Subject: December 2023 Most Probable 24-Month Study

The operation of Lake Powell and Lake Mead in the December 2023 24-Month Study is pursuant to the December 2007 Record of Decision on Colorado River

Interim Guidelines for Lower Basin Shortages and the Coordinated Operations of Lake Powell and Lake Mead (Interim Guidelines) and reflects the 2023 Annual

Operating Plan (AOP) and draft 2024 AOP. Pursuant to the Interim Guidelines, the August 2023 24-Month Study projections of the January 1, 2024, system

storage and reservoir water surface elevations set the operational tier for the coordinated operation of Lake Powell and Lake Mead during 2024. 

Consistent with Section 2.D.1 of the Interim Guidelines, a Shortage Condition consistent with Section 2.D.1.b is governing the operation of Lake Mead for calendar

year (CY) 2023. In addition, Section III.B of Exhibit 1 to the Lower Basin Drought Contingency Plan (DCP) Agreement will govern the operation of Lake Mead for

CY 2023. Efforts to conserve additional water in Lake Mead under a 2021 Lower Basin Memorandum of Understanding (MOU) to facilitate near-term actions to

maintain the water surface elevation of Lake Mead and additional conservation efforts under the Lower Colorado River Basin System Conservation and Efficiency

Program (LC Conservation Program) will also take place in CY 2023.

The August 2023 24-Month study projected the January 1, 2024, Lake Powell elevation to be less than 3,575 feet and at or above 3,525 feet and the Lake Mead

elevation to be at or above 1,025 feet. Consistent with Section 6.C.1 of the Interim Guidelines the operational tier for Lake Powell in water year (WY) 2024 will be

the Mid-Elevation Release Tier and the water year release volume from Lake Powell will be 7.48 million acre-feet (maf). 

The 2022 Drought Response Operations Agreement (DROA) Plan1 for May 2022 through April 2023 was amended to suspend 2022 DROA Plan releases as of 

March 7, 2023. A total DROA release of approximately 463 thousand acre-feet (kaf) occurred under the 2022 DROA Plan. Reclamation will attempt to maximize

DROA recovery in the Upper Initial Units in WY 2023 and through April 2024. Reclamation will provide monthly DROA accounting, including DROA releases and

recovery, which can be found online at: https://www.usbr.gov/dcp/DROSummarySheet.pdf. 

In May of 2023, the DROA Parties agreed to the 2023 DROA Plan. The 2023 DROA Plan does not include any DROA releases, but rather provides for recovery of

prior DROA releases from the units upstream of Powell.

Reclamation will continue to carefully monitor hydrologic and operational conditions and assess the need for additional responsive actions and/or changes to

operations. Reclamation will continue to consult with the Basin States, Basin Tribes, Mexico, and other partners on Colorado River operations to consider and

determine whether additional measures should be taken to further enhance the preservation of these benefits, as well as recovery protocols, including those of

future protective measures for both Lakes Powell and Mead. 

1

 For more information: https://www.usbr.gov/uc/DocLibrary/Plans/20220429-2022DroughtResponseOperationsPlan-ApprovalMemo-508-DOI.pdf. 

To: All Annual Operating Plan Recipients

From: Noe Santos, P.E.

River Operations Manager

Boulder Canyon Operations Office

Interior Region 8: Lower Colorado Basin

 Email: nsantos@usbr.gov 

 

From: Alex Pivarnik

Supervisor, River Operations Group

Upper Colorado Operations Office

Interior Region 7: Upper Colorado Basin

 Email: apivarnik@usbr.gov 
The August 2023 24-Month Study projected the January 1, 2024 Lake Mead elevation to be below 1,075 feet and above 1,050 feet. Consistent with Section 2.D.1

of the Interim Guidelines, a Shortage Condition consistent with Section 2.D.1.a will govern the operation of Lake Mead for CY 2024. In addition, Section III.B of

Exhibit 1 to the Lower Basin DCP Agreement will also govern the operation of Lake Mead for CY 2024. Lower Basin projections for Lake Mead take into

consideration updated water orders to reflect additional conservation efforts under the LC Conservation Program.

The 2024 operational tier determinations for Lake Powell and Lake Mead will be documented in the 2024 AOP, which is currently in development.

Current runoff projections into Lake Powell are provided by the National Weather Service’s Colorado Basin River Forecast Center. The observed unregulated

inflow into Lake Powell for the month of November was 0.380 maf or 91% of the 30-year average from 1991 to 2020. The December 2023 unregulated inflow

forecast for Lake Powell is 0.315 maf or 98% of the 30-year average. The 2024 April through July unregulated inflow forecast for Lake Powell is 4.80 maf or 75%

of average. The WY 2024 unregulated inflow forecast for Lake Powell is 7.62 maf or 79% of average.

In this study, the CY 2023 diversion for Metropolitan Water District of Southern California (MWD) is projected to be 0.667 maf. The CY 2023 diversion for the

Central Arizona Project (CAP) is projected to be 0.830 maf. Consumptive use for Nevada above Hoover (SNWP Use) is projected to be 0.187 maf for CY 2023.

Due to changing Lake Mead elevations, Hoover’s generator capacity is adjusted based on estimated effective capacity and plant availability. The estimated

effective capacity is based on projected Lake Mead elevations. Unit capacity tests will be performed as the lake elevation changes. This study reflects these

changes in the projections.

Hoover, Davis, and Parker Dam historical gross energy figures come from Power, Operations, and Maintenance reports provided by the Lower Colorado Region’s

Power Office, Bureau of Reclamation, Boulder City, Nevada. Questions regarding these historical energy numbers can be directed to Rebecca Rogers at (702)

293-8091.
Runoff and inflow projections into upper basin reservoirs are provided by the National Weather Service’s Colorado Basin River Forecast Center and are as follows:

Reservoir Observed Inflow (kaf) Nov Inflow Forecast (kaf)

Aug Sep Oct Nov %Avg Dec Jan Feb 

Lake Powell 307 224 324 380 91% 315 340 360

Fontenelle 74 50 53 45 108% 38 35 33

Flaming Gorge 95 67 69 64 129% 42 48 50

Blue Mesa 49 26 30 28 94% 25 23 21

Morrow Point 49 27 31 29 92% 26 25 23

Crystal 52 29 32 31 87% 29 29 26

Taylor Park 8.8 5.5 6.1 5.1 108% 4.4 4.2 3.8

Vallecito 10.6 8.7 6.3 3.6 46% 4 3.8 3.5

Navajo -3.53 0.86 12.3 11.4 43% 11 12.5 16

Lemon 2 1.77 0.94 0.55 38% 0.5 0.5 0.5

McPhee 10 8.3 3.1 1.51 34% 2.8 3.2 3.6

Ridgway 11.2 5.8 5.2 4.3 79% 4 3.5 3.5

Deerlodge 19 8.2 19.9 24 80% 24 25 25

Durango 23 15 12.7 9.3 57% 10 10 10

The draft 2024 AOP is available online at:

https://www.usbr.gov/lc/region/g4000/AOP2024/AOP24_draft.pdf.

The 2023 AOP is available online at:

https://www.usbr.gov/uc/water/rsvrs/ops/aop/AOP23.pdf. 

The Interim Guidelines are available online at:

https://www.usbr.gov/lc/region/programs/strategies/RecordofDecision.pdf. 

The Colorado River DCPs are available online at:

https://www.usbr.gov/dcp/finaldocs.html. 

The 2021 Lower Basin MOU is available online at: 

https://www.usbr.gov/lc/region/g4000/2021_MOU.pdf. 

The Upper Basin DROA is online at:

https://www.usbr.gov/dcp/droa.html. 

The Upper Basin Hydrology Summary is available online at:

https://www.usbr.gov/uc/water/crsp/studies/24Month_12_ucb.pdf. 

Information on the LC Conservation Program is available online at: 

https://www.usbr.gov/lc/LCBConservation.html. 
Most Probable Inflow*

December 2023 24-Month Study

Fontenelle Reservoir

OPERATION PLAN FOR COLORADO RIVER SYSTEM RESERVOIRS

Reservoir Elev

End of Month

(Ft)

Live

Storage

(1000 Ac-Ft)

Total

Release

(1000 Ac-Ft)

Regulated

Inflow

Date (1000 Ac-Ft)

Evap

Losses

(1000 Ac-Ft)

Power

Release

(1000 Ac-Ft)

Bypass

Release

(1000 Ac-Ft)

* Dec 2022 29 1 56 2 58 6486.14 194

H Jan 2023 32 1 58 0 59 6481.53 167

I Feb 2023 28 0 10 43 53 6476.59 141

S Mar 2023 30 0 55 3 58 6470.02 113

T Apr 2023 75 1 61 0 61 6473.29 126

O May 2023 323 1 102 95 198 6494.66 250

R Jun 2023 413 2 92 269 361 6501.41 299

I Jul 2023 141 3 86 41 127 6502.91 310

C Aug 2023 74 2 71 3 74 6502.60 308

A Sep 2023 50 2 70 1 71 6499.60 285

WY 2023 1265 15 693 545 1238

L Oct 2023 53 1 65 3 68 6497.41 269

* Nov 2023 45 1 68 0 68 6494.04 246

Dec 2023 38 1 72 0 72 6488.83 211

Jan 2024 35 1 72 0 72 6482.60 173

Feb 2024 33 1 68 0 68 6475.81 138

Mar 2024 48 0 71 0 71 6470.40 114

Apr 2024 70 1 35 20 55 6473.90 129

May 2024 130 1 95 0 95 6480.87 163

Jun 2024 275 2 102 49 151 6499.54 285

Jul 2024 140 3 102 3 105 6503.89 318

Aug 2024 55 2 92 0 92 6498.71 279

Sep 2024 40 2 70 0 70 6494.23 247

WY 2024 961 15 911 74 985

Oct 2024 45 1 0 55 55 6492.56 235

Nov 2024 42 1 0 59 59 6489.89 218

Dec 2024 32 1 20 45 65 6484.60 184

Jan 2025 31 1 65 0 65 6478.40 150

Feb 2025 29 0 58 0 58 6471.93 120

Mar 2025 51 0 53 0 53 6471.29 118

Apr 2025 77 1 38 10 48 6477.58 146

May 2025 166 1 92 0 92 6490.04 219

Jun 2025 301 2 104 129 233 6499.43 284

Jul 2025 146 3 102 5 106 6504.38 321

Aug 2025 59 2 73 0 73 6502.23 305

Sep 2025 39 2 65 0 65 6498.42 277

WY 2025 1018 15 671 302 973

Oct 2025 45 1 68 0 68 6495.10 253

Nov 2025 42 1 65 0 65 6491.58 229

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3241 Processed On: 12/12/2023 12:51:19PM 
Most Probable Inflow*

December 2023 24-Month Study

Flaming Gorge Reservoir

OPERATION PLAN FOR COLORADO RIVER SYSTEM RESERVOIRS

Reservoir Elev

End of Month

(Ft)

Live

Storage

(1000 Ac-Ft)

Total

Release

(1000 Ac-Ft)

Evap

Losses

Date (1000 Ac-Ft)

Bank

Storage

(1000 Ac-Ft)

Power

Release

(1000 Ac-Ft)

Unreg

Inflow

(1000 Ac-Ft)

Jensen

Flow

(1000 Ac-Ft)

Bypass

Release

(1000 Ac-Ft)

Reg

Inflow

(1000 Ac-Ft)

* Dec 2022 26 57 2 107 0 107 96 6008.59 2540 135

H Jan 2023 38 65 2 108 0 108 95 6007.19 2497 143

I Feb 2023 33 58 2 98 0 98 93 6005.89 2457 134

S Mar 2023 49 77 3 61 5 66 93 6006.15 2465 119

T Apr 2023 188 181 4 48 0 48 98 6010.17 2589 403

O May 2023 521 397 7 49 0 49 111 6020.21 2917 1044

R Jun 2023 574 512 10 114 42 157 125 6029.59 3249 672

I Jul 2023 174 166 13 75 1 76 128 6031.49 3323 173

C Aug 2023 95 93 13 112 0 112 126 6030.69 3292 152

A Sep 2023 67 88 11 114 0 114 125 6029.77 3256 142

WY 2023 1847 1821 74 1099 48 1147 3391

L Oct 2023 69 84 7 100 0 100 124 6029.17 3233 137

* Nov 2023 64 85 4 89 0 89 124 6028.99 3226 126

Dec 2023 42 76 2 131 0 131 122 6027.51 3172 155

Jan 2024 48 85 2 131 0 131 120 6026.22 3126 156

Feb 2024 50 85 2 123 0 123 118 6025.12 3087 148

Mar 2024 100 123 3 74 0 74 120 6026.38 3132 134

Apr 2024 115 100 5 72 0 72 121 6027.00 3154 247

May 2024 185 150 7 184 0 184 119 6025.89 3114 634

Jun 2024 350 226 10 126 0 126 123 6028.32 3201 476

Jul 2024 155 120 13 76 0 76 124 6029.10 3230 131

Aug 2024 65 102 12 106 0 106 123 6028.68 3215 122

Sep 2024 46 76 11 104 0 104 122 6027.66 3178 120

WY 2024 1289 1311 77 1316 0 1316 2585

Oct 2024 52 62 7 72 0 72 121 6027.22 3162 98

Nov 2024 51 68 3 64 0 64 121 6027.25 3163 96

Dec 2024 34 67 2 92 0 92 120 6026.51 3136 117

Jan 2025 42 76 2 92 0 92 120 6026.02 3119 117

Feb 2025 43 72 2 83 0 83 119 6025.66 3106 108

Mar 2025 85 87 3 57 0 57 120 6026.40 3133 131

Apr 2025 111 82 5 55 0 55 121 6026.99 3154 258

May 2025 239 165 7 198 0 198 119 6025.91 3115 711

Jun 2025 389 321 10 98 0 98 128 6031.41 3320 465

Jul 2025 161 121 14 76 0 76 129 6032.17 3350 136

Aug 2025 66 80 13 106 0 106 127 6031.22 3313 125

Sep 2025 43 69 11 104 0 104 126 6030.08 3268 117

WY 2025 1316 1271 79 1098 0 1098 2480

Oct 2025 52 75 7 74 0 74 125 6029.92 3262 100

Nov 2025 50 73 4 62 0 62 126 6030.11 3269 92

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3241 Processed On: 12/12/2023 12:51:19PM 
Most Probable Inflow*

December 2023 24-Month Study

Taylor Park Reservoir

OPERATION PLAN FOR COLORADO RIVER SYSTEM RESERVOIRS

Reservoir Elev

End of Month

(Ft)

Live

Storage

(1000 Ac-Ft)

Total

Release

(1000 Ac-Ft)

Regulated

Inflow

Date (1000 Ac-Ft)

* Dec 2022 5 5 9307.68 66

H Jan 2023 4 5 9307.08 65

I Feb 2023 4 5 9306.26 64

S Mar 2023 4 5 9305.50 63

T Apr 2023 7 9 9304.30 61

O May 2023 39 20 9316.35 80

R Jun 2023 50 28 9328.01 102

I Jul 2023 22 26 9326.25 99

C Aug 2023 9 21 9319.91 87

A Sep 2023 6 15 9314.22 77

WY 2023 159 151

L Oct 2023 6 6 9314.04 77

* Nov 2023 5 6 9313.41 75

Dec 2023 4 6 9312.11 73

Jan 2024 4 6 9310.78 71

Feb 2024 4 6 9309.81 70

Mar 2024 5 6 9309.08 68

Apr 2024 8 9 9308.44 67

May 2024 25 15 9314.60 77

Jun 2024 39 18 9326.10 98

Jul 2024 15 21 9322.97 92

Aug 2024 8 18 9317.49 82

Sep 2024 6 15 9312.20 73

WY 2024 129 133

Oct 2024 7 9 9310.97 71

Nov 2024 5 5 9310.94 71

Dec 2024 4 5 9310.16 70

Jan 2025 5 5 9310.03 70

Feb 2025 4 5 9309.53 69

Mar 2025 5 5 9309.40 69

Apr 2025 9 9 9309.40 69

May 2025 26 15 9316.06 80

Jun 2025 40 18 9327.88 102

Jul 2025 15 21 9324.81 96

Aug 2025 8 18 9319.45 86

Sep 2025 7 18 9313.11 75

WY 2025 135 134

Oct 2025 7 9 9311.90 73

Nov 2025 5 5 9311.86 73

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3241 Processed On: 12/12/2023 12:51:19PM 
Most Probable Inflow*

December 2023 24-Month Study

Blue Mesa Reservoir

OPERATION PLAN FOR COLORADO RIVER SYSTEM RESERVOIRS

Reservoir Elev

End of Month

(Ft)

Live

Storage

(1000 Ac-Ft)

Total

Release

(1000 Ac-Ft)

Regulated

Inflow

Date (1000 Ac-Ft)

Evap

Losses

(1000 Ac-Ft)

Power

Release

(1000 Ac-Ft)

Bypass

Release

(1000 Ac-Ft)

UnReg

Inflow

(1000 Ac-Ft)

* Dec 2022 24 25 0 6 10 17 7446.44 290

H Jan 2023 24 25 0 20 0 20 7447.43 295

I Feb 2023 20 21 0 20 0 20 7447.61 296

S Mar 2023 25 26 0 19 0 19 7448.79 303

T Apr 2023 77 79 1 23 0 23 7458.56 358

O May 2023 327 309 1 77 0 77 7491.44 589

R Jun 2023 312 290 1 106 6 131 7510.36 747

I Jul 2023 117 120 1 125 1 126 7509.50 739

C Aug 2023 49 61 1 105 0 105 7504.26 694

A Sep 2023 26 36 1 15 85 100 7496.50 629

WY 2023 1060 1052 8 517 170 706

L Oct 2023 30 30 1 30 33 63 7492.37 596

* Nov 2023 28 29 0 33 0 33 7491.85 592

Dec 2023 25 27 0 37 0 37 7490.62 583

Jan 2024 23 25 0 34 0 34 7489.47 574

Feb 2024 21 23 0 32 0 32 7488.17 563

Mar 2024 32 33 0 35 0 35 7487.90 561

Apr 2024 60 61 1 52 0 52 7488.94 569

May 2024 170 160 1 136 0 136 7491.83 592

Jun 2024 230 209 1 63 0 63 7509.20 736

Jul 2024 75 81 2 102 0 102 7506.59 714

Aug 2024 50 60 1 107 0 107 7500.91 666

Sep 2024 33 42 1 95 0 95 7494.30 612

WY 2024 777 780 9 756 33 789

Oct 2024 36 38 1 73 0 73 7489.85 576

Nov 2024 30 30 0 24 0 24 7490.62 583

Dec 2024 26 27 0 28 0 28 7490.52 582

Jan 2025 25 25 0 34 0 34 7489.37 573

Feb 2025 23 24 0 30 0 30 7488.53 566

Mar 2025 38 38 0 37 0 37 7488.66 567

Apr 2025 78 78 1 51 0 51 7491.96 593

May 2025 204 193 1 147 0 147 7497.53 638

Jun 2025 251 229 1 65 0 65 7516.34 800

Jul 2025 86 92 2 99 0 99 7515.41 791

Aug 2025 55 65 1 103 0 103 7511.03 752

Sep 2025 35 46 1 97 0 97 7505.00 700

WY 2025 887 886 9 788 0 788

Oct 2025 36 38 1 87 0 87 7499.11 651

Nov 2025 31 31 0 51 0 51 7496.68 631

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3241 Processed On: 12/12/2023 12:51:19PM 
Most Probable Inflow*

December 2023 24-Month Study

Morrow Point Reservoir

OPERATION PLAN FOR COLORADO RIVER SYSTEM RESERVOIRS

Reservoir Elev

End of Month

(Ft)

Total

Release

(1000 Ac-Ft)

Blue Mesa

Release

Date (1000 Ac-Ft)

Side

Inflow

(1000 Ac-Ft)

Power

Release

(1000 Ac-Ft)

Bypass

Release

(1000 Ac-Ft)

Unreg

Inflow

(1000 Ac-Ft)

Live

Storage

(1000 Ac-Ft)

Total

Inflow

(1000 Ac-Ft)

* Dec 2022 26 17 2 18 20 0 20 7141.82 103

H Jan 2023 26 20 2 21 20 0 20 7144.03 105

I Feb 2023 21 20 1 21 18 0 18 7148.07 108

S Mar 2023 26 19 2 21 19 0 19 7149.91 109

T Apr 2023 85 23 8 31 30 0 30 7151.54 110

O May 2023 364 77 37 114 112 0 112 7153.72 112

R Jun 2023 331 131 18 149 142 2 149 7153.53 112

I Jul 2023 121 126 4 130 130 0 130 7152.51 111

C Aug 2023 49 105 0 105 105 0 105 7152.17 111

A Sep 2023 27 100 1 100 102 0 102 7150.01 109

WY 2023 1136 706 76 782 780 2 787

L Oct 2023 31 63 1 64 68 0 68 7144.23 105

* Nov 2023 29 33 1 33 33 0 33 7145.52 106

Dec 2023 26 37 1 38 31 0 31 7153.73 112

Jan 2024 25 34 2 36 36 0 36 7153.73 112

Feb 2024 23 32 2 34 34 0 34 7153.73 112

Mar 2024 36 35 4 39 39 0 39 7153.73 112

Apr 2024 70 52 10 62 62 0 62 7153.73 112

May 2024 195 136 25 161 161 0 161 7153.73 112

Jun 2024 250 63 20 83 83 0 83 7153.72 112

Jul 2024 80 102 5 107 107 0 107 7153.73 112

Aug 2024 53 107 3 110 110 0 110 7153.73 112

Sep 2024 35 95 2 97 97 0 97 7153.73 112

WY 2024 852 789 76 865 861 0 861

Oct 2024 37 73 1 74 74 0 74 7153.73 112

Nov 2024 32 24 2 26 26 0 26 7153.73 112

Dec 2024 27 28 1 29 29 0 29 7153.73 112

Jan 2025 26 34 1 35 35 0 35 7153.73 112

Feb 2025 25 30 2 32 32 0 32 7153.73 112

Mar 2025 40 37 2 39 39 0 39 7153.73 112

Apr 2025 89 51 11 62 62 0 62 7153.73 112

May 2025 226 147 22 169 169 0 169 7153.73 112

Jun 2025 265 65 14 79 79 0 79 7153.72 112

Jul 2025 90 99 4 103 103 0 103 7153.73 112

Aug 2025 56 103 1 104 104 0 104 7153.73 112

Sep 2025 36 97 1 98 98 0 98 7153.73 112

WY 2025 949 788 62 850 849 0 849

Oct 2025 37 87 1 88 88 0 88 7153.73 112

Nov 2025 32 51 1 52 52 0 52 7153.73 112

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3241 Processed On: 12/12/2023 12:51:19PM 
Most Probable Inflow*

December 2023 24-Month Study

Crystal Reservoir

OPERATION PLAN FOR COLORADO RIVER SYSTEM RESERVOIRS

Reservoir Elev

End of Month

(Ft)

Live

Storage

(1000 Ac-Ft)

Total

Release

(1000 Ac-Ft)

Morrow

Release

Date (1000 Ac-Ft)

Total

Inflow

(1000 Ac-Ft)

Bypass

Release

(1000 Ac-Ft)

Below Tunnel

Flow

(1000 Ac-Ft)

Unreg

Inflow

(1000 Ac-Ft)

Tunnel

Flow

(1000 Ac-Ft)

Power

Release

(1000 Ac-Ft)

Side

Inflow

(1000 Ac-Ft)

* Dec 2022 28 20 2 22 22 0 22 6751.64 17 2 21

H Jan 2023 28 20 2 22 22 0 22 6751.37 16 2 21

I Feb 2023 23 18 2 20 4 16 20 6751.71 17 1 19

S Mar 2023 29 19 2 22 0 22 22 6751.16 16 2 21

T Apr 2023 97 30 12 42 20 21 41 6752.29 17 19 22

O May 2023 406 112 42 154 108 41 155 6751.26 16 48 112

R Jun 2023 357 149 26 176 119 34 174 6757.16 18 63 125

I Jul 2023 128 130 7 137 117 20 138 6752.61 17 67 77

C Aug 2023 52 105 3 108 108 0 108 6751.75 17 66 45

A Sep 2023 29 102 2 104 104 0 104 6752.00 17 63 42

WY 2023 1243 787 106 894 698 167 893 374 547

L Oct 2023 32 68 1 69 32 39 70 6747.66 15 49 24

* Nov 2023 31 33 3 35 35 0 35 6747.08 15 14 20

Dec 2023 29 31 3 34 33 0 33 6753.04 17 0 33

Jan 2024 29 36 4 40 40 0 40 6753.04 17 0 40

Feb 2024 26 34 3 37 37 0 37 6753.04 17 0 37

Mar 2024 42 39 6 45 45 0 45 6753.04 17 5 40

Apr 2024 80 62 10 72 72 0 72 6753.04 17 42 30

May 2024 225 161 30 191 134 57 191 6753.04 17 62 129

Jun 2024 280 83 30 113 113 0 113 6753.03 17 61 52

Jul 2024 90 107 10 117 117 0 117 6753.04 17 65 52

Aug 2024 60 110 7 117 117 0 117 6753.04 17 65 52

Sep 2024 39 97 4 101 101 0 101 6753.04 17 55 46

WY 2024 963 861 111 972 875 96 971 419 554

Oct 2024 43 74 6 80 56 23 80 6753.04 17 55 25

Nov 2024 36 26 4 30 30 0 30 6753.04 17 0 30

Dec 2024 32 29 5 34 34 0 34 6753.04 17 0 34

Jan 2025 31 35 5 40 40 0 40 6753.04 17 0 40

Feb 2025 29 32 4 36 36 0 36 6753.04 17 0 36

Mar 2025 46 39 6 45 45 0 45 6753.04 17 5 40

Apr 2025 100 62 11 73 73 0 73 6753.04 17 42 31

May 2025 251 169 25 194 134 60 194 6753.04 17 62 132

Jun 2025 293 79 28 107 107 0 107 6753.03 17 61 46

Jul 2025 98 103 8 111 111 0 111 6753.04 17 65 46

Aug 2025 63 104 7 111 111 0 111 6753.04 17 65 46

Sep 2025 42 98 6 104 104 0 104 6753.04 17 55 49

WY 2025 1064 849 115 964 881 83 964 410 554

Oct 2025 43 88 6 94 60 33 94 6753.04 17 49 45

Nov 2025 37 52 5 57 57 0 57 6753.04 17 49 8

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3241 Processed On: 12/12/2023 12:51:19PM 
Most Probable Inflow*

December 2023 24-Month Study

Vallecito Reservoir

OPERATION PLAN FOR COLORADO RIVER SYSTEM RESERVOIRS

Reservoir Elev

End of Month

(Ft)

Live

Storage

(1000 Ac-Ft)

Total

Release

(1000 Ac-Ft)

Regulated

Inflow

Date (1000 Ac-Ft)

* Dec 2022 5 0 7641.15 67

H Jan 2023 5 0 7643.44 72

I Feb 2023 5 2 7644.74 75

S Mar 2023 7 36 7630.44 46

T Apr 2023 36 45 7625.05 36

O May 2023 119 64 7651.55 91

R Jun 2023 75 41 7664.54 124

I Jul 2023 22 37 7658.55 108

C Aug 2023 11 38 7647.43 81

A Sep 2023 9 32 7636.60 57

WY 2023 314 299

L Oct 2023 6 9 7635.08 54

* Nov 2023 4 0 7636.68 57

Dec 2023 4 2 7637.71 60

Jan 2024 4 2 7638.72 62

Feb 2024 4 2 7639.76 64

Mar 2024 5 2 7641.15 67

Apr 2024 13 2 7646.05 78

May 2024 58 31 7656.87 104

Jun 2024 42 43 7656.38 103

Jul 2024 14 41 7644.77 75

Aug 2024 11 38 7631.62 48

Sep 2024 10 29 7619.32 28

WY 2024 175 201

Oct 2024 13 16 7616.50 25

Nov 2024 8 2 7621.22 31

Dec 2024 7 2 7624.69 36

Jan 2025 6 2 7627.24 40

Feb 2025 5 2 7629.15 43

Mar 2025 10 2 7633.55 51

Apr 2025 23 2 7643.65 72

May 2025 68 31 7658.71 109

Jun 2025 62 49 7663.61 122

Jul 2025 21 42 7655.50 101

Aug 2025 15 38 7645.87 77

Sep 2025 16 30 7639.55 64

WY 2025 254 216

Oct 2025 13 17 7637.44 59

Nov 2025 9 2 7640.83 66

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3241 Processed On: 12/12/2023 12:51:19PM 
Most Probable Inflow*

December 2023 24-Month Study

Navajo Reservoir

OPERATION PLAN FOR COLORADO RIVER SYSTEM RESERVOIRS

Reservoir Elev

End of Month

(Ft)

Live

Storage

(1000 Ac-Ft)

Total

Release

(1000 Ac-Ft)

Azotea

Tunnel Div

Date (1000 Ac-Ft)

Reg

Inflow

(1000 Ac-Ft)

Evap

Losses

(1000 Ac-Ft)

NIIP

Diversion

(1000 Ac-Ft)

Mod Unreg

Inflow

(1000 Ac-Ft)

Farmington

Flow

(1000 Ac-Ft)

* Dec 2022 17 0 12 0 0 22 6018.45 852 37

H Jan 2023 20 0 15 0 0 20 6017.85 847 34

I Feb 2023 18 0 15 1 1 18 6017.38 843 31

S Mar 2023 71 0 98 1 3 18 6025.86 920 46

T Apr 2023 245 24 235 2 8 21 6045.83 1124 108

O May 2023 488 59 375 3 28 127 6063.70 1340 344

R Jun 2023 249 47 163 4 38 168 6060.10 1294 342

I Jul 2023 46 11 49 4 45 32 6057.46 1261 82

C Aug 2023 -3 1 23 3 42 42 6052.15 1196 45

A Sep 2023 1 0 24 3 25 46 6047.88 1147 47

WY 2023 1219 145 1059 24 195 565 1203

L Oct 2023 12 0 16 2 7 32 6045.70 1122 39

* Nov 2023 12 0 8 1 0 20 6044.53 1109 34

Dec 2023 11 0 9 1 0 19 6043.53 1098 30

Jan 2024 13 0 11 1 0 19 6042.74 1090 30

Feb 2024 16 0 14 1 0 17 6042.33 1085 28

Mar 2024 45 3 39 1 6 18 6043.57 1099 33

Apr 2024 92 10 71 2 21 19 6046.09 1127 49

May 2024 195 26 143 3 36 18 6053.47 1212 130

Jun 2024 120 14 106 4 52 18 6056.18 1245 133

Jul 2024 30 2 56 4 55 34 6053.05 1207 74

Aug 2024 25 2 50 3 46 35 6050.11 1172 62

Sep 2024 30 1 48 3 25 30 6049.30 1163 52

WY 2024 601 58 569 25 248 280 695

Oct 2024 35 2 37 2 9 18 6050.01 1171 41

Nov 2024 30 1 23 1 0 18 6050.37 1175 35

Dec 2024 24 0 19 1 0 18 6050.34 1175 33

Jan 2025 22 0 18 1 0 18 6050.23 1174 31

Feb 2025 29 1 25 1 0 17 6050.84 1181 29

Mar 2025 92 10 74 2 5 18 6054.91 1229 41

Apr 2025 147 18 107 2 21 18 6060.25 1296 69

May 2025 251 34 180 4 35 18 6069.49 1418 153

Jun 2025 187 25 149 5 51 18 6074.80 1493 162

Jul 2025 33 2 51 5 55 29 6072.17 1456 80

Aug 2025 24 1 45 4 47 33 6069.45 1418 62

Sep 2025 31 2 43 3 26 101 6062.98 1331 127

WY 2025 905 96 771 28 249 325 864

Oct 2025 35 2 38 2 9 18 6063.60 1339 41

Nov 2025 30 1 22 1 0 18 6063.83 1342 36

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3241 Processed On: 12/12/2023 12:51:19PM 
Most Probable Inflow*

December 2023 24-Month Study

Lake Powell

OPERATION PLAN FOR COLORADO RIVER SYSTEM RESERVOIRS

Reservoir Elev

End of Month

(Ft)

Bank

Storage

(1000 Ac-Ft)

Total

Release

(1000 Ac-Ft)

Regulated

Inflow

Date (1000 Ac-Ft)

Evap

Losses

(1000 Ac-Ft)

Bypass

Release

(1000 Ac-Ft)

Lees

Ferry Gage

(1000 Ac-Ft)

Unreg

Inflow

(1000 Ac-Ft)

EOM

Storage

(1000 Ac-Ft)

PowerPlant

Release

(1000 Ac-Ft)

* Dec 2022 281 358 13 550 0 550 3524.75 4496 5531 560

H Jan 2023 361 424 4 500 0 501 3523.45 4490 5456 510

I Feb 2023 270 337 4 480 0 480 3521.04 4479 5320 493

S Mar 2023 573 552 6 486 0 486 3522.02 4484 5375 500

T Apr 2023 1399 1103 10 819 90 909 3524.99 4497 5544 929

O May 2023 4520 3634 15 1088 0 1088 3561.42 4685 7888 1107

R Jun 2023 3646 2916 31 1064 0 1064 3583.47 4820 9574 1082

I Jul 2023 1054 923 40 1149 0 1149 3580.42 4800 9328 1164

C Aug 2023 307 454 39 902 0 902 3574.71 4764 8878 908

A Sep 2023 224 414 35 474 0 474 3573.58 4757 8790 475

WY 2023 13421 12043 230 8491 90 8581 8730

L Oct 2023 324 432 24 480 0 480 3572.71 4752 8724 480

* Nov 2023 380 418 23 500 0 500 3571.43 4744 8626 509

Dec 2023 315 416 18 600 0 600 3568.94 4729 8439 603

Jan 2024 340 440 5 723 0 723 3565.34 4707 8172 727

Feb 2024 360 446 6 639 0 639 3562.81 4693 7988 650

Mar 2024 500 459 9 675 0 675 3559.89 4676 7779 689

Apr 2024 700 608 15 601 0 601 3559.78 4675 7771 618

May 2024 1450 1299 18 599 0 599 3568.47 4726 8403 620

Jun 2024 1950 1523 31 628 0 628 3578.86 4790 9203 645

Jul 2024 700 709 39 709 0 709 3578.40 4787 9167 724

Aug 2024 300 455 38 758 0 758 3574.37 4762 8852 772

Sep 2024 300 446 35 568 0 568 3572.48 4750 8707 584

WY 2024 7619 7652 262 7480 0 7480 7621

Oct 2024 417 467 24 480 0 480 3572.04 4748 8673 496

Nov 2024 442 437 23 500 0 500 3570.99 4741 8593 505

Dec 2024 361 416 18 600 0 600 3568.50 4726 8405 603

Jan 2025 350 406 5 723 0 723 3564.45 4702 8107 727

Feb 2025 397 433 6 639 0 639 3561.74 4687 7911 650

Mar 2025 614 527 9 675 0 675 3559.70 4675 7765 689

Apr 2025 920 748 15 601 0 601 3561.41 4685 7887 618

May 2025 2060 1799 19 599 0 599 3576.03 4772 8981 620

Jun 2025 2423 1853 33 628 0 628 3589.62 4860 10084 645

Jul 2025 711 692 42 709 0 709 3588.97 4856 10029 724

Aug 2025 371 515 42 758 0 758 3585.81 4835 9766 772

Sep 2025 316 537 38 568 0 568 3585.03 4830 9702 584

WY 2025 9382 8830 275 7480 0 7480 7633

Oct 2025 417 484 26 643 0 643 3582.93 4816 9530 659

Nov 2025 450 471 25 642 0 642 3580.68 4802 9348 647

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3241 Processed On: 12/12/2023 12:51:19PM 
Most Probable Inflow*

December 2023 24-Month Study

Hoover Dam - Lake Mead

OPERATION PLAN FOR COLORADO RIVER SYSTEM RESERVOIRS

Reservoir Elev

End of Month

(Ft)

Bank

Storage

(1000 Ac-Ft)

SNWP

Use

(1000 Ac-Ft)

Side Inflow

Glen to Hoover

Date (1000 Ac-Ft)

Evap

Losses

(1000 Ac-Ft)

Total

Release

(1000 Ac-Ft)

Total

Release

(1000 CFS)

Glen

Release

(1000 Ac-Ft)

EOM

Storage

(1000 Ac-Ft)

Downstream

Requirements

(1000 Ac-Ft)

* Dec 2022 550 63 32 438 7.1 8 439 475 1044.82 7313

H Jan 2023 501 103 22 412 6.7 7 413 485 1046.97 7466

I Feb 2023 480 46 21 494 8.9 8 493 485 1047.02 7469

S Mar 2023 486 226 23 754 12.3 11 749 481 1046.03 7399

T Apr 2023 909 243 31 831 14.0 12 830 498 1049.69 7661

O May 2023 1088 185 40 855 13.9 22 772 520 1054.28 7995

R Jun 2023 1064 62 50 886 14.9 23 874 530 1056.39 8152

I Jul 2023 1149 61 48 760 12.4 30 758 553 1061.02 8501

C Aug 2023 902 112 54 580 9.4 25 580 574 1065.35 8834

A Sep 2023 474 126 53 492 8.3 16 462 577 1065.82 8871

WY 2023 8581 1340 458 7633 187 7518

L Oct 2023 480 31 50 487 7.9 14 520 574 1065.34 8833

* Nov 2023 500 41 44 533 9.0 9 532 571 1064.81 8792

Dec 2023 600 72 36 341 5.5 10 341 589 1068.25 9061

Jan 2024 723 75 25 484 7.9 10 484 606 1071.55 9323

Feb 2024 639 71 23 601 10.4 9 601 611 1072.45 9395

Mar 2024 675 97 25 809 13.2 15 809 606 1071.53 9321

Apr 2024 601 60 34 1020 17.2 15 1020 581 1066.68 8937

May 2024 599 37 42 993 16.1 22 993 555 1061.56 8542

Jun 2024 628 22 51 908 15.3 26 908 535 1057.41 8228

Jul 2024 709 55 48 812 13.2 28 812 527 1055.85 8111

Aug 2024 758 86 52 747 12.2 24 747 529 1056.11 8131

Sep 2024 568 72 50 643 10.8 21 643 524 1055.17 8061

WY 2024 7480 717 481 8378 201 8411

Oct 2024 480 77 48 473 7.7 16 473 525 1055.43 8080

Nov 2024 500 63 42 600 10.1 9 600 520 1054.31 7997

Dec 2024 600 72 34 540 8.8 9 540 525 1055.45 8081

Jan 2025 723 75 24 534 8.7 13 534 539 1058.31 8296

Feb 2025 639 71 22 571 10.3 9 571 546 1059.64 8396

Mar 2025 675 97 24 806 13.1 17 806 541 1058.71 8326

Apr 2025 601 60 32 1005 16.9 19 1005 517 1053.73 7954

May 2025 599 37 40 975 15.9 24 975 492 1048.52 7576

Jun 2025 628 22 47 903 15.2 33 903 472 1044.10 7262

Jul 2025 709 55 45 797 13.0 38 797 465 1042.53 7153

Aug 2025 758 86 49 743 12.1 40 743 466 1042.69 7164

Sep 2025 568 72 47 633 10.6 35 633 461 1041.67 7093

WY 2025 7480 786 453 8581 263 8581

Oct 2025 643 77 45 451 7.3 29 451 473 1044.30 7277

Nov 2025 642 63 40 587 9.9 16 587 477 1045.14 7336

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3241 Processed On: 12/12/2023 12:51:19PM 
Most Probable Inflow*

December 2023 24-Month Study

Davis Dam - Lake Mohave

OPERATION PLAN FOR COLORADO RIVER SYSTEM RESERVOIRS

Reservoir Elev

End of Month

(Ft)

EOM

Storage

(1000 Ac-Ft)

Total

Release

(1000 Ac-Ft)

Side

Inflow

Date (1000 Ac-Ft)

Evap

Losses

(1000 Ac-Ft)

Power

Release

(1000 Ac-Ft)

Spill

Release

(1000 Ac-Ft)

Hoover

Release

(1000 Ac-Ft)

Total

Release

(1000 CFS)

* Dec 2022 438 4 13 436 0 436 7.1 639.97 1617

H Jan 2023 412 2 9 347 0 347 5.6 642.12 1675

I Feb 2023 494 -18 8 444 0 444 8.0 643.00 1699

S Mar 2023 754 -6 10 705 0 705 11.5 644.17 1731

T Apr 2023 831 -11 13 844 0 844 14.2 642.84 1694

O May 2023 855 -10 14 859 0 859 14.0 641.83 1667

R Jun 2023 886 -15 14 819 0 819 13.8 643.22 1705

I Jul 2023 760 -15 12 736 0 736 12.0 643.06 1700

C Aug 2023 580 -14 16 555 0 555 9.0 642.86 1695

A Sep 2023 492 -7 16 563 0 578 9.7 638.85 1587

WY 2023 7633 -107 152 7365 0 7381

L Oct 2023 487 -1 14 547 0 547 8.9 635.96 1511

* Nov 2023 533 -18 13 397 0 397 6.7 639.94 1616

Dec 2023 341 -2 13 324 0 324 5.3 640.01 1618

Jan 2024 484 -11 9 415 0 415 6.8 641.80 1666

Feb 2024 601 -13 8 581 0 581 10.1 641.80 1666

Mar 2024 809 -10 10 755 0 755 12.3 643.05 1700

Apr 2024 1020 -14 13 996 0 996 16.7 643.00 1699

May 2024 993 -13 14 965 0 965 15.7 643.00 1699

Jun 2024 908 -21 14 873 0 873 14.7 643.00 1699

Jul 2024 812 -21 12 806 0 806 13.1 642.00 1671

Aug 2024 747 -17 15 715 0 715 11.6 642.00 1671

Sep 2024 643 -6 16 675 0 675 11.3 640.01 1617

WY 2024 8378 -146 151 8049 0 8049

Oct 2024 473 -11 14 631 0 631 10.3 633.00 1434

Nov 2024 600 -16 13 520 0 520 8.7 635.00 1486

Dec 2024 540 -2 13 407 0 407 6.6 639.51 1604

Jan 2025 534 -11 9 452 0 452 7.4 641.80 1666

Feb 2025 571 -13 8 551 0 551 9.9 641.80 1666

Mar 2025 806 -10 10 751 0 751 12.2 643.05 1700

Apr 2025 1005 -14 13 981 0 981 16.5 643.00 1699

May 2025 975 -13 14 947 0 947 15.4 643.00 1699

Jun 2025 903 -21 14 869 0 869 14.6 643.00 1699

Jul 2025 797 -21 12 791 0 791 12.9 642.00 1671

Aug 2025 743 -17 15 711 0 711 11.6 642.00 1671

Sep 2025 633 -6 16 664 0 664 11.2 640.01 1617

WY 2025 8581 -154 151 8276 0 8276

Oct 2025 451 -11 14 609 0 609 9.9 633.00 1434

Nov 2025 587 -16 13 507 0 507 8.5 635.00 1486

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3241 Processed On: 12/12/2023 12:51:19PM 
Most Probable Inflow*

December 2023 24-Month Study

Parker Dam - Lake Havasu

OPERATION PLAN FOR COLORADO RIVER SYSTEM RESERVOIRS

Reservoir Elev

End of Month

(Ft)

EOM

Storage

(1000 Ac-Ft)

Total

Release

(1000 Ac-Ft)

Evap

Losses

Date (1000 Ac-Ft)

CAP

Diversion

(1000 Ac-Ft)

MWD

Diversion

(1000 Ac-Ft)

Flow To

Mexico

(1000 CFS)

Davis

Release

(1000 Ac-Ft)

Flow To

Mexico

(1000 Ac-Ft)

Total

Release

(1000 CFS)

Side

Inflow

(1000 Ac-Ft)

* Dec 2022 436 14 7 277 4.5 101 63 447.06 562 87 1.4

H Jan 2023 347 16 6 261 4.2 54 40 447.14 564 125 2.0

I Feb 2023 444 1 8 370 6.7 16 40 447.47 570 130 2.3

S Mar 2023 705 39 9 553 9.0 70 91 448.31 586 168 2.7

T Apr 2023 844 51 11 669 11.2 49 169 447.68 574 153 2.6

O May 2023 859 31 13 655 10.7 73 166 446.26 547 135 2.2

R Jun 2023 819 16 15 636 10.7 70 69 448.25 585 130 2.2

I Jul 2023 736 17 17 634 10.3 70 22 448.36 587 131 2.1

C Aug 2023 555 22 17 485 7.9 61 19 447.78 576 105 1.7

A Sep 2023 578 13 15 462 7.8 43 55 448.12 582 123 2.1

WY 2023 7381 247 139 5730 816 867 1443

L Oct 2023 547 16 12 439 7.1 44 69 447.74 575 68 1.1

* Nov 2023 397 22 9 294 4.9 59 50 447.87 578 86 1.4

Dec 2023 324 17 7 258 4.2 58 40 446.50 552 82 1.3

Jan 2024 415 7 6 329 5.3 57 25 446.50 552 138 2.2

Feb 2024 581 4 8 427 7.4 90 54 446.50 552 124 2.2

Mar 2024 755 2 9 635 10.3 3 98 446.70 555 147 2.4

Apr 2024 996 7 11 733 12.3 93 118 448.70 593 147 2.5

May 2024 965 4 13 731 11.9 96 119 448.70 593 110 1.8

Jun 2024 873 10 16 706 11.9 93 58 448.70 593 116 2.0

Jul 2024 806 17 17 674 11.0 96 38 448.00 580 123 2.0

Aug 2024 715 19 17 582 9.5 96 39 447.50 571 102 1.7

Sep 2024 675 12 15 506 8.5 93 63 447.50 570 99 1.7

WY 2024 8049 137 139 6313 877 772 1342

Oct 2024 631 21 12 462 7.5 96 75 447.50 571 89 1.4

Nov 2024 520 14 9 372 6.3 93 56 447.50 570 115 1.9

Dec 2024 407 17 7 286 4.7 96 50 446.50 552 110 1.8

Jan 2025 452 7 6 326 5.3 71 50 446.50 552 138 2.2

Feb 2025 551 4 8 422 7.6 66 53 446.50 552 124 2.2

Mar 2025 751 2 9 625 10.2 12 95 446.70 555 147 2.4

Apr 2025 981 7 11 727 12.2 88 114 448.70 593 147 2.5

May 2025 947 4 13 728 11.8 84 114 448.70 593 110 1.8

Jun 2025 869 10 16 703 11.8 93 56 448.70 593 116 2.0

Jul 2025 791 17 17 660 10.7 97 37 448.00 580 123 2.0

Aug 2025 711 19 17 578 9.4 97 38 447.50 571 102 1.7

Sep 2025 664 12 15 497 8.4 94 61 447.50 570 99 1.7

WY 2025 8276 134 139 6386 986 799 1420

Oct 2025 609 21 12 453 7.4 84 72 447.50 571 89 1.4

Nov 2025 507 14 9 372 6.2 81 54 447.50 570 115 1.9

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3241 Processed On: 12/12/2023 12:51:19PM 
Most Probable Inflow*

December 2023 24-Month Study

Hoover Dam - Lake Mead

OPERATION PLAN FOR COLORADO RIVER SYSTEM RESERVOIRS

Reservoir Elev

End of Month

(Ft)

Hoover

Gross Energy

MKWH

Hoover

Static Head

(Ft)

Power

Release

Date (1000 CFS)

Percent of 

Units

Available KWH/AF

Change In

Storage

(1000 Ac-Ft)

Power

Release

(1000 Ac-Ft)

EOM

Storage

(1000 Ac-Ft)

Hoover Gen

Capacity

MW

* Dec 2022 438 7.1 1044.82 7313 126 403.20 975.8 152.9 72 348.9

H Jan 2023 412 6.7 1046.97 7466 152 403.66 866.6 143.8 64 348.8

I Feb 2023 494 8.9 1047.02 7469 4 399.03 810.5 175.9 60 356.5

S Mar 2023 754 12.3 1046.03 7399 -70 397.62 863.6 270.4 65 358.8

T Apr 2023 831 14.0 1049.69 7661 262 402.80 839.3 300.5 65 361.7

O May 2023 855 13.9 1054.28 7995 335 405.85 986.6 313.1 71 366.3

R Jun 2023 886 14.9 1056.39 8152 156 407.42 1080.0 326.9 78 369.0

I Jul 2023 760 12.4 1061.02 8501 349 413.93 1283.0 280.8 90 369.5

C Aug 2023 580 9.4 1065.35 8834 333 420.26 1308.1 212.8 90 366.9

A Sep 2023 492 8.3 1065.82 8871 37 419.70 1160.0 181.4 79 368.4

WY 2023 7632 2759.0

L Oct 2023 487 7.9 1065.34 8833 -37 421.11 1037.5 180.9 71 371.7

* Nov 2023 533 9.0 1064.81 8792 -41 421.57 948.0 199.5 66 374.5

Dec 2023 341 5.5 1068.25 9061 269 418.09 1063.1 122.4 72 359.2

Jan 2024 484 7.9 1071.55 9323 262 421.13 1023.0 183.2 69 378.7

Feb 2024 601 10.4 1072.45 9395 72 422.98 977.0 230.1 66 382.9

Mar 2024 809 13.2 1071.53 9321 -74 421.35 1151.1 311.1 77 384.3

Apr 2024 1020 17.2 1066.68 8937 -384 418.29 1093.0 389.7 76 381.8

May 2024 993 16.1 1061.56 8542 -395 412.10 1242.0 366.3 88 368.9

Jun 2024 908 15.3 1057.41 8228 -314 406.77 1314.9 332.4 95 366.2

Jul 2024 812 13.2 1055.85 8111 -117 403.70 1399.4 296.0 100 364.4

Aug 2024 747 12.2 1056.11 8131 20 403.39 1399.4 269.8 100 361.0

Sep 2024 643 10.8 1055.17 8061 -70 403.70 1386.6 229.3 100 356.5

WY 2024 8378 3110.6

Oct 2024 473 7.7 1055.43 8080 19 409.86 830.0 174.9 60 369.8

Nov 2024 600 10.1 1054.31 7997 -83 411.72 830.0 223.8 60 372.7

Dec 2024 540 8.8 1055.45 8081 84 409.25 895.0 196.1 63 363.3

Jan 2025 534 8.7 1058.31 8296 214 409.05 907.9 193.6 63 362.7

Feb 2025 571 10.3 1059.64 8396 101 411.08 821.5 213.7 56 373.9

Mar 2025 806 13.1 1058.71 8326 -70 410.73 839.9 305.7 58 379.3

Apr 2025 1005 16.9 1053.73 7954 -371 403.64 1338.1 363.6 93 361.6

May 2025 975 15.9 1048.52 7576 -378 399.25 1201.1 352.3 87 361.4

Jun 2025 903 15.2 1044.10 7262 -314 394.51 1173.5 320.5 87 354.8

Jul 2025 797 13.0 1042.53 7153 -110 390.53 1338.8 279.5 100 350.5

Aug 2025 743 12.1 1042.69 7164 11 390.16 1339.8 258.4 100 347.8

Sep 2025 633 10.6 1041.67 7093 -71 390.38 1333.3 217.3 100 343.2

WY 2025 8581 3099.4

Oct 2025 451 7.3 1044.30 7277 184 395.74 1051.6 159.5 78 353.8

Nov 2025 587 9.9 1045.14 7336 59 400.16 1001.0 210.2 74 358.3

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3241 Processed On: 12/12/2023 12:51:19PM 
Most Probable Inflow*

December 2023 24-Month Study

Davis Dam - Lake Mohave

OPERATION PLAN FOR COLORADO RIVER SYSTEM RESERVOIRS

Reservoir Elev

End of Month

(Ft)

Davis

Gross Energy

MKWH

Davis

Static Head

(Ft)

Power

Release

Date (1000 CFS)

Percent of 

Units

Available KWH/AF

Change In

Storage

(1000 Ac-Ft)

Power

Release

(1000 Ac-Ft)

EOM

Storage

(1000 Ac-Ft)

Davis Gen

Capacity

MW

* Dec 2022 436 7.1 639.97 1617 -7 140.89 159.6 53.9 63 123.5

H Jan 2023 347 5.6 642.12 1675 58 143.26 157.9 44.3 62 127.7

I Feb 2023 444 8.0 643.00 1699 24 141.81 185.8 56.7 73 127.8

S Mar 2023 705 11.5 644.17 1731 32 141.44 215.5 93.4 85 132.4

T Apr 2023 844 14.2 642.84 1694 -36 138.90 255.0 108.3 100 128.3

O May 2023 859 14.0 641.83 1667 -28 137.48 255.0 109.4 100 127.4

R Jun 2023 819 13.8 643.22 1705 38 141.71 249.9 103.9 98 126.9

I Jul 2023 736 12.0 643.06 1700 -4 143.75 250.1 94.0 98 127.6

C Aug 2023 555 9.0 642.86 1695 -5 143.43 255.0 71.5 100 128.7

A Sep 2023 563 9.7 638.85 1587 -108 139.25 204.0 73.6 80 130.8

WY 2023 7365 938.3

L Oct 2023 547 8.9 635.96 1511 -76 132.98 189.2 67.1 74 122.7

* Nov 2023 397 6.7 639.94 1616 105 140.75 156.4 50.0 61 125.9

Dec 2023 324 5.3 640.01 1618 2 140.23 167.8 41.0 66 126.3

Jan 2024 415 6.8 641.80 1666 49 140.46 164.5 52.6 65 126.5

Feb 2024 581 10.1 641.80 1666 0 139.91 200.5 73.2 79 126.0

Mar 2024 755 12.3 643.05 1700 34 139.67 210.6 95.0 83 125.8

Apr 2024 996 16.7 643.00 1699 -2 138.69 255.0 124.4 100 125.0

May 2024 965 15.7 643.00 1699 0 139.01 255.0 120.9 100 125.2

Jun 2024 873 14.7 643.00 1699 0 139.37 255.0 109.6 100 125.6

Jul 2024 806 13.1 642.00 1671 -27 139.43 255.0 101.3 100 125.6

Aug 2024 715 11.6 642.00 1671 0 139.49 255.0 89.9 100 125.7

Sep 2024 675 11.3 640.01 1617 -54 138.61 255.0 84.2 100 124.9

WY 2024 8049 1009.1

Oct 2024 631 10.3 633.00 1434 -183 134.54 227.0 76.5 89 121.2

Nov 2024 520 8.7 635.00 1486 51 132.67 159.8 62.2 63 119.5

Dec 2024 407 6.6 639.51 1604 118 136.88 154.7 50.2 61 123.3

Jan 2025 452 7.4 641.80 1666 62 139.95 156.3 57.0 61 126.1

Feb 2025 551 9.9 641.80 1666 0 139.98 156.6 69.5 61 126.1

Mar 2025 751 12.2 643.05 1700 34 139.69 194.1 94.5 76 125.9

Apr 2025 981 16.5 643.00 1699 -2 138.77 249.9 122.6 98 125.0

May 2025 947 15.4 643.00 1699 0 139.11 255.0 118.7 100 125.3

Jun 2025 869 14.6 643.00 1699 0 139.39 255.0 109.1 100 125.6

Jul 2025 791 12.9 642.00 1671 -27 139.52 255.0 99.5 100 125.7

Aug 2025 711 11.6 642.00 1671 0 139.51 255.0 89.4 100 125.7

Sep 2025 664 11.2 640.01 1617 -54 138.68 255.0 83.0 100 124.9

WY 2025 8276 1032.2

Oct 2025 609 9.9 633.00 1434 -183 134.69 227.0 73.9 89 121.3

Nov 2025 507 8.5 635.00 1486 51 132.77 159.8 60.6 63 119.6

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3241 Processed On: 12/12/2023 12:51:19PM 
Most Probable Inflow*

December 2023 24-Month Study

Parker Dam - Lake Havasu

OPERATION PLAN FOR COLORADO RIVER SYSTEM RESERVOIRS

Reservoir Elev

End of Month

(Ft)

Parker

Gross Energy

MKWH

Parker

Static Head

(Ft)

Power

Release

Date (1000 CFS)

Percent of 

Units

Available KWH/AF

Change In

Storage

(1000 Ac-Ft)

Power

Release

(1000 Ac-Ft)

EOM

Storage

(1000 Ac-Ft)

Parker Gen

Capacity

MW

* Dec 2022 277 4.5 447.06 562 0 82.38 60.0 18.5 50 66.8

H Jan 2023 261 4.2 447.14 564 2 81.41 72.6 17.3 60 66.4

I Feb 2023 357 6.7 447.47 570 6 81.43 94.3 25.4 79 71.2

S Mar 2023 553 9.0 448.31 586 16 81.24 120.0 38.6 100 69.8

T Apr 2023 669 11.2 447.68 574 -12 79.27 120.0 46.4 100 69.4

O May 2023 655 10.7 446.26 547 -26 78.52 116.1 45.3 97 69.2

R Jun 2023 636 10.7 448.25 585 37 79.10 120.0 44.0 100 69.2

I Jul 2023 634 10.3 448.36 587 2 82.12 120.0 44.1 100 69.6

C Aug 2023 485 7.9 447.78 576 -11 81.56 120.0 33.5 100 69.1

A Sep 2023 449 7.8 448.12 582 7 81.96 120.0 32.1 100 71.7

WY 2023 5703 395.3

L Oct 2023 439 7.1 447.74 575 -7 81.03 91.0 30.6 76 69.6

* Nov 2023 294 4.9 447.87 578 3 82.97 80.0 20.0 67 67.9

Dec 2023 258 4.2 446.50 552 -26 80.88 60.0 16.5 50 63.8

Jan 2024 329 5.3 446.50 552 0 79.57 73.5 22.0 61 66.7

Feb 2024 427 7.4 446.50 552 0 78.53 96.2 29.5 80 69.0

Mar 2024 635 10.3 446.70 555 4 77.35 115.2 43.5 96 68.5

Apr 2024 733 12.3 448.70 593 38 77.67 120.0 50.9 100 69.4

May 2024 731 11.9 448.70 593 0 78.84 120.0 51.3 100 70.3

Jun 2024 706 11.9 448.70 593 0 78.84 120.0 49.6 100 70.3

Jul 2024 674 11.0 448.00 580 -13 78.84 120.0 47.1 100 69.9

Aug 2024 582 9.5 447.50 571 -10 78.86 120.0 40.5 100 69.7

Sep 2024 506 8.5 447.50 570 0 79.03 120.0 35.2 100 69.5

WY 2024 6313 436.5

Oct 2024 462 7.5 447.50 571 0 79.49 90.0 32.5 75 70.3

Nov 2024 372 6.3 447.50 570 0 80.10 92.0 25.5 77 68.6

Dec 2024 286 4.7 446.50 552 -19 80.44 114.2 18.2 95 63.5

Jan 2025 326 5.3 446.50 552 0 79.59 94.8 21.8 79 66.8

Feb 2025 422 7.6 446.50 552 0 78.45 92.1 29.1 77 68.9

Mar 2025 625 10.2 446.70 555 4 77.41 120.0 42.9 100 68.5

Apr 2025 727 12.2 448.70 593 38 77.71 120.0 50.5 100 69.5

May 2025 728 11.8 448.70 593 0 78.85 120.0 51.2 100 70.3

Jun 2025 703 11.8 448.70 593 0 78.86 120.0 49.4 100 70.3

Jul 2025 660 10.7 448.00 580 -13 78.94 120.0 46.1 100 70.0

Aug 2025 578 9.4 447.50 571 -10 78.89 120.0 40.3 100 69.7

Sep 2025 497 8.4 447.50 570 0 79.10 120.0 34.6 100 69.5

WY 2025 6386 441.9

Oct 2025 453 7.4 447.50 571 0 79.55 90.0 31.9 75 70.3

Nov 2025 372 6.2 447.50 570 0 80.11 92.0 25.5 77 68.6

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3241 Processed On: 12/12/2023 12:51:19PM 
Most Probable Inflow*

December 2023 24-Month Study

Upper Basin Power

OPERATION PLAN FOR COLORADO RIVER SYSTEM RESERVOIRS

Fontenelle

Reservoir

1000 MWHR

Crystal

Reservoir

1000 MWHR

Glen

Canyon

Date 1000 MWHR

Flaming

Gorge

1000 MWHR

Blue 

Mesa

1000 MWHR

Morrow

Point

1000 MWHR 

* Dec 2022 199 40 1 6 2 4

H Jan 2023 182 41 4 5 2 4

I Feb 2023 172 37 5 6 0 1

S Mar 2023 173 23 4 6 0 3

Winter 2023 1083 220 15 49 16 15

T Apr 2023 291 17 5 9 3 4

O May 2023 412 18 21 40 20 7

R Jun 2023 439 43 32 50 22 8

I Jul 2023 483 29 38 45 22 8

C Aug 2023 374 44 31 37 21 6

A Sep 2023 194 44 4 35 20 6

Summer 2023 2195 194 131 215 109 39

L Oct 2023 199 38 8 23 6 6

* Nov 2023 206 34 9 10 5 6

Dec 2023 234 44 11 11 6 5

Jan 2024 280 44 10 13 7 5

Feb 2024 246 41 10 13 6 4

Mar 2024 259 25 10 14 8 4

Winter 2024 1424 227 58 84 38 29

Apr 2024 230 24 15 22 12 2

May 2024 231 62 40 58 23 6

Jun 2024 247 42 19 30 20 7

Jul 2024 282 26 31 39 20 8

Aug 2024 300 36 33 40 20 7

Sep 2024 223 35 29 35 17 5

Summer 2024 1512 225 167 224 113 34

Oct 2024 188 24 22 27 10 0

Nov 2024 196 22 7 9 5 0

Dec 2024 234 31 8 10 6 1

Jan 2025 279 31 10 13 7 4

Feb 2025 245 28 9 12 6 3

Mar 2025 259 19 11 14 8 3

Winter 2025 1402 155 66 84 42 12

Apr 2025 230 19 15 22 13 2

May 2025 233 67 44 61 23 6

Jun 2025 252 33 20 29 19 7

Jul 2025 288 26 31 37 19 8

Aug 2025 307 36 32 37 19 6

Sep 2025 229 35 30 35 18 5

Summer 2025 1540 216 173 222 111 34

Oct 2025 258 25 26 32 10 5

Nov 2025 257 21 15 19 10 5

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3241 Processed On: 12/12/2023 12:51:19PM
Most Probable Inflow*

December 2023 24-Month Study

Flood Control Criteria - Beginning of Month Conditions

OPERATION PLAN FOR COLORADO RIVER SYSTEM RESERVOIRS

Navajo

Date KAF

Flaming

Gorge

KAF

Blue

Mesa

KAF

Lake

Powell

KAF

Upper Basin

Total

KAF

Lake

Mead

KAF

Total

KAF

Flaming

Gorge

KAF

Blue

Mesa

KAF

Navajo

KAF

Lake

Powell

KAF

Tot or Max

Allow

KAF

Lake

Mead

KAF

Total

KAF

BOM Space

Required

KAF

Mead 

Sched Rel

KAF

Mead 

FC Rel

KAF

Sys

Cont

MAF

* * * * P R E D I C T E D S P A C E * * * * * * * * C R E D I T A B L E S P A C E * * * *

Dec 2023 539 232 539 14688 15997 18828 34825 539 232 539 1310 14688 18828 34825 4580 341 0 24.9

Jan 2024 628 242 550 14875 16295 18559 34854 628 242 550 1420 14875 18559 34854 5350 484 0 24.9

* * * * E F F E C T I V E S P A C E * * * *

Jan 2024 628 242 550 14875 16295 18559 34854 217 156 294 668 14875 18559 34102 5350 484 0 24.9

Feb 2024 712 251 558 15142 16663 18297 34960 301 167 303 770 15142 18297 34209 1500 601 0 24.7

Mar 2024 786 261 563 15326 16936 18225 35160 374 178 306 858 15326 18225 34409 1500 809 0 24.5

Apr 2024 765 263 549 15535 17112 18299 35411 348 181 286 815 15535 18299 34648 1500 1020 0 24.2

May 2024 728 255 521 15542 17047 18683 35729 305 173 234 712 15542 18683 34937 1500 993 0 24.5

Jun 2024 733 233 436 14911 16312 19078 35390 303 140 110 553 14911 19078 34542 1500 908 0 25.4

Jul 2024 525 88 403 14111 15127 19392 34519 79 -27 22 74 14111 19392 33576 1500 812 0 25.2

* * * * C R E D I T A B L E S P A C E * * * *

Aug 2024 463 111 441 14147 15161 19509 34670 463 111 441 1014 14147 19509 34670 1500 747 0 24.8

Sep 2024 517 159 476 14462 15614 19489 35103 517 159 476 1152 14462 19489 35103 2270 643 0 24.4

Oct 2024 586 213 485 14607 15891 19559 35450 586 213 485 1284 14607 19559 35450 3040 473 0 24.1

Nov 2024 614 248 477 14641 15980 19540 35519 614 248 477 1338 14641 19540 35519 3810 600 0 24.0

Dec 2024 630 242 472 14721 16066 19623 35688 630 242 472 1345 14721 19623 35688 4580 540 0 23.9

Jan 2025 690 243 473 14908 16314 19539 35853 690 243 473 1406 14908 19539 35853 5350 534 0 23.8

* * * * E F F E C T I V E S P A C E * * * *

Jan 2025 690 243 473 14908 16314 19539 35853 410 241 467 1118 14908 19539 35565 5350 534 0 23.8

Feb 2025 742 252 474 15207 16675 19324 35999 460 250 468 1178 15207 19324 35710 1500 571 0 23.7

Mar 2025 784 258 467 15403 16912 19224 36136 500 257 460 1218 15403 19224 35844 1500 806 0 23.6

Apr 2025 760 257 419 15549 16985 19294 36279 472 256 405 1133 15549 19294 35976 1500 1005 0 23.5

May 2025 711 232 352 15427 16721 19666 36387 417 230 315 962 15427 19666 36054 1500 975 0 24.5

Jun 2025 677 187 230 14333 15427 20044 35470 376 173 154 702 14333 20044 35079 1500 903 0 25.8

Jul 2025 407 25 154 13230 13816 20358 34173 85 -13 23 95 13230 20358 33682 1500 797 0 25.6

* * * * C R E D I T A B L E S P A C E * * * *

Aug 2025 340 33 192 13284 13850 20467 34317 340 33 192 565 13284 20467 34317 1500 743 0 25.2

Sep 2025 393 72 230 13548 14243 20456 34699 393 72 230 696 13548 20456 34699 2270 633 0 24.8

Oct 2025 466 125 317 13612 14519 20527 35046 466 125 317 907 13612 20527 35046 3040 451 0 24.5

Nov 2025 496 174 309 13784 14762 20343 35105 496 174 309 978 13784 20343 35105 3810 587 0 24.4

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3241 Processed On: 12/12/2023 12:51:19PM