Subject: August 2023 Most Probable 24-Month Study

The operation of Lake Powell and Lake Mead in the August 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). Pursuant to the Interim Guidelines, the August 2022 24-Month Study projections of the January 1, 2023, system storage and reservoir water surface 

elevations set the operational tier for the coordinated operation of Lake Powell and Lake Mead during 2023. 

Consistent with Section 6.D.1 of the Interim Guidelines, Lake Powell’s operation in water year (WY) 2023 is governed by the Lower Elevation Balancing Tier with 

an initial projected water year release volume of 7.00 million acre-feet (maf). Based on hydrologic conditions in April 2023, Reclamation determined that conditions 

were sufficient to release up to 9.50 maf from Lake Powell in WY 2023, consistent with Section 6.D.1 of the Interim Guidelines, but releases could be as low as 

7.00 maf consistent with the Interim Guidelines and to protect Lake Powell from declining below elevation 3,525 feet at the end of December 2023. Balancing

releases in WY 2023 are based on the projected end of water year physical contents of Lake Powell and Lake Mead. 

Consistent with this operating approach and based on the most probable inflow forecast, the August 2023 24-Month Study projects a balancing release of 8.86 maf

from Lake Powell in WY 2023.The projected release from Lake Powell in WY 2023 will be updated each month throughout the remainder of the water year. The 

modeling approach for 2024 and beyond will be consistent with the Interim Guidelines and will be based on the projected physical contents at Lake Powell and 

Lake Mead. 

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 

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, Water Management Group

Upper Colorado Operations Office

Interior Region 7: Upper Colorado Basin

 Email: apivarnik@usbr.gov 
future protective measures for both Lakes Powell and Mead.

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 projects 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 WY 2024 will be the 

Mid-Elevation Release Tier and the water year release volume from Lake Powell will be 7.48 maf.

The August 2023 24-Month Study projects 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 July was 1.05 maf or 109 % of the 30-year average from 1991 to 2020. The August 2023 unregulated inflow forecast for 

Lake Powell is 0.43 maf or 114% of the 30-year average. The preliminary observed 2023 April through July unregulated inflow is 10.62 maf or 166 % of average.

In this study, the CY 2023 diversion for Metropolitan Water District of Southern California (MWD) is projected to be 0.75 maf. The CY 2023 diversion for the 

Central Arizona Project (CAP) is projected to be 0.81 maf. Consumptive use for Nevada above Hoover (SNWP Use) is projected to be 0.36 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 Cheri Woodward at (702) 

293-8101 or 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) Jul Inflow Forecast (kaf) Preliminary Observed

Apr May Jun Jul %Avg Aug Sep Oct Apr-Jul %Avg

Lake Powell 1399 4520 3646 1054 109% 430 430 540 10619 166%

Fontenelle 75 323 412 141 83% 65 45 45 951 129%

Flaming Gorge 188 521 574 174 86% 75 50 55 1457 151%

Blue Mesa 77 327 312 117 109% 57 40 40 833 131%

Morrow Point 85 364 331 121 107% 60 42 42 901 131%

Crystal 97 406 357 128 103% 65 46 47 988 128%

Taylor Park 7.1 39 50 22 118% 10 8 7.5 118 126%

Vallecito 36 119 75 22 89% 10 11 11 252 142%

Navajo 245 488 249 46 96% 20 23 35 1028 163%

Lemon 7.4 32 23.00 4.9 88% 2.5 2.5 2 67 140%

McPhee 147 249 108 23 118% 11 9 6.5 527 207%

Ridgway 10.5 30 40 27 119% 11 7.5 6.7 108 117%

Deerlodge 366 1043 515 76 88% 23 20 35 2000 168%

Durango 61 218 178 75 127% 30 25 23 532 138%

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_08_ucb.pdf. 

Information on the LC Conservation Program is available online at: 

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

August 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)

* Aug 2022 56 2 67 1 68 6502.43 306

H Sep 2022 29 2 61 0 61 6498.08 274

WY 2022 744 15 617 67 685

I Oct 2022 40 1 22 39 61 6494.58 249

S Nov 2022 33 1 10 48 58 6490.90 224

T Dec 2022 28 1 56 2 58 6486.14 194

O Jan 2023 32 1 58 0 59 6481.53 167

R Feb 2023 28 0 10 43 53 6476.59 141

I Mar 2023 29 0 55 3 58 6470.02 113

C Apr 2023 75 1 61 0 61 6473.29 126

A May 2023 323 1 102 95 198 6494.66 250

L Jun 2023 412 2 92 269 361 6501.41 299

* Jul 2023 141 3 86 41 127 6502.91 310

Aug 2023 65 2 74 0 74 6501.46 299

Sep 2023 45 2 71 0 71 6497.63 271

WY 2023 1251 15 697 541 1239

Oct 2023 45 1 68 0 68 6494.27 247

Nov 2023 45 1 65 0 65 6491.17 226

Dec 2023 35 1 68 0 68 6485.99 193

Jan 2024 32 1 68 0 68 6479.63 157

Feb 2024 30 0 63 0 63 6472.47 123

Mar 2024 48 0 68 0 68 6467.51 103

Apr 2024 75 1 34 18 53 6472.86 124

May 2024 150 1 94 0 94 6483.68 179

Jun 2024 295 2 103 87 190 6499.08 282

Jul 2024 170 3 102 35 137 6503.17 312

Aug 2024 65 2 92 0 92 6499.24 283

Sep 2024 40 2 71 0 71 6494.70 250

WY 2024 1030 14 896 140 1036

Oct 2024 46 1 0 55 55 6493.19 240

Nov 2024 42 1 0 61 61 6490.31 220

Dec 2024 32 1 20 48 68 6484.55 184

Jan 2025 31 1 68 0 68 6477.73 147

Feb 2025 29 0 61 0 61 6470.45 114

Mar 2025 51 0 56 0 56 6469.22 109

Apr 2025 77 1 38 9 46 6476.21 140

May 2025 166 1 92 0 92 6489.03 212

Jun 2025 301 2 104 118 222 6500.03 288

Jul 2025 146 3 102 21 123 6502.70 308

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3230 Processed On: 8/8/2023 2:26:54PM 
Most Probable Inflow*

August 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)

* Aug 2022 58 70 11 105 0 105 104 6014.73 2735 124

H Sep 2022 32 63 9 112 0 112 102 6013.01 2680 125

WY 2022 897 837 70 927 60 987 2138

I Oct 2022 41 65 6 111 0 111 100 6011.45 2630 142

S Nov 2022 40 63 3 102 0 102 98 6010.19 2590 132

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

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

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

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

C Apr 2023 188 181 4 48 0 48 98 6010.17 2589 404

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

L Jun 2023 574 512 10 114 42 157 125 6029.59 3249 673

* Jul 2023 174 166 13 75 1 76 128 6031.49 3323 168

Aug 2023 75 84 13 112 0 112 126 6030.48 3284 135

Sep 2023 50 76 11 113 0 113 124 6029.28 3238 133

WY 2023 1810 1801 75 1098 48 1146 3362

Oct 2023 55 78 7 99 0 99 123 6028.55 3210 134

Nov 2023 56 76 3 96 0 96 122 6027.94 3188 131

Dec 2023 39 72 2 117 0 117 120 6026.68 3143 149

Jan 2024 45 81 2 117 0 117 119 6025.66 3106 147

Feb 2024 49 82 2 109 0 109 118 6024.87 3078 139

Mar 2024 100 120 3 69 0 69 120 6026.16 3124 141

Apr 2024 125 103 5 67 0 67 121 6026.99 3154 307

May 2024 210 154 7 230 0 230 118 6024.73 3074 785

Jun 2024 390 285 10 64 0 64 126 6030.31 3277 464

Jul 2024 195 162 14 72 0 72 129 6032.18 3350 137

Aug 2024 70 97 13 109 0 109 128 6031.58 3326 127

Sep 2024 46 77 11 104 0 104 126 6030.62 3289 122

WY 2024 1380 1386 79 1254 0 1254 2784

Oct 2024 54 63 7 70 0 70 126 6030.26 3275 103

Nov 2024 51 70 4 81 0 81 125 6029.90 3261 115

Dec 2024 34 70 2 128 0 128 123 6028.37 3203 153

Jan 2025 42 79 2 128 0 128 121 6027.00 3154 153

Feb 2025 43 75 2 116 0 116 119 6025.84 3113 141

Mar 2025 85 90 3 61 0 61 120 6026.52 3137 135

Apr 2025 111 80 5 60 0 60 121 6026.96 3152 263

May 2025 239 165 7 196 0 196 119 6025.92 3115 709

Jun 2025 389 310 10 94 0 94 127 6031.25 3313 461

Jul 2025 161 138 14 75 0 75 129 6032.46 3361 135

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3230 Processed On: 8/8/2023 2:26:54PM 
Most Probable Inflow*

August 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)

* Aug 2022 8 14 9310.35 70

H Sep 2022 5 8 9308.87 68

WY 2022 110 100

I Oct 2022 6 6 9308.80 68

S Nov 2022 4 5 9308.13 67

T Dec 2022 5 5 9307.68 66

O Jan 2023 4 5 9307.08 65

R Feb 2023 4 5 9306.26 64

I Mar 2023 4 5 9305.50 63

C Apr 2023 7 9 9304.30 61

A May 2023 39 20 9316.35 80

L Jun 2023 50 28 9328.01 102

* Jul 2023 22 26 9326.25 99

Aug 2023 10 22 9320.15 87

Sep 2023 8 18 9314.55 77

WY 2023 163 154

Oct 2023 8 13 9311.78 73

Nov 2023 6 6 9311.82 73

Dec 2023 6 6 9311.72 73

Jan 2024 5 6 9311.01 72

Feb 2024 5 6 9310.67 71

Mar 2024 5 6 9309.95 70

Apr 2024 9 9 9309.95 70

May 2024 29 15 9318.26 84

Jun 2024 40 21 9328.32 103

Jul 2024 16 24 9324.22 95

Aug 2024 8 21 9317.13 82

Sep 2024 6 18 9309.95 70

WY 2024 143 151

Oct 2024 6 9 9308.04 67

Nov 2024 5 6 9307.42 66

Dec 2024 4 6 9306.00 64

Jan 2025 5 6 9305.23 63

Feb 2025 4 6 9304.17 61

Mar 2025 5 6 9303.37 60

Apr 2025 9 6 9305.43 63

May 2025 26 12 9314.26 77

Jun 2025 40 18 9326.32 99

Jul 2025 15 21 9323.19 93

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3230 Processed On: 8/8/2023 2:26:54PM 
Most Probable Inflow*

August 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)

* Aug 2022 57 64 1 89 0 89 7455.69 341

H Sep 2022 31 33 1 55 28 82 7446.72 292

WY 2022 661 652 6 566 28 595

I Oct 2022 32 32 0 0 58 58 7441.74 266

S Nov 2022 26 27 0 1 10 11 7444.87 282

T Dec 2022 24 25 0 6 10 17 7446.44 290

O Jan 2023 24 25 0 20 0 20 7447.43 295

R Feb 2023 20 21 0 20 0 20 7447.61 296

I Mar 2023 25 26 0 19 0 19 7448.79 303

C Apr 2023 77 79 1 23 0 23 7458.56 358

A May 2023 327 309 1 77 0 77 7491.44 589

L Jun 2023 312 290 1 106 6 131 7510.36 747

* Jul 2023 117 120 1 125 1 126 7509.50 739

Aug 2023 57 69 1 99 0 99 7505.82 707

Sep 2023 40 50 1 27 68 95 7500.34 661

WY 2023 1083 1073 8 524 153 696

Oct 2023 40 45 1 71 0 71 7497.04 634

Nov 2023 34 34 0 40 0 40 7496.30 628

Dec 2023 29 29 0 61 0 61 7492.34 596

Jan 2024 26 27 0 42 0 42 7490.41 581

Feb 2024 23 24 0 40 0 40 7488.26 564

Mar 2024 36 37 0 43 0 43 7487.45 558

Apr 2024 70 70 1 61 0 61 7488.48 566

May 2024 205 191 1 204 14 218 7484.81 538

Jun 2024 250 231 1 49 0 49 7507.08 718

Jul 2024 95 103 2 87 0 87 7508.79 733

Aug 2024 53 66 1 94 0 94 7505.45 704

Sep 2024 34 46 1 89 0 89 7500.21 660

WY 2024 895 903 9 881 14 895

Oct 2024 35 38 1 65 0 65 7496.84 632

Nov 2024 31 32 0 37 0 37 7496.18 627

Dec 2024 26 28 0 68 0 68 7491.19 587

Jan 2025 25 26 0 49 0 49 7488.20 564

Feb 2025 23 25 0 44 0 44 7485.63 544

Mar 2025 38 39 0 40 0 40 7485.48 543

Apr 2025 78 75 1 54 0 54 7488.08 563

May 2025 204 190 1 204 28 232 7482.39 520

Jun 2025 251 229 1 63 0 63 7503.10 684

Jul 2025 86 92 1 84 0 84 7503.93 691

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3230 Processed On: 8/8/2023 2:26:54PM 
Most Probable Inflow*

August 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)

* Aug 2022 58 89 1 90 90 0 90 7152.25 111

H Sep 2022 31 82 1 83 78 0 78 7157.81 115

WY 2022 685 595 24 619 614 0 614

I Oct 2022 33 58 1 59 60 0 60 7156.10 114

S Nov 2022 27 11 1 12 21 0 21 7143.98 104

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

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

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

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

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

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

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

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

Aug 2023 60 99 3 102 101 0 101 7153.73 112

Sep 2023 42 95 2 97 97 0 97 7153.73 112

WY 2023 1163 696 80 776 770 2 778

Oct 2023 42 71 2 73 73 0 73 7153.73 112

Nov 2023 36 40 2 42 42 0 42 7153.73 112

Dec 2023 31 61 2 63 63 0 63 7153.73 112

Jan 2024 28 42 2 44 44 0 44 7153.73 112

Feb 2024 26 40 3 43 43 0 43 7153.73 112

Mar 2024 40 43 4 47 47 0 47 7153.73 112

Apr 2024 80 61 10 71 71 0 71 7153.73 112

May 2024 230 218 25 243 243 0 243 7153.73 112

Jun 2024 270 49 20 69 69 0 69 7153.72 112

Jul 2024 100 87 5 92 92 0 92 7153.73 112

Aug 2024 56 94 3 97 96 0 96 7153.73 112

Sep 2024 36 89 2 91 91 0 91 7153.73 112

WY 2024 975 895 80 975 974 0 974

Oct 2024 37 65 2 67 67 0 67 7153.73 112

Nov 2024 32 37 1 38 38 0 38 7153.73 112

Dec 2024 27 68 1 69 69 0 69 7153.73 112

Jan 2025 26 49 1 50 50 0 50 7153.73 112

Feb 2025 25 44 2 46 46 0 46 7153.73 112

Mar 2025 40 40 2 42 42 0 42 7153.73 112

Apr 2025 89 54 11 65 65 0 65 7153.73 112

May 2025 226 232 22 254 254 0 254 7153.73 112

Jun 2025 265 63 14 77 77 0 77 7153.72 112

Jul 2025 90 84 4 88 87 0 87 7153.73 112

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3230 Processed On: 8/8/2023 2:26:54PM 
Most Probable Inflow*

August 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)

* Aug 2022 62 90 4 94 92 0 93 6751.52 17 66 31

H Sep 2022 33 78 2 80 69 12 80 6750.17 16 62 22

WY 2022 755 614 70 684 622 62 684 393 295

I Oct 2022 36 60 3 63 53 10 63 6751.29 16 41 21

S Nov 2022 29 21 2 23 21 2 23 6752.92 17 0 21

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

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

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

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

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

A May 2023 406 112 42 154 108 41 155 6751.26 16 48 111

L Jun 2023 357 149 26 176 119 34 174 6757.16 18 63 123

* Jul 2023 128 130 7 137 117 20 138 6752.61 17 67 76

Aug 2023 65 101 5 106 106 0 106 6753.04 17 65 41

Sep 2023 46 97 4 101 101 0 101 6753.04 17 55 46

WY 2023 1273 778 110 889 693 166 887 364 544

Oct 2023 47 73 5 78 52 26 78 6753.04 17 55 23

Nov 2023 41 42 5 47 47 0 47 6753.04 17 0 47

Dec 2023 36 63 5 68 68 0 68 6753.04 17 0 68

Jan 2024 33 44 5 49 49 0 49 6753.04 17 0 49

Feb 2024 29 43 3 46 46 0 46 6753.04 17 0 46

Mar 2024 47 47 7 54 54 0 54 6753.04 17 5 49

Apr 2024 91 71 11 82 82 0 82 6753.04 17 42 40

May 2024 265 243 35 278 134 144 278 6753.04 17 62 216

Jun 2024 305 69 35 104 104 0 104 6753.03 17 61 43

Jul 2024 110 92 10 102 101 0 101 6753.04 17 65 36

Aug 2024 61 96 5 101 101 0 101 6753.04 17 65 36

Sep 2024 40 91 4 95 95 0 95 6753.04 17 55 40

WY 2024 1105 974 130 1104 934 170 1104 410 694

Oct 2024 42 67 5 72 56 16 72 6753.04 17 55 17

Nov 2024 36 38 4 42 42 0 42 6753.04 17 0 42

Dec 2024 32 69 5 74 74 0 74 6753.04 17 0 74

Jan 2025 31 50 5 55 55 0 55 6753.04 17 0 55

Feb 2025 29 46 4 50 50 0 50 6753.04 17 0 50

Mar 2025 46 42 6 48 48 0 48 6753.04 17 5 43

Apr 2025 100 65 11 76 76 0 76 6753.04 17 42 34

May 2025 251 254 25 279 134 145 279 6753.04 17 62 217

Jun 2025 293 77 28 105 105 0 105 6753.03 17 61 44

Jul 2025 98 87 8 95 95 0 95 6753.04 17 65 30

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3230 Processed On: 8/8/2023 2:26:54PM 
Most Probable Inflow*

August 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)

* Aug 2022 18 28 7637.64 59

H Sep 2022 12 26 7630.15 45

WY 2022 185 160

I Oct 2022 14 3 7635.84 56

S Nov 2022 7 0 7639.00 62

T Dec 2022 5 0 7641.15 67

O Jan 2023 5 0 7643.44 72

R Feb 2023 5 2 7644.74 75

I Mar 2023 7 36 7630.44 46

C Apr 2023 36 45 7625.05 36

A May 2023 119 64 7651.55 91

L Jun 2023 75 41 7664.54 124

* Jul 2023 22 37 7658.55 108

Aug 2023 10 37 7647.44 81

Sep 2023 11 30 7638.90 62

WY 2023 316 296

Oct 2023 11 17 7635.77 56

Nov 2023 8 2 7638.77 62

Dec 2023 7 2 7641.17 67

Jan 2024 6 2 7643.04 71

Feb 2024 5 2 7644.46 74

Mar 2024 8 2 7647.06 80

Apr 2024 20 2 7654.46 98

May 2024 66 40 7664.45 124

Jun 2024 64 65 7664.03 123

Jul 2024 18 41 7654.80 99

Aug 2024 12 38 7643.83 73

Sep 2024 11 29 7635.00 54

WY 2024 236 240

Oct 2024 10 16 7631.50 48

Nov 2024 8 2 7634.75 54

Dec 2024 7 2 7637.31 59

Jan 2025 6 2 7639.28 63

Feb 2025 5 2 7640.81 66

Mar 2025 10 2 7644.43 74

Apr 2025 23 2 7653.25 95

May 2025 68 42 7662.97 120

Jun 2025 62 62 7662.61 119

Jul 2025 21 42 7654.43 98

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3230 Processed On: 8/8/2023 2:26:54PM 
Most Probable Inflow*

August 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)

* Aug 2022 53 5 56 3 38 30 6023.95 902 49

H Sep 2022 22 1 35 2 23 40 6020.65 872 56

WY 2022 574 66 484 20 200 296 595

I Oct 2022 44 2 32 1 5 33 6019.84 865 51

S Nov 2022 23 0 16 1 0 19 6019.52 862 37

T Dec 2022 17 0 13 0 0 22 6018.45 852 37

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

R Feb 2023 18 0 15 1 1 17 6017.38 843 31

I Mar 2023 71 0 98 1 3 18 6025.86 920 45

C Apr 2023 245 24 235 2 8 21 6045.83 1124 109

A May 2023 488 59 376 3 28 128 6063.70 1340 345

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

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

Aug 2023 20 1 46 3 44 34 6054.61 1226 64

Sep 2023 23 0 41 3 24 30 6053.31 1210 55

WY 2023 1264 145 1099 25 196 540 1231

Oct 2023 35 2 40 2 9 19 6054.16 1220 42

Nov 2023 33 1 26 1 0 18 6054.72 1227 36

Dec 2023 28 0 22 1 0 18 6055.00 1230 33

Jan 2024 25 0 21 1 0 18 6055.12 1232 32

Feb 2024 29 1 25 1 0 17 6055.67 1239 30

Mar 2024 65 6 53 2 6 18 6057.88 1266 38

Apr 2024 133 16 98 2 21 18 6062.35 1323 65

May 2024 235 32 177 4 36 18 6071.17 1442 154

Jun 2024 180 23 157 5 52 18 6076.92 1524 153

Jul 2024 29 2 51 5 55 29 6074.28 1486 79

Aug 2024 25 2 49 4 46 32 6071.94 1453 62

Sep 2024 28 1 45 3 25 140 6062.91 1330 164

WY 2024 845 86 763 29 250 364 889

Oct 2024 33 2 38 2 9 19 6063.59 1339 41

Nov 2024 29 1 22 1 0 18 6063.82 1342 36

Dec 2024 24 0 19 1 0 18 6063.79 1341 33

Jan 2025 22 0 18 1 0 18 6063.69 1340 31

Feb 2025 29 1 25 1 0 17 6064.22 1347 29

Mar 2025 92 10 74 2 5 18 6067.83 1395 41

Apr 2025 147 18 107 3 21 18 6072.57 1461 69

May 2025 251 34 191 4 35 229 6067.02 1384 364

Jun 2025 187 25 163 4 51 232 6057.42 1260 376

Jul 2025 33 2 51 4 55 29 6054.36 1223 80

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3230 Processed On: 8/8/2023 2:26:54PM 
Most Probable Inflow*

August 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)

* Aug 2022 368 444 27 713 0 713 3531.69 4529 5938 722

H Sep 2022 245 420 24 547 0 547 3529.33 4517 5797 562

WY 2022 6084 6107 203 6999 0 6999 7066

I Oct 2022 437 535 17 480 0 480 3529.92 4520 5832 494

S Nov 2022 349 394 17 498 0 498 3528.02 4511 5720 507

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

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

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

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

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

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

L Jun 2023 3646 2916 31 1064 0 1064 3583.47 4820 9574 1083

* Jul 2023 1054 923 40 1149 0 1149 3580.42 4800 9328 1168

Aug 2023 430 566 39 900 0 900 3576.06 4772 8983 914

Sep 2023 430 580 35 753 0 753 3573.56 4757 8790 769

WY 2023 13750 12321 231 8768 90 8858 9035

Oct 2023 540 610 24 480 0 480 3574.83 4765 8887 496

Nov 2023 515 547 24 500 0 500 3575.10 4766 8909 505

Dec 2023 400 500 19 600 0 600 3573.68 4758 8799 603

Jan 2024 380 462 6 723 0 723 3570.44 4738 8552 727

Feb 2024 430 497 6 639 0 639 3568.62 4727 8414 650

Mar 2024 600 541 10 675 0 675 3566.83 4716 8281 689

Apr 2024 950 806 16 601 0 601 3569.18 4730 8456 618

May 2024 2200 2084 20 599 0 599 3586.37 4839 9812 620

Jun 2024 2400 1786 36 628 0 628 3598.44 4922 10851 645

Jul 2024 870 795 46 709 0 709 3598.86 4925 10889 724

Aug 2024 365 499 45 758 0 758 3595.68 4902 10607 772

Sep 2024 350 601 42 568 0 568 3595.59 4902 10599 584

WY 2024 10000 9728 294 7480 0 7480 7633

Oct 2024 447 489 29 643 0 643 3593.66 4888 10430 659

Nov 2024 466 492 27 642 0 642 3591.75 4875 10266 647

Dec 2024 361 492 22 715 0 715 3589.09 4857 10039 718

Jan 2025 350 457 6 857 0 857 3584.55 4827 9663 861

Feb 2025 397 480 7 752 6 758 3581.31 4806 9399 769

Mar 2025 614 534 11 801 0 801 3578.08 4785 9142 815

Apr 2025 920 755 17 713 0 713 3578.36 4787 9164 730

May 2025 2060 2093 22 710 0 710 3593.59 4888 10424 731

Jun 2025 2423 2061 39 745 0 745 3606.70 4982 11607 762

Jul 2025 711 676 48 842 0 842 3604.57 4966 11408 857

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3230 Processed On: 8/8/2023 2:26:54PM 
Most Probable Inflow*

August 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)

* Aug 2022 713 183 48 573 9.3 25 567 473 1044.28 7275

H Sep 2022 547 117 48 539 9.1 21 545 476 1045.03 7328

WY 2022 6999 787 463 8899 222 8888

I Oct 2022 480 94 46 418 6.8 16 434 482 1046.28 7417

S Nov 2022 498 18 40 713 12.0 8 714 467 1043.02 7187

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

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

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

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

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

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

L Jun 2023 1064 61 50 886 14.9 23 875 530 1056.39 8152

* Jul 2023 1149 61 48 760 12.4 30 759 553 1061.02 8501

Aug 2023 900 86 53 678 11.0 70 678 564 1063.28 8674

Sep 2023 753 72 52 591 9.9 58 591 571 1064.78 8790

WY 2023 8858 1258 457 7829 274 7745

Oct 2023 480 77 50 554 9.0 46 554 566 1063.66 8703

Nov 2023 500 63 43 612 10.3 35 612 558 1062.11 8584

Dec 2023 600 72 35 343 5.6 34 343 574 1065.27 8828

Jan 2024 723 75 25 552 9.0 11 552 587 1067.80 9026

Feb 2024 639 71 23 537 9.3 8 537 595 1069.49 9159

Mar 2024 675 97 25 881 14.3 14 881 586 1067.73 9020

Apr 2024 601 60 34 1006 16.9 16 1006 562 1062.97 8650

May 2024 599 37 41 986 16.0 20 986 537 1057.88 8263

Jun 2024 628 22 50 895 15.0 28 895 517 1053.80 7960

Jul 2024 709 55 47 789 12.8 32 789 511 1052.47 7862

Aug 2024 758 86 51 751 12.2 34 751 512 1052.57 7870

Sep 2024 568 72 50 650 10.9 30 650 506 1051.42 7786

WY 2024 7480 786 474 8553 308 8553

Oct 2024 643 77 47 462 7.5 24 462 517 1053.82 7961

Nov 2024 642 63 42 588 9.9 14 588 521 1054.60 8019

Dec 2024 715 72 34 520 8.5 9 520 535 1057.43 8229

Jan 2025 857 75 24 570 9.3 10 570 555 1061.51 8538

Feb 2025 758 71 22 541 9.7 7 541 571 1064.66 8780

Mar 2025 801 97 25 885 14.4 13 885 569 1064.35 8757

Apr 2025 713 60 33 1010 17.0 15 1010 552 1060.87 8489

May 2025 710 37 41 990 16.1 19 990 533 1057.09 8204

Jun 2025 745 22 50 899 15.1 26 899 521 1054.46 8009

Jul 2025 842 55 48 793 12.9 30 793 522 1054.80 8033

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3230 Processed On: 8/8/2023 2:26:54PM 
Most Probable Inflow*

August 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)

* Aug 2022 573 -13 16 575 0 575 9.3 642.87 1695

H Sep 2022 539 -6 16 617 0 617 10.4 639.17 1595

WY 2022 8899 -222 151 8495 0 8495

I Oct 2022 418 -2 14 540 0 542 8.8 633.78 1454

S Nov 2022 713 -15 13 516 0 516 8.7 640.22 1623

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

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

R Feb 2023 494 -18 8 429 0 444 8.0 643.00 1699

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

C Apr 2023 831 -10 13 844 0 844 14.2 642.84 1694

A May 2023 855 -10 14 833 0 859 14.0 641.83 1667

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

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

Aug 2023 678 -17 16 668 0 668 10.9 642.25 1678

Sep 2023 591 -6 16 656 0 656 11.0 639.01 1591

WY 2023 7829 -109 151 7529 0 7573

Oct 2023 554 -11 14 607 0 607 9.9 636.00 1512

Nov 2023 612 -16 13 477 0 477 8.0 640.01 1618

Dec 2023 343 -2 13 329 0 329 5.3 640.01 1617

Jan 2024 552 -11 9 484 0 484 7.9 641.80 1666

Feb 2024 537 -13 8 516 0 516 9.0 641.80 1666

Mar 2024 881 -10 10 826 0 826 13.4 643.05 1700

Apr 2024 1006 -14 13 981 0 981 16.5 643.00 1699

May 2024 986 -13 14 959 0 959 15.6 643.00 1699

Jun 2024 895 -21 14 860 0 860 14.5 643.00 1699

Jul 2024 789 -21 12 782 0 782 12.7 642.00 1671

Aug 2024 751 -17 15 719 0 719 11.7 642.00 1671

Sep 2024 650 -6 16 681 0 681 11.4 640.01 1617

WY 2024 8553 -154 151 8221 0 8221

Oct 2024 462 -11 14 620 0 620 10.1 633.00 1434

Nov 2024 588 -16 13 508 0 508 8.5 635.00 1486

Dec 2024 520 -2 13 387 0 387 6.3 639.51 1604

Jan 2025 570 -11 9 488 0 488 7.9 641.80 1666

Feb 2025 541 -13 8 520 0 520 9.4 641.80 1666

Mar 2025 885 -10 10 830 0 830 13.5 643.05 1700

Apr 2025 1010 -14 13 985 0 985 16.6 643.00 1699

May 2025 990 -13 14 963 0 963 15.7 643.00 1699

Jun 2025 899 -21 14 864 0 864 14.5 643.00 1699

Jul 2025 793 -21 12 787 0 787 12.8 642.00 1671

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3230 Processed On: 8/8/2023 2:26:54PM 
Most Probable Inflow*

August 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)

* Aug 2022 575 40 17 482 7.8 106 16 448.16 583 120 2.0

H Sep 2022 617 15 15 458 7.7 103 52 447.96 579 108 1.8

WY 2022 8495 176 140 6231 1117 1112 1499

I Oct 2022 542 26 12 393 6.4 106 66 447.14 564 67 1.1

S Nov 2022 516 1 9 336 5.6 103 67 447.09 563 89 1.5

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

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

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

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

C Apr 2023 844 50 11 669 11.2 49 169 447.68 574 153 2.6

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

L Jun 2023 819 18 15 636 10.7 70 69 448.25 585 130 2.2

* Jul 2023 736 19 17 634 10.3 70 22 448.36 587 131 2.1

Aug 2023 668 19 17 580 9.4 71 24 447.50 571 105 1.7

Sep 2023 656 12 15 529 8.9 68 45 447.50 570 91 1.5

WY 2023 7573 245 139 5892 852 862 1411

Oct 2023 607 21 12 462 7.5 71 75 447.50 571 68 1.1

Nov 2023 477 14 9 363 6.1 69 45 447.50 570 84 1.4

Dec 2023 329 17 7 261 4.2 71 21 446.50 552 84 1.4

Jan 2024 484 7 6 313 5.1 86 79 446.50 552 138 2.2

Feb 2024 516 4 8 411 7.1 8 87 446.50 552 124 2.2

Mar 2024 826 2 9 608 9.9 98 100 446.70 555 147 2.4

Apr 2024 981 7 11 727 12.2 89 113 448.70 593 147 2.5

May 2024 959 4 13 734 11.9 85 119 448.70 593 110 1.8

Jun 2024 860 10 16 714 12.0 82 47 448.70 593 116 2.0

Jul 2024 782 17 17 686 11.2 85 13 448.00 580 123 2.0

Aug 2024 719 19 17 621 10.1 85 14 447.50 571 102 1.7

Sep 2024 681 12 15 533 9.0 82 53 447.50 570 99 1.7

WY 2024 8221 134 139 6431 910 767 1342

Oct 2024 620 21 12 482 7.8 85 55 447.50 571 89 1.4

Nov 2024 508 14 9 375 6.3 82 50 447.50 570 115 1.9

Dec 2024 387 17 7 270 4.4 85 57 446.50 552 110 1.8

Jan 2025 488 7 6 313 5.1 90 79 446.50 552 138 2.2

Feb 2025 520 4 8 411 7.4 12 87 446.50 552 124 2.2

Mar 2025 830 2 9 608 9.9 102 100 446.70 555 147 2.4

Apr 2025 985 7 11 726 12.2 93 113 448.70 593 147 2.5

May 2025 963 4 13 733 11.9 89 119 448.70 593 110 1.8

Jun 2025 864 10 16 714 12.0 86 47 448.70 593 116 2.0

Jul 2025 787 17 17 686 11.2 89 14 448.00 580 123 2.0

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3230 Processed On: 8/8/2023 2:26:54PM 
Most Probable Inflow*

August 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

* Aug 2022 573 9.3 1044.28 7275 234 399.70 1224.8 200.6 94 349.9

H Sep 2022 539 9.1 1045.03 7328 53 400.65 1157.3 188.5 88 349.7

WY 2022 8899 3240.9

I Oct 2022 418 6.8 1046.28 7417 88 402.36 924.5 145.8 70 348.8

S Nov 2022 713 12.0 1043.02 7187 -230 395.39 948.8 254.6 72 357.1

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

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

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

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

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

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

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

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

Aug 2023 678 11.0 1063.28 8674 173 410.07 1308.1 246.9 90 364.2

Sep 2023 591 9.9 1064.78 8790 116 414.41 1160.0 219.1 79 370.7

WY 2023 7829 2830.7

Oct 2023 554 9.0 1063.66 8703 -87 418.41 916.0 206.2 63 372.5

Nov 2023 612 10.3 1062.11 8584 -119 416.75 916.0 231.0 63 377.4

Dec 2023 343 5.6 1065.27 8828 244 415.01 1098.0 122.6 74 357.3

Jan 2024 552 9.0 1067.80 9026 198 417.82 1020.0 204.5 69 370.6

Feb 2024 537 9.3 1069.49 9159 134 419.33 1027.0 200.5 69 373.8

Mar 2024 881 14.3 1067.73 9020 -139 417.57 1203.0 337.6 81 383.4

Apr 2024 1006 16.9 1062.97 8650 -370 411.99 1446.0 370.6 100 368.6

May 2024 986 16.0 1057.88 8263 -387 407.14 1418.0 356.0 100 361.1

Jun 2024 895 15.0 1053.80 7960 -303 402.60 1390.0 322.6 100 360.6

Jul 2024 789 12.8 1052.47 7862 -98 400.25 1399.4 283.9 100 360.0

Aug 2024 751 12.2 1052.57 7870 8 399.96 1399.4 268.7 100 357.9

Sep 2024 650 10.9 1051.42 7786 -84 400.09 1386.6 229.7 100 353.6

WY 2024 8553 3134.1

Oct 2024 462 7.5 1053.82 7961 175 407.20 830.0 169.5 60 366.6

Nov 2024 588 9.9 1054.60 8019 58 411.06 830.0 218.4 60 371.2

Dec 2024 520 8.5 1057.43 8229 210 410.38 886.5 194.1 63 373.2

Jan 2025 570 9.3 1061.51 8538 308 410.86 1010.5 208.5 70 366.0

Feb 2025 541 9.7 1064.66 8780 242 413.70 1026.4 200.5 70 370.7

Mar 2025 885 14.4 1064.35 8757 -24 412.95 1266.9 334.7 87 378.2

Apr 2025 1010 17.0 1060.87 8489 -267 410.65 1250.1 374.0 87 370.4

May 2025 990 16.1 1057.09 8204 -285 407.04 1231.2 360.4 87 364.0

Jun 2025 899 15.1 1054.46 8009 -195 403.89 1212.1 327.4 87 364.2

Jul 2025 793 12.9 1054.80 8033 25 401.73 1395.6 286.7 100 361.6

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3230 Processed On: 8/8/2023 2:26:54PM 
Most Probable Inflow*

August 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

* Aug 2022 575 9.3 642.87 1695 -30 141.93 253.3 74.7 99 129.9

H Sep 2022 617 10.4 639.17 1595 -100 137.50 248.2 78.5 97 127.3

WY 2022 8495 1074.5

I Oct 2022 540 8.8 633.78 1454 -141 134.35 185.9 66.9 73 123.8

S Nov 2022 516 8.7 640.22 1623 169 141.13 154.7 62.5 61 121.1

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

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

R Feb 2023 429 8.0 643.00 1699 24 141.81 185.8 56.7 73 132.3

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

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

A May 2023 833 14.0 641.83 1667 -28 137.48 255.0 109.4 100 131.4

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

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

Aug 2023 668 10.9 642.25 1678 -22 140.45 255.0 84.5 100 126.5

Sep 2023 656 11.0 639.01 1591 -87 138.36 255.0 81.7 100 124.7

WY 2023 7529 959.5

Oct 2023 607 9.9 636.00 1512 -79 135.70 184.3 74.3 72 122.3

Nov 2023 477 8.0 640.01 1618 106 136.99 159.8 58.9 63 123.4

Dec 2023 329 5.3 640.01 1617 0 140.24 154.7 41.5 61 126.3

Jan 2024 484 7.9 641.80 1666 49 139.97 156.3 61.0 61 126.1

Feb 2024 516 9.0 641.80 1666 0 140.38 158.3 65.3 62 126.5

Mar 2024 826 13.4 643.05 1700 34 139.24 194.1 103.6 76 125.4

Apr 2024 981 16.5 643.00 1699 -2 138.77 249.9 122.6 98 125.0

May 2024 959 15.6 643.00 1699 0 139.04 255.0 120.1 100 125.3

Jun 2024 860 14.5 643.00 1699 0 139.44 255.0 108.0 100 125.6

Jul 2024 782 12.7 642.00 1671 -27 139.57 255.0 98.4 100 125.7

Aug 2024 719 11.7 642.00 1671 0 139.47 255.0 90.3 100 125.7

Sep 2024 681 11.4 640.01 1617 -54 138.56 255.0 85.0 100 124.8

WY 2024 8221 1029.0

Oct 2024 620 10.1 633.00 1434 -183 134.62 227.0 75.2 89 121.3

Nov 2024 508 8.5 635.00 1486 51 132.76 159.8 60.8 63 119.6

Dec 2024 387 6.3 639.51 1604 118 137.03 154.7 47.8 61 123.5

Jan 2025 488 7.9 641.80 1666 62 139.68 156.3 61.4 61 125.8

Feb 2025 520 9.4 641.80 1666 0 140.21 156.6 65.7 61 126.3

Mar 2025 830 13.5 643.05 1700 34 139.22 194.1 104.1 76 125.4

Apr 2025 985 16.6 643.00 1699 -2 138.75 249.9 123.1 98 125.0

May 2025 963 15.7 643.00 1699 0 139.02 255.0 120.6 100 125.2

Jun 2025 864 14.5 643.00 1699 0 139.42 255.0 108.5 100 125.6

Jul 2025 787 12.8 642.00 1671 -27 139.55 255.0 98.9 100 125.7

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3230 Processed On: 8/8/2023 2:26:54PM 
Most Probable Inflow*

August 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

* Aug 2022 482 7.8 448.16 583 -13 83.58 120.0 33.4 100 69.3

H Sep 2022 458 7.7 447.96 579 -4 81.26 120.0 31.4 100 68.7

WY 2022 6231 431.0

I Oct 2022 393 6.4 447.14 564 -15 81.28 91.9 27.2 77 69.1

S Nov 2022 336 5.6 447.09 563 -1 82.54 82.0 22.8 68 68.0

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

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

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

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

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

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

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

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

Aug 2023 580 9.4 447.50 571 -16 79.06 120.0 40.5 100 69.9

Sep 2023 529 8.9 447.50 570 0 78.86 120.0 36.7 100 69.3

WY 2023 5879 406.8

Oct 2023 462 7.5 447.50 571 0 79.49 91.0 32.4 76 70.3

Nov 2023 363 6.1 447.50 570 0 80.18 92.0 24.9 77 68.7

Dec 2023 261 4.2 446.50 552 -19 80.67 112.3 16.6 94 63.7

Jan 2024 313 5.1 446.50 552 0 79.71 92.9 20.9 77 66.8

Feb 2024 411 7.1 446.50 552 0 78.66 96.2 28.4 80 69.1

Mar 2024 608 9.9 446.70 555 4 77.53 120.0 41.7 100 68.6

Apr 2024 727 12.2 448.70 593 38 77.71 120.0 50.5 100 69.5

May 2024 734 11.9 448.70 593 0 78.82 120.0 51.5 100 70.2

Jun 2024 714 12.0 448.70 593 0 78.79 120.0 50.1 100 70.2

Jul 2024 686 11.2 448.00 580 -13 78.77 120.0 47.9 100 69.8

Aug 2024 621 10.1 447.50 571 -10 78.59 120.0 43.1 100 69.4

Sep 2024 533 9.0 447.50 570 0 78.83 120.0 36.9 100 69.3

WY 2024 6431 445.1

Oct 2024 482 7.8 447.50 571 0 79.34 90.0 33.8 75 70.1

Nov 2024 375 6.3 447.50 570 0 80.08 92.0 25.7 77 68.6

Dec 2024 270 4.4 446.50 552 -19 80.59 114.2 17.2 95 63.6

Jan 2025 313 5.1 446.50 552 0 79.71 92.9 20.9 77 66.8

Feb 2025 411 7.4 446.50 552 0 78.54 95.4 28.4 79 69.0

Mar 2025 608 9.9 446.70 555 4 77.53 120.0 41.7 100 68.6

Apr 2025 726 12.2 448.70 593 38 77.71 120.0 50.5 100 69.5

May 2025 733 11.9 448.70 593 0 78.82 120.0 51.5 100 70.2

Jun 2025 714 12.0 448.70 593 0 78.79 120.0 50.1 100 70.2

Jul 2025 686 11.2 448.00 580 -13 78.77 120.0 47.9 100 69.8

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3230 Processed On: 8/8/2023 2:26:54PM 
Most Probable Inflow*

August 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 

* Aug 2022 265 39 23 31 18 6

H Sep 2022 201 42 14 27 13 5

Summer 2022 1332 222 108 160 92 28

I Oct 2022 175 42 0 21 10 2

S Nov 2022 181 38 0 6 2 1

T Dec 2022 199 40 1 6 2 4

O Jan 2023 182 41 4 5 2 4

R Feb 2023 172 37 5 6 0 1

I Mar 2023 173 23 4 6 0 3

Winter 2023 1083 220 15 49 16 15

C Apr 2023 291 17 5 9 3 4

A May 2023 412 18 21 40 20 7

L Jun 2023 439 43 32 50 22 8

* Jul 2023 483 29 38 45 22 8

Aug 2023 358 38 31 36 18 6

Sep 2023 298 38 8 35 17 5

Summer 2023 2282 183 135 215 104 37

Oct 2023 190 34 22 26 9 5

Nov 2023 198 32 12 15 8 5

Dec 2023 237 39 18 23 12 5

Jan 2024 284 39 12 16 9 4

Feb 2024 250 37 12 16 8 4

Mar 2024 263 23 13 17 9 4

Winter 2024 1421 205 89 113 55 26

Apr 2024 234 23 18 26 14 2

May 2024 238 77 60 88 23 6

Jun 2024 257 21 15 25 18 7

Jul 2024 294 24 27 33 18 8

Aug 2024 314 37 29 35 18 7

Sep 2024 234 35 27 33 16 5

Summer 2024 1571 218 175 239 107 35

Oct 2024 264 24 20 24 10 0

Nov 2024 264 27 11 14 7 0

Dec 2024 292 43 20 25 13 1

Jan 2025 348 43 15 18 10 4

Feb 2025 303 39 13 17 9 3

Mar 2025 321 21 12 15 8 3

Winter 2025 1792 198 90 112 56 12

Apr 2025 285 20 16 24 13 2

May 2025 288 66 59 92 23 6

Jun 2025 312 32 19 28 18 7

Jul 2025 357 25 25 31 16 8

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3230 Processed On: 8/8/2023 2:26:54PM
Most Probable Inflow*

August 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 * * * *

Aug 2023 378 86 387 13986 14837 19119 33956 378 86 387 851 13986 19119 33956 1500 678 0 25.6

Sep 2023 428 117 422 14331 15299 18946 34245 428 117 422 968 14331 18946 34245 2270 591 0 25.3

Oct 2023 502 164 438 14524 15628 18830 34458 502 164 438 1104 14524 18830 34458 3040 554 0 25.2

Nov 2023 554 191 428 14427 15599 18917 34516 554 191 428 1172 14427 18917 34516 3810 612 0 25.2

Dec 2023 597 197 421 14405 15620 19036 34656 597 197 421 1215 14405 19036 34656 4580 343 0 25.2

Jan 2024 675 229 418 14515 15837 18792 34629 675 229 418 1321 14515 18792 34629 5350 552 0 25.1

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

Jan 2024 675 229 418 14515 15837 18792 34629 385 164 418 967 14515 18792 34274 5350 552 0 25.1

Feb 2024 748 244 416 14762 16170 18594 34764 457 181 416 1054 14762 18594 34410 1500 537 0 25.0

Mar 2024 810 261 409 14899 16379 18461 34840 517 198 409 1124 14899 18461 34485 1500 881 0 24.8

Apr 2024 784 267 382 15032 16465 18600 35065 487 205 382 1074 15032 18600 34706 1500 1006 0 24.8

May 2024 733 259 325 14857 16174 18970 35144 429 196 319 945 14857 18970 34772 1500 986 0 25.8

Jun 2024 758 287 206 13502 14753 19357 34110 449 209 161 819 13502 19357 33678 1500 895 0 27.1

Jul 2024 452 107 123 12463 13145 19660 32805 123 8 22 153 12463 19660 32276 1500 789 0 27.1

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

Aug 2024 349 92 162 12425 13028 19758 32786 349 92 162 603 12425 19758 32786 1500 751 0 26.7

Sep 2024 402 121 195 12707 13424 19750 33175 402 121 195 718 12707 19750 33175 2270 650 0 26.3

Oct 2024 472 165 318 12715 13669 19834 33503 472 165 318 954 12715 19834 33503 3040 462 0 26.1

Nov 2024 496 192 309 12883 13881 19659 33540 496 192 309 997 12883 19659 33540 3810 588 0 26.0

Dec 2024 529 198 306 13048 14081 19601 33682 529 198 306 1033 13048 19601 33682 4580 520 0 25.9

Jan 2025 624 238 306 13275 14443 19391 33833 624 238 306 1168 13275 19391 33833 5350 570 0 25.8

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

Jan 2025 624 238 306 13275 14443 19391 33833 340 139 68 546 13275 19391 33211 5350 570 0 25.8

Feb 2025 710 261 308 13651 14930 19082 34012 426 163 68 657 13651 19082 33390 1500 541 0 25.7

Mar 2025 784 281 301 13915 15280 18840 34120 499 184 60 743 13915 18840 33498 1500 885 0 25.5

Apr 2025 764 282 252 14172 15471 18863 34334 475 186 5 666 14172 18863 33702 1500 1010 0 25.5

May 2025 719 262 186 14150 15317 19131 34448 424 162 -84 501 14150 19131 33782 1500 990 0 26.4

Jun 2025 683 305 263 12890 14141 19416 33557 381 190 -47 525 12890 19416 32830 1500 899 0 27.7

Jul 2025 409 141 388 11707 12644 19611 32256 86 3 22 111 11707 19611 31429 1500 793 0 27.5

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3230 Processed On: 8/8/2023 2:26:54PM