) Proposed – Total Length 70.6 144 5 Proposed – Total Length 96.7 401 3 95 Proposed – Comparison portion for Alternative 2A 28.8 74 16 Alternative 2A 28.4 90 21 Proposed – Comparison portion for Alternative 2B 7.0 16 9 Alternative 2B 6.2 18 7 Proposed – Comparison portion for Alternative 2C 28.4 77 3 10 Alternative 2C 24.4 52 1 12 

3 Proposed – Total Length 56.4 191 4 77 

Proposed – Total Length 203.0 651 3 100 Proposed – Comparison portion for Alternatives 4A-4F 90.2 262 63 Alternative 4A 85.2 277 56 Alternative 4B 100.2 348 4 116 Alternative 4C 101.6 341 4 96 Alternative 4D 100.8 355 4 131 Alternative 4E 102.2 345 4 110 Alternative 4F 87.5 280 53 Proposed-Total Length 54.6Proposed – Comparison portion for Alternatives 5A,B 25.3Alternative 5A 33.7Alternative 5B 44.4Proposed – Comparison portion for Alternative 5C 33.2Alternative 5C 26.1Proposed – Comparison portion for Alternative 5D 19.4Alternative 5D 17.5Proposed – Comparison portion for Alternative 5E 5.8Alternative 5E 5.3

6 Proposed-Total Length 0.5

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

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.

Proposed Alternative or Route Name

Segment Length

(Miles) Total Disturbance Acreage

5

42

Table D.14-5. Acres of Operations Disturbance within Subsidence Areas

1E

1W

Segment Number

Table D.14-5 Page 1 of 2
Gateway West Transmission Line Draft EIS

Coal Oil and Gas 

Proposed-Total Length 118.1Proposed – Comparison portion for Alternatives 7A,B 35.2Alternative 7A 38.0Alternative 7B 46.4Proposed – 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 3.1Alternative 7G 3.2Proposed – Comparison portion for Alternatives 7H,I 118.1Alternative 7H 127.5Alternative 7I 173.4Proposed – Comparison portion 7/9 for Alternative 7J 2/ 143.9

Alternative 7J2/ 202.1Proposed – Total Length 131.0Proposed – Comparison portion for Alternative 8A 51.4Alternative 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 18.5Proposed – Total Length 161.7Proposed – Comparison portion for Alternative 9A 7.8Alternative 9A 7.7Proposed – Comparison portion for Alternative 9B 49.5Alternative 9B 53.2Proposed – Comparison portion for Alternative 9C 14.7Alternative 9C 15.3Proposed – Comparison portion for Alternatives 9D-9H 57.2Alternative 9D 58.4Alternative 9E 68.7Alternative 9F 62.9Alternative 9G 56.4Alternative 9H 61.0

10 Proposed – Total Length 33.6

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

Segment Length

(Miles)

2/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for S

the corresponding portion of Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 

Table D.14-5. Acres of Operations Disturbance within Subsidence Areas cont.

789

Segment Number Proposed Alternative or Route Name Total Disturbance Acreage

Table D.14-5 Page 2 of 2
Gateway West Transmission Line Draft EIS

1 to 4 4 to 8 8 to 12 T

Proposed – Total Length 100.6 14.7 11.2 15.4 Proposed – Comparison portion for Alternative 1E-A 17.6 0.4 Alternative 1E-A 16.1 3.2 Proposed – Comparison portion for Alternative 1E-B 37.9 1.5 10.6 Alternative 1E-B 59.3 5.3 29.8 Proposed – Comparison portion for Alternative 1E-C 75.3 13.0 11.2 11.5 

Alternative 1E-C 48.7 10.5 1W(a) Proposed – Total Length 76.5 0.8 14.6 Proposed – Comparison portion for Alternative 1W-A 20.3Alternative 1W-A 16.2 3.1 1W(c) Proposed – Total Length 70.6 7.1 13.7 Proposed – Total Length 96.7Proposed – Comparison portion for Alternative 2A 28.8Alternative 2A 28.4Proposed – Comparison portion for Alternative 2B 7.0Alternative 2B 6.2Proposed – Comparison portion for Alternative 2C 28.4Alternative 2C 24.4

3 Proposed – Total Length 56.4 37.6 3.1 

Proposed – Total Length 203.0 52.6 2.8 10.0 Proposed – Comparison portion for Alternatives 4A-4F 90.2 24.0 Alternative 4A 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 54.6 2.4 12.2 Proposed – Comparison portion for Alternatives 5A,B 25.3 2.4 9.8 Alternative 5A 33.7 5.4 10.5 Alternative 5B 44.4 2.6 14.9 Proposed – Comparison portion for Alternative 5C 33.2 2.4 10.3 Alternative 5C 26.1 2.4 1.6 Proposed – Comparison portion for Alternative 5D 19.4 2.4 Alternative 5D 17.5 1.5 Proposed – Comparison portion for Alternative 5E 5.8 1.0Alternative 5E 5.3 0.7

6 Proposed-Total Length 0.5 0.2 0.2 4

Note: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactly

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)

5

1E

1W

2

Table D.14-6 Page 1 of 2
Gateway West Transmission Line Draft EIS

1 to 4 4 to 8 8 to 12 T

Proposed – Total Length 118.1 17.1 22.4 6.9 Proposed – Comparison portion for Alternatives 7A,B 35.2 2.4 10.1 Alternative 7A 38.0 5.4 10.3 Alternative 7B 46.4 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 3.1 0.9 Alternative 7G 3.2 0.1 Proposed – Comparison portion for Alternatives 7H,I 118.1 17.1 22.4 6.9 Alternative 7H 127.5 8.3 18.3 7.8 Alternative 7I 173.4 13.4 37.2 29.8 Proposed – Comparison portion 7/9 for Alternative 7J 1/ 143.9 22.8 23.2 23.7 

Alternative 7J1/ 202.1 18.8 35.7 56.8 

Proposed – Total Length 131.0 25.3 76.8 9.2 Proposed – Comparison portion for Alternative 8A 51.4 12.3 21.9 4.6 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 18.5 1.9 11.9 Proposed – Total Length 161.7 72.1 33.0 30.1 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 49.5 17.2 29.5 0.1 Alternative 9B 53.2 3.0 41.7 4.4 Proposed – Comparison portion for Alternative 9C 14.7 12.9 0.1 Alternative 9C 15.3 5.2 1.8 4.4 Proposed – Comparison portion for Alternatives 9D-9H 57.2 43.3 5.0 Alternative 9D 58.4 10.6 8.0 Alternative 9E 68.7 51.0 6.3 4.2 Alternative 9F 62.9 19.7 8.0 Alternative 9G 56.4 7.5 11.1 Alternative 9H 61.0 16.5 11.1 

10 Proposed – Total Length 33.6 7.1 0.4 0.6 

78

Proposed Alternative or Route Name

Segment Length 

(Miles)

Depth to Bedrock (feet)

1/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for S

above compares 7J (202 miles) with the corresponding portion of Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alcompared to Segment 7 of the Proposed Route (118.1 miles) only.

Segment Number

Note: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactly

9

Table D.14-6. Miles of Each Depth to Shallow Bedrock Category Crossed by Proposed and Alternative Routes cont.

Table D.14-6 Page 2 of 2
Gateway West Transmission Line Draft EIS

Segment Number Proposed Alternative or Route Name

Segment Length 

(Miles) Bedrock/ Landslide1/ Bedrock/ Subsidence 

Proposed – Total Length 100.6Proposed – Comparison portion for Alternative 1E-A 17.6Alternative 1E-A 16.1Proposed – Comparison portion for Alternative 1E-B 37.9Alternative 1E-B 59.3Proposed – Comparison portion for Alternative 1E-C 75.4Alternative 1E-C 48.71W(a) Proposed – Total Length 76.5Proposed – Comparison portion for Alternative 1W-A 20.3Alternative 1W-A 16.21W(c) Proposed – Total Length 70.6Proposed – Total Length 96.7Proposed – Comparison portion for Alternative 2A 28.8Alternative 2A 28.4Proposed – Comparison portion for Alternative 2B 7.0Alternative 2B 6.2Proposed – Comparison portion for Alternative 2C 28.4Alternative 2C 24.4

3 Proposed – Total Length 56.4 13.0 17.4 

Proposed – Total Length 203.0 27.1 10.1 Proposed – Comparison portion for Alternatives 4A-4F 90.2 22.3 2.6 Alternative 4A 85.2 29.9 8.3 Alternative 4B 100.2 43.5 22.5 Alternative 4C 101.6 35.8 16.9 Alternative 4D 100.8 44.6 26.3 Alternative 4E 102.2 36.8 20.7 Alternative 4F 87.5 33.9 6.1 Proposed-Total Length 54.6Proposed – Comparison portion for Alternatives 5A,B 25.3Alternative 5A 33.7Alternative 5B 44.4Proposed – Comparison portion for Alternative 5C 33.2Alternative 5C 26.1Proposed – Comparison portion for Alternative 5D 19.4Alternative 5D 17.5Proposed – Comparison portion for Alternative 5E 5.8Alternative 5E 5.3

6 Proposed-Total Length 0.5

Note: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactly

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.

Table D.14-7. Miles of Shallow Bedrock in Landslide, Subsidence, or Coal (Methane) Zones

5

1W

24

1E

Table D.14-7 Page 1 of 2
Gateway West Transmission Line Draft EIS

Segment Number Proposed Alternative or Route Name

Segment Length 

(Miles) Bedrock/ Landslide1/ Bedrock/ Subsidence 

Proposed-Total Length 118.1Proposed – Comparison portion for Alternatives 7A,B 35.2Alternative 7A 38.0Alternative 7B 46.4Proposed – 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 3.1Alternative 7G 3.2Proposed – Comparison portion for Alternatives 7H,I 118.1Alternative 7H 127.5Alternative 7I 173.4 4.3 Proposed – Comparison portion 7/9 for Alternative 7J 3/ 143.9

Alternative 7J3/ 202.1 4.3 

Proposed – Total Length 131.0 0.8 Proposed – Comparison portion for Alternative 8A 51.4Alternative 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 7.0Alternative 8E 18.5Proposed – Total Length 161.7Proposed – Comparison portion for Alternative 9A 7.8Alternative 9A 7.7Proposed – Comparison portion for Alternative 9B 49.5Alternative 9B 53.2Proposed – Comparison portion for Alternative 9C 14.7Alternative 9C 15.3Proposed – Comparison portion for Alternatives 9D-9H 57.2Alternative 9D 58.4Alternative 9E 68.7Alternative 9F 62.9Alternative 9G 56.4Alternative 9H 61.0

10 Proposed – Total Length 33.6

Note: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactly

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.

Table D.14-7. Miles of Shallow Bedrock in Landslide, Subsidence, or Coal (Methane) Zones cont.

789

3/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for S

with the corresponding portion of Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segm

Table D.14-7 Page 2 of 2
Gateway West Transmission Line Draft 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

Compa

Pro

Proposed – Total Length 100.6 1,096 289 21 202 227 Proposed – Comparison portion for Alternative 1E-A 17.6 213 65 10 10 10 Alternative 1E-A 16.1 125 91 23 23 23 Proposed – Comparison portion for Alternative 1E-B 37.9 393 204 41 73 Alternative 1E-B 59.3 729 370 203 284 Proposed – Comparison portion for Alternative 1E-C 75.4 832 224 181 214 Alternative 1E-C 48.7 311 68 1W(a) Proposed – Total Length 76.5 623 178 7 7 7 Proposed – Comparison portion for Alternative 1W-A 20.3 210 83 Alternative 1W-A 16.2 136 101 22 22 22 1W(c) Proposed – Total Length 70.6 817 277 65 65 65 Proposed – Total Length 96.7 1,544 813 53 Proposed – Comparison portion for Alternative 2A 28.8 398 261 Alternative 2A 28.4 446 248 Proposed – Comparison portion for Alternative 2B 7.0 104 104 Alternative 2B 6.2 80 79 Proposed – Comparison portion for Alternative 2C 28.4 369 161 Alternative 2C 24.4 322 235 

3 Proposed – Total Length 56.5 863 861 248 562 

Proposed – Total Length 203.0 2,846 1,311 896 535 1,085 10Proposed – Comparison portion for Alternatives 4A-4F 90.2 1,234 672 92 98 627 10 

Alternative 4A 85.2 1,250 797 266 42 628 10 Alternative 4B 100.2 1,484 971 306 1 861 14 Alternative 4C 101.6 1,478 969 405 748 14 Alternative 4D 100.8 1,505 996 319 1 870 14 Alternative 4E 102.2 1,495 993 406 769 14 Alternative 4F 87.5 1,260 808 248 103 707 10 Proposed – Total Length 54.6 982 86 853 265 352 400 Proposed – Comparison portion for Alternatives 5A,B 25.3 439 12 390 239 191 76 Alternative 5A 33.7 554 17 464 274 237 191 Alternative 5B 44.4 683 651 302 265 246 Proposed – Comparison portion for Alternative 5C 33.2 590 12 540 184 184 260 Alternative 5C 26.1 433 42 432 91 78 83 Proposed – Comparison portion for Alternative 5D 19.4 411 74 337 30 76 330 Alternative 5D 17.5 366 68 297 2 52 296 Proposed – Comparison portion for Alternative 5E 5.8 138 74 63 46 91 

Alternative 5E 5.3 104 66 38 40 64 

6 Proposed – Total Length 0.5 65 65 63 2 

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

5

Table D.15-1. Analysis of Soil Factors in Construction Disturbance Areas (in acres)

1W

1E

42

Table D.15-1 Page 1 of 2
Gateway West Transmission Line Draft 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

Compa

Pro

Proposed – Total Length 118.1 1,804 409 1,740 364 537 1,077 Proposed – Comparison portion for Alternatives 7A,B 35.2 499 9 463 179 144 237 Alternative 7A 38.0 618 18 529 266 236 261 Alternative 7B 46.4 746 723 288 258 281 Proposed – Comparison portion for Alternative 7C 20.1 288 30 288 169 216 Alternative 7C 20.3 289 11 289 <1 131 206 Proposed – Comparison portion for Alternative 7D 6.2 112 12 112 6 55 55 Alternative 7D 6.8 126 17 125 6 71 71 Proposed – Comparison portion for Alternative 7E 3.8 67 15 67 52 15 Alternative 7E 4.5 78 7 78 68 7 Proposed – Comparison portion for Alternative 7F 10.5 201 93 201 92 93 Alternative 7F 10.8 169 26 169 89 26 Proposed – Comparison portion for Alternative 7G 3.1 48 38 48 10 38Alternative 7G 3.2 72 64 72 8 64Proposed – Comparison portion for Alternatives 7H,I 118.1 1,804 409 1,740 364 537 1,077 Alternative 7H 127.5 2,118 412 1,981 574 692 719 Alternative 7I 173.4 2,735 886 2,351 1,054 1,241 731 

Proposed – Comparison portion 7/9 for Alternative 7J 1/ 143.9 2,231 445 1,899 388 903 1,381 

Alternative 7J1/ 202.1 3,181 887 2,372 1,072 1,670 1,091 Proposed – Total Length 131.0 2,125 600 1,540 1,717 428 Proposed – Comparison portion for Alternative 8A 51.4 814 502 288 540 317 

Alternative 8A 53.6 824 535 280 242 198 

Proposed – Comparison portion for Alternative 8B 45.3 754 98 696 641 111 

Alternative 8B 45.8 779 202 727 593 357 

Alternative 8B – Comparison portion for Alternative 8C 6.5 139 138 138 Alternative 8C 6.4 138 25 138 126 25 Proposed – Comparison portion for Alternative 8D 6.9 123 123 74 5 Alternative 8D 8.1 143 142 84 6 Proposed – Comparison portion for Alternative 8E 7.0 98 49 59 69 49 

Alternative 8E 18.5 286 242 267 207 242 

Proposed – Total Length 161.7 2,670 1,233 1,224 24 1,694 891 Proposed – Comparison portion for Alternative 9A 7.8 117 63 117 54 

Alternative 9A 7.7 133 58 133 75 

Proposed – Comparison portion for Alternative 9B 49.5 825 109 672 326 44 

Alternative 9B 53.2 816 170 557 163 116 

Proposed – Comparison portion for Alternative 9C 14.7 239 196 238 20 

Alternative 9C 15.3 279 32 146 246 121 

Proposed – Comparison portion for Alternatives 9D-9H 57.2 955 813 227 793 247 

Alternative 9D 58.4 815 763 568 287 653 

Alternative 9E 68.7 1,004 441 630 770 222 

Alternative 9F 62.9 971 920 568 432 655 

Alternative 9G 56.4 848 819 559 328 706 

Alternative 9H 61.0 979 949 559 472 692 

10 Proposed – Total Length 33.6 549 267 334 229 145 

1103 15984 6389 6981 1462 6538 2943 10

9

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

1/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for Se

with the corresponding portion of Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segm

7

Total of All Proposed Segments (grey shaded areas)

Table D.15-1. Analysis of Soil Factors in Construction Disturbance Areas (in acres) cont.

8

Table D.15-1 Page 2 of 2
Gateway West Transmission Line Draft EIS

Highly Wind

Erodible

High K 

Factor

Slope 

> 25% 

Low T 

Factor

Prime 

Farmland

Compaction

Prone

Proposed – Total Length 100.6 283 72 6 54 60 Proposed – Comparison portion for Alternative 1E-A 17.6 51 18 3 3 3 

Alternative 1E-A 16.1 39 29 6 6 6 

Proposed – Comparison portion for Alternative 1E-B 37.9 91 45 10 15 

Alternative 1E-B 59.3 164 86 54 71 

Proposed – Comparison portion for Alternative 1E-C 75.4 218 54 48 54 

Alternative 1E-C 48.7 92 17 1W(a) Proposed – Total Length 76.5 182 51 2 2 2 Proposed – Comparison portion for Alternative 1W-A 20.3 47 19 Alternative 1W-A 16.2 40 30 6 6 6 

1W(c) Proposed – Total Length 70.6 144 51 11 11 11 Proposed – Total Length 96.7 401 170 9 Proposed – Comparison portion for Alternative 2A 28.8 74 44 Alternative 2A 28.4 90 50 Proposed – Comparison portion for Alternative 2B 7.0 16 16 Alternative 2B 6.2 18 18 Proposed – Comparison portion for Alternative 2C 28.4 77 35 Alternative 2C 24.4 52 34 

3 Proposed – Total Length 56.5 219 219 89 115 

Proposed – Total Length 203.0 651 323 245 124 284 18 Proposed – Comparison portion for Alternatives 4A-4F 90.2 262 147 20 26 134 2 

Alternative 4A 85.2 277 178 54 12 143 2 

Alternative 4B 100.2 348 235 68 <1 201 3 Alternative 4C 101.6 341 237 83 174 3 Alternative 4D 100.8 355 243 69 <1 210 3 Alternative 4E 102.2 345 245 83 179 3 Alternative 4F 87.5 280 183 51 28 160 2 Proposed – Total Length 54.6 175 22 144 52 93 54 Proposed – Comparison portion for Alternatives 5A,B 25.3 73 2 63 49 38 15 

Alternative 5A 33.7 87 2 69 55 50 23 

Alternative 5B 44.4 99 93 52 46 27 

Proposed – Comparison portion for Alternative 5C 33.2 94 2 85 37 37 37 

Alternative 5C 26.1 56 4 56 14 12 9 

Proposed – Comparison portion for Alternative 5D 19.4 63 20 44 3 21 40 Alternative 5D 17.5 53 21 32 1 21 28 Proposed – Comparison portion for Alternative 5E 5.8 24 20 4 19 5 Alternative 5E 5.3 24 21 4 18 6 

6 Proposed – Total Length 0.5 61 61 60 1 

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

Proposed or Alternative Name

Segment 

Number

Table D.15-2. Analysis of Soil Factors in Operations Disturbance Areas (in acres)

1W

1E

425

F

Total 

Acres

Segment

Length

(Miles)

Erosion Factors Sensitive Soils

Table D.15-2 Page 1 of 2
Gateway West Transmission Line Draft EIS

Highly Wind

Erodible

High K 

Factor

Slope 

> 25% 

Low T 

Factor

Prime 

Farmland

Compaction

Prone

Proposed – Total Length 118.1 231 41 227 45 102 108 Proposed – Comparison portion for Alternatives 7A,B 35.2 47 1 44 19 15 19 

Alternative 7A 38.0 96 3 76 51 49 28 Alternative 7B 46.4 99 94 44 42 28 

Proposed – Comparison portion for Alternative 7C 20.1 36 3 36 0 25 30 

Alternative 7C 20.3 28 28 0 15 21 Proposed – Comparison portion for Alternative 7D 6.2 11 2 11 1 4 4 Alternative 7D 6.8 13 3 13 1 5 5 Proposed – Comparison portion for Alternative 7E 3.8 6 1 6 6 1 

Alternative 7E 4.5 8 8 8 

Proposed – Comparison portion for Alternative 7F 10.5 27 13 27 12 13 Alternative 7F 10.8 24 6 24 12 6 Proposed – Comparison portion for Alternative 7G 3.1 6 4 6 2 4 Alternative 7G 3.2 6 5 6 5 Proposed – Comparison portion for Alternatives 7H,I 118.1 231 41 227 45 102 108 

Alternative 7H 127.5 340 63 314 86 143 94 

Alternative 7I 173.4 451 132 398 195 216 82 

Proposed – Comparison portion 7/9 for Alternative 7J 1/ 143.9 294 42 262 49 160 137 

Alternative 7J1/ 202.1 512 132 415 221 250 120 Proposed – Total Length 131.0 246 78 172 206 44 Proposed – Comparison portion for Alternative 8A 51.4 99 70 28 70 34 

Alternative 8A 53.6 102 73 27 41 23 Proposed – Comparison portion for Alternative 8B 45.3 87 7 84 76 11 Alternative 8B 45.8 69 10 68 55 27 Alternative 8B – Comparison portion for Alternative 8C 6.5 15 15 15 

Alternative 8C 6.4 16 16 16 

Proposed – Comparison portion for Alternative 8D 6.9 19 19 12 1 Alternative 8D 8.1 15 15 8 2 

Proposed – Comparison portion for Alternative 8E 7.0 10 5 7 8 5 Alternative 8E 18.5 27 21 25 20 21 Proposed – Total Length 161.7 359 150 181 4 222 100 Proposed – Comparison portion for Alternative 9A 7.8 15 10 15 5 

Alternative 9A 7.7 18 10 18 8 

Proposed – Comparison portion for Alternative 9B 49.5 121 22 97 36 3 Alternative 9B 53.2 85 18 55 18 12 

Proposed – Comparison portion for Alternative 9C 14.7 26 23 26 

Alternative 9C 15.3 31 2 14 29 14 

Proposed – Comparison portion for Alternatives 9D-9H 57.2 106 89 27 91 25 Alternative 9D 58.4 80 72 57 29 63 Alternative 9E 68.7 134 58 83 100 27 Alternative 9F 62.9 93 85 57 44 60 Alternative 9G 56.4 83 81 59 34 70 Alternative 9H 61.0 96 94 59 49 67 

10 Proposed – Total Length 33.6 81 40 45 51 13 

1,103 3,033 1,278 1,131 292 1,206 320 18 

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

897

Total of All Proposed Segments (grey shaded areas)

1/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for Se

corresponding portion of Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 7 of 

Segment 

Number Proposed or Alternative Name

Table D.15-2. Analysis of Soil Factors in Operations Disturbance Areas (in acres) cont.

F

Segment

Length

(Miles)

Total 

Acres

Erosion Factors Sensitive Soils

Table D.15-2 Page 2 of 2
Gateway West Transmission Line Draft EIS

Medicine Bow-Routt National Forest

Proposed – Total Length 1,096 25Proposed – Comparison Portion for Alternative 1E-C 832 25Alternative 1E-C 311 121W(a) Proposed – Total Length 623 161W(c) Proposed – Total Length 817 27

2,536 68

Caribou National Forest

4 Proposed-Total Length 2,846 116 116

2,846 116 116

Sawtooth National Forest

Proposed-Total Length 1,804Proposed – Comparison Portion for Alternatives 7H,I 1,804Alternative 7H 2,118 167 75 Alternative 7I 2,735 448 337 Proposed – Comparison portion 7/9 for Alternative 7J 1/ 2,231 <1 <1 

Alternative 7J1/ 3,180 251 158 

1,804

Note: 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 Forest Acres Highly Erodible Soil (High K Factor) 

1/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for Se

compares 7J (202 miles) with the corresponding portion of Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternativthe Proposed Route (118.1 miles) only.

7

Total of Sawtooth NF Segment 7 (grey shaded area)

1E

1W

Total of All Medicine Bow NF Segments (grey shaded areas)Total of All Caribou NF Segments (grey shaded areas)

Table D.15-3 Page 1 of 1
Gateway West Transmission Line Draft EIS

Medicine Bow National Forest

Proposed – Total Length 283 8 

Proposed – Comparison portion for Alternative 1E-C 218 8 Alternative 1E-C 97 4 1W(a) Proposed – Total Length 182 5 1W(c) Proposed – Total Length 144 4 

609 17 

Caribou National Forest

4 Proposed-Total Length 651 27 27 

651 27 27 

Sawtooth National Forest

Proposed-Total Length 231Proposed – Comparison portion for Alternatives 7H,I 231Alternative 7H 340 26 7 Alternative 7I 451 94 72 Proposed – Comparison portion 7/9 for Alternative 7J 1/ 294

Alternative 7J1/ 511 53 35 

231

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

1/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for Se

corresponding portion of Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 7 of 

Total of All Medicine Bow NF Segments (grey shaded areas)Total of All Caribou NF Segments (grey shaded areas)

7

Proposed or Alternative Name Segment Number Total Segment Acres Highly Erodible Soil (High K Factor)

Total of Sawtooth NF Segment 7 (grey shaded area)

Table D.15-4. Soil Impacts on National Forest-Operations Areas (in acres)

1W

1E

Total Forest Acres Low 

Table D.15-4 Page 1 of 1
Gateway West Transmission Line Draft EIS

Highly Wind

Erodible

High K 

Factor

Slope 

> 25% 

Low T 

Factor

Prime 

Farmland

Compaction

Prone

Proposed – Total Length 96.7 1972 1084 66 Proposed – Comparison portion for Alternative 2A 28.8 520 342 Alternative 2A 28.4 570 311 Proposed – Comparison portion for Alternative 2B 7.0 144 144 Alternative 2B 6.2 114 114 Proposed – Comparison portion for Alternative 2C 28.4 489 218 Alternative 2C 24.4 417 287 

3 Proposed – Total Length 56.5 1081 1079 294 728 

Proposed – Total Length 203.0 3706 1672 1165 708 1488 151 Proposed – Comparison portion for Alternatives 4A-4F 90.2 1601 852 127 120 807 23 Alternative 4A 85.2 1634 1032 358 58 830 23 Alternative 4B 100.2 1936 1247 413 2 1115 28 Alternative 4C 101.6 1931 1244 550 964 28 Alternative 4D 100.8 1946 1261 428 2 1122 28 Alternative 4E 102.2 1937 1257 551 967 28 Alternative 4F 87.5 1646 1043 337 125 904 23 

1/ These areas compare with the areas for the same segments shown in Table D.15-1 in Appendix D

F

Total 

Acres

Segment

Length

(Miles)

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

Table D.15-5. Analysis of Soil Factors in Construction of Two Single-Circuit Alternative Areas (in acres)1/

42

Erosion Factors Sensitive Soils

Proposed or Alternative Name

Segment 

Number

Table D.15-5 Page 1 of 1
Gateway West Transmission Line Draft EIS

Table D.16-1. Surface Water Road Crossings by Crossing Type 

Ephemeral Ephemeral Ephemeral 

Intermittent 

Dry

Intermittent 

Dry

Intermittent 

Dry 

Intermittent 

Dry 

Intermittent 

Wet 

Intermitten

Wet 

Drive 

Through Cut/Fill TMDL/ 303(d) Drive Through Cut/Fill Temporary Culvert TMDL/ 303(d) Avoid Temporary Culvert 

Proposed – Total Length 100.6 319 126 106 14 38 25 Proposed – Comparison portion for Alternative 1E-A 17.6 18 5 5 2 4 1 Alternative 1E-A 16.1 34 7 5 3 9 5 Proposed – Comparison portion for Alternative 1E-B 37.9 92 45 38 2 4 3 Alternative 1E-B 59.3 135 53 44 3 9 18 Proposed – Comparison portion for Alternative 1E-C 75.4 282 114 99 10 31 19 Alternative 1E-C 48.7 103 41 35 5 12 9 1W(a) Proposed – Total Length 76.5 165 65 55 8 19 14 Proposed – Comparison portion for Alternative 1W-A 20.3 23 6 5 3 7 2 Alternative 1W-A 16.2 26 3 3 3 8 6 1W(c) Proposed – Total Length 70.6 198 76 56 13 31 12 Proposed – Total Length 96.7 276 143 104 0 1 12 1 Proposed – Comparison portion for Alternative 2A 28.8 62 33 24 4 Alternative 2A 28.4 78 41 30 3 2 Proposed – Comparison portion for Alternative 2B 7.0 9 5 3 1 Alternative 2B 6.2 15 8 5 1 Proposed – Comparison portion for Alternative 2C 28.4 70 34 25 1 9 1 Alternative 2C 24.4 17 4 3 6 3 

3 Proposed – Total Length 56.5 127 46 38 6 13 18 

Proposed – Total Length 203.0 414 140 147 3 14 32 20 Proposed – Comparison portion for Alternatives 4A-4F 90.2 224 90 87 1 7 15 10 Alternative 4A 85.2 242 58 57 1 23 55 10 Alternative 4B 100.2 375 121 118 1 16 38 50 Alternative 4C 101.6 354 111 116 1 17 38 43 Alternative 4D 100.8 413 140 137 1 16 38 50 Alternative 4E 102.2 387 132 128 1 16 39 43 Alternative 4F 87.5 220 55 54 1 16 36 4 Proposed – Total Length 54.6 177 91 39 40 Proposed – Comparison portion for Alternatives 5A,B 25.3 88 38 16 34 Alternative 5A 33.7 84 24 10 19 6 4 1 12 Alternative 5B 44.4 103 41 18 21 8 5 3 Proposed – Comparison portion for Alternative 5C 33.2 147 74 32 40 Alternative 5C 26.1 52 27 12 8 1 1 Proposed – Comparison portion for Alternative 5D 19.4 75 47 20 6 Alternative 5D 17.5 51 27 11 6 2 2 Proposed – Comparison portion for Alternative 5E 5.8 5 3 1 Alternative 5E 5.3 6 3 2 

6 Proposed – Total Length 0.5

1W

1E

245

Number of Crossings

2/ These nine crossings are not all perennial; some will require a permanent culvert

Note: 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)

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

Total 

Crossings

Table D.16-1 1 of 2
Gateway West Transmission Line Draft EIS

Table D.16-1. Surface Water Road Crossings by Crossing Type cont.

Ephemeral Ephemeral Ephemeral 

Intermittent 

Dry

Intermittent 

Dry

Intermittent 

Dry 

Intermittent 

Dry 

Intermittent 

Wet 

Intermitten

Wet 

Drive 

Through Cut/Fill TMDL/ 303(d) Drive Through Cut/Fill Temporary Culvert TMDL/ 303(d) Avoid Temporary Culvert 

Proposed – Total Length 118.1 209 50 73 15 12 5 Proposed – Comparison portion for Alternatives 7A,B 35.2 43 14 14 15 Alternative 7A 38.0 110 24 23 25 4 8 3 12 Alternative 7B 46.4 101 27 29 25 3 8 1 Proposed – Comparison portion for Alternative 7C 20.1 17 4 4 Alternative 7C 20.3 24 11 11 1 Proposed – Comparison portion for Alternative 7D 6.2 17 5 5 1 2 Alternative 7D 6.8 18 4 5 1 2 Proposed – Comparison portion for Alternative 7E 3.8 6 Alternative 7E 4.5 7 Proposed – Comparison portion for Alternative 7F 10.5 38 4 3 2 6 1 Alternative 7F 10.8 19 4 4 2 4 1 Proposed – Comparison portion for Alternative 7G 3.1 4 2 1 1 Alternative 7G 3.2Proposed – Comparison portion for Alternatives 7H,I 118.1 209 60 63 15 4 8 5 Alternative 7H 127.5 448 134 141 10 27 64 7 Alternative 7I 173.4 525 175 184 19 23 53 1 13 Proposed – Comparison portion 7/9 for Alternative 7J 3/ 143.9 257 70 73 18 5 12 6 Alternative 7J3/ 202.1 536 153 223 19 85 1 9 Proposed – Total Length 131.0 259 106 51 26 7 15 2 Proposed – Comparison portion for Alternative 8A 51.4 57 16 8 1 1 2 Alternative 8A 53.6 55 12 6 1 1 3 Proposed – Comparison portion for Alternative 8B 45.3 112 47 23 25 3 6 2 Alternative 8B 45.8 18 8 4 3 1 2 Proposed – Comparison portion for Alternative 8C 6.5 18 8 4 3 1 2 Alternative 8C 6.4 21 12 6 2 1 Proposed – Comparison portion for Alternative 8D 6.9 8 1 6 Alternative 8D 8.1 8 2 1 4 Proposed – Comparison portion for Alternative 8E 7.0 6 1 Alternative 8E 18.5 12 7 3 1 1 Proposed – Total Length 161.7 322 107 83 14 4 9 7 5 16 Proposed – Comparison portion for Alternative 9A 7.8 16 3 4 Alternative 9A 7.7 13 1 1 Proposed – Comparison portion for Alternative 9B 49.5 69 18 19 8 3 6 4 6 Alternative 9B 53.2 58 18 18 4 2 Proposed – Comparison portion for Alternative 9C 14.7 27 12 12 Alternative 9C 15.3 21 4 3 1 Proposed – Comparison portion for Alternatives 9D-9H 57.2 136 37 39 1 2 4 1 Alternative 9D 58.4 45 20 19 5 Alternative 9E 68.7 139 60 47 18 1 Alternative 9F 62.9 57 26 20 6 Alternative 9G 56.4 35 15 11 6 Alternative 9H 61.0 47 19 14 7 

10 Proposed – Total Length 33.6 25 13 1 1 1 

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

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

78

Number of Crossings

Total 

Crossings

3/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for Segment 9. Th

Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 7 of the Proposed Route (118.1 miles) only.

9

Segment 

Number Proposed or Alternative Name

Segment 

Length 

(Miles)

Table D.16-1 2 of 2
Gateway West Transmission Line Draft 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 

Low Risk Moderate Risk 

Proposed – Total Length 100.6 991 28 Proposed – Comparison portion for Alternative 1E-A 17.6 165 13 Alternative 1E-A 16.1 102 12 Proposed – Comparison portion for Alternative 1E-B 37.9 377 15Alternative 1E-B 59.3 666 36 Proposed – Comparison portion for Alternative 1E-C 75.4 777 15 Alternative 1E-C 48.7 310 1W(a) Proposed – Total Length 76.5 554 17 Proposed – Comparison portion for Alternative 1W-A 20.3 170 11 Alternative 1W-A 16.2 116 11 1W(c) Proposed – Total Length 70.6 767 5 Proposed – Total Length 96.7 1345 19 Proposed – Comparison portion for Alternative 2A 28.8 335 2 Alternative 2A 28.4 370 4 Proposed – Comparison portion for Alternative 2B 7.0 93 2 Alternative 2B 6.2 62 3 Proposed – Comparison portion for Alternative 2C 28.4 367 Alternative 2C 24.4 293 6 

3 Proposed – Total Length 56.5 792 70

Proposed – Total Length 203.0 2121 512 Proposed – Comparison portion for Alternatives 4A-4F 90.2 667 424 Alternative 4A 85.2 916 194 Alternative 4B 100.2 1111 237 Alternative 4C 101.6 1140 220 Alternative 4D 100.8 1136 233 Alternative 4E 102.2 1156 220 Alternative 4F 87.5 971 149 Proposed – Total Length 54.6 619 257 Proposed – Comparison portion for Alternatives 5A,B 25.3 400 5 Alternative 5A 33.7 457 33 Alternative 5B 44.4 584 31 Proposed – Comparison portion for Alternative 5C 33.2 343 186 Alternative 5C 26.1 279 80 Proposed – Comparison portion for Alternative 5D 19.4 80 252 Alternative 5D 17.5 31 187 Proposed – Comparison portion for Alternative 5E 5.8 13 79 Alternative 5E 5.3 13 60 

6 Proposed – Total Length 0.5 44 21

Segment Number Proposed or Alternative Name

1E

1W

4

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

Flood Hazard Rank

52

Segment Length (Miles)

Table D.16-2 Page 1 of 2
Gateway West Transmission Line Draft 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 

Low Risk Moderate Risk 

Proposed – Total Length 118.1 1414 234 Proposed – Comparison portion for Alternatives 7A,B 35.2 297 128 Alternative 7A 38.0 466 76 Alternative 7B 46.4 561 72 Proposed – Comparison portion for Alternative 7C 20.1 184 44 Alternative 7C 20.3 198 62 Proposed – Comparison portion for Alternative 7D 6.2 78 32 Alternative 7D 6.8 86 32 Proposed – Comparison portion for Alternative 7E 3.8 67Alternative 7E 4.5 78Proposed – Comparison portion for Alternative 7F 10.5 201Alternative 7F 10.8 169Proposed – Comparison portion for Alternative 7G 3.1 48Alternative 7G 3.2 72Proposed – Comparison portion for Alternatives 7H,I 118.1 1414 234 Alternative 7H 127.5 1997 16 Alternative 7I 173.4 2587 43 Proposed – Comparison portion 7/9 for Alternative 7J 1/ 143.9 1840 234 

Alternative 7J1/ 202.1 3030 43 

Proposed – Total Length 131.0 1814 39 Proposed – Comparison portion for Alternative 8A 51.4 706 8 Alternative 8A 53.6 699 18 Proposed – Comparison portion for Alternative 8B 45.3 619 19 Alternative 8B 45.8 617 Proposed – Comparison portion for Alternative 8C 6.5 138Alternative 8C 6.4 138Proposed – Comparison portion for Alternative 8D 6.9 76 Alternative 8D 8.1 71 Proposed – Comparison portion for Alternative 8E 7.0 72 Alternative 8E 18.5 242 14 Proposed – Total Length 161.7 2162 221 Proposed – Comparison portion for Alternative 9A 7.8 117Alternative 9A 7.7 133Proposed – Comparison portion for Alternative 9B 49.5 663 52 Alternative 9B 53.2 662 5 Proposed – Comparison portion for Alternative 9C 14.7 138 52 Alternative 9C 15.3 169 9 Proposed – Comparison portion for Alternatives 9D-9H 57.2 737 77 Alternative 9D 58.4 657 61 Alternative 9E 68.7 797 144 Alternative 9F 62.9 769 75 Alternative 9G 56.4 678 42 Alternative 9H 61.0 770 56 

10 Proposed – Total Length 33.6 500 

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

Segment Length (Miles)

9

1/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for S

above compares 7J (202 miles) with the corresponding portion of Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alcompared to Segment 7 of the Proposed Route (118.1 miles) only.

87

Flood Hazard Rank

Segment Number Proposed or Alternative Name

Table D.16-2 Page 2 of 2
Gateway West Transmission Line Draft 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 

Proposed – Total Length 100.6 245 9 Proposed – Comparison portion for Alternative 1E-A 17.6 35 5 

Alternative 1E-A 16.1 29 7 

Proposed – Comparison portion for Alternative 1E-B 37.9 86 4

Alternative 1E-B 59.3 154 6 

Proposed – Comparison portion for Alternative 1E-C 75.4 195 4 

Alternative 1E-C 48.7 82 

1W(a) Proposed – Total Length 76.5 150 8 

Proposed – Comparison portion for Alternative 1W-A 20.3 37 4 

Alternative 1W-A 16.2 34 3 

1W(c) Proposed – Total Length 70.6 127 <1 

Proposed – Total Length 96.7 313 5 

Proposed – Comparison portion for Alternative 2A 28.8 60 <1 

Alternative 2A 28.4 71 1 

Proposed – Comparison portion for Alternative 2B 7.0 15 <1 

Alternative 2B 6.2 15 <1 

Proposed – Comparison portion for Alternative 2C 28.4 77 

Alternative 2C 24.4 48 1 

3 Proposed – Total Length 56.5 209 10

Proposed – Total Length 203.0 512 101 Proposed – Comparison portion for Alternatives 4A-4F 90.2 148 85 

Alternative 4A 85.2 211 38 

Alternative 4B 100.2 271 46 Alternative 4C 101.6 272 42 Alternative 4D 100.8 278 46 Alternative 4E 102.2 275 42 Alternative 4F 87.5 221 30 

Proposed – Total Length 54.6 126 37 

Proposed – Comparison portion for Alternatives 5A,B 25.3 66 2 

Alternative 5A 33.7 67 7 

Alternative 5B 44.4 85 6 

Proposed – Comparison portion for Alternative 5C 33.2 57 27 

Alternative 5C 26.1 38 7 

Proposed – Comparison portion for Alternative 5D 19.4 21 36 

Alternative 5D 17.5 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

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

1E

4

1W

52

Segment Number Proposed or Alternative Name

Flood Haza

Segment Length (Miles)

Table D.16-3 Page 1 of 2
Gateway West Transmission Line Draft 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 118.1 195 18 Proposed – Comparison portion for Alternatives 7A,B 35.2 29 9 

Alternative 7A 38.0 72 9 

Alternative 7B 46.4 81 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 8 2 Alternative 7D 6.8 83Proposed – Comparison portion for Alternative 7E 3.8 6Alternative 7E 4.5 8Proposed – Comparison portion for Alternative 7F 10.5 27

Alternative 7F 10.8 24

Proposed – Comparison portion for Alternative 7G 3.1 6Alternative 7G 3.2 6Proposed – Comparison portion for Alternatives 7H,I 118.1 195 18 Alternative 7H 127.5 325 4 Alternative 7I 173.4 431 9 Proposed – Comparison portion 7/9 for Alternative 7J 1/ 143.9 258 18 

Alternative 7J1/ 202.1 492 9 

Proposed – Total Length 131.0 207 6 Proposed – Comparison portion for Alternative 8A 51.4 85 2 

Alternative 8A 53.6 92 1 

Proposed – Comparison portion for Alternative 8B 45.3 70 3 

Alternative 8B 45.8 53 

Proposed – Comparison portion for Alternative 8C 6.5 15

Alternative 8C 6.4 16

Proposed – Comparison portion for Alternative 8D 6.9 13 

Alternative 8D 8.1 8 

Proposed – Comparison portion for Alternative 8E 7.0 7 Alternative 8E 18.5 23 2 

Proposed – Total Length 161.7 297 28 Proposed – Comparison portion for Alternative 9A 7.8 15

Alternative 9A 7.7 18

Proposed – Comparison portion for Alternative 9B 49.5 105 6 

Alternative 9B 53.2 73 <1 

Proposed – Comparison portion for Alternative 9C 14.7 19 6 

Alternative 9C 15.3 22 <1 

Proposed – Comparison portion for Alternatives 9D-9H 57.2 81 9 

Alternative 9D 58.4 66 5 

Alternative 9E 68.7 99 21 

Alternative 9F 62.9 75 7 

Alternative 9G 56.4 70 2 

Alternative 9H 61.0 80 5 

10 Proposed – Total Length 33.6 75 

78

Segment Number

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

1/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for S

(202 miles) with the corresponding portion of Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compa(118.1 miles) only.

9

Proposed or Alternative Name

Flood Haza

Segment Length (Miles)

Table D.16-3 Page 2 of 2
Gateway West Transmission Line Draft EIS

Table D.16-4. Flood Hazard Risk (in Acres per Risk Rank) in Two Single-Circuit Alternatives

0 to 69 70 to 8

Low Risk Moderate 

Proposed – Total Length 96.7 1759 20 Proposed – Comparison portion for Alternative 2A 28.8 450 2 Alternative 2A 28.4 474 5 Proposed – Comparison portion for Alternative 2B 7.0 131 2 Alternative 2B 6.2 81 4 Proposed – Comparison portion for Alternative 2C 28.4 487 Alternative 2C 24.4 384 7 

3 Proposed – Total Length 56.5 1000 80

Proposed – Total Length 203.0 2770 655 Proposed – Comparison portion for Alternatives 4A-4F 90.2 855 544 Alternative 4A 85.2 1199 240 Alternative 4B 100.2 1438 311 Alternative 4C 101.6 1484 290 Alternative 4D 100.8 1451 306 Alternative 4E 102.2 1490 290 Alternative 4F 87.5 1261 189 

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

Proposed or Alternative Name

Flood Hazar

Segment Length (Miles)

42

Segment Number

Table D.16-4 Page 1 of 1
Gateway West Transmission Line Draft 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 

Proposed – Total Length 100.6 71 Proposed – Comparison portion for Alternative 1E-A 17.6 65 Alternative 1E-A 16.1 32 Proposed – Comparison portion for Alternative 1E-B 37.9 2 Alternative 1E-B 59.3 17 Proposed – Comparison portion for Alternative 1E-C 75.4 5 Alternative 1E-C 48.7 3 1W(a) Proposed – Total Length 76.5 71 Proposed – Comparison portion for Alternative 1W-A 20.3 63 Alternative 1W-A 16.2 61 1W(c) Proposed – Total Length 70.6 101 Proposed – Total Length 96.7 36 Proposed – Comparison portion for Alternative 2A 28.8 6 Alternative 2A 28.4 8 Proposed – Comparison portion for Alternative 2B 7.0 4 Alternative 2B 6.2 13 Proposed – Comparison portion for Alternative 2C 28.4 8 Alternative 2C 24.4 7 

3 Proposed – Total Length 56.5 27 

Proposed – Total Length 203.0 121 Proposed – Comparison portion for Alternatives 4A-4F 90.2 10 Alternative 4A 85.2 22 

Alternative 4B 100.2 28 Alternative 4C 101.6 41 Alternative 4D 100.8 28 Alternative 4E 102.2 41 Alternative 4F 87.5 24 Proposed – Total Length 54.6 130 Proposed – Comparison portion for Alternatives 5A,B 25.3 41 Alternative 5A 33.7 26 Alternative 5B 44.4 28 Proposed – Comparison portion for Alternative 5C 33.2 29 Alternative 5C 26.1 29 Proposed – Comparison portion for Alternative 5D 19.4 25 Alternative 5D 17.5 102 Proposed – Comparison portion for Alternative 5E 5.8 21 Alternative 5E 5.3 17 

6 Proposed – Total Length 0.5 5 

1E

245

1W

Table D.16-5 Page 1 of 2
Gateway West Transmission Line Draft EIS

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

Segment Number Proposed or Alternative Name Segment Length (Miles) Surface Water Diversions 

Proposed – Total Length 118.1 700 Proposed – Comparison portion for Alternatives 7A,B 35.2 51 Alternative 7A 38.0 59 Alternative 7B 46.4 31 Proposed – Comparison portion for Alternative 7C 20.1 57 Alternative 7C 20.3 62 Proposed – Comparison portion for Alternative 7D 6.2 67 Alternative 7D 6.8 66 Proposed – Comparison portion for Alternative 7E 3.8 10 Alternative 7E 4.5 7 Proposed – Comparison portion for Alternative 7F 10.5 56 Alternative 7F 10.8 13 Proposed – Comparison portion for Alternative 7G 3.1 54 Alternative 7G 3.2 57 Proposed – Comparison portion for Alternatives 7H,I 118.1 700 Alternative 7H 127.5 1082 Alternative 7I 173.4 784 Proposed – Comparison portion 7/9 for Alternative 7J 1/ 143.9 977 Alternative 7J1/ 202.1 668 

Proposed – Total Length 131.0 327 Proposed – Comparison portion for Alternative 8A 51.4 160 Alternative 8A 53.6 607 Proposed – Comparison portion for Alternative 8B 45.3 91 Alternative 8B 45.8 264 Proposed – Comparison portion for Alternative 8C 6.5 11 Alternative 8C 6.4 23 Proposed – Comparison portion for Alternative 8D 6.9 Alternative 8D 8.1 107 Proposed – Comparison portion for Alternative 8E 7.0 11 Alternative 8E 18.5 3 Proposed – Total Length 161.7 724 Proposed – Comparison portion for Alternative 9A 7.8 19 Alternative 9A 7.7 26 Proposed – Comparison portion for Alternative 9B 49.5 30 Alternative 9B 53.2 92 Proposed – Comparison portion for Alternative 9C 14.7 18 Alternative 9C 15.3 70 Proposed – Comparison portion for Alternatives 9D-9H 57.2 299 Alternative 9D 58.4 191 Alternative 9E 68.7 107 Alternative 9F 62.9 168 Alternative 9G 56.4 193 Alternative 9H 61.0 170 

10 Proposed – Total Length 33.6 145 

1/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for S

(202 miles) with the corresponding portion of Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compaRoute (118.1 miles) only.

87

Source: IDWR

9

Table D.16-5 Page 2 of 2
Gateway West Transmission Line Draft 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

Proposed – Total Length 100.6 8 25 52 232 Proposed – Comparison portion for Alternative 1E-A 17.6 1 6 10 Alternative 1E-A 16.1 5 12 12 Proposed – Comparison portion for Alternative 1E-B 37.9 3 6 83 Alternative 1E-B 59.3 7 18 12 97 Proposed – Comparison portion for Alternative 1E-C 75.4 8 19 41 213 Alternative 1E-C 48.7 9 17 76 1W(a) Proposed – Total Length 76.5 4 14 27 120 Proposed – Comparison portion for Alternative 1W-A 20.3 2 10 11 Alternative 1W-A 16.2 6 11 6 1W(c) Proposed – Total Length 70.6 5 12 44 132 Proposed – Total Length 96.7 9 1 13 247 Proposed – Comparison portion for Alternative 2A 28.8 4 57 Alternative 2A 28.4 2 3 71 Proposed – Comparison portion for Alternative 2B 7.0 1 8 Alternative 2B 6.2 1 13 Proposed – Comparison portion for Alternative 2C 28.4 1 10 59 Alternative 2C 24.4 3 6 7 

3 Proposed – Total Length 56.5 6 18 19 84 

Proposed – Total Length 203.0 45 20 46 287 3 Proposed – Comparison portion for Alternatives 4A-4F 90.2 7 10 22 177 1 Alternative 4A 85.2 25 10 78 115 1 Alternative 4B 100.2 13 50 54 239 1 Alternative 4C 101.6 11 43 55 227 1 Alternative 4D 100.8 13 50 54 277 1 Alternative 4E 102.2 11 43 55 260 1 Alternative 4F 87.5 44 4 52 109 1 Proposed – Total Length 54.6 130 40 

Proposed – Comparison portion for Alternatives 5A,B 25.3 54 34 

Alternative 5A 33.7 8 12 10 1 34 19 Alternative 5B 44.4 7 3 13 59 21 

Proposed – Comparison portion for Alternatives 5C 33.2 106 40 

Alternative 5C 26.1 2 39 8 

Proposed – Comparison portion for Alternatives 5D 19.4 67 6 

Alternative 5D 17.5 4 38 6 

Proposed – Comparison portion for Alternatives 5E 5.8 4 

Alternative 5E 5.3 5 

6 Proposed – Total Length 0.5

1/ Artificial = pipe, aqueduct, canal, drain, ditch or artificial path (natural stream channelized into pipe, ditch or culvert)

45

2

Segment 

Proposed or Alternative Name Length (Miles)

Perennial

Intermittent - 

Wet Intermittent - Dry Epheme

Segment 

Number

1E

1W

Table D.16-6 1 of 2
Gateway West Transmission Line Draft 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

Proposed – Total Length 118.1 22 5 12 123 15 

Proposed – Comparison portion for Alternatives 7A,B 35.2 28 15 

Alternative 7A 38.0 10 12 12 3 47 25 Alternative 7B 46.4 8 1 11 56 25 

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 6 

Alternative 7E 4.5 7 

Proposed – Comparison portion for Alternative 7F 10.5 20 1 8 7 

Alternative 7F 10.8 4 1 6 8 

Proposed – Comparison portion for Alternative 7G 3.1 1 3 

Alternative 7G 3.2

Proposed – Comparison portion for Alternatives 7H,I 118.1 22 5 12 213 15 

Alternative 7H 127.5 30 7 91 275 10 Alternative 7I 173.4 27 4 8 13 76 1 359 11 

Proposed – Comparison portion 7/9 for Alternative 7J 2/ 143.9 24 6 17 143 15 

Alternative 7J2/ 202.1 18 8 9 85 1 376 11 

Proposed – Total Length 131.0 12 1 22 2 157 26 

Proposed – Comparison portion for Alternative 8A 51.4 8 3 24 1 

Alternative 8A 53.6 4 4 18 1 

Proposed – Comparison portion for Alternative 8B 45.3 9 2 70 25 

Alternative 8B 45.8 1 2 12 3 

Proposed – Comparison portion for Alternative 8C 6.5 1 2 12 3 

Alternative 8C 6.4 1 18 2 

Proposed – Comparison portion for Alternative 8D 6.9 1 6 

Alternative 8D 8.1 3 4 

Proposed – Comparison portion for Alternative 8E 7.0 1 

Alternative 8E 18.5 2 10 

Proposed – Total Length 161.7 4 1 16 20 5 190 10 

Proposed – Comparison portion for Alternative 9A 7.8 2 7 

Alternative 9A 7.7 4 1 2 

Proposed – Comparison portion for Alternative 9B 49.5 2 6 9 4 37 8 

Alternative 9B 53.2 2 2 36 4 

Proposed – Comparison portion for Alternative 9C 14.7 24 

Alternative 9C 15.3 1 7 1 

Proposed – Comparison portion for Alternatives 9D-9H 57.2 1 5 1 76 

Alternative 9D 58.4 39 5 Alternative 9E 68.7 7 2 11 107 12 Alternative 9F 62.9 46 5 Alternative 9G 56.4 26 6 Alternative 9H 61.0 33 6 

10 Proposed – Total Length 33.6 3 13 

115 1 0 111 1 258 7 0 1715 94 

Source: DEQ

1/ Artificial = pipe, aqueduct, canal, drain, ditch or artificial path (natural stream channelized into pipe, ditch or culvert)2/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for S

portion of Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 7 of the Proposed 

Total of Proposed Only

789

Perennial 

Intermittent - 

Wet Intermittent - Dry Epheme

Segment 

Number Proposed or Alternative Name

Segment 

Length (Miles)

Table D.16-6 2 of 2
Gateway West Transmission Line Draft 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 f

Proposed – Total Length 100.6 Proposed – Comparison portion for Alternative 1E-A 17.6 Alternative 1E-A 16.1 Proposed – Comparison portion for Alternative 1E-B 37.9 Alternative 1E-B 59.3 Proposed – Comparison portion for Alternative 1E-C 75.4 Alternative 1E-C 48.7 1W(a) Proposed – Total Length 76.5 Proposed – Comparison portion for Alternative 1W-A 20.3 Alternative 1W-A 16.2 1W(c) Proposed – Total Length 70.6 Proposed – Total Length 96.7 Proposed – Comparison portion for Alternative 2A 28.8 Alternative 2A 28.4 Proposed – Comparison portion for Alternative 2B 7.0 Alternative 2B 6.2 Proposed – Comparison portion for Alternative 2C 28.4 Alternative 2C 24.4 

3 Proposed – Total Length 56.5 

Proposed – Total Length 203.0 130 Proposed – Comparison portion for Alternatives 4A-4F 90.2 36 Alternative 4A 85.2 64 21 Alternative 4B 100.2 64 38 Alternative 4C 101.6 51 26 Alternative 4D 100.8 60 38 Alternative 4E 102.2 51 22 Alternative 4F 87.5 59 21 Proposed – Total Length 54.6 12 Proposed – Comparison portion for Alternatives 5A,B 25.3 12 Alternative 5A 33.7 17 Alternative 5B 44.4 Proposed – Comparison portion for Alternatives 5C 33.2 12 Alternative 5C 26.1 31 Proposed – Comparison portion for Alternatives 5D 19.4 Alternative 5D 17.5 Proposed – Comparison portion for Alternatives 5E 5.8 Alternative 5E 5.3 

6 Proposed – Total Length 0.5 

Segment Number Proposed or Alternative Name

Depth to Gro

1E

1W

2

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

45

Segment Length (Miles)

Table D.16-7 Page 1 of 2
Gateway West Transmission Line Draft 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 f

Proposed – Total Length 118.1 25 9 Proposed – Comparison portion for Alternatives 7A,B 35.2 25 9 Alternative 7A 38.0 13 18 Alternative 7B 46.4 29 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 3.1 Alternative 7G 3.2 Proposed – Comparison portion for Alternatives 7H,I 118.1 25 9 Alternative 7H 127.5 2 Alternative 7I 173.4 2 Proposed – Comparison portion 7/9 for Alternative 7J 1/ 143.9 25 9 Alternative 7J1/ 202.1 2 

Proposed – Total Length 131.0 Proposed – Comparison portion for Alternative 8A 51.4 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 18.5 Proposed – Total Length 161.7 Proposed – Comparison portion for Alternative 9A 7.8 Alternative 9A 7.7 Proposed – Comparison portion for Alternative 9B 49.5 Alternative 9B 53.2 Proposed – Comparison portion for Alternative 9C 14.7 Alternative 9C 15.3 Proposed – Comparison portion for Alternatives 9D-9H 57.2 Alternative 9D 58.4 Alternative 9E 68.7 Alternative 9F 62.9 Alternative 9G 56.4 Alternative 9H 61.0 

10 Proposed – Total Length 33.6 

Source: STATSGO

89

Segment Length (Miles)

7

Depth to Gro

Segment Number Proposed or Alternative Name

1/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for S

portion of Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 7 of the Proposed 

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

Table D.16-7 Page 2 of 2
Gateway West Transmission Line Draft 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 1

Proposed – Total Length 100.6 Proposed – Comparison portion for Alternative 1E-A 17.6 Alternative 1E-A 16.1 Proposed – Comparison portion for Alternative 1E-B 37.9 Alternative 1E-B 59.3 Proposed – Comparison portion for Alternative 1E-C 75.4 Alternative 1E-C 48.7 1W(a) Proposed – Total Length 76.5 Proposed – Comparison portion for Alternative 1W-A 20.3 Alternative 1W-A 16.2 1W(c) Proposed – Total Length 70.6 Proposed – Total Length 96.7 Proposed – Comparison portion for Alternative 2A 28.8 Alternative 2A 28.4 Proposed – Comparison portion for Alternative 2B 7.0 Alternative 2B 6.2 Proposed – Comparison portion for Alternative 2C 28.4 Alternative 2C 24.4 

3 Proposed – Total Length 56.5 

Proposed – Total Length 203.0 25 Proposed – Comparison portion for Alternatives 4A-4F 90.2 9 Alternative 4A 85.2 9 4 Alternative 4B 100.2 9 9 Alternative 4C 101.6 7 7 Alternative 4D 100.8 9 7 Alternative 4E 102.2 7 5 Alternative 4F 87.5 9 4 Proposed – Total Length 54.6 2 Proposed – Comparison portion for Alternatives 5A,B 25.3 2 Alternative 5A 33.7 2 Alternative 5B 44.4 Proposed – Comparison portion for Alternatives 5C 33.2 2 Alternative 5C 26.1 Proposed – Comparison portion for Alternatives 5D 19.4 Alternative 5D 17.5 Proposed – Comparison portion for Alternatives 5E 5.8 Alternative 5E 5.3 

6 Proposed – Total Length 0.5 

Segment Number Proposed or Alternative Name Segment Length (Miles) 

5

1W

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

Depth to G

2

4

1E

Table D.16-8 Page 1 of 2
Gateway West Transmission Line Draft 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 1

Proposed – Total Length 118.1 2 Proposed – Comparison portion for Alternatives 7A,B 35.2 2 Alternative 7A 38.0 1 Alternative 7B 46.4 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 3.1 Alternative 7G 3.2 Proposed – Comparison portion for Alternatives 7H,I 118.1 2 Alternative 7H 127.5 <1 Alternative 7I 173.4 <1 Proposed – Comparison portion 7/9 for Alternative 7J 1/ 143.9 2 Alternative 7J1/ 202.1 <1 

Proposed – Total Length 131.0 Proposed – Comparison portion for Alternative 8A 51.4 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 18.5 Proposed – Total Length 161.7 Proposed – Comparison portion for Alternative 9A 7.8 Alternative 9A 7.7 Proposed – Comparison portion for Alternative 9B 49.5 Alternative 9B 53.2 Proposed – Comparison portion for Alternative 9C 14.7 Alternative 9C 15.3 Proposed – Comparison portion for Alternatives 9D-9H 57.2 Alternative 9D 58.4 Alternative 9E 68.7 Alternative 9F 62.9 Alternative 9G 56.4 Alternative 9H 61.0 

10 Proposed – Total Length 33.6 

Source: STATSGO

Segment Length (Miles)

8

Depth to G

7

1/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for S

of Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 7 of the Proposed Route (Note: Acreages have been rounded to the nearest whole acre; therefore, numbers are inexact and columns/rows may not sum exactly

9

Segment Number Proposed or Alternative Name

Table D.16-8 Page 2 of 2
Gateway West Transmission Line Draft EIS

Table D.16-9. Potential Two Single-Circuit Alternatives Construction Disturbance (in Acres per Depth Range) in Areas Containing Shallow 

1 to 4 feet 4 to 7 feet 7 to 1

Proposed – Total Length 96.7 Proposed – Comparison portion for Alternative 2A 28.8 Alternative 2A 28.4 Proposed – Comparison portion for Alternative 2B 7.0 Alternative 2B 6.2 Proposed – Comparison portion for Alternative 2C 28.4 Alternative 2C 24.4 

3 Proposed – Total Length 56.5 

Proposed – Total Length 203.0 193 Proposed – Comparison portion for Alternatives 4A-4F 90.2 65 Alternative 4A 85.2 82 24 Alternative 4B 100.2 94 67 Alternative 4C 101.6 67 54 Alternative 4D 100.8 89 54 Alternative 4E 102.2 67 36 Alternative 4F 87.5 76 24 

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

4

Source: STATSGO

Segment Number Proposed or Alternative Name 

Depth to Gr

2

Segment Length (Miles)

Table D.16-9 Page 1 of 1
Gateway West Transmission Line Draft 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 W

Proposed – Total Length 100.6 Proposed – Comparison portion for Alternative 1E-A 17.6 Alternative 1E-A 16.1 Proposed – Comparison portion for Alternative 1E-B 37.9Alternative 1E-B 59.3 Proposed – Comparison portion for Alternative 1E-C 75.4 Alternative 1E-C 48.7 1W(a) Proposed – Total Length 76.5 Proposed – Comparison portion for Alternative 1W-A 20.3 Alternative 1W-A 16.2 1W(c) Proposed – Total Length 70.6 Proposed – Total Length 96.7 Proposed – Comparison portion for Alternative 2A 28.8 Alternative 2A 28.4 Proposed – Comparison portion for Alternative 2B 7.0 Alternative 2B 6.2 Proposed – Comparison portion for Alternative 2C 28.4 Alternative 2C 24.4 

3 Proposed – Total Length 56.5 

Proposed – Total Length 203.0 Proposed – Comparison portion for Alternatives 4A-4F 90.2 Alternative 4A 85.2 Alternative 4B 100.2 Alternative 4C 101.6 Alternative 4D 100.8 Alternative 4E 102.2 Alternative 4F 87.5 Proposed – Total Length 54.6 Proposed – Comparison portion for Alternatives 5A,B 25.3 Alternative 5A 33.7 Alternative 5B 44.4 Proposed – Comparison portion for Alternatives 5C 33.2 Alternative 5C 26.1 Proposed – Comparison portion for Alternatives 5D 19.4 Alternative 5D 17.5 Proposed – Comparison portion for Alternatives 5E 5.8 Alternative 5E 5.3 

6 Proposed – Total Length 0.5 

1E

24

1W

5

Table D.16-10 Page 1 of 2
Gateway West Transmission Line Draft EIS

Table D.16-10. Potable Water Wells within One-Half Mile of Transmission Lines cont.

Segment Number Proposed or Alternative Name Segment Length (Miles) Potable W

Proposed – Total Length 118.1 Proposed – Comparison portion for Alternatives 7A,B 35.2 Alternative 7A 38.0 Alternative 7B 46.4 Proposed – Comparison portion for Alternative 7C 20.1 Alternative 7C 20.3 Proposed – Comparison portion for Alternative 7D 6.2Alternative 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 3.1 Alternative 7G 3.2 Proposed – Comparison portion for Alternatives 7H,I 118.1 Alternative 7H 127.5 Alternative 7I 173.4 Proposed – Comparison portion 7/9 for Alternative 7J 1/ 143.9 

Alternative 7J1/ 202.1 Proposed – Total Length 131.0 1Proposed – Comparison portion for Alternative 8A 51.4 Alternative 8A 53.6 1Proposed – Comparison portion for Alternative 8B 45.3 Alternative 8B 45.8 1Proposed – 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 7.0Alternative 8E 18.5 Proposed – Total Length 161.7 Proposed – Comparison portion for Alternative 9A 7.8 Alternative 9A 7.7 Proposed – Comparison portion for Alternative 9B 49.5 Alternative 9B 53.2 Proposed – Comparison portion for Alternative 9C 14.7Alternative 9C 15.3 Proposed – Comparison portion for Alternatives 9D-9H 57.2 Alternative 9D 58.4 Alternative 9E 68.7 Alternative 9F 62.9 Alternative 9G 56.4 Alternative 9H 61.0 

10 Proposed – Total Length 33.6 

1/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for S

above compares 7J (202 miles) with the corresponding portion of Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alto Segment 7 of the Proposed Route (118.1 miles) only.

987

Source: IDWR

Table D.16-10 Page 2 of 2
Gateway West Transmission Line Draft EIS

Table D.16-11. Miles of the Eastern Snake River Plain Aquifer crossed by Proposed and Alternative Routes

Proposed – Total Length 100.6Proposed – Comparison portion for Alternative 1E-A 17.6Alternative 1E-A 16.1Proposed – Comparison portion for Alternative 1E-B 37.9Alternative 1E-B 59.3Proposed – Comparison portion for Alternative 1E-C 75.3Alternative 1E-C 48.71W(a) Proposed – Total Length 76.5Proposed – Comparison portion for Alternative 1W-A 20.3Alternative 1W-A 16.21W(c) Proposed – Total Length 70.6Proposed – Total Length 96.7Proposed – Comparison portion for Alternative 2A 28.8Alternative 2A 28.4Proposed – Comparison portion for Alternative 2B 7.0Alternative 2B 6.2Proposed – Comparison portion for Alternative 2C 28.4Alternative 2C 24.4

3 Proposed – Total Length 56.4

Proposed – Total Length 203.0Proposed – Comparison portion for Alternatives 4A-4F 90.2Alternative 4A 85.2Alternative 4B 100.2Alternative 4C 101.6Alternative 4D 100.8Alternative 4E 102.2Alternative 4F 87.5Proposed – Total Length 54.6 Proposed – Comparison portion for Alternatives 5A,B 27.1Alternative 5A 34.6Alternative 5B 45.3Proposed – Comparison portion for Alternatives 5C 33.2Alternative 5C 26.1Proposed – Comparison portion for Alternatives 5D 19.4 Alternative 5D 17.5 Proposed – Comparison portion for Alternatives 5E 5.8 Alternative 5E 5.3 

6 Proposed – Total Length 

Miles of 

Segment Number Proposed or Alternative Name Plain 

5

Segment Length (Miles)

1E

1W

24

Note: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactly

Table D.16-11 Page 1 of 2
Gateway West Transmission Line Draft EIS

Table D.16-11. Miles of the Eastern Snake River Plain Aquifer crossed by Proposed and Alternative Routes cont.

Proposed – Total Length 117.9 Proposed – Comparison portion for Alternatives 7A,B 38.8Alternative 7A 41.5Alternative 7B 50.1Proposed – 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 3.8 Alternative 7E 4.5 Proposed – Comparison portion for Alternative 7F 10.5 Alternative 7F 10.8Proposed – Comparison portion for Alternative 7G 3.1 Alternative 7G 3.2 Proposed – Comparison portion for Alternatives 7H,I 117.9 Alternative 7H 127.4 Alternative 7I 173.3 Proposed – Comparison portion 7/9 for Alternative 7J 1/ 143.9 Alternative 7J1/ 202.1 

Proposed – Total Length 131.0 Proposed – Comparison portion for Alternative 8A 51.4 Alternative 8A 53.6 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 18.5Proposed – Total Length 161.7 Proposed – Comparison portion for Alternative 9A 7.8 Alternative 9A 7.7 Proposed – Comparison portion for Alternative 9B 49.5Alternative 9B 53.2Proposed – Comparison portion for Alternative 9C 14.7Alternative 9C 15.3Proposed – Comparison portion for Alternatives 9D-9H 57.2Alternative 9D 58.2Alternative 9E 68.7Alternative 9F 62.9Alternative 9G 56.4Alternative 9H 61.0

10 Proposed – Total Length 33.6 

89

Note: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactly

1/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for S

compares 7J (202 miles) with the corresponding portion of Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternativthe Proposed Route (118.1 miles) only.

Segment Length (Miles)

Miles of 

Segment Number Proposed or Alternative Name Plain 

7

Table D.16-11 Page 2 of 2
Gateway West Transmission Line Draft EIS

Table D.16-12. Estimated Transmission Line Construction Water Requirements per Segment 

Total Water Requirement 

(gallons) 

Proposed – Total Length 100.6 2,158,320 Proposed – Comparison portion for Alternative 1E-A 17.6 377,875 Alternative 1E-A 16.1 345,539 Proposed – Comparison portion for Alternative 1E-B 37.9 812,518 Alternative 1E-B 59.3 1,273,250 Proposed – Comparison portion for Alternative 1E-C 75.4 1,617,996 Alternative 1E-C 48.7 1,045,598 1W(a) Proposed – Total Length 76.5 1,726,656 Proposed – Comparison portion for Alternative 1W-A 20.3 457,695 Alternative 1W-A 16.2 366,790 1W(c) Proposed – Total Length 70.6 1,561,498 Proposed – Total Length 96.7 2,728,139 Proposed – Comparison portion for Alternative 2A 28.8 811,682 Alternative 2A 28.4 801,593 Proposed – Comparison portion for Alternative 2B 7.0 197,439 Alternative 2B 6.2 174,677 Proposed – Comparison portion for Alternative 2C 28.4 800,334 Alternative 2C 24.4 687,800 

3 Proposed – Total Length 56.5 1,667,196 

Proposed – Total Length 203.0 5,884,609 Proposed – Comparison portion for Alternatives 4A-4F 90.2 2,614,894 Alternative 4A 85.2 2,469,044 Alternative 4B 100.2 2,904,793 Alternative 4C 101.6 2,946,363 Alternative 4D 100.8 2,922,302 Alternative 4E 102.2 2,963,872 Alternative 4F 87.5 2,537,848 Proposed – Total Length 54.6 1,614,478 Proposed – Comparison portion for Alternatives 5A,B 25.3 746,297 Alternative 5A 33.7 995,544 Alternative 5B 44.4 1,311,577 Proposed – Comparison portion for Alternatives 5C 33.2 980,308 Alternative 5C 26.1 771,147 Proposed – Comparison portion for Alternatives 5D 19.4 573,821 Alternative 5D 17.5 516,553 Proposed – Comparison portion for Alternatives 5E 5.8 170,411 Alternative 5E 5.3 156,261 

6 Proposed – Total Length 0.5 65,897 

Total Water 

Requirement

2.52.10.52.52.50.65.10.50.2

Proposed or Alternative Name

Segment Length 

(Miles) (acre-feet)

5.03.21.21.12.53.9

2

Segment Number

5.31.41.1 1W4.8

1E

6.68.4

4

18.1

8.07.68.99.09.09.17.8

5

5.02.33.14.03.02.41.81.60.5

Table D.16-12 Page 1 of 2
Gateway West Transmission Line Draft EIS

Table D.16-12. Estimated Transmission Line Construction Water Requirements per Segment cont.

Total Water Requirement 

(gallons) 

Proposed – Total Length 118.1 3,518,904 Proposed – Comparison portion for Alternatives 7A,B 35.2 1,048,407 Alternative 7A 38.0 1,131,303 Alternative 7B 46.4 1,384,524 Proposed – Comparison portion for Alternative 7C 20.1 599,120 Alternative 7C 20.3 603,716 Proposed – Comparison portion for Alternative 7D 6.2 185,184 Alternative 7D 6.8 202,109 Proposed – Comparison portion for Alternative 7E 3.8 113,941 Alternative 7E 4.5 133,454 Proposed – Comparison portion for Alternative 7F 10.5 312,960 Alternative 7F 10.8 321,064 Proposed – Comparison portion for Alternative 7G 3.1 93,792 Alternative 7G 3.2 96,291 Proposed – Comparison portion for Alternatives 7H,I 118.1 3,518,904 Alternative 7H 127.5 3,800,191 Alternative 7I 173.4 5,167,877 Proposed – Comparison portion 7/9 for Alternative 7J 1/ 143.9 4,289,202 

Alternative 7J1/ 202.1 6,023,959 

Proposed – Total Length 131.0 3,802,261 Proposed – Comparison portion for Alternative 8A 51.4 1,492,591 Alternative 8A 53.6 1,555,436 Proposed – Comparison portion for Alternative 8B 45.3 1,313,241 Alternative 8B 45.8 1,328,062 Proposed – Comparison portion for Alternative 8C 6.5 189,597 Alternative 8C 6.4 186,093 Proposed – Comparison portion for Alternative 8D 6.9 200,433 Alternative 8D 8.1 234,362 Proposed – Comparison portion for Alternative 8E 7.0 203,111 Alternative 8E 18.5 536,793 Proposed – Total Length 161.7 4,658,923 Proposed – Comparison portion for Alternative 9A 7.8 224,306 Alternative 9A 7.7 221,566 Proposed – Comparison portion for Alternative 9B 49.5 1,425,346 Alternative 9B 53.2 1,534,154 Proposed – Comparison portion for Alternative 9C 14.7 424,163 Alternative 9C 15.3 440,673 Proposed – Comparison portion for Alternatives 9D-9H 57.2 1,646,918 Alternative 9D 58.4 1,681,986 Alternative 9E 68.7 1,978,586 Alternative 9F 62.9 1,812,317 Alternative 9G 56.4 1,625,035 Alternative 9H 61.0 1,757,573 

10 Proposed – Total Length 33.6 1,021,405 

1/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for S

with the corresponding portion of Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segm

Segment Number Proposed or Alternative Name

Segment Length 

(Miles)

Total Water 

Requirement

(acre-feet) 

0.60.6

7

10.813.218.5

3.54.21.81.93.20.3

10.8

0.60.60.41.01.00.31.45.10.3

8

11.7

4.64.84.04.10.6

TOTAL WATER REQUIRED: Proposed Segments

5.65.05.43.1

30,408,286 gallons 

9

14.3

0.70.75.26.1

11.715.9

0.60.71.64.44.71.3

Table D.16-12 Page 2 of 2
Gateway West Transmission Line Draft EIS

Table D.16-13. TMDL and 303(d) listed Streams in the Analysis Area (Named Streams)

Segment Stream Name TMDL Sediment TMDL Temperature Segment 4 Sheep Creek xSegment 5, Comp 5AB East Fork Rock Creek xSegment 5, Comp 5AB, Comp 5C Bannock Creek xSegment 5, Segment 5D, Comp5AB, Comp5C East Fork Rock Creek xSegment 5A Bannock Creek xSegment 5A, Segment 5B, Segment 7, Comp7AB, Comp7HI East Fork Rock Creek x

Bannock Creek xBannock Creek xBannock Creek xSquaw Creek x

Segment 5D East Fork Rock Creek xSegment 7, Comp 7HI, Comp 7J South Fork Rock Creek xSegment 7A South Fork Rock Creek xSegment 7A, 7B Warm Springs Creek xSegment 7B South Fork Rock Creek Segment 7B, 7H, 7I Bannock Creek 

Goose Creek Shoshone Creek Horse Creek Cherry Creek Piney Creek Bannock Creek South Fork Rock Creek xGoose Creek xPiney Creek Horse Creek x

Segment 8 Cold Springs Creek Segment 8, Comp8B, Comp8D Sand Creek 

Sand Creek Sand Creek 

Segment 8D Sand Creek 

Browns Creek Sailor Creek 

Segment 9, Comp9B Deadman Creek 

Sinker Creek Birch Creek Jacks Creek 

Segment 9B Yahoo Creek Segment 9C Deadman Creek 

Jack Creek Rabbit Creek Castle Creek Birch Creek Browns Creek Pickett Creek Poison Creek Jacks Creek Jack Creek Rabbit Creek Jack Creek Rabbit Creek Jack Creek Rabbit Creek 

Segment 9FSegment 9GSegment 9HSegment 9ESegment 9DSegment 9, Comp9DESegment 9Segment 8, Segment 8D, Comp8B, Comp8DSegment 7ISegment 5CSegment 5BSegment 7J

Table D.16-13 Page 1 of 1
Gateway West Transmission Line Draft EIS

Table D.16-14. Acreage Comparison of Construction Related Stream Impacts

Intermittent Wet/Dry 

(within 500 feet)

Ephemeral 

(within 100 feet)

T

Disturbed Acres

% of Total 

Disturbance Area Disturbed Acres

% of Total 

Disturbance Area Dis

Proposed – Total Length 100.6 179 16.4 77 7.1 Proposed – Comparison portion for Alternative 1E-A 17.6 37 17.4 2 1.1 Alternative 1E-A 16.1 36 29.1 3 2.7 Proposed – Comparison portion for Alternative 1E-B 37.9 22 5.7 26 6.7 Alternative 1E-B 59.3 94 12.9 34 4.6 Proposed – Comparison portion for Alternative 1E-C 75.4 121 14.5 72 8.7 Alternative 1E-C 48.7 50 16.2 33 10.5 1W(a) Proposed – Total Length 76.5 83 13.3 39 6.3 Proposed – Comparison portion for Alternative 1W-A 20.3 22 10.3 3 1.4 Alternative 1W-A 16.2 40 29.3 4 2.8 1W(c) Proposed – Total Length 70.6 183 22.4 53 6.4 Proposed – Total Length 96.7 102 6.6 121 7.9 Proposed – Comparison portion for Alternative 2A 28.8 17 4.3 39 9.8 Alternative 2A 28.4 20 4.4 39 8.7 Proposed – Comparison portion for Alternative 2B 7.0 7 6.9 3 2.7 Alternative 2B 6.2 13 16.1 11 13.3 Proposed – Comparison portion for Alternative 2C 28.4 34 9.2 44 12.0 Alternative 2C 24.4 3 0.8 11 3.5 

3 Proposed – Total Length 56.5 111 12.9 67 7.7 

Proposed – Total Length 203.0 327 11.5 184 6.4 Proposed – Comparison portion for Alternatives 4A-4F 90.2 115 9.3 103 8.4 Alternative 4A 85.2 318 25.5 62 4.9 Alternative 4B 100.2 207 13.9 132 8.9 Alternative 4C 101.6 233 15.8 128 8.7 Alternative 4D 100.8 215 14.3 140 9.3 Alternative 4E 102.2 233 15.6 137 9.2 Alternative 4F 87.5 285 22.6 71 5.6 Proposed – Total Length 54.6 <1 118 12.0 Proposed – Comparison portion for Alternatives 5A,B 25.3 48 10.9 Alternative 5A 33.7 57 10.3 37 6.6 Alternative 5B 44.4 68 9.9 45 6.6 Proposed – Comparison portion for Alternatives 5C 33.2 <1 76 12.9 Alternative 5C 26.1 5 1.1 30 6.8 Proposed – Comparison portion for Alternatives 5D 19.4 <1 51 12.4 Alternative 5D 17.5 12 3.2 33 8.9 Proposed – Comparison portion for Alternatives 5E 5.8 8 5.6 Alternative 5E 5.3 6 5.5 

6 Proposed – Total Length 0.5 3 5.0 

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

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

1E

5

Segment Length 

(Miles)

1W

24

Proposed or Alternative Name

Segment 

Number

Table D.16-14 Page 1 of 2
Gateway West Transmission Line Draft EIS

Table D.16-14. Acreage Comparison of Construction Related Stream Impacts cont.

Intermittent Wet/Dry 

(within 500 feet)

Ephemeral 

(within 100 feet)

T

Disturbed Acres

% of Total 

Disturbance Area Disturbed Acres

% of Total 

Disturbance Area Dis

Proposed – Total Length 118.1 193 10.7 104 5.7 Proposed – Comparison portion for Alternatives 7A,B 35.2 44 8.8 Alternative 7A 38.0 64 10.3 53 8.6 Alternative 7B 46.4 69 9.3 60 8.0 Proposed – Comparison portion for Alternative 7C 20.1 12 4.1 6 2.1 Alternative 7C 20.3 11 3.7 22 7.7 Proposed – Comparison portion for Alternative 7D 6.2 5 4.7 6 5.1 Alternative 7D 6.8 5 4.1 7 5.3 Proposed – Comparison portion for Alternative 7E 3.8 23 35.1 Alternative 7E 4.5 24 30.2 Proposed – Comparison portion for Alternative 7F 10.5 75 37.5 2 1.1 Alternative 7F 10.8 51 30.0 10 5.7 Proposed – Comparison portion for Alternative 7G 3.1 6 12.1 Alternative 7G 3.2 3 4.3 Proposed – Comparison portion for Alternatives 7H,I 118.1 193 10.7 104 5.7 Alternative 7H 127.5 391 18.4 156 7.3 Alternative 7I 173.4 306 11.2 220 8.1 Proposed – Comparison portion 7/9 for Alternative 7J2/ 143.9 202 9.0 121 5.4 

Alternative 7J2/ 202.1 306 9.6 246 7.7 Proposed – Total Length 131.0 111 5.2 103 4.8 Proposed – Comparison portion for Alternative 8A 51.4 52 6.4 21 2.5 Alternative 8A 53.6 22 2.7 24 2.9 Proposed – Comparison portion for Alternative 8B 45.3 23 3.0 42 5.6 Alternative 8B 45.8 17 2.1 46 5.9 Proposed – Comparison portion for Alternative 8C 6.5 13 9.6 11 8.1 Alternative 8C 6.4 7 5.0 8 5.8 Proposed – Comparison portion for Alternative 8D 6.9 1 1.1 Alternative 8D 8.1 4 2.6 Proposed – Comparison portion for Alternative 8E 7.0 2 2.3 3 3.3 Alternative 8E 18.5 5 1.7 11 3.9 Proposed – Total Length 161.7 131 4.9 120 4.5 Proposed – Comparison portion for Alternative 9A 7.8 2 2.0 4 3.5 Alternative 9A 7.7 6 4.4 4 3.3 Proposed – Comparison portion for Alternative 9B 49.5 57 7.0 25 3.1 Alternative 9B 53.2 15 1.8 37 4.5 Proposed – Comparison portion for Alternative 9C 14.7 <1 0.1 15 6.3 Alternative 9C 15.3 1 0.5 13 4.5 Proposed – Comparison portion for Alternatives 9D-9H 57.2 26 2.8 59 6.2 Alternative 9D 58.4 2 0.2 26 3.1 Alternative 9E 68.7 23 2.3 58 5.8 Alternative 9F 62.9 7 0.7 46 4.7 Alternative 9G 56.4 7 0.8 21 2.5 Alternative 9H 61.0 7 0.7 41 4.2 

10 Proposed – Total Length 33.6 25 4.5 19 3.4 

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

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

Segment 

Number

78

2/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for Segment 9. 

corresponding portion of Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 7 of the Propo

Proposed or Alternative Name

Segment Length 

(Miles)

9

Table D.16-14 Page 2 of 2
Gateway West Transmission Line Draft EIS

Table D.16-15. Acreage Comparison of Operations Disturbance to Stream Buffers

Within 100 feet of 

Ephemeral Streams

Within 500 f

Disturbed Acres

% of Total 

Disturbance Area Disturbed Acres

% of Total 

Disturbance Area Disturbed A

Proposed – Total Length 100.6 49 17.4 25 9.0 

Proposed – Comparison portion for Alternative 1E-A 17.6 7 13.7 1 1.5 

Alternative 1E-A 16.1 10 24.7 1 2.9 

Proposed – Comparison portion for Alternative 1E-B 37.9 5 5.0 7 7.5 

Alternative 1E-B 59.3 17 10.1 8 5.2 

Proposed – Comparison portion for Alternative 1E-C 75.4 37 16.9 24 11.0 Alternative 1E-C 48.7 14 15.1 14 14.6 1W(a) Proposed – Total Length 76.5 34 18.5 11 6.0 Proposed – Comparison portion for Alternative 1W-A 20.3 7 13.9 1 1.6 

Alternative 1W-A 16.2 12 31.2 1 3.1 

1W(c) Proposed – Total Length 70.6 24 16.8 11 7.9 Proposed – Total Length 96.7 43 10.8 28 7.0 Proposed – Comparison portion for Alternative 2A 28.8 5 6.3 7 9.3 

Alternative 2A 28.4 6 6.6 8 8.4 Proposed – Comparison portion for Alternative 2B 7.0 2 10.4 1 3.2 Alternative 2B 6.2 1 8.3 2 9.8 Proposed – Comparison portion for Alternative 2C 28.4 7 9.5 8 10.2 

Alternative 2C 24.4 <1 0.5 2 3.7 

3 Proposed – Total Length 56.5 19 8.5 18 8.1 

Proposed – Total Length 203.0 68 10.4 40 6.2 10 Proposed – Comparison portion for Alternatives 4A-4F 90.2 25 9.4 21 8.1 1 Alternative 4A 85.2 60 21.6 14 5.2 1 Alternative 4B 100.2 54 15.4 33 9.4 1 Alternative 4C 101.6 54 15.7 30 8.9 1 Alternative 4D 100.8 54 15.1 35 9.9 1 Alternative 4E 102.2 53 15.5 32 9.1 1 Alternative 4F 87.5 57 20.4 15 5.4 1 Proposed – Total Length 54.6 t1/ 28 16.1 30 

Proposed – Comparison portion for Alternatives 5A,B 25.3 11 15.1 23 Alternative 5A 33.7 15 17.2 9 10.5 19 Alternative 5B 44.4 19 19.5 9 9.5 15 Proposed – Comparison portion for Alternatives 5C 33.2 t1/ 0.1 21 22.3 25 

Alternative 5C 26.1 1 1.6 7 12.5 9 

Proposed – Comparison portion for Alternatives 5D 19.4 t1/ 0.1 12 18.4 5 

Alternative 5D 17.5 4 6.7 6 11.3 4 

Proposed – Comparison portion for Alternatives 5E 5.8 1 2.6 Alternative 5E 5.3 1 3.7 

6 Proposed – Total Length 0.5 3 5.3 

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

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

1E

Segment Length 

(Miles)

1W

2

Within 500 feet of Perennial and 

Intermittent Streams

Proposed or Alternative Name

Segment 

Number

45

Table D.16-15 Page 1 of 2
Gateway West Transmission Line Draft EIS

Table D.16-15. Acreage Comparison of Operations Disturbance to Stream Buffers cont.

Within 100 feet of 

Ephemeral Streams

Within 500 f

Disturbed Acres

% of Total 

Disturbance Area Disturbed Acres

% of Total 

Disturbance Area Disturbed A

Proposed – Total Length 118.1 22 9.4 19 8.3 13 

Proposed – Comparison portion for Alternatives 7A,B 35.2 5 9.9 9 Alternative 7A 38.0 18 18.3 11 11.6 22 Alternative 7B 46.4 19 18.8 11 11.0 19 Proposed – Comparison portion for Alternative 7C 20.1 1 3.5 2 4.5 1 

Alternative 7C 20.3 1 2.1 2 7.3 t1/ 

Proposed – Comparison portion for Alternative 7D 6.2 1 8.9 2 14.2 Alternative 7D 6.8 1 7.7 2 12.9 Proposed – Comparison portion for Alternative 7E 3.8 2 35.7 0.0 Alternative 7E 4.5 3 37.7 0.0 Proposed – Comparison portion for Alternative 7F 10.5 11 39.7 1 1.9 Alternative 7F 10.8 8 32.9 1 4.8 Proposed – Comparison portion for Alternative 7G 3.1 <1 8.1 <1 Alternative 7G 3.2 <1 2.8 <1 Proposed – Comparison portion for Alternatives 7H,I 118.1 22 9.4 19 8.3 13 Alternative 7H 127.5 68 19.9 33 9.7 16 Alternative 7I 173.4 57 12.6 47 10.5 40 Proposed – Comparison portion 7/9 for Alternative 7J2/ 143.9 24 8.1 22 7.7 15 

Alternative 7J2/ 202.1 51 10.1 53 10.3 60 Proposed – Total Length 131.0 17 7.1 16 6.6 14 

Proposed – Comparison portion for Alternative 8A 51.4 8 8.3 3 3.1 2 

Alternative 8A 53.6 3 2.5 3 3.1 2 

Proposed – Comparison portion for Alternative 8B 45.3 3 3.7 8 8.9 12 

Alternative 8B 45.8 2 2.6 5 6.8 15 

Proposed – Comparison portion for Alternative 8C 6.5 2 11.7 1 8.0 1 Alternative 8C 6.4 2 13.0 1 7.2 2 Proposed – Comparison portion for Alternative 8D 6.9 <1 2.1 4 

Alternative 8D 8.1 1 5.1 3 Proposed – Comparison portion for Alternative 8E 7.0 <1 2.2 1 5.3 

Alternative 8E 18.5 1 2.7 1 3.3 

Proposed – Total Length 161.7 21 5.9 24 6.6 14 

Proposed – Comparison portion for Alternative 9A 7.8 1 3.4 1 6.0 1 Alternative 9A 7.7 1 7.4 1 7.0 1 Proposed – Comparison portion for Alternative 9B 49.5 10 7.9 3 2.9 8 

Alternative 9B 53.2 3 3.8 5 6.2 7 

Proposed – Comparison portion for Alternative 9C 14.7 2 5.8 t1/ 

Alternative 9C 15.3 <1 0.6 2 5.6 <1 

Proposed – Comparison portion for Alternatives 9D-9H 57.2 3 3.0 11 10.3 3 Alternative 9D 58.4 <1 0.4 4 4.6 3 Alternative 9E 68.7 4 3.1 11 8.5 14 Alternative 9F 62.9 <1 0.4 5 5.9 3 Alternative 9G 56.4 <1 0.4 4 4.5 4 Alternative 9H 61.0 <1 0.4 6 5.7 5 

10 Proposed – Total Length 33.6 1 1.4 2 2.4 2 

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

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

2/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for Segment 9. 

corresponding portion of Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 7 of the Propo

9

Proposed or Alternative Name 

Segment Length 

(Miles)

78

Within 500 feet of Perennial and 

Intermittent Streams

Segment 

Number

Table D.16-15 Page 2 of 2
Gateway West Transmission Line Draft EIS

Table D.16-16. Acreage Comparison of Two Single-Circuit Construction Disturbance to Stream Buffers

Within 100 feet of 

Ephemeral Streams

Within 500 

Disturbed Acres

% of Total 

Disturbance Area Disturbed Acres

% of Total 

Disturbance Area Disturbed A

Proposed – Total Length 96.7 110 5.6 129 6.5 Proposed – Comparison portion for Alternative 2A 28.8 19 3.6 43 8.2 Alternative 2A 28.4 25 4.4 41 7.2 Proposed – Comparison portion for Alternative 2B 7.0 8 5.7 3 2.2 Alternative 2B 6.2 18 15.7 12 10.3 Proposed – Comparison portion for Alternative 2C 28.4 38 7.9 44 9.0 Alternative 2C 24.4 3 0.7 13 3.2 

3 Proposed – Total Length 56.5 136 12.5 69 6.4 

Proposed – Total Length 203.0 391 10.5 208 5.6 60 Proposed – Comparison portion for Alternatives 4A-4F 90.2 141 8.8 117 7.3 5 Alternative 4A 85.2 356 21.8 64 3.9 5 Alternative 4B 100.2 232 12.0 138 7.1 9 Alternative 4C 101.6 259 13.4 133 6.9 9 Alternative 4D 100.8 241 12.4 146 7.5 9 Alternative 4E 102.2 258 13.3 143 7.4 9 Alternative 4F 87.5 319 19.4 75 4.6 5 

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

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

4

Proposed or Alternative Name

Segment Number 

Segment Length 

(Miles)

2

Within 500 feet of Perennial and 

Intermittent Streams

Table D.16-16 Page 1 of 1
Gateway West Transmission Line Draft EIS

Segment 

Number Proposed or Alternative Name Milepost Land Use/Feature Type Location

Segment 

Number Proposed or Alternative Name Milep

0.4 - 1 Oregon Trail Crossed 2.5 0.6 - 1.2 California Trail Crossed 5.3 - 6.5 1.8 - 2.7 Oregon Trail Crossed 5.7 - 16.0 2 - 2.6 Mormon Pioneer Trail Crossed 9.9 2 - 2.6 Pony Express Trail Crossed 30.9 2.1 Gravel Pit 532ft SE 40.1 2.2 Residence 876ft NW 44.9 2.6 Outbuilding 310ft N 45.2 2.9 Residence 862ft N 45.2 3 Residence 456ft N 48.3 3 Residence 765ft N 3.7 3 Residence 950ft N 3.7 3 Residence 492ft N 3.7 3.1 Residence 508ft N 3.8 5.3 Residence 645ft S 3.8 5.3 - 5.8 Town of Glenrock Crossed 7.5 - 8 6.2 Structure 638ft N 8.3 - 8.8 6.6 Structure 546ft N 8.5 - 9 20 Outbuilding 730ft W 8.7 21 Banner Mountain 713ft E 8.7 22.1 Hess Draw 87ft E 9 - 9.5 22.8 - 23.3 Active Mining Claims Crossed 9.1 26.9 Rainbow Canyon 356ft E 9.1 27.1 Moonshine Canyon 396ft W 9.1 - 9.7 29.9 - 35.8 Medicine Bow National Forest Crossed 22.5 30.6 - 33 Bates Hole MA Crossed 23 36.4 - 37.1 Medicine Bow National Forest Crossed 25.7 - 26.3 49.7 C P Ranch 771ft SW 31.8 56.9 North Fork Cottonwood Creek 334ft N 33 - 35.3 61.3 Residence 882ft E 33.4 - 43.9 63.6 Structure 438ft E 34 78.9 - 79.3 Wind Energy Crossed 48.2 - 50.7 83 Griffith Ranch 386ft E 49.2 - 56.2 0.4 - 1 Oregon Trail Crossed 65.4 0.5 - 1.1 California Trail Crossed 72.6-73.5 

1.8 - 2.7 Oregon Trail Crossed 73 2 - 2.5 Mormon Pioneer Trail Crossed 73.2 2 - 2.5 Pony Express Trail Crossed 76 2.1 Gravel Pit 155ft NW 0.7 - 1.2 2.5 Residence 401ft E 0.8 - 1.4 2.5 Residence 700ft E 1.8 2.6 Residence 887ft E 1.9 - 2.8 13.5 Structure 790ft NW 2.2 - 2.7 15.6 Residence 211ft N 2.2 - 2.7 3.6 Reed Pass 58ft S 2.3 19.9 Little Pinto Creek 565ft W 2.7 24.7 Wind Energy 323ft NW 12.2 33.4 Residence 826ft N 12.4 33.4 Structure 483ft N 13.7 44.3 Carlin Ranch 568ft N 0.1 - 1.2 44.3 Residence 407ft S 0.7 - 1.3 

1.2 1.3 1.5 

1E

Table D.17-1. Specific Land Uses Crossed or Within 1,000 Feet of the Proposed Action and Alternatives

1E Proposed – Total Length1E Alternative 1E-A

Alternative 1E-C

1W 1W(a) Proposed – Total Length1W

1E Alternative 1E-B

1W 1W(c) Proposed – Total Length

Alternative 1W-A

Table D.17-1 Page 1 of 12
Gateway West Transmission Line Draft EIS

Segment 

Number Proposed or Alternative Name Milepost Land Use/Feature Type Location

Segment 

Number Proposed or Alternative Name Milep

Table D.17-1. Specific Land Uses Crossed or Within 1,000 Feet of the Proposed Action and Alternatives

1.6 Residence 752ft N 21.3 1.7 Residence 676ft N 23 1.7 Residence 330ft N 23.3 - 23.5 1.7 Residence 72ft N 31 1.7 Residence 498ft N 41.1 1.7 Residence 638ft N 41.5 1.7 Residence 248ft N 41.9 - 42.1.8 Residence 363ft N 42.2 1.8 Residence 493ft N 42.8 1.8 Residence 86ft N 55.3 - 56.3 1.8 Residence 251ft S 57.3 - 58.3 1.8 Residence 526ft S 58.6 - 59.1.9 Residence 326ft N 58.7 1.9 Residence 330ft S 58.7 1.9 Residence 582ft S 58.7 1.9 Residence 736ft S 59 1.9 Residence 872ft S 59.1 2 Residence 427ft N 59.2 2.1 Residence 782ft NW 59.3 - 60.3 2.1 Residence 357ft SE 61.2 - 62.2 2.3 Residence 235ft SE 61.3 - 62.4 7.2 Structure 752ft S 61.4 - 62.4 10 Barn 495ft S 63 - 63.5 14.2 V R Ditch 546ft S 64.7 14.5 Kimball Ranch 996ft S 66 - 67 18.3 Banner Mountain 783ft W 67.5 - 73.9 19.3 Negro Creek Park 398ft W 68.1 - 69.20 - 20.5 Active Mining Claims Crossed 69.6 - 69.9 20.5 - 21 Medicine Bow National Forest Crossed 70.9 - 71.9 27.2 - 29.6 Medicine Bow National Forest Crossed 72.8 27.8 - 38.2 Bates Hole MA Crossed 74 - 75 41.8 Perey Reservoir 915ft E 77.5 - 78.42.5 - 45 Active Mining Claims Crossed 77.9 43.4 - 50.5 Wind Energy Crossed 79.1 - 80.44.4 Substation 35ft E 86 45.4 Structure 311ft W 0.1 64.9 Structure 542ft W 1 1.8 Wind Farm 859ft N 2.8 - 3.8 5.5 Coulter Mine 57ft S 4.8 - 5.8 5.9 Structure 127ft S 7.2 6.4 Hanna Draw 54ft N 21.5 8.2 - 9.2 Wind Energy Crossed 21.9 10.1 - 11.2 Active Coal Lease Crossed 0.9 10.2 - 11.2 Wind Energy Crossed 1.7 11.4 Barrel Spring 199ft E 1.8 11.9 Wind Energy 902ft E 1.9 13.3 Mine 635ft W 1.9 14.1 Antelope Dam 217ft E 1.9 14.1 Antelope Reservoir 217ft E 1.9 14.2 - 14.4 Wind Energy Crossed 1.9 15.2 - 16.2 Wind Energy Crossed 0.9 16.9 - 17.2 Wind Energy Crossed 2.5-6.7 17.7 - 17.9 Wind Energy Crossed 3.0 - 3.2 18.2 - 18.5 Wind Energy Crossed 3.7 - 4.5 21.1 Building/Industrial 144ft NW 4.5 - 4.8 21.2 Building/Industrial 70ft NW 9-9.3 21.2 Building/Industrial 211ft NW 10.3 - 10.6 21.2 Building/Industrial 93ft NW 10.3-13.2 

12.1 

2

Proposed – Total Length

1W

2

Alternative 2C

2 Proposed – Total Length cont.

Alternative 2AAlternative 2B

22

1W(c) Proposed – Total Length 

cont.

Table D.17-1 Page 2 of 12
Gateway West Transmission Line Draft EIS

Segment 

Number Proposed or Alternative Name Milepost Land Use/Feature Type Location

Segment 

Number Proposed or Alternative Name Milep

Table D.17-1. Specific Land Uses Crossed or Within 1,000 Feet of the Proposed Action and Alternatives

0.1 - 46.6 Point of Rocks MOA Crossed 157.7 3.9 - 9.7 Upper Muddy Creek Watershed Crossed 160.2 4.3 Jim Bridger Mine 791ft NE 162 5.8 Oil/Gas Well 45ft N 162.6 16.4 - 16.9 Wind Energy Crossed 163.2 19.7 - 20 Table Rock CDP Crossed 166.4 - 1732.7 Patrick Draw Oil Field 245ft S 172.5 40.9 - 41.4 Active Coal Lease Crossed 177 42.0 - 43.1 Active Coal Lease Crossed 177 44.1 Point of Rocks CDP 85ft W 179.2 44.4 Tenmile Draw 383ft E 179.4 - 180.1 - 12.2 Point of Rocks MOA Crossed 180.5 3.9 - 4.4 Active Coal Lease Crossed 182.5 29.6 - 30.9 North Rock Springs CDP Crossed 182.9 43.8 Wind Energy 558ft N 196.2 52.6 Seedskadee National Wildlife Refugee 777ft N 200.1 52.7 Building/Industrial 740ft N 201.4 57.5 - 58 California Trail Crossed 202 57.5 - 58 Oregon Trail Crossed 0.6 62.5 - 63 Pony Express Trail Crossed 0.5 75.1 Structure 405ft W 5.4 - 5.9 82.5 - 83 California Trail Crossed 5.4 - 5.9 82.7 - 82.8 Historic Trail Buffer - Medium Quality (500ft Buffer) Crossed 10.4 - 10.9 82.9 - 83.1 Historic Trail Buffer - Medium Quality (500ft Buffer) Crossed 28.6 94 - 97.1 Oregon Trail SRMA_Proposed Crossed 32.9 - 33.9 94.1 - 95.5 California Trail Crossed 35.8 - 40 94.7 Historic Trail Buffer - Medium Quality (500ft Buffer) 306ft N 44 94.8 - 95.8 Historic Trail - High Quality (.25mi Buffer) Crossed 48.6 107.1 North Fork Roney Creek 463ft S 50.3 - 50.8 107.1 Structure 343ft S 50.5 - 51.113.4 West Fork Beaver Creek 124ft N 53.4 123.4 - 124.4 Pine Creek SRMA Crossed 53.5 127.7 Residence 148ft N 53.7 129.1 Quealy Reservoir 711ft N 59.5 - 60.129.2 Raymond Mountain WSA 618ft N 60.4 - 60.6 130.7 - 131.3 California Trail Crossed 60.7 131.2 Birch Gulch 729ft N 60.7 131.2 Pivot 170ft S 60.7 131.2 Residence 752ft S 60.7 - 61.6 131.3 Residence 574ft N 60.7 - 61.9 131.4 Dixon Slough 429ft S 61.2 - 61.8 131.6 Garrett Creek 541ft N 61.4 - 61.9 139.4 Cook Canal 743ft NE 62.4 - 62.8 143.7 - 144.2 Oregon Trail Crossed 63.2 - 64 144.9 Sheep Creek Dam 877ft N 63.4 - 64 144.9 Sheep Creek Reservoir 877ft N 63.7 - 65.9 150.3 Banks Valley 948ft S 64 - 65 151.5 Shed 878ft N 66.1 - 67.6 152.4 Residence 823ft S 70.8 - 71.7 152.4 Residence 555ft S 71.3 152.5 Residence 435ft N 71.5 152.7 - 153.2 California Trail Crossed 72.1 - 72.152.7 - 153.2 Oregon Trail Crossed 72.2 152.9 Gravel Pit 998ft N 73.2 152.9 Residence 474ft N 73.3 153.2 Residence 253ft S 73.5 153.2 Structure 600ft S 82.3 155.5 Structure 103ft NE

4 Proposed – Total Length

Proposed – Total Length

44

Proposed – Total Length cont.

Alternative 4A

3

Table D.17-1 Page 3 of 12
Gateway West Transmission Line Draft EIS

Segment 

Number Proposed or Alternative Name Milepost Land Use/Feature Type Location

Segment 

Number Proposed or Alternative Name Milep

Table D.17-1. Specific Land Uses Crossed or Within 1,000 Feet of the Proposed Action and Alternatives

9.2 - 9.8 California Trail Crossed 64.9 9.2 - 9.8 Oregon Trail Crossed 65.2 - 67.2 9.6 - 9.6 Historic Trail Buffer - Low Quality (100ft Buffer) Crossed 67.5 12.1 Historic Trail Buffer - Low Quality (100ft Buffer) Crossed 69.7 12.1 - 12.6 Pony Express Trail Crossed 69.7 - 71.7 12.2 - 12.3 Historic Trail Buffer - Low Quality (100ft Buffer) Crossed 72.5 - 74.4 16 Oil/Gas Well 20ft S 74.7 - 75 37.5 Coyote Spring 498ft N 76.7 43.5 Glencoe Mine 698ft S 76.9 43.5 Structure 862ft S 77.1 - 83.3 47.9 Elkol Strip Mine 909ft N 77.3 47.9 - 48.7 Active Coal Lease Crossed 77.8 48.7 - 49.5 Wind Energy Crossed 78 52.3 C H Smith Dam 994ft W 78.2 52.3 C H Smith Reservoir 994ft W 78.3 53 Residence 953ft NE 79.5 54.3 SSP - Physaria condensata 757ft SW 80.6 - 81.6 60.3 Ollie Spring 832ft SE 80.7 - 80.8 62.5 - 63 Bear River SMA Crossed 80.8 63 - 63.7 Bear River SMA Crossed 81.2 63 - 64.6 Active Mining Claims Crossed 81.4 63.7 - 64.9 Bear River SMA Crossed 82 64.1 - 65 California Trail Crossed 82.4 64.9 SSP - Physaria dornii 993ft N 82.7 65.2 - 67.7 Bear River SMA Crossed 83 - 85.3 68.2 - 68.7 Bear River SMA Crossed 85 69.1 Bulldog Hollow 619ft S 9.2 - 9.8 70 - 70.1 Bear River SMA Crossed 9.2 - 9.8 72.2 - 76.8 Cokeville Meadows National Wildlife Refuge Crossed 9.6 - 9.6 73.1 Pivot 252ft E 12.1 - 12.74 Pivot 184ft E 12.1 - 12.6 74 - 74.8 California Trail Crossed 12.2 - 12.3 74.2 B-Q Dam 339ft W 16 74.2 - 74.3 Historic Trail Buffer - Low Quality (100ft Buffer) Crossed 37.5 84.4 Red Mountain 622ft E 43.5 9.2 - 9.8 California Trail Crossed 43.5 9.2 - 9.8 Oregon Trail Crossed 47.9 9.6 - 9.6 Historic Trail Buffer - Low Quality (100ft Buffer) Crossed 47.9 - 48.7 12.1 - 12.1 Historic Trail Buffer - Low Quality (100ft Buffer) Crossed 48.7 - 49.5 12.1 - 12.6 Pony Express Trail Crossed 52.3 12.2 - 12.3 Historic Trail Buffer - Low Quality (100ft Buffer) Crossed 52.3 16 Oil/Gas Well 20ft S 53 37.5 Coyote Spring 498ft N 54.3 - 55.3 43.5 Glencoe Mine 698ft S 56.3 43.5 Structure 862ft S 56.7 - 57.3 47.9 Elkol Strip Mine 909ft N 60 - 60.8 47.9 - 48.7 Active Coal Lease Crossed 63.1 - 63.6 48.7 - 49.5 Wind Energy Crossed 63.6 - 64.3 52.3 C H Smith Dam 994ft W 63.6 - 65.2 52.3 C H Smith Reservoir 994ft W 64.3 - 65.5 53 Residence 953ft NE 64.7 - 65.6 54.3 SSP - Physaria condensata 757ft SW 65.5 60.3 Ollie Spring 832ft SE 65.8 - 68.3 62.5 - 63 Bear River SMA Crossed 68.8 - 69.3 63 - 64.6 Active Mining Claims Crossed 69.7 63 - 63.7 Bear River SMA Crossed 70.6 - 70.7 63.7 - 64.9 Bear River SMA Crossed 72.8 - 77.5 64.1 - 65 California Trail Crossed 73.7 

4 Alternative 4C4

4

Alternative 4B

4

Alternative 4CAlternative 4D

Table D.17-1 Page 4 of 12
Gateway West Transmission Line Draft EIS

Segment 

Number Proposed or Alternative Name Milepost Land Use/Feature Type Location

Segment 

Number Proposed or Alternative Name Milep

Table D.17-1. Specific Land Uses Crossed or Within 1,000 Feet of the Proposed Action and Alternatives

74.6 Pivot 184ft E 0.5 74.6 - 75.4 California Trail Crossed 0.6 74.8 B-Q Dam 339ft W 5.4 - 5.9 74.8 - 74.9 Historic Trail Buffer - Low Quality (100ft Buffer) Crossed 5.4 - 5.9 85 Red Mountain 622ft E 10.4 - 10.9 9.2 - 9.8 California Trail Crossed 28.6 9.2 - 9.8 Oregon Trail Crossed 32.9 - 33.9 9.6 - 9.6 Historic Trail Buffer - Low Quality (100ft Buffer) Crossed 35.8 - 40 12.1 - 12.1 Historic Trail Buffer - Low Quality (100ft Buffer) Crossed 44 12.1 - 12.6 Pony Express Trail Crossed 48.6 12.2 - 12.3 Historic Trail Buffer - Low Quality (100ft Buffer) Crossed 50.3 - 50.8 16 Oil/Gas Well 20ft S 50.5 - 51.37.5 Coyote Spring 498ft N 54.7 43.5 Glencoe Mine 698ft S 60.4 - 62.7 43.5 Structure 862ft S 61.2 - 61.8 47.9 Elkol Strip Mine 909ft N 61.3 - 61.8 47.9 - 48.7 Active Coal Lease Crossed 62.8 48.7 - 49.5 Wind Energy Crossed 63.4 - 63.4 52.3 C H Smith Dam 994ft W 64 - 66.5 52.3 C H Smith Reservoir 994ft W 65.5 53 Residence 953ft NE 65.9 - 68.3 54.3 - 55.3 Wind Energy Crossed 67.1 - 68.8 56.3 Mine 220ft SE 67.9 56.7 - 57.3 Wind Energy Crossed 68.8 60 - 60.8 Wind Energy Crossed 70.7 63.1 - 63.6 Bear River SMA Crossed 71.6 63.6 - 65.2 Active Mining Claims Crossed 71.6 63.6 - 64.3 Bear River SMA Crossed 71.8 64.3 - 65.5 Bear River SMA Crossed 72.2 64.7 - 65.6 California Trail Crossed 72.4 65.5 SSP - Physaria dornii 993ft N 72.9 65.8 - 67.8 Bear River SMA Crossed 73 68.1 Bear River SMA 129ft N 74.6 70.3 Tower 504ft S 76 - 76.6 70.3 - 72.3 Rock Creek/Tunp Draft Preferred Alt Crossed 76.4 73.1 - 75 Rock Creek/Tunp Draft Preferred Alt Crossed 76.4 75.3 - 75.6 Rock Creek/Tunp Draft Preferred Alt Crossed 76.4 77.3 Shed 189ft W 76.6 77.5 Barn 832ft W 76.7 77.7 - 83.9 California Trail Crossed 76.9 77.9 Substation 745ft W 84.7 78.4 Barn 462ft W 3.1 78.6 Shed 812ft W 3.5 78.8 Leeds Creek 501ft W 3.5 78.9 Gravel Pit 259ft W 3.6 80.1 Barn 9ft E 5.2 81.2 - 82.2 Historic Trail - High Quality (.25mi Buffer) Crossed 5.4 81.3 - 81.4 Rock Creek/Tunp Draft Preferred Alt Crossed 8.8 81.4 Covey Canal 296ft W 9.4 81.8 Residence 326ft W 11.0 82 Horse Creek 30ft E 12 - 12.5 82.6 SSP - Lepidium integrifolium var. integrifolium 819ft NW 12.8 83 Commercial Building 45ft W 16.0 83.4 Commercial Building 667ft W 24.1 83.6 - 85.9 Cokeville Meadows National Wildlife Refuge Crossed 24.2 85.6 Windmill Draw 508ft SW 33.2 

34.9 

4

54

4

Alternative 4F

Alternative 4D cont.

Proposed – Total Length

Alternative 4E

Table D.17-1 Page 5 of 12
Gateway West Transmission Line Draft EIS

Segment 

Number Proposed or Alternative Name Milepost Land Use/Feature Type Location

Segment 

Number Proposed or Alternative Name Milep

Table D.17-1. Specific Land Uses Crossed or Within 1,000 Feet of the Proposed Action and Alternatives

34.9 Hutchinson Canyon 98ft N 15 36.9 Green Canyon 70ft E 15 51.3 Residence 575ft S 15.3 51.4 Commercial Building 958ft N 15.5 51.7 Residence 480ft NW 15.5 - 16.51.7 Residence 616ft N 15.6 51.9 Barn 381ft NW 15.6 51.9 Barn 415ft NW 15.6 51.9 Barn 389ft NW 15.7 52 Residence 857ft NW 15.7 52 Residence 923ft NW 15.7 52 Residence 421ft NW 15.7 52.1 Residence 787ft NW 15.8 52.1 Residence 984ft NW 15.8 52.3 Residence 864ft N 16.3 52.4 Residence 842ft N 16.4 52.4 Residence 900ft N 17.4 52.5 Pipeline Recreation Site 392ft NE 2.0 52.6 Pipeline 748ft NE 2.0 52.6 - 53.1 Oregon Trail Crossed 2.6 54 Marys Mine Access Area 43ft N 2.8 - 3.1 54.6 Substation 484ft S 2.9 3.5-4.4 California Trail Crossed 3.4 14 Residence 522ft N 0.5 16.7 Arbon Cemetery 594ft N 2.9 23.6 Deep Creek Mountains 471ft S 4.9 31.9 Residence 141ft E 5 34.4 Mill Canyon 805ft W 8 - 8.6 34.4 Residence 659ft W 8.6-11.6 3.5-4.4 California Trail Crossed 9.3-10 23.4 Residence 675ft S 10.4 38.5 Residence 175ft E 11.3 38.8 Portage Canyon 485ft W 11.3 39.5 Pivot 745ft W 11.3 42.6 Residence 141ft E 12.9 - 13.4 45.1 Mill Canyon 805ft W 14.3 45.1 Residence 659ft W 19.3 

5 Alternative 5C 17.1 Sawmill Creek 685ft SW 24.5 

0.3 Mill Canyon 320ft S 59.2 - 59.8 0.3 Residence 277ft S 59.5 10.5 Cold Creek Canyon 861ft NE 59.6 13.3 Residence 736ft E 72.5 - 73.3 13.3 Residence 699ft E 72.5 - 73.3 13.4 Residence 668ft NE 74.2 - 74.7 13.5 Residence 513ft NE 75.3 13.6 Residence 919ft NE 75.4 13.9 Cold Creek Crossed 82.5 14 Residence 222ft E 82.6 14.5 Residence 395ft W 82.7 15 Residence 738ft S 82.8 

5

5

Proposed – Total Length cont. 

Alternative 5AAlternative 5B

5

Proposed – Total Length

Alternative 5D cont.

Alternative 5E

555 Alternative 5D

7

Table D.17-1 Page 6 of 12
Gateway West Transmission Line Draft EIS

Segment 

Number Proposed or Alternative Name Milepost Land Use/Feature Type Location

Segment 

Number Proposed or Alternative Name Milep

Table D.17-1. Specific Land Uses Crossed or Within 1,000 Feet of the Proposed Action and Alternatives

83.6 Residence 165ft NW 11.3 83.6 Residence 366ft SE 11.3 83.6 Residence 798ft SE 11.7-12.8 87.2 Searle Airstrip Crossed 13.2-13.8 92.5 Residence 951ft S 40.2-41.1 94.4 Residence 960ft SW 42-44 94.5 Residence 477ft SW 47.9 - 48.4 97.1 Residence 247ft NE 48.8 98 Residence 555ft S 57.7 100.1 Residence 213ft NW 57.7 100.1 Residence 295ft NW 58.3 - 66.4 100.2 Residence 236ft NE 69 102.8 - 103.2 CAFO Crossed 71.3 104.3 Butte Wildlife Habitat Area South 353ft S 72 - 75.9 114.3 Tugaw Airstrip (planned) Crossed 72.2 114.1 Bower Cemetery 759ft N 78.9 114.2 Cold Spring Creek 691ft S 78.9 114.5 Residence 901ft N 80.4 - 81.4.1-5.2 Caribou National Forest Crossed 80.7 5.6-6.2 California Trail Crossed 81.6 27.4 Residence 775ft SW 81.9 29.3 Residence 619ft S 83.4 29.4 Residence 885ft N 84.8 4.1-5.2 Caribou National Forest Crossed 87.3 5.6-6.2 California Trail Crossed 87.4 23.9 Bull Canyon 751ft S 89.9 23.4 Residence 858ft N 90.5 - 90.7 24.4 Residence 607ft S 91.5 25 South Fork Bull Canyon 96ft N 93.1 32.3 Stewart Canyon 228ft E 101.2 34.6 Goddard Canyon 51ft E 115.8 8.1 Pivot 187ft S 116.4 9.2 CAFO 767ft N 123.5 9.2 - 10.3 California Trail Crossed 123.6 9.6 Residence 448ft NE 124 9.6 Residence 642ft NE 0.5 15.9 - 16.9 Oregon Trail Crossed 2.9 1.2 - 2.7 Oregon Trail Crossed 4.9 1.8 - 2.1 Wind Energy Crossed 5 4.1 Pivot 344ft E 8-8.6 1.6 Water Canyon Spring 885ft SE 8.6-11.6 3.9 Residence 266ft SW 9.3-10 4.0 Residence 235ft NW 10.3 4.0 Residence 467ft SE 11.3 4.0 Residence 776ft NW 11.3 

7 Alternative 7F 3.2 Water Canyon Spring 885ft SE 11.7-12.8 

0.2 Tugaw Airstrip - planned Crossed 13.2-13.8 0.1 Bower Cemetery 980ft NE 40.2-41.1 0.1 Cold Spring Creek 691ft S 42-44 0.3 Residence 274ft N 47.9 - 48.4 0.5 Residence 406ft NE 48.8 2.9 Residence 769ft NE 57.7 4.9 Potter Creek 834ft NE 57.7 5 Residence 370ft NE 58.3 - 72.8-8.6 Caribou National Forest Crossed 67.2 8.6-11.6 Caribou National Forest 125ft S 75.3 - 75.5 9.3-10 Elkhorn Mountain Roadless Area 125ft S 82.4 - 83 10.3 South Fork Hawkins Creek 615ft N 85.9 - 97.2 

777

Proposed – Total Length cont. 

Alternative 7C

Alternative 7G

Alternative 7E

Alternative 7H cont.

Alternative 7I

7

Alternative 7DAlternative 7H

77

77

Alternative 7B

7

Alternative 7A

7

Table D.17-1 Page 7 of 12
Gateway West Transmission Line Draft EIS

Segment 

Number Proposed or Alternative Name Milepost Land Use/Feature Type Location

Segment 

Number Proposed or Alternative Name Milep

Table D.17-1. Specific Land Uses Crossed or Within 1,000 Feet of the Proposed Action and Alternatives

100.3 Sparks Spring 520ft N 2.6 103.2 - 103.9 California Trail Crossed 3.9 111.3 - 112.2 California Trail Crossed 4.3 112.3 California Trail 924ft NW 11.5 114.7 - 115.2 California Trail Crossed 2.2 114.9 Pole Creek 177ft N 3.3 120 Sawtooth National Forest 906ft N 3.7 120.8 Mahogany Butte 316ft N 14.8 133.1 Willow Spring Creek 382ft SW 14.9 133.7 Middle Fork Hannahs Fork 575ft SW 16.2 133.7 North Fork Hannahs Fork 799ft SW 16.8 133.7 South Hannahs Fork 799ft SW 16.9 137.9 Sheep Spring Creek 44ft W 17 143.4 Southeast Spring 779ft W 17.2 149.1 Soldier Spring 558ft E 17.3 152.3 Williams Spring 951ft NE 17.4 154.6 Water Tank 85ft SW 17.5 154.8 Gravel Pit 823ft NE 19.3 161.8 Structure 11ft N 19.9 162.1 Dry Cottonwood Creek 838ft N 21.9 162.1 North Cottonwood Creek 838ft N 22.1 169 Residence 151ft N 22.4 169.4 Residence 355ft S 26.6 170.7 Pivot 121ft S 28.3 0.5 Residence 406ft NE 28.7 2.9 Residence 769ft NE 38.3 4.9 Potter Creek 834ft NE 38.4 5 Residence 370ft NE 39.3 8-8.6 Caribou National Forest Crossed 42.3 8.6-11.6 Caribou National Forest 125ft S 43.9 9.3-10 Elkhorn Mountain Roadless Area 125ft S 44.8 - 56.7 10.3 South Fork Hawkins Creek 615ft N 45.5 11.3 Hawkins Dam 1000ft N 46.2 - 46.8 11.3 Hawkins Reservoir 900ft N 46.3 - 46.9 11.7-12.8 Caribou National Forest Crossed 49.6 - 50 13.2-13.8 California Trail Crossed 52.2 40.2-41.1 Curlew National Grasslands 125ft S 55.1 - 55.8 42-44 Curlew National Grasslands 125ft S 55.3 - 55.8 47.9-48.4 California Trail Crossed 65.2 - 67.2 48.8 Eyrie Peak 896ft SE 70.4 57.7 Silo 752ft N 83.3 - 83.6 57.7 Warehouse 555ft N 85.4 - 89.3 58.3-72.1 Raft River-Curlew Valley IBA Crossed 93.5 - 98.3 67.2 Monument Canyon 28ft W 98.3 - 12675.3-75.5 Raft River-Curlew Valley IBA Crossed 98.5-107.7 82.4-83 California Trail Crossed 116.5 - 1185.9-97.2 Raft River-Curlew Valley IBA Crossed 117.4 - 11100.3 Sparks Spring 520ft N 117.5-117103.2-103.9 California Trail Crossed 118 - 123111.3-112.2 California Trail Crossed 118.1-118112.3 California Trail 924ft NW 120.1 114.7-115.2 California Trail Crossed 121.3 - 12114.9 Pole Creek 177ft N 121.4 - 12120 Sawtooth National Forest 906ft N 123.3 - 12120.8 Mahogany Butte 316ft N 123.4 - 13133.1 Willow Spring Creek 382ft SW 123.5 133.7 Middle Fork Hannahs Fork 575ft SW 123.6 133.7 North Fork Hannahs Fork 799ft SW 123.6 133.7 South Hannahs Fork 799ft SW 123.7 137.2 Structure 123ft NW 128.9 

8

Alternative 7J -B

Proposed – Total Length

7

77 Alternative 7I cont.

Alternative 7J -A

Table D.17-1 Page 8 of 12
Gateway West Transmission Line Draft EIS

Segment 

Number Proposed or Alternative Name Milepost Land Use/Feature Type Location

Segment 

Number Proposed or Alternative Name Milep

Table D.17-1. Specific Land Uses Crossed or Within 1,000 Feet of the Proposed Action and Alternatives

128.9 Structure 914ft NE 25.6 - 46.5 128.9 Structure 395ft NE 27.2 128.9 Structure 736ft NE 31.2 129 Structure 987ft NE 33.1 - 33.8 129.5 - 129.6 LF167310-Wilson Creek Sanitary LF Crossed 33.6 - 33.9 130.4 Residence 768ft W 37 - 37.8 130.4 Residence 629ft SW 37.3 - 38.130.5 Residence 945ft E 43.6 130.5 Residence 929ft E 44.9 - 45.3 130.5 Residence 297ft E 45.9 130.6 Residence 478ft E 46 130.6 Residence 766ft E 46.1 130.7 Residence 616ft SW 46.2 1.5 Pivot 205ft N 46.2 4.3 Residence 336ft N 46.2 4.6 CAFO 166ft S 46.3 4.6 Residence 575ft S 46.3 4.7 Animal Pen 154ft N 46.4 19.5 Residence 903ft S 46.4 20 Residence 367ft S 46.4 21.2 Pivot 141ft S 46.5 - 46.8 23.3 Billingsley Creek Wildlife Management Area 343ft S 46.6 23.3 Residence 257ft N 46.8 - 53.6 23.5 Justice Grade 769ft N 47 23.6 Residence 419ft NW 47 - 47.3 23.6 Residence 315ft NW 50.7 - 50.9 23.6 Residence 571ft NW 52 - 52.3 23.6 Residence 217ft N 0.1 - 3.5 23.7 Residence 469ft NW 8.1 23.7 Residence 46ft S 10.1 - 11.4 23.7 Residence 757ft S 13.1 - 13.6 23.7 Residence 360ft N 19.1 23.7 Residence 465ft N 19.3 23.8 Residence 928ft S 19.3 23.8 Residence 380ft NW 19.3 23.8 Residence 632ft N 19.3 23.8 Residence 669ft NW 19.4 23.9 Residence 984ft N 19.4 23.9 Residence 800ft S 19.4 23.9 Residence 695ft S 19.4 23.9 Residence 476ft S 19.4 23.9 Residence 454ft S 19.4 23.9 Residence 624ft S 20.3 23.9 Residence 712ft S 20.6 23.9 Residence 993ft S 20.8 23.9 Residence 831ft S 20.8 24 Residence 691ft S 21.4 24.0 Residence 315ft SE 21.7 24.0 Residence 340ft SE 23.9 24.0 Residence 916ft S 24 24.0 Residence 924ft S 24.5 24.1 Structure 409ft S 26.5 24.2 Residence 263ft S 27 - 27.5 24.2 Residence 342ft N 28.1 - 28.8 24.2 Residence 403ft N 28.8 - 31.6 24.3 Fish Farm 798ft N 29.4 24.5 Snake River 210ft N 30.2 24.5 - 25.6 MUA-8 Hagerman Fossil Beds Crossed 33.3 

8

8

Alternative 8A

Alternative 8A cont.

Alternative 8B

Proposed – Total Length cont.

8

8

Table D.17-1 Page 9 of 12
Gateway West Transmission Line Draft EIS

Segment 

Number Proposed or Alternative Name Milepost Land Use/Feature Type Location

Segment 

Number Proposed or Alternative Name Milep

Table D.17-1. Specific Land Uses Crossed or Within 1,000 Feet of the Proposed Action and Alternatives

33.3 Residence 398ft E 0.1 - 2 33.9 Blue Sage Estates 3ft W 4.9 - 5.6 33.9 Residence 163ft NW 4.9 - 5.2 33.9 Residence 722ft W 5.1 33.9 - 34 Colombani Estates Crossed 0.1- 0.4 33.9 - 34.2 Sagebrush Ridge Estates Crossed 0.1 - 8 34 Residence 730ft W 1.5 34.1 Residence 574ft W 4.4 34.3 Residence 70ft W 5.9 34.3 Residence 421ft W 0-18.4 34.8 Silo 59ft W 8.7-10.2 35 Gravel Pit 195ft E 9.4-10.8 37 Residence 278ft N 1 37.1 Animal Pen 37ft S 2.2 37.2 Residence 202ft N 3.9 37.2 Residence 9ft S 4.7 37.3 Residence 301ft S 6.4 37.4 Residence 140ft N 6.5 37.4 Residence 83ft S 8.9 37.7 Residence 338ft N 12.1 - 12.8 37.8 Warehouse 111ft S 12.7 37.9 Residence 176ft N 18.1 - 19.37.9 Residence 134ft N 30.2 38.5 Residence 129ft S 32.4 - 32.7 39 Residence 20ft S 32.5 - 33 39.4 Residence 179ft N 32.6 - 35.5 39.7 Residence 173ft N 35.5 - 37.5 40.4 Residence 170ft SE 37.5 - 46.6 42.1 Residence 608ft SE 46.6 - 80.6 42.2 Residence 463ft SE 56.9 42.6 Deer Flat National Wildlife Refuge 683ft S 59.8 - 72.8 42.8 Snake 445ft SE 76.5 43.5 - 44.1 Oregon Trail Crossed 78.1 43.8 CAFO 924ft W 80.6 - 87.7 43.8 Outbuilding 24ft E 87.6 - 96.4 43.8 Outbuilding 516ft E 96.6 - 98.7 43.9 CAFO 671ft E 97.4 43.9 Outbuilding 77ft E 98.8 43.9 Outbuilding 36ft W 98.9 43.9 Outbuilding 94ft E 98.9 43.9 Outbuilding 181ft E 99 43.9 Residence 38ft W 99.1 43.9 Residence 20ft E 100.5 43.9 Residence 199ft W 109.4 44 Residence 729ft E 110 44.2 Residence 248ft SE 115.7 44.3 Residence 88ft N 118.7 44.6 Residence 71ft N 118.8 44.9 Bernard Ditch 788ft S 119.3 45.1 Residence 937ft S 131.4 45.3 Residence 98ft N 132 45.3 Residence 560ft S 132.8 45.3 Residence 490ft N 134.2 45.3 Residence 923ft N 134.4 45.5 Residence 575ft N 142 - 14545.5 Residence 758ft N 142 - 145

150.9 - 15

9

8 Alternative 8B cont.

Proposed – Total Length

88

Alternative 8CAlternative 8D

Alternative 8E

8

Table D.17-1 Page 10 of 12
Gateway West Transmission Line Draft EIS

Segment 

Number Proposed or Alternative Name Milepost Land Use/Feature Type Location

Segment 

Number Proposed or Alternative Name Milep

Table D.17-1. Specific Land Uses Crossed or Within 1,000 Feet of the Proposed Action and Alternatives

150.9 - 152.1 Morley Nelson Snake River Birds of Prey NCA Crossed 15.9 - 16.6 151.1 - 160.6 Black Mountain HMA Crossed 16 158.5 Reynolds 2 66ft SW 17.1 - 58.160.5 Claypit 110ft E 16.3 160.7 Residence 593ft E 16.9 160.8 Residence 584ft E 18.1 161 Residence 776ft E 34.8-39.4 161 Residence 805ft E 44.4-46.6 161.1 Residence 600ft E 45.2-46.8 161.2 Residence 775ft E 46.5-48 161.3 Residence 134ft SE 46.7-56.9 161.4 Residence 789ft SE 47.6 1.6 Residence 361ft N 55.2-55.8 6.1 Gravel Pit 358ft S 55.3-55.5 0.6 - .7 Active Mining Claims Crossed 56.9-58.1 1.3 Residence 9ft SW 56.9-58.2 6.2 Residence 894ft E 0.1 - 2.5 7.3 Residence 696ft E 2.4 - 6.2 8.7 CAFO 365ft E 5.6 9.1 Residence 561ft W 5.9 9.3 Residence 515ft W 5.9 - 9.6 9.8 - 23.8 MUA-7 Saylor Creek East Crossed 27.2 - 27.3 12.1 Pivot 292ft E 28.1 - 29.12.4 Pivot 119ft W 40.6 - 42.5 13 Pivot 280ft W 43 - 43.3 14.1 Pivot 395ft W 43.7 - 44.17.4 Magic Water Canal 913ft E 51.2 - 52.3 23.8 - 26.3 MUA-9 Hagerman ORV (Owsley Bridge) Crossed 64.1 - 65.6 25.6 Wind Energy 337ft SW 66.3 26.3 - 52.3 MUA-7 Saylor Creek East Crossed 66.4 - 66.6 26.5 - 27.2 Wind Energy Crossed 66.5 28.4 Animal Pen 457ft NE 66.7 - 66.8 38.3 - 44.4 Saylor Creek HMA Crossed 66.8 41.1 Gravel Pit 525ft S 67.6 - 68.7 46.1 Residence 613ft S 68.4 - 68.5 46.7 Pivot 133ft N 68.4 - 68.5 47.9 Warehouse 970ft SW 0-1.4 48 Pivot 60ft SW 1.5-3.6 48.4 Residence 906ft NE 2.3 49.1 Grindstone Ag Airport 398ft SW 3.7 52.3 - 53.2 MUA-6 Saylor Creek West Crossed 3.8 0.6 - .7 Active Mining Claims Crossed 3.8 1.3 Residence 9ft SW 4 6.2 Residence 894ft E 4.1 7.3 Residence 696ft E 5.5 8.7 CAFO 377ft E 14.4 9.1 Residence 300ft E 14.9 9.2 Residence 762ft E 19.7 9.6 - 15.2 MUA-7 Saylor Creek East Crossed 20.5 0.1 - 6.8 Morley Nelson Snake River Birds of Prey NCA Crossed 20.6 7 - 9.4 MUA-6 Saylor Creek West Crossed 20.6 8.3 - 9.9 Oregon Trail Crossed 21.6-62.8 9.4 - 15.8 C.J. Strike SRMA Crossed 22.6 9.4 - 15.8 Morley Nelson Snake River Birds of Prey NCA Crossed 39.3-43.9 9.9 - 12.1 C.J. Strike Reservoir SRMA Crossed 50.2-51.4 12.2 - 12.8 C.J. Strike Reservoir SRMA Crossed 45.2-46.8 12.3-14.1 Cove Non-motorized Area (BLM) Crossed 50.7-61.6 13.8 - 14.4 Oregon Trail Crossed 60-60.2 14.1 - 14.3 Oregon Trail SRMA Crossed 61.6-62.8 14.6 - 15.8 C.J. Strike Reservoir SRMA Crossed 61.6-62.9 

999

999

99

Proposed – Total Length cont.

Alternative 9A

Alternative 9F

Alternative 9D

Alternative 9B

Alternative 9C

Alternative 9D cont.

Alternative 9E

Table D.17-1 Page 11 of 12
Gateway West Transmission Line Draft EIS

Segment 

Number Proposed or Alternative Name Milepost Land Use/Feature Type Location

Segment 

Number Proposed or Alternative Name Milep

Table D.17-1. Specific Land Uses Crossed or Within 1,000 Feet of the Proposed Action and Alternatives

0.1-6.8 Morley Nelson Snake River Birds of Prey NCA Crossed 0.2 7-9.4 MUA-6 Saylor Creek West Crossed 0.2 8.3-9.9 Oregon Trail Crossed 6.2 9.4-15.8 C.J. Strike SRMA Crossed 13.7 9.4-15.8 Morley Nelson Snake River Birds of Prey NCA Crossed 13.8 9.9-12.1 C.J. Strike Reservoir SRMA Crossed 13.8 12.2-12.8 C.J. Strike Reservoir SRMA Crossed 13.9 12.3-14.1 Cove Non-motorized Area (BLM) Crossed 15.3 13.8-14.4 Oregon Trail Crossed 15.5 14.1-14.3 Oregon Trail SRMA Crossed 15.5 14.6-15.8 C.J. Strike Reservoir SRMA Crossed 18.8 15.9-16.6 Oregon Trail Crossed 19.2 16 Structure 954ft NE 19.2 17.1-49.5 Morley Nelson Snake River Birds of Prey NCA Crossed 19.6 16.3 Locust Park 902ft NE 20.1 16.9 C.J. Strike Reservoir SRMA 211ft E 20.5 18.1 Structure 272ft E 22.4 34.8-39.4 Idaho National Guard Orchard Training Area Crossed 25.2 43.4-44.3 Guffey Butte/Black Butte Archaeological Area Crossed 25.3 44.3-49.5 Birds of Prey Avoidance Area Crossed 30.1 - 30.6 49.9-56.3 Morley Nelson Snake River Birds of Prey NCA Crossed 30.4 49.9-56.3 Birds of Prey Avoidance Area Crossed 32.1 54.2-54.4 Oregon Trail SRMA Crossed 33.2 55.2-56.3 Owyhee Front SRMA Crossed 33.3 55.3-56.4 Black Mountain HMA Crossed 33.3 0-1.4 Morley Nelson Snake River Birds of Prey NCA Crossed1.5-3.6 MUA-6 Saylor Creek West Crossed2.3 Residence 276ft NW3.7 Beeroth Canal 233ft S3.8 Bieroth Canal 625ft N3.8 Residence 720ft N4 Cemetery 344ft S4.1 O X Cemetery 369ft S5.5 Pivot 591ft NE14.4 Residence 92ft N14.9 Residence 308ft N19.7 Structure 380ft SE20.5 Residence 867ft NE20.6 Structure 882ft S20.6 Residence 907ft SE21.6-54 Morley Nelson Snake River Birds of Prey NCA Crossed22.6 Structure 272ft E39.3-43.9 Idaho National Guard Orchard Training Area Crossed47.9-48.8 Guffey Butte/Black Butte Archaeological Area Crossed48.8-54 Birds of Prey Avoidance Area Crossed54.4-60.8 Morley Nelson Snake River Birds of Prey NCA Crossed54.4-60.8 Birds of Prey Avoidance Area Crossed58.8-59 Oregon Trail SRMA Crossed59.7-60.8 Owyhee Front SRMA Crossed59.8-60.9 Black Mountain HMA Crossed

99 Alternative 9H

Alternative 9G 10 Proposed – Total Length

Table D.17-1 Page 12 of 12
Gateway West Transmission Line Draft EIS

Table D.19-1. Roads, Railroads and Bridges Within One Mile of Project Centerline

County-Maintained 

Highways or 

Numbered/Lettered 

Routes State Highway US Highway Interstate

Proposed – Total Length 100.6 30.5 4.1 2.8 13.4 50Proposed – Comparison portion for Alternative 1E-A 17.6 12.5 2.0 2.8 13.4 30Alternative 1E-A 16.1 11.0 t2/ 2.0 4.2 17

Proposed – Comparison portion for Alternative 1E-B 37.9 8.6 2.1 10Alternative 1E-B 59.3 6.6 8.4 15Proposed – Comparison portion for Alternative 1E-C 75.4 17.2 2.1 19Alternative 1E-C 48.7 6.4 17.6 241W(a) Proposed – Total Length 76.5 11.8 20.0 2.2 5.6 39Proposed – Comparison portion for Alternative 1W-A 20.3 3.9 2.7 2.2 5.6 14Alternative 1W-A 16.2 14.5 t2/ 2.0 4.2 201W(c) Proposed – Total Length 70.6 17.2 16.7 2.0 7.1 43Proposed – Total Length 96.7 9.0 6.7 19.6 10.4 45Proposed – Comparison portion for Alternative 2A 28.8 0.3 2.1 16.4 10.4 29Alternative 2A 28.4 1.8 3.0 5.5 10.4 20Proposed – Comparison portion for Alternative 2B 7.0 0.3 9.7 10Alternative 2B 6.2 1.8 10.0 11Proposed – Comparison portion for Alternative 2C 28.4 3.0 2.3 19.4 24Alternative 2C 24.4 3.7 3

3 Proposed – Total Length 56.5 18.8 9.1 40.9 68

Proposed – Total Length 203.0 50.5 27.3 17.5 95Proposed – Comparison portion for Alternatives 4A-4F 90.2 12.2 11.5 6.3 30Alternative 4A 85.2 14.7 12.0 6.0 32Alternative 4B 100.2 17.6 3.5 16.5 37Alternative 4C 101.6 15.1 2.8 30.9 48Alternative 4D 100.8 16.2 3.5 10.7 30Alternative 4E 102.2 13.8 2.8 25.2 41Alternative 4F 87.5 10.0 12.8 5.6 28Proposed – Total Length 54.6 2.0 1.3 11.0 14Proposed – Comparison portion for Alternatives 5A,B 25.3 

Alternative 5A 33.7Alternative 5B 44.4Proposed – Comparison portion for Alternatives 5C 33.2 Alternative 5C 26.1Proposed – Comparison portion for Alternatives 5D 19.4 0.9 5.9 6Alternative 5D 17.5 4.7 4Proposed – Comparison portion for Alternatives 5E 5.8 0.9 5.9 6Alternative 5E 5.3 1.0 5.2 6

6 Proposed – Total Length 0.5 1.5 1

Note: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactly

1/ Inventoried bridges include those carrying routes smaller than county lettered/numbered routes2/ "t" indicates only a trace amount (<0.1 mile) crossed

45

1W

2

Road Types (Miles)

Total 

Mi

Segment 

Number Proposed or Alternative Name

Segment 

Length (Miles)

1E

Table D.19-1 Page 1 of 2
Gateway West Transmission Line Draft EIS

Table D.19-1. Roads, Railroads and Bridges Within One Mile of Project Centerline cont.

County-Maintained 

Highways or 

Numbered/Lettered 

Routes State Highway US Highway Interstate

Proposed – Total Length 118.1 5.6 5.2 16.3 27Proposed – Comparison portion for Alternatives 7A,B 35.2 0.2 0Alternative 7A 38.0 0.6 0Alternative 7B 46.4 1.0 1Proposed – Comparison portion for Alternative 7C 20.1 11.0 11Alternative 7C 20.3 4.0 4Proposed – Comparison portion for Alternative 7D 6.2 2.4 4.1 6Alternative 7D 6.8 3.5 4.8 8Proposed – Comparison portion for Alternative 7E 3.8 1.3 2.1 3Alternative 7E 4.5 1.3 1.2 2Proposed – Comparison portion for Alternative 7F 10.5 1.3 2.1 3Alternative 7F 10.8 1.3 1.1 2Proposed – Comparison portion for Alternative 7G 3.1Alternative 7G 3.2Proposed – Comparison portion for Alternatives 7H,I 118.1 5.6 5.2 16.3 27Alternative 7H 127.5 1.9 8.1 11.6 21Alternative 7I 173.4 1.9 4.0 11.6 17Proposed – Comparison portion 7/9 for Alternative 7J 3/ 143.9 10.3 2.0 8.2 16

Alternative 7J3/ 202.1 4.6 2.0 5.7 9

Proposed – Total Length 131.0 1.3 8.6 5.9 9.1 25Proposed – Comparison portion for Alternative 8A 51.4 1.3 2.0 3.9 7Alternative 8A 53.6 3.2 0.7 2.0 10.3 16Proposed – Comparison portion for Alternative 8B 45.3 6.6 9.1 15Alternative 8B 45.8 4.3 3.1 11.5 18Proposed – Comparison portion for Alternative 8C 6.5 11.4 11Alternative 8C 6.4 5.5 5Proposed – Comparison portion for Alternative 8D 6.9Alternative 8D 8.1Proposed – Comparison portion for Alternative 8E 7.0Alternative 8E 18.5Proposed – Total Length 161.7 2.0 23.7 25Proposed – Comparison portion for Alternative 9A 7.8 0.2 0Alternative 9A 7.7 0.2 0Proposed – Comparison portion for Alternative 9B 49.5 

Alternative 9B 53.2 Proposed – Comparison portion for Alternative 9C 14.7 Alternative 9C 15.3 Proposed – Comparison portion for Alternatives 9D-9H 57.2 22.6 22Alternative 9D 58.4 10.5 10Alternative 9E 68.7 3.7 3Alternative 9F 62.9 11.8 11Alternative 9G 56.4 10.1 10Alternative 9H 61.0 11.9 11

10 Proposed – Total Length 33.6 2.3 6.1 1.8 4.0 14

Note: Mileages have been rounded to the nearest tenth of a mile; therefore, numbers are inexact and columns/rows may not sum exactly

1/ Inventoried bridges include those carrying routes smaller than county lettered/numbered routes2/ "t" indicates only a trace amount (<0.1 mile) crossed

Segment 

Number

3/ Alternative 7J connects with Segment 9 approximately 25.8 miles west of the proposed Cedar Hill Substation, which is the western terminus of Segment 7 and the beginning point for S

Segment 7/9 (118.1 miles of Segment 7 and 25.8 miles of Segment 9, for a total of 143.9 miles). All other Segment 7 alternatives are compared to Segment 7 of the Proposed Route (11

Proposed or Alternative Name

Segment 

Length (Miles)

Road Types (Miles)

Total 

Mi

978

Table D.19-1 Page 2 of 2