Subject: July 2023 Most Probable 24-Month Study

The operation of Lake Powell and Lake Mead in the July 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. 

The August 2022 24-Month Study projected the January 1, 2023 Lake Powell elevation to be less than 3,525 feet. 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, in which the most probable inflow into Lake Powell was projected to be 11.30

maf (177 percent of average) during the 2023 April-July runoff period, Reclamation determined that conditions are 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 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. In addition, Reclamation has removed the operational neutrality of the 0.480 

maf that was retained in Lake Powell under the May 2022 action,1 such that balancing releases are based on the projected end of water year physical contents of 

Lake Powell and Lake Mead. Further, Lower Basin projections for Lake Mead take into consideration updated water orders to reflect additional conservation efforts

and new completed system conservation agreements under the Lower Colorado River Basin System Conservation and Efficiency Program (LC Conservation 

Program).

Consistent with this operating approach and based on the most probable inflow forecast, the July 2023 24-Month Study projects a balancing release of 9.04 maf 

from Lake Powell in WY 2023; however, the actual release in WY 2023 will range between 7.00 and 9.50 maf and will depend on actual hydrology and reservoir 

conditions at Lake Powell and Lake Mead during the remainder of the water year. 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, based on projected 

physical elevations at Lake Powell and Lake Mead, and assume the 0.480 maf retained in Lake Powell under the May 2022 action was released as part of the WY 

2023 balancing release only if the release volume is 7.48 maf or greater.

The 2022 Drought Response Operations Agreement (DROA) Plan2for 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 

1 For more information: https://www.usbr.gov/uc/DocLibrary/Plans/20220503-2022DROA-GlenCanyonDamOperationsDecisionLetter-508-DOI.pdf.

2 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
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.

The August 2022 24-Month Study projected the January 1, 2023 Lake Mead elevation, determined as if the 0.480 maf had been delivered to Lake Mead in WY

2022, to be below 1,050 feet and above 1,045 feet. Consistent with Section 2.D.1 of the Interim Guidelines, a Shortage Condition consistent with Section 2.D.1.b 

will govern 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 the LC Conservation Program will also take place in 

CY 2023.

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 June was 3.65 maf or 149 % of the 30-year average from 1991 to 2020. The July 2023 unregulated inflow forecast for 

Lake Powell is 1.24 maf or 128 % of the 30-year average. The 2023 April through July unregulated inflow forecast is 10.80 maf or 169 % of average.

In this study, the CY 2023 diversion for Metropolitan Water District of Southern California (MWD) is projected to be 0.81 maf. The CY 2023 diversion for the 

Central Arizona Project (CAP) is projected to be 0.79 maf. Consumptive use for Nevada above Hoover (SNWP Use) is projected to be 0.30 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) Jun Inflow Forecast (kaf)

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

Lake Powell 573 1399 4520 3646 149% 1235 500 430 10800 169%

Fontenelle 29 75 323 412 134% 155 60 45 965 131%

Flaming Gorge 49 188 521 572 146% 180 70 50 1460 151%

Blue Mesa 25 77 327 312 125% 129 63 40 845 133%

Morrow Point 26 85 364 331 124% 135 66 43 915 133%

Crystal 29 97 406 357 120% 150 71 48 1010 131%

Taylor Park 3.2 7.1 39 50 125% 24 11.5 8 120 128%

Vallecito 6.6 36 119 75 119% 27 14 12 257 145%

Navajo 71 245 488 249 131% 53 25 25 1035 164%

Lemon 0.97 7.4 32 23 129% 6.6 3.6 3 69 144%

McPhee 9.1 147 249 109 164% 28 14 11 533 209%

Ridgway 4.9 10.5 30 41 112% 28 12 7.5 110 120%

Deerlodge 32 366 1043 522 132% 79 25 20 2010 169%

Durango 11.2 61 218 179 126% 87 36 29 545 142%

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_07_ucb.pdf. 

Information on the LC Conservation Program is available online at: 

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

July 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)

* Jul 2022 102 3 83 11 93 6504.34 321

H Aug 2022 56 2 67 1 68 6502.43 306

I Sep 2022 29 2 61 0 61 6498.08 274

WY 2022 744 15 617 67 685

S Oct 2022 40 1 22 39 61 6494.58 249

T Nov 2022 33 1 10 48 58 6490.90 224

O Dec 2022 28 1 56 2 58 6486.14 194

R Jan 2023 32 1 58 0 59 6481.53 167

I Feb 2023 28 0 10 43 53 6476.59 141

C Mar 2023 29 0 55 3 58 6470.02 113

A Apr 2023 75 1 61 0 61 6473.29 126

L May 2023 323 1 102 95 198 6494.66 250

* Jun 2023 412 2 92 269 361 6501.41 299

Jul 2023 155 3 101 29 130 6504.38 321

Aug 2023 60 2 89 0 89 6500.24 290

Sep 2023 45 2 71 0 71 6496.36 262

WY 2023 1260 15 727 530 1257

Oct 2023 50 1 68 0 68 6493.69 243

Nov 2023 45 1 65 0 65 6490.56 222

Dec 2023 35 1 68 0 68 6485.33 189

Jan 2024 32 1 68 0 68 6478.85 153

Feb 2024 30 0 63 0 63 6471.53 119

Mar 2024 48 0 64 0 64 6467.44 103

Apr 2024 75 1 34 18 53 6472.80 124

May 2024 150 1 94 0 94 6483.64 179

Jun 2024 295 2 103 78 181 6500.26 290

Jul 2024 170 3 101 31 132 6504.89 325

Aug 2024 60 2 95 0 95 6500.01 288

Sep 2024 40 2 71 0 71 6495.51 256

WY 2024 1030 14 894 128 1022

Oct 2024 46 1 0 55 55 6494.01 245

Nov 2024 42 1 0 61 61 6491.16 226

Dec 2024 32 1 20 48 68 6485.49 190

Jan 2025 31 1 68 0 68 6478.85 153

Feb 2025 29 0 61 0 61 6471.81 120

Mar 2025 51 0 56 0 56 6470.62 115

Apr 2025 77 1 38 8 46 6477.38 145

May 2025 166 1 92 0 92 6489.89 218

Jun 2025 301 2 105 117 222 6500.77 294

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3228 Processed On: 7/12/2023 11:10:05AM 
Most Probable Inflow*

July 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)

* Jul 2022 125 110 11 79 0 79 106 6016.09 2780 137

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

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

WY 2022 897 837 70 927 60 987 2138

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

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

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

R 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

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

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

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

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

Jul 2023 180 155 14 71 0 71 127 6031.34 3317 150

Aug 2023 70 99 13 110 0 110 126 6030.76 3294 135

Sep 2023 50 76 11 113 0 113 125 6029.57 3248 133

WY 2023 1811 1805 75 1091 47 1138 3343

Oct 2023 63 81 7 114 0 114 123 6028.54 3209 149

Nov 2023 58 78 3 107 0 107 122 6027.69 3179 142

Dec 2023 39 72 2 114 0 114 120 6026.51 3136 146

Jan 2024 45 81 2 114 0 114 119 6025.57 3103 144

Feb 2024 49 82 2 106 0 106 118 6024.86 3078 136

Mar 2024 100 116 3 69 0 69 119 6026.04 3120 141

Apr 2024 125 103 5 67 0 67 121 6026.88 3150 307

May 2024 210 154 7 230 0 230 117 6024.62 3070 785

Jun 2024 380 266 10 64 0 64 125 6029.73 3255 464

Jul 2024 195 157 14 72 0 72 128 6031.50 3323 137

Aug 2024 70 105 13 109 0 109 127 6031.09 3307 127

Sep 2024 46 77 11 104 0 104 125 6030.13 3270 122

WY 2024 1380 1372 79 1271 0 1271 2801

Oct 2024 54 63 7 70 0 70 125 6029.77 3256 103

Nov 2024 51 70 3 78 0 78 124 6029.48 3245 112

Dec 2024 34 70 2 124 0 124 122 6028.05 3192 149

Jan 2025 42 79 2 124 0 124 121 6026.80 3147 149

Feb 2025 43 75 2 112 0 112 119 6025.76 3110 137

Mar 2025 85 90 3 61 0 61 120 6026.44 3134 135

Apr 2025 111 80 5 60 0 60 121 6026.87 3149 263

May 2025 239 165 7 196 0 196 119 6025.83 3112 709

Jun 2025 389 310 10 94 0 94 127 6031.17 3310 461

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3228 Processed On: 7/12/2023 11:10:05AM 
Most Probable Inflow*

July 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)

* Jul 2022 11 15 9314.18 77

H Aug 2022 8 14 9310.35 70

I Sep 2022 5 8 9308.87 68

WY 2022 110 100

S Oct 2022 6 6 9308.80 68

T Nov 2022 4 5 9308.13 67

O Dec 2022 5 5 9307.68 66

R Jan 2023 4 5 9307.08 65

I Feb 2023 4 5 9306.26 64

C Mar 2023 4 5 9305.50 63

A Apr 2023 7 9 9304.30 61

L May 2023 39 20 9316.35 80

* Jun 2023 50 28 9328.01 102

Jul 2023 24 26 9326.99 100

Aug 2023 12 22 9322.03 91

Sep 2023 8 18 9316.56 81

WY 2023 167 154

Oct 2023 8 13 9313.88 76

Nov 2023 6 6 9313.91 76

Dec 2023 6 6 9313.82 76

Jan 2024 5 6 9313.13 75

Feb 2024 5 6 9312.80 74

Mar 2024 5 6 9312.10 73

Apr 2024 9 9 9312.10 73

May 2024 29 15 9320.18 87

Jun 2024 40 21 9330.03 106

Jul 2024 16 24 9326.01 98

Aug 2024 8 21 9319.08 85

Sep 2024 6 18 9312.10 73

WY 2024 143 151

Oct 2024 6 9 9310.24 70

Nov 2024 5 6 9309.64 69

Dec 2024 4 6 9308.27 67

Jan 2025 5 6 9307.52 66

Feb 2025 4 6 9306.50 64

Mar 2025 5 6 9305.74 63

Apr 2025 9 6 9307.72 66

May 2025 26 12 9316.28 80

Jun 2025 40 18 9328.07 102

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3228 Processed On: 7/12/2023 11:10:05AM 
Most Probable Inflow*

July 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)

* Jul 2022 59 63 1 84 0 84 7460.15 368

H Aug 2022 57 64 1 89 0 89 7455.69 341

I Sep 2022 31 33 1 55 28 82 7446.72 292

WY 2022 661 652 6 566 28 595

S Oct 2022 32 32 0 0 58 58 7441.74 266

T Nov 2022 26 27 0 1 10 11 7444.87 282

O Dec 2022 24 25 0 6 10 17 7446.44 290

R Jan 2023 24 25 0 20 0 20 7447.43 295

I Feb 2023 20 21 0 20 0 20 7447.61 296

C Mar 2023 25 26 0 19 0 19 7448.79 303

A Apr 2023 77 79 1 23 0 23 7458.56 358

L May 2023 327 309 1 77 0 77 7491.44 589

* Jun 2023 312 290 1 106 6 131 7510.36 747

Jul 2023 129 131 2 115 0 115 7512.02 761

Aug 2023 63 73 1 100 0 100 7508.78 733

Sep 2023 40 50 1 27 66 93 7503.62 689

WY 2023 1100 1088 8 514 150 683

Oct 2023 40 45 1 69 0 69 7500.61 663

Nov 2023 34 34 0 52 0 52 7498.45 645

Dec 2023 29 29 0 82 0 82 7491.85 592

Jan 2024 26 27 0 42 0 42 7489.91 577

Feb 2024 23 24 0 40 0 40 7487.75 560

Mar 2024 36 37 0 43 0 43 7486.93 554

Apr 2024 70 70 1 46 0 46 7489.98 577

May 2024 215 201 1 57 0 57 7507.32 720

Jun 2024 250 231 1 127 0 127 7518.78 822

Jul 2024 95 103 2 105 0 105 7518.38 819

Aug 2024 53 66 1 112 0 112 7513.16 771

Sep 2024 34 46 1 103 0 103 7506.50 713

WY 2024 905 913 9 879 0 879

Oct 2024 35 38 1 87 0 87 7500.63 663

Nov 2024 31 32 0 54 0 54 7497.89 641

Dec 2024 26 28 0 77 0 77 7491.79 592

Jan 2025 25 26 0 49 0 49 7488.80 568

Feb 2025 23 25 0 44 0 44 7486.24 549

Mar 2025 38 39 0 39 0 39 7486.14 548

Apr 2025 78 75 1 43 0 43 7490.25 580

May 2025 204 190 1 67 0 67 7505.12 701

Jun 2025 251 229 1 129 0 129 7516.34 800

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3228 Processed On: 7/12/2023 11:10:05AM 
Most Probable Inflow*

July 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)

* Jul 2022 60 84 1 85 84 0 84 7152.31 111

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

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

WY 2022 685 595 24 619 614 0 614

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

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

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

R 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

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

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

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

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

Jul 2023 135 115 6 121 121 0 121 7153.73 112

Aug 2023 66 100 3 103 103 0 103 7153.73 112

Sep 2023 43 93 3 96 96 0 96 7153.73 112

WY 2023 1184 683 83 767 761 2 769

Oct 2023 43 69 3 72 72 0 72 7153.73 112

Nov 2023 36 52 2 54 54 0 54 7153.73 112

Dec 2023 31 82 2 84 84 0 84 7153.73 112

Jan 2024 28 42 2 44 44 0 44 7153.73 112

Feb 2024 25 40 2 42 42 0 42 7153.73 112

Mar 2024 40 43 4 47 47 0 47 7153.73 112

Apr 2024 80 46 10 56 56 0 56 7153.73 112

May 2024 245 57 30 87 87 0 87 7153.73 112

Jun 2024 270 127 20 147 147 0 147 7153.72 112

Jul 2024 100 105 5 110 110 0 110 7153.73 112

Aug 2024 56 112 3 115 115 0 115 7153.73 112

Sep 2024 36 103 2 105 105 0 105 7153.73 112

WY 2024 990 879 85 964 963 0 963

Oct 2024 37 87 2 89 89 0 89 7153.73 112

Nov 2024 32 54 1 55 55 0 55 7153.73 112

Dec 2024 27 77 1 78 78 0 78 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 39 2 41 41 0 41 7153.73 112

Apr 2025 89 43 11 54 53 0 53 7153.73 112

May 2025 226 67 22 89 89 0 89 7153.73 112

Jun 2025 265 129 14 143 143 0 143 7153.72 112

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3228 Processed On: 7/12/2023 11:10:05AM 
Most Probable Inflow*

July 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)

* Jul 2022 64 84 5 89 90 0 90 6747.68 15 65 28

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

I 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

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

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

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

R 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

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

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

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

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

Jul 2023 150 121 15 136 134 3 137 6753.04 17 65 72

Aug 2023 71 103 5 108 108 0 108 6753.04 17 65 43

Sep 2023 48 96 5 101 101 0 101 6753.04 17 55 46

WY 2023 1303 769 120 889 712 149 887 363 541

Oct 2023 49 72 6 78 52 26 78 6753.04 17 55 23

Nov 2023 41 54 5 59 59 0 59 6753.04 17 0 59

Dec 2023 36 84 5 89 89 0 89 6753.04 17 0 89

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

Feb 2024 29 42 4 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 93 56 13 69 69 0 69 6753.04 17 42 27

May 2024 285 87 40 127 127 0 127 6753.04 17 62 65

Jun 2024 305 147 35 182 130 52 182 6753.03 17 61 121

Jul 2024 110 110 10 120 120 0 120 6753.04 17 65 55

Aug 2024 61 115 5 120 120 0 120 6753.04 17 65 55

Sep 2024 41 105 5 110 110 0 110 6753.04 17 55 55

WY 2024 1130 963 140 1103 1025 78 1103 410 693

Oct 2024 42 89 5 94 56 38 94 6753.04 17 55 39

Nov 2024 37 55 5 60 60 0 60 6753.04 17 0 60

Dec 2024 32 78 5 83 83 0 83 6753.04 17 0 83

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 41 6 47 47 0 47 6753.04 17 5 42

Apr 2025 100 53 11 64 64 0 64 6753.04 17 42 22

May 2025 251 89 25 114 114 0 114 6753.04 17 62 52

Jun 2025 293 143 28 171 130 41 171 6753.03 17 61 110

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3228 Processed On: 7/12/2023 11:10:05AM 
Most Probable Inflow*

July 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)

* Jul 2022 19 32 7642.57 70

H Aug 2022 18 28 7637.64 59

I Sep 2022 12 26 7630.15 45

WY 2022 185 160

S Oct 2022 14 3 7635.84 56

T Nov 2022 7 0 7639.00 62

O Dec 2022 5 0 7641.15 67

R Jan 2023 5 0 7643.44 72

I Feb 2023 5 2 7644.74 75

C Mar 2023 7 36 7630.44 46

A Apr 2023 36 45 7625.05 36

L May 2023 119 64 7651.55 91

* Jun 2023 75 41 7664.54 124

Jul 2023 27 42 7658.56 109

Aug 2023 14 38 7648.78 84

Sep 2023 12 30 7640.86 66

WY 2023 326 301

Oct 2023 11 17 7637.82 60

Nov 2023 8 2 7640.73 66

Dec 2023 6 2 7642.61 70

Jan 2024 6 2 7644.44 74

Feb 2024 5 2 7645.84 77

Mar 2024 8 2 7648.40 83

Apr 2024 20 2 7655.71 101

May 2024 66 44 7664.08 123

Jun 2024 64 65 7663.67 122

Jul 2024 18 41 7654.41 98

Aug 2024 12 38 7643.39 72

Sep 2024 11 29 7634.50 53

WY 2024 235 245

Oct 2024 10 16 7630.96 47

Nov 2024 8 2 7634.24 53

Dec 2024 7 2 7636.83 58

Jan 2025 6 2 7638.82 62

Feb 2025 5 2 7640.35 65

Mar 2025 10 2 7644.00 73

Apr 2025 23 2 7652.86 94

May 2025 68 42 7662.60 119

Jun 2025 62 62 7662.24 118

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3228 Processed On: 7/12/2023 11:10:05AM 
Most Probable Inflow*

July 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)

* Jul 2022 44 5 54 3 39 35 6025.41 916 55

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

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

WY 2022 574 66 484 20 200 296 595

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

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

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

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

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

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

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

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

* Jun 2023 249 47 163 4 38 168 6060.10 1294 344

Jul 2023 53 4 64 4 52 18 6059.24 1283 105

Aug 2023 25 2 47 4 44 23 6057.36 1259 59

Sep 2023 25 1 42 3 24 21 6056.85 1253 50

WY 2023 1279 139 1116 25 203 508 1247

Oct 2023 35 2 40 2 9 18 6057.67 1263 42

Nov 2023 33 1 26 1 0 18 6058.22 1270 36

Dec 2023 28 0 23 1 0 18 6058.56 1274 33

Jan 2024 25 0 21 1 0 18 6058.68 1276 32

Feb 2024 29 1 25 1 0 17 6059.21 1282 30

Mar 2024 68 6 55 2 6 20 6061.43 1311 40

Apr 2024 140 17 104 3 21 21 6065.98 1370 68

May 2024 235 32 181 4 36 232 6059.00 1280 372

Jun 2024 180 23 157 4 52 139 6055.99 1243 274

Jul 2024 29 2 51 4 55 26 6053.12 1208 76

Aug 2024 25 2 49 3 46 30 6050.53 1177 60

Sep 2024 28 1 45 3 25 25 6049.93 1170 49

WY 2024 855 88 777 27 250 583 1113

Oct 2024 33 2 38 2 9 22 6050.46 1176 44

Nov 2024 29 1 22 1 0 21 6050.48 1177 39

Dec 2024 24 0 19 1 0 22 6050.18 1173 37

Jan 2025 22 0 18 1 0 22 6049.80 1169 35

Feb 2025 29 1 25 1 0 19 6050.18 1173 31

Mar 2025 92 10 74 1 5 22 6054.02 1219 45

Apr 2025 147 18 107 2 21 21 6059.17 1282 72

May 2025 251 34 191 4 35 22 6069.10 1413 157

Jun 2025 187 25 163 5 51 21 6075.19 1499 165

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3228 Processed On: 7/12/2023 11:10:05AM 
Most Probable Inflow*

July 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)

* Jul 2022 491 463 28 672 0 672 3536.20 4551 6212 672

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

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

WY 2022 6084 6107 203 6999 0 6999 7066

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

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

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

R 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

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

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

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

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

Jul 2023 1235 1134 40 1150 0 1150 3582.83 4815 9522 1165

Aug 2023 500 620 40 1015 0 1015 3577.80 4783 9120 1029

Sep 2023 430 567 36 820 0 820 3574.38 4762 8853 836

WY 2023 14001 12573 232 8952 90 9042 9215

Oct 2023 550 624 24 480 0 480 3575.81 4771 8964 496

Nov 2023 515 568 24 500 0 500 3576.33 4774 9004 505

Dec 2023 415 534 19 600 0 600 3575.32 4768 8925 603

Jan 2024 380 459 6 723 0 723 3572.07 4748 8675 727

Feb 2024 430 494 6 639 0 639 3570.23 4737 8535 650

Mar 2024 600 540 10 675 0 675 3568.44 4726 8401 689

Apr 2024 950 787 16 601 0 601 3570.54 4738 8559 618

May 2024 2200 2127 21 599 0 599 3588.07 4850 9954 620

Jun 2024 2400 1995 37 628 0 628 3602.14 4949 11185 645

Jul 2024 845 786 47 709 0 709 3602.45 4951 11213 724

Aug 2024 365 516 47 758 0 758 3599.49 4929 10945 772

Sep 2024 350 500 43 568 0 568 3598.35 4921 10843 584

WY 2024 10000 9929 300 7480 0 7480 7633

Oct 2024 447 514 29 643 0 643 3596.70 4909 10697 659

Nov 2024 466 509 28 642 0 642 3595.00 4897 10547 647

Dec 2024 361 499 22 715 0 715 3592.46 4880 10327 718

Jan 2025 350 456 7 857 0 857 3588.01 4850 9949 861

Feb 2025 397 478 7 755 3 758 3584.81 4828 9684 769

Mar 2025 614 537 11 801 0 801 3581.67 4808 9429 815

Apr 2025 920 746 18 713 0 713 3581.85 4809 9442 730

May 2025 2060 1720 22 710 0 710 3592.82 4882 10357 731

Jun 2025 2423 1915 38 745 0 745 3604.54 4966 11406 762

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3228 Processed On: 7/12/2023 11:10:05AM 
Most Probable Inflow*

July 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)

* Jul 2022 672 70 45 822 13.4 31 814 458 1040.92 7041

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

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

WY 2022 6999 787 463 8899 222 8888

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

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

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

R 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

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

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

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

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

Jul 2023 1150 55 48 774 12.6 51 774 550 1060.53 8463

Aug 2023 1015 86 53 742 12.1 50 742 566 1063.66 8703

Sep 2023 820 72 53 639 10.7 41 639 575 1065.59 8853

WY 2023 9042 1252 457 7955 257 7873

Oct 2023 480 77 50 502 8.2 32 502 574 1065.26 8827

Nov 2023 500 63 44 564 9.5 23 564 570 1064.45 8764

Dec 2023 600 72 36 469 7.6 23 469 579 1066.20 8900

Jan 2024 723 75 25 573 9.3 10 573 590 1068.48 9080

Feb 2024 639 71 23 544 9.5 7 544 598 1070.09 9207

Mar 2024 675 97 25 888 14.4 13 888 589 1068.26 9062

Apr 2024 601 60 34 1013 17.0 14 1013 565 1063.44 8686

May 2024 599 37 41 993 16.2 18 993 539 1058.29 8294

Jun 2024 628 22 50 896 15.1 26 896 519 1054.24 7992

Jul 2024 709 55 47 789 12.8 29 789 513 1052.93 7896

Aug 2024 758 86 51 752 12.2 31 752 514 1053.06 7906

Sep 2024 568 72 50 657 11.0 27 657 508 1051.85 7817

WY 2024 7480 786 475 8639 254 8639

Oct 2024 643 77 47 470 7.6 22 470 519 1054.18 7988

Nov 2024 642 63 42 589 9.9 12 589 523 1054.96 8046

Dec 2024 715 72 34 521 8.5 8 521 537 1057.78 8256

Jan 2025 857 75 24 569 9.2 13 569 557 1061.82 8562

Feb 2025 758 71 23 540 9.7 10 540 572 1064.95 8803

Mar 2025 801 97 25 884 14.4 18 884 570 1064.60 8776

Apr 2025 713 60 33 1009 17.0 20 1009 553 1061.07 8505

May 2025 710 37 41 989 16.1 26 989 534 1057.23 8214

Jun 2025 745 22 50 891 15.0 36 891 521 1054.57 8017

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3228 Processed On: 7/12/2023 11:10:05AM 
Most Probable Inflow*

July 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)

* Jul 2022 822 -26 12 770 0 770 12.5 643.97 1725

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

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

WY 2022 8899 -222 151 8495 0 8495

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

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

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

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

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

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

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

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

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

Jul 2023 774 -21 12 760 0 760 12.4 642.50 1685

Aug 2023 742 -17 16 717 0 717 11.7 642.25 1678

Sep 2023 639 -6 16 677 0 677 11.4 640.01 1617

WY 2023 7955 -114 151 7623 0 7666

Oct 2023 502 -11 14 660 0 660 10.7 633.00 1434

Nov 2023 564 -16 13 484 0 484 8.1 635.00 1486

Dec 2023 469 -2 13 336 0 336 5.5 639.51 1604

Jan 2024 573 -11 9 491 0 491 8.0 641.80 1666

Feb 2024 544 -13 8 524 0 524 9.1 641.80 1666

Mar 2024 888 -10 10 833 0 833 13.6 643.05 1700

Apr 2024 1013 -14 13 988 0 988 16.6 643.00 1699

May 2024 993 -13 14 966 0 966 15.7 643.00 1699

Jun 2024 896 -21 14 861 0 861 14.5 643.00 1699

Jul 2024 789 -21 12 783 0 783 12.7 642.00 1671

Aug 2024 752 -17 15 720 0 720 11.7 642.00 1671

Sep 2024 657 -6 16 688 0 688 11.6 640.01 1617

WY 2024 8639 -154 151 8334 0 8334

Oct 2024 470 -11 14 628 0 628 10.2 633.00 1434

Nov 2024 589 -16 13 509 0 509 8.6 635.00 1486

Dec 2024 521 -2 13 388 0 388 6.3 639.51 1604

Jan 2025 569 -11 9 487 0 487 7.9 641.80 1666

Feb 2025 540 -13 8 519 0 519 9.4 641.80 1666

Mar 2025 884 -10 10 829 0 829 13.5 643.05 1700

Apr 2025 1009 -14 13 984 0 984 16.5 643.00 1699

May 2025 989 -13 14 962 0 962 15.6 643.00 1699

Jun 2025 891 -21 14 857 0 857 14.4 643.00 1699

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3228 Processed On: 7/12/2023 11:10:05AM 
Most Probable Inflow*

July 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)

* Jul 2022 770 31 17 639 10.4 106 19 448.84 596 150 2.4

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

I 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

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

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

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

R 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

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

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

L May 2023 859 33 13 655 10.7 73 166 446.26 547 135 2.2

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

Jul 2023 760 17 17 663 10.8 71 19 448.00 580 131 2.1

Aug 2023 717 19 17 625 10.2 71 22 447.50 571 103 1.7

Sep 2023 677 12 15 537 9.0 82 45 447.50 570 96 1.6

WY 2023 7666 245 139 5974 866 857 1413

Oct 2023 660 21 12 500 8.1 85 76 447.50 571 102 1.7

Nov 2023 484 14 9 365 6.1 81 37 447.50 570 84 1.4

Dec 2023 336 17 7 263 4.3 84 13 446.50 552 84 1.4

Jan 2024 491 7 6 313 5.1 90 82 446.50 552 138 2.2

Feb 2024 524 4 8 411 7.1 12 90 446.50 552 124 2.2

Mar 2024 833 2 9 608 9.9 102 104 446.70 555 147 2.4

Apr 2024 988 7 11 727 12.2 93 116 448.70 593 147 2.5

May 2024 966 4 13 734 11.9 89 122 448.70 593 110 1.8

Jun 2024 861 10 16 714 12.0 86 43 448.70 593 116 2.0

Jul 2024 783 17 17 686 11.2 89 10 448.00 580 123 2.0

Aug 2024 720 19 17 621 10.1 89 10 447.50 571 102 1.7

Sep 2024 688 12 15 533 9.0 86 56 447.50 570 99 1.7

WY 2024 8334 134 139 6474 987 760 1376

Oct 2024 628 21 12 482 7.8 89 58 447.50 571 89 1.4

Nov 2024 509 14 9 375 6.3 86 47 447.50 570 115 1.9

Dec 2024 388 17 7 270 4.4 89 54 446.50 552 110 1.8

Jan 2025 487 7 6 313 5.1 86 82 446.50 552 138 2.2

Feb 2025 519 4 8 411 7.4 8 90 446.50 552 124 2.2

Mar 2025 829 2 9 608 9.9 98 104 446.70 555 147 2.4

Apr 2025 984 7 11 726 12.2 89 116 448.70 593 147 2.5

May 2025 962 4 13 733 11.9 85 122 448.70 593 110 1.8

Jun 2025 857 10 16 714 12.0 82 43 448.70 593 116 2.0

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3228 Processed On: 7/12/2023 11:10:05AM 
Most Probable Inflow*

July 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

* Jul 2022 822 13.4 1040.92 7041 -146 392.29 1236.6 287.9 94 350.1

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

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

WY 2022 8899 3240.9

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

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

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

R 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

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

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

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

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

Jul 2023 774 12.6 1060.53 8463 312 406.28 1283.0 283.4 90 366.3

Aug 2023 742 12.1 1063.66 8703 239 410.20 1320.6 273.4 90 368.3

Sep 2023 639 10.7 1065.59 8853 150 414.37 1213.0 235.0 82 367.9

WY 2023 7955 2875.8

Oct 2023 502 8.2 1065.26 8827 -25 419.61 924.9 190.8 63 379.9

Nov 2023 564 9.5 1064.45 8764 -64 421.33 924.9 213.0 63 377.6

Dec 2023 469 7.6 1066.20 8900 137 418.42 1098.0 175.5 74 374.6

Jan 2024 573 9.3 1068.48 9080 179 418.79 1020.0 213.7 69 373.2

Feb 2024 544 9.5 1070.09 9207 127 419.97 1027.0 203.9 69 375.0

Mar 2024 888 14.4 1068.26 9062 -145 418.13 1203.0 341.2 81 384.2

Apr 2024 1013 17.0 1063.44 8686 -376 412.49 1446.0 374.2 100 369.4

May 2024 993 16.2 1058.29 8294 -392 407.57 1418.0 359.5 100 362.0

Jun 2024 896 15.1 1054.24 7992 -302 403.02 1390.0 323.4 100 361.0

Jul 2024 789 12.8 1052.93 7896 -96 400.69 1399.4 284.6 100 360.5

Aug 2024 752 12.2 1053.06 7906 10 400.43 1399.4 269.4 100 358.4

Sep 2024 657 11.0 1051.85 7817 -88 400.55 1386.6 232.9 100 354.4

WY 2024 8639 3182.1

Oct 2024 470 7.6 1054.18 7988 170 407.28 876.4 172.3 63 366.9

Nov 2024 589 9.9 1054.96 8046 58 411.13 869.0 218.5 63 370.7

Dec 2024 521 8.5 1057.78 8256 210 408.30 1222.6 192.3 86 369.0

Jan 2025 569 9.2 1061.82 8562 306 411.20 1012.1 208.2 70 366.2

Feb 2025 540 9.7 1064.95 8803 241 414.00 1027.8 200.2 70 370.9

Mar 2025 884 14.4 1064.60 8776 -27 413.22 1268.4 334.5 87 378.5

Apr 2025 1009 17.0 1061.07 8505 -271 410.88 1251.4 373.8 87 370.5

May 2025 989 16.1 1057.23 8214 -290 407.21 1232.0 360.1 87 364.1

Jun 2025 891 15.0 1054.57 8017 -197 404.01 1212.8 324.5 87 364.0

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3228 Processed On: 7/12/2023 11:10:05AM 
Most Probable Inflow*

July 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

* Jul 2022 770 12.5 643.97 1725 14 144.37 255.0 99.3 100 129.1

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

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

WY 2022 8495 1074.5

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

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

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

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

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

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

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

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

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

Jul 2023 760 12.4 642.50 1685 -20 140.07 250.1 95.9 98 126.2

Aug 2023 717 11.7 642.25 1678 -7 139.86 255.0 90.4 100 126.0

Sep 2023 677 11.4 640.01 1617 -61 138.72 255.0 84.6 100 125.0

WY 2023 7623 970.1

Oct 2023 660 10.7 633.00 1434 -183 134.35 227.0 79.9 89 121.0

Nov 2023 484 8.1 635.00 1486 51 132.94 159.8 58.0 63 119.8

Dec 2023 336 5.5 639.51 1604 118 137.43 154.7 41.6 61 123.8

Jan 2024 491 8.0 641.80 1666 62 139.66 156.3 61.8 61 125.8

Feb 2024 524 9.1 641.80 1666 0 140.32 160.0 66.2 63 126.4

Mar 2024 833 13.6 643.05 1700 34 139.19 194.1 104.5 76 125.4

Apr 2024 988 16.6 643.00 1699 -2 138.73 249.9 123.5 98 125.0

May 2024 966 15.7 643.00 1699 0 139.01 255.0 121.0 100 125.2

Jun 2024 861 14.5 643.00 1699 0 139.44 255.0 108.2 100 125.6

Jul 2024 783 12.7 642.00 1671 -27 139.57 255.0 98.5 100 125.7

Aug 2024 720 11.7 642.00 1671 0 139.47 255.0 90.4 100 125.6

Sep 2024 688 11.6 640.01 1617 -54 138.52 255.0 85.9 100 124.8

WY 2024 8334 1039.4

Oct 2024 628 10.2 633.00 1434 -183 134.57 227.0 76.1 89 121.2

Nov 2024 509 8.6 635.00 1486 51 132.75 159.8 60.9 63 119.6

Dec 2024 388 6.3 639.51 1604 118 137.02 154.7 48.0 61 123.4

Jan 2025 487 7.9 641.80 1666 62 139.69 156.3 61.3 61 125.9

Feb 2025 519 9.4 641.80 1666 0 140.22 156.6 65.6 61 126.3

Mar 2025 829 13.5 643.05 1700 34 139.22 194.1 104.0 76 125.4

Apr 2025 984 16.5 643.00 1699 -2 138.76 249.9 123.0 98 125.0

May 2025 962 15.6 643.00 1699 0 139.03 255.0 120.5 100 125.3

Jun 2025 857 14.4 643.00 1699 0 139.46 255.0 107.6 100 125.6

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3228 Processed On: 7/12/2023 11:10:05AM 
Most Probable Inflow*

July 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

* Jul 2022 639 10.4 448.84 596 10 82.19 120.0 44.7 100 69.9

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

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

WY 2022 6231 431.0

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

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

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

R 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

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

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

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

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

Jul 2023 663 10.8 448.00 580 -5 78.69 120.0 46.3 100 69.8

Aug 2023 625 10.2 447.50 571 -9 78.57 120.0 43.4 100 69.4

Sep 2023 537 9.0 447.50 570 0 78.80 120.0 37.2 100 69.3

WY 2023 5961 412.4

Oct 2023 500 8.1 447.50 571 0 79.20 91.0 35.0 76 70.0

Nov 2023 365 6.1 447.50 570 0 80.16 92.0 25.1 77 68.7

Dec 2023 263 4.3 446.50 552 -19 80.64 112.3 16.8 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 6474 448.0

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

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3228 Processed On: 7/12/2023 11:10:05AM 
Most Probable Inflow*

July 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 

* Jul 2022 251 29 23 29 17 7

H Aug 2022 265 39 23 31 18 6

I Sep 2022 201 42 14 27 13 5

Summer 2022 1332 222 108 160 92 28

S Oct 2022 175 42 0 21 10 2

T Nov 2022 181 38 0 6 2 1

O Dec 2022 199 40 1 6 2 4

R Jan 2023 182 41 4 5 2 4

I Feb 2023 172 37 5 6 0 1

C Mar 2023 173 23 4 6 0 3

Winter 2023 1083 220 15 49 16 15

A Apr 2023 291 17 5 9 3 4

L May 2023 412 18 21 40 20 7

* Jun 2023 439 43 32 50 22 8

Jul 2023 463 24 36 43 23 8

Aug 2023 406 37 31 37 19 7

Sep 2023 325 38 8 35 17 5

Summer 2023 2336 177 133 213 106 38

Oct 2023 191 39 21 26 9 5

Nov 2023 198 36 16 19 10 5

Dec 2023 238 38 25 30 15 5

Jan 2024 285 38 12 16 9 4

Feb 2024 251 36 12 15 8 4

Mar 2024 263 23 13 17 9 3

Winter 2024 1426 211 98 124 60 25

Apr 2024 235 23 13 20 12 2

May 2024 239 77 17 31 22 6

Jun 2024 259 21 40 53 22 7

Jul 2024 296 24 33 40 21 8

Aug 2024 316 37 35 41 21 7

Sep 2024 236 35 32 38 19 5

Summer 2024 1581 218 171 223 117 35

Oct 2024 266 24 27 32 10 0

Nov 2024 265 26 16 20 10 0

Dec 2024 294 42 23 28 14 1

Jan 2025 351 42 15 18 10 4

Feb 2025 307 38 13 17 9 4

Mar 2025 324 21 12 15 8 3

Winter 2025 1806 192 105 130 61 12

Apr 2025 287 20 12 19 11 2

May 2025 289 66 20 32 20 6

Jun 2025 311 32 40 51 22 8

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3228 Processed On: 7/12/2023 11:10:05AM
Most Probable Inflow*

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

Jul 2023 463 78 354 13740 14635 19468 34103 109 14 46 169 13740 19468 33377 1500 774 0 26.2

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

Aug 2023 372 64 365 13792 14593 19157 33749 372 64 365 801 13792 19157 33749 1500 742 0 25.9

Sep 2023 426 92 389 14194 15101 18917 34018 426 92 389 907 14194 18917 34018 2270 639 0 25.6

Oct 2023 500 136 395 14461 15493 18767 34260 500 136 395 1032 14461 18767 34260 3040 502 0 25.4

Nov 2023 558 161 385 14350 15454 18793 34247 558 161 385 1104 14350 18793 34247 3810 564 0 25.3

Dec 2023 610 179 378 14309 15477 18856 34333 610 179 378 1167 14309 18856 34333 4580 469 0 25.4

Jan 2024 686 233 374 14389 15680 18720 34400 686 233 374 1292 14389 18720 34400 5350 573 0 25.3

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

Jan 2024 686 233 374 14389 15680 18720 34400 381 233 121 734 14389 18720 33843 5350 573 0 25.3

Feb 2024 755 248 372 14639 16014 18540 34554 450 248 118 816 14639 18540 33995 1500 544 0 25.2

Mar 2024 814 264 365 14779 16223 18413 34636 507 264 111 883 14779 18413 34075 1500 888 0 25.0

Apr 2024 788 271 337 14913 16309 18558 34867 477 271 75 823 14913 18558 34294 1500 1013 0 25.0

May 2024 737 247 277 14755 16017 18934 34951 419 247 -8 658 14755 18934 34347 1500 993 0 26.0

Jun 2024 762 105 368 13360 14595 19326 33921 439 105 43 587 13360 19326 33273 1500 896 0 27.3

Jul 2024 466 2 405 12128 13002 19628 32630 123 -10 25 138 12128 19628 31894 1500 789 0 27.3

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

Aug 2024 362 6 440 12101 12909 19724 32633 362 6 440 808 12101 19724 32633 1500 752 0 26.9

Sep 2024 415 53 471 12368 13308 19714 33022 415 53 471 939 12368 19714 33022 2270 657 0 26.5

Oct 2024 485 112 478 12471 13545 19803 33348 485 112 478 1074 12471 19803 33348 3040 470 0 26.2

Nov 2024 509 161 471 12617 13759 19632 33392 509 161 471 1142 12617 19632 33392 3810 589 0 26.1

Dec 2024 540 184 471 12767 13962 19574 33536 540 184 471 1195 12767 19574 33536 4580 521 0 26.1

Jan 2025 629 233 475 12987 14324 19364 33688 629 233 475 1337 12987 19364 33688 5350 569 0 26.0

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

Jan 2025 629 233 475 12987 14324 19364 33688 349 233 475 1056 12987 19364 33407 5350 569 0 26.0

Feb 2025 711 256 479 13365 14812 19058 33870 430 256 479 1166 13365 19058 33588 1500 540 0 25.9

Mar 2025 781 276 475 13630 15162 18817 33979 499 276 475 1249 13630 18817 33697 1500 884 0 25.7

Apr 2025 762 277 429 13885 15353 18844 34197 475 277 424 1176 13885 18844 33905 1500 1009 0 25.6

May 2025 716 245 366 13871 15199 19115 34314 424 245 338 1007 13871 19115 33993 1500 989 0 26.5

Jun 2025 681 123 235 12956 13996 19406 33402 381 118 168 667 12956 19406 33030 1500 891 0 27.9

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3228 Processed On: 7/12/2023 11:10:05AM