Subject: June 2023 Most Probable 24-Month Study

The operation of Lake Powell and Lake Mead in the June 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 has 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; new completed system conservation agreements under the Lower Colorado River Basin System Conservation and Efficiency Program (LC 

Conservation Program); and updated Lower Basin tributary inflow projections (reflecting current conditions) above Lake Mead and for the Gila River. 

Consistent with this operating approach and based on the most probable inflow forecast, the June 2023 24-Month Study projects a balancing release of 9.16 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 and are as follows. The 

observed unregulated inflow into Lake Powell for the month of May was 4.52 maf or 218 % of the 30-year average from 1991 to 2020. The June 2023 unregulated 

inflow forecast for Lake Powell is 3.70 maf or 151 % of the 30-year average. The 2023 April through July unregulated inflow forecast is 10.70 maf or 167 % 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 0.87 maf. Consumptive use for Nevada above Hoover (SNWP Use) is projected to be 0.24 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) May Inflow Forecast (kaf)

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

Lake Powell 270 573 1399 4520 155% 3700 1080 475 10700 167%

Fontenelle 28 29 75 323 89% 310 122 60 830 113%

Flaming Gorge 33 49 188 521 150% 430 141 70 1280 133%

Blue Mesa 19.9 25 77 327 99% 326 115 60 845 133%

Morrow Point 21 26 85 364 97% 340 121 63 910 132%

Crystal 23 29 97 406 99% 385 132 67 1020 132%

Taylor Park 3.6 3.2 7.1 39 81% 51 21 11 118 126%

Vallecito 4.7 6.6 36 119 153% 87 23 14 265 150%

Navajo 17.8 71 245 488 167% 237 40 21 1010 160%

Lemon 0.74 0.97 7.4 32 135% 27 6.3 4 73 152%

McPhee 3.2 9.1 147 249 242% 107 27 14 530 208%

Ridgway 3.2 4.9 10.5 30 107% 46 25 11 112 122%

Deerlodge 8.4 32 366 1043 178% 470 81 25 1960 165%

Durango 1.19 11.2 61 218 123% 220 71 35 570 148%

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_06_ucb.pdf. 

Information on the LC Conservation Program is available online at: 

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

June 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)

* Jun 2022 241 2 82 0 82 6503.59 315

H Jul 2022 102 3 83 11 93 6504.34 321

I Aug 2022 56 2 67 1 68 6502.43 306

S Sep 2022 29 2 61 0 61 6498.08 274

WY 2022 744 15 617 67 685

T Oct 2022 40 1 22 39 61 6494.58 249

O Nov 2022 33 1 10 48 58 6490.90 224

R Dec 2022 28 1 56 2 58 6486.14 194

I Jan 2023 32 1 58 0 59 6481.53 167

C Feb 2023 28 0 10 43 53 6476.59 141

A Mar 2023 29 0 55 3 58 6470.02 113

L Apr 2023 75 1 61 0 61 6473.29 126

* May 2023 323 1 102 95 198 6494.66 250

Jun 2023 310 2 103 165 268 6500.19 290

Jul 2023 122 3 92 0 92 6503.79 317

Aug 2023 60 2 92 0 92 6499.20 282

Sep 2023 45 2 71 0 71 6495.29 254

WY 2023 1125 15 732 397 1129

Oct 2023 45 1 74 0 74 6490.92 224

Nov 2023 42 1 64 0 64 6487.46 202

Dec 2023 33 1 61 0 61 6482.60 173

Jan 2024 32 1 61 0 61 6476.88 143

Feb 2024 30 0 58 0 58 6470.56 115

Mar 2024 48 0 61 0 61 6467.02 101

Apr 2024 75 1 34 18 53 6472.43 123

May 2024 145 1 92 0 92 6482.84 174

Jun 2024 290 2 103 78 181 6499.07 281

Jul 2024 170 3 102 30 132 6503.78 317

Aug 2024 60 2 97 0 97 6498.54 278

Sep 2024 40 2 88 0 88 6491.43 228

WY 2024 1010 14 896 126 1022

Oct 2024 46 1 55 0 55 6489.87 217

Nov 2024 42 1 57 0 57 6487.42 202

Dec 2024 32 1 61 0 61 6482.39 172

Jan 2025 31 1 61 0 61 6476.42 141

Feb 2025 29 0 56 0 56 6470.26 114

Mar 2025 51 0 53 0 53 6469.73 111

Apr 2025 77 1 38 8 46 6476.64 142

May 2025 166 1 92 0 92 6489.34 214

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3226 Processed On: 6/9/2023 1:03:34PM 
Most Probable Inflow*

June 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)

* Jun 2022 274 113 9 110 12 121 113 6015.25 2752 465

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

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

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

WY 2022 897 837 70 927 60 987 2138

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

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

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

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

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

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

L Apr 2023 188 181 4 48 0 48 98 6010.17 2589 407

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

Jun 2023 430 388 10 163 0 163 120 6026.16 3124 633

Jul 2023 141 111 13 86 0 86 120 6026.50 3136 167

Aug 2023 70 102 12 97 0 97 120 6026.33 3130 122

Sep 2023 50 76 10 104 0 104 118 6025.30 3094 124

WY 2023 1628 1640 72 1133 5 1138 3302

Oct 2023 58 87 7 60 0 60 119 6025.85 3113 95

Nov 2023 55 77 3 57 0 57 120 6026.31 3129 92

Dec 2023 37 65 2 78 0 78 119 6025.92 3115 110

Jan 2024 45 74 2 78 0 78 119 6025.77 3110 108

Feb 2024 49 77 2 73 0 73 119 6025.80 3111 103

Mar 2024 100 113 3 85 0 85 120 6026.51 3136 157

Apr 2024 125 103 5 82 0 82 121 6026.95 3152 327

May 2024 200 147 7 227 0 227 117 6024.58 3068 787

Jun 2024 360 251 10 63 0 63 124 6029.32 3239 463

Jul 2024 195 157 14 72 0 72 127 6031.10 3308 137

Aug 2024 70 107 13 103 0 103 127 6030.88 3299 121

Sep 2024 46 94 11 104 0 104 126 6030.34 3278 122

WY 2024 1340 1352 78 1082 0 1082 2622

Oct 2024 54 63 7 70 0 70 125 6029.99 3265 103

Nov 2024 51 66 3 74 0 74 125 6029.69 3253 108

Dec 2024 34 63 2 118 0 118 123 6028.25 3199 143

Jan 2025 42 72 2 118 0 118 121 6026.98 3153 143

Feb 2025 43 70 2 107 0 107 119 6025.91 3115 132

Mar 2025 85 87 3 61 0 61 120 6026.52 3137 135

Apr 2025 111 80 5 60 0 60 121 6026.95 3152 263

May 2025 239 165 7 196 0 196 119 6025.91 3115 709

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3226 Processed On: 6/9/2023 1:03:34PM 
Most Probable Inflow*

June 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)

* Jun 2022 26 19 9316.61 81

H Jul 2022 11 15 9314.18 77

I Aug 2022 8 14 9310.35 70

S Sep 2022 5 8 9308.87 68

WY 2022 110 100

T Oct 2022 6 6 9308.80 68

O Nov 2022 4 5 9308.13 67

R Dec 2022 5 5 9307.68 66

I Jan 2023 4 5 9307.08 65

C Feb 2023 4 5 9306.26 64

A Mar 2023 4 5 9305.50 63

L Apr 2023 7 9 9304.30 61

* May 2023 39 20 9316.35 80

Jun 2023 51 27 9329.21 105

Jul 2023 21 25 9327.41 101

Aug 2023 11 22 9321.93 91

Sep 2023 7 18 9315.88 80

WY 2023 163 151

Oct 2023 8 13 9313.17 75

Nov 2023 6 13 9308.65 68

Dec 2023 6 6 9308.68 68

Jan 2024 5 6 9307.94 67

Feb 2024 5 6 9307.19 66

Mar 2024 5 6 9306.82 65

Apr 2024 9 6 9308.68 68

May 2024 29 12 9318.82 85

Jun 2024 40 18 9330.29 107

Jul 2024 16 24 9326.29 99

Aug 2024 8 18 9321.02 89

Sep 2024 6 18 9314.22 77

WY 2024 143 146

Oct 2024 6 9 9312.42 74

Nov 2024 5 9 9309.95 70

Dec 2024 4 6 9308.71 68

Jan 2025 5 6 9307.97 67

Feb 2025 4 6 9306.56 65

Mar 2025 5 6 9306.19 64

Apr 2025 9 6 9308.07 67

May 2025 26 9 9318.29 84

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3226 Processed On: 6/9/2023 1:03:34PM 
Most Probable Inflow*

June 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)

* Jun 2022 133 126 1 69 0 69 7463.76 391

H Jul 2022 59 63 1 84 0 84 7460.15 368

I Aug 2022 57 64 1 89 0 89 7455.69 341

S Sep 2022 31 33 1 55 28 82 7446.72 292

WY 2022 661 652 6 566 28 595

T Oct 2022 32 32 0 0 58 58 7441.74 266

O Nov 2022 26 27 0 1 10 11 7444.87 282

R Dec 2022 24 25 0 6 10 17 7446.44 290

I Jan 2023 24 25 0 20 0 20 7447.43 295

C Feb 2023 20 21 0 20 0 20 7447.61 296

A Mar 2023 25 26 0 19 0 19 7448.79 303

L Apr 2023 77 79 1 23 0 23 7458.56 358

* May 2023 327 309 1 77 0 77 7491.44 589

Jun 2023 326 302 1 120 0 120 7512.92 769

Jul 2023 115 119 2 126 0 126 7511.90 760

Aug 2023 60 71 1 104 0 104 7507.97 726

Sep 2023 38 49 1 27 71 98 7502.08 675

WY 2023 1095 1084 8 543 150 693

Oct 2023 40 45 1 73 0 73 7498.57 646

Nov 2023 34 41 0 52 0 52 7497.28 636

Dec 2023 29 29 0 82 0 82 7490.61 582

Jan 2024 26 27 0 42 0 42 7488.65 567

Feb 2024 23 24 0 40 0 40 7486.56 551

Mar 2024 36 37 0 43 0 43 7485.66 544

Apr 2024 70 67 1 46 0 46 7488.36 565

May 2024 215 198 1 57 0 57 7505.50 705

Jun 2024 250 228 1 119 0 119 7517.63 812

Jul 2024 95 103 2 105 0 105 7517.23 808

Aug 2024 53 63 1 112 0 112 7511.63 758

Sep 2024 34 46 1 103 0 103 7504.92 700

WY 2024 905 908 9 875 0 875

Oct 2024 35 38 1 87 0 87 7499.00 650

Nov 2024 31 35 0 54 0 54 7496.60 630

Dec 2024 26 28 0 77 0 77 7490.43 581

Jan 2025 25 26 0 49 0 49 7487.42 558

Feb 2025 23 25 0 44 0 44 7484.92 539

Mar 2025 38 39 0 39 0 39 7484.74 537

Apr 2025 78 75 1 43 0 43 7488.90 569

May 2025 204 187 1 67 0 67 7503.53 688

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3226 Processed On: 6/9/2023 1:03:34PM 
Most Probable Inflow*

June 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)

* Jun 2022 134 69 1 70 71 0 71 7150.86 110

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

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

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

WY 2022 685 595 24 619 614 0 614

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

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

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

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

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

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

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

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

Jun 2023 340 120 14 134 134 0 134 7153.72 112

Jul 2023 121 126 6 132 132 0 132 7153.73 112

Aug 2023 63 104 3 107 107 0 107 7153.73 112

Sep 2023 40 98 2 100 100 0 100 7153.73 112

WY 2023 1173 693 78 771 773 0 773

Oct 2023 43 73 3 76 76 0 76 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 270 119 20 139 139 0 139 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 990 875 85 960 959 0 959

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

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3226 Processed On: 6/9/2023 1:03:34PM 
Most Probable Inflow*

June 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)

* Jun 2022 145 71 10 82 80 2 81 6752.67 17 62 21

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

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

S 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

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

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

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

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

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

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

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

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

Jun 2023 385 134 45 179 130 48 178 6753.03 17 61 117

Jul 2023 132 132 11 143 134 9 143 6753.04 17 65 78

Aug 2023 67 107 4 111 111 0 111 6753.04 17 65 46

Sep 2023 44 100 4 104 104 0 104 6753.04 17 55 49

WY 2023 1305 773 132 905 729 170 904 361 548

Oct 2023 49 76 6 82 52 30 82 6753.04 17 55 27

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 305 139 35 174 130 44 174 6753.03 17 61 113

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 959 140 1099 1025 74 1099 410 689

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

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3226 Processed On: 6/9/2023 1:03:34PM 
Most Probable Inflow*

June 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)

* Jun 2022 26 34 7648.50 83

H Jul 2022 19 32 7642.57 70

I Aug 2022 18 28 7637.64 59

S Sep 2022 12 26 7630.15 45

WY 2022 185 160

T Oct 2022 14 3 7635.84 56

O Nov 2022 7 0 7639.00 62

R Dec 2022 5 0 7641.15 67

I Jan 2023 5 0 7643.44 72

C Feb 2023 5 2 7644.74 75

A Mar 2023 7 36 7630.44 46

L Apr 2023 36 45 7625.05 36

* May 2023 119 64 7651.55 91

Jun 2023 87 54 7664.08 123

Jul 2023 23 42 7656.79 104

Aug 2023 14 38 7646.85 80

Sep 2023 12 30 7638.72 62

WY 2023 334 314

Oct 2023 11 17 7635.58 55

Nov 2023 8 2 7638.59 62

Dec 2023 7 2 7640.99 67

Jan 2024 6 2 7642.87 71

Feb 2024 5 2 7644.29 74

Mar 2024 8 2 7646.90 80

Apr 2024 20 2 7654.32 98

May 2024 66 39 7664.45 124

Jun 2024 64 65 7664.04 123

Jul 2024 18 41 7654.81 99

Aug 2024 12 38 7643.84 73

Sep 2024 11 29 7635.01 54

WY 2024 236 240

Oct 2024 10 16 7631.51 48

Nov 2024 8 2 7634.76 54

Dec 2024 7 2 7637.32 59

Jan 2025 6 2 7639.29 63

Feb 2025 5 2 7640.81 66

Mar 2025 10 2 7644.44 74

Apr 2025 23 2 7653.26 95

May 2025 68 42 7662.98 120

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3226 Processed On: 6/9/2023 1:03:34PM 
Most Probable Inflow*

June 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)

* Jun 2022 47 7 50 3 37 24 6027.89 939 61

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

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

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

WY 2022 574 66 484 20 200 296 595

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

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

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

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

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

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

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

* May 2023 488 59 376 3 28 128 6063.70 1340 343

Jun 2023 237 32 172 4 48 192 6058.04 1268 412

Jul 2023 40 2 56 4 52 19 6056.53 1249 90

Aug 2023 21 1 44 3 44 24 6054.26 1221 59

Sep 2023 26 1 43 3 24 22 6053.77 1216 50

WY 2023 1251 121 1115 24 213 533 1298

Oct 2023 35 2 40 2 9 18 6054.62 1226 42

Nov 2023 33 1 26 1 0 18 6055.18 1233 36

Dec 2023 28 0 22 1 0 18 6055.45 1236 33

Jan 2024 25 0 21 1 0 22 6055.33 1234 36

Feb 2024 29 1 25 1 0 20 6055.64 1238 33

Mar 2024 68 6 55 2 6 22 6057.80 1265 42

Apr 2024 140 17 104 2 21 21 6062.50 1325 68

May 2024 235 32 176 4 36 181 6059.09 1281 321

Jun 2024 180 23 157 4 52 139 6056.08 1244 274

Jul 2024 29 2 51 4 55 26 6053.21 1209 76

Aug 2024 25 2 49 3 46 30 6050.62 1178 60

Sep 2024 28 1 45 3 25 25 6050.03 1171 49

WY 2024 855 88 771 26 250 539 1069

Oct 2024 33 2 38 2 9 22 6050.55 1177 44

Nov 2024 29 1 22 1 0 21 6050.57 1178 39

Dec 2024 24 0 19 1 0 22 6050.27 1174 37

Jan 2025 22 0 18 1 0 22 6049.89 1170 35

Feb 2025 29 1 25 1 0 19 6050.27 1174 31

Mar 2025 92 10 74 1 5 22 6054.11 1220 45

Apr 2025 147 18 107 2 21 21 6059.25 1283 72

May 2025 251 34 191 4 35 147 6059.71 1289 282

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3226 Processed On: 6/9/2023 1:03:34PM 
Most Probable Inflow*

June 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)

* Jun 2022 1284 1198 25 598 0 598 3539.81 4604 6878 595

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

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

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

WY 2022 6084 6107 203 6999 0 6999 7066

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

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

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

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

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

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

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

* May 2023 4520 3634 15 1088 0 1088 3561.42 4685 7888 1109

Jun 2023 3700 3262 31 1064 0 1064 3587.36 4845 9894 1081

Jul 2023 1080 1069 41 1150 0 1150 3585.99 4836 9781 1165

Aug 2023 475 593 40 1135 0 1135 3579.35 4793 9242 1149

Sep 2023 400 535 36 820 0 820 3575.57 4769 8945 836

WY 2023 13845 12795 234 9072 90 9162 9335

Oct 2023 550 579 25 480 0 480 3576.46 4775 9014 496

Nov 2023 515 520 24 500 0 500 3576.41 4775 9010 505

Dec 2023 415 500 19 600 0 600 3575.00 4766 8900 603

Jan 2024 380 426 6 723 0 723 3571.35 4743 8620 727

Feb 2024 430 464 6 639 0 639 3569.13 4730 8452 650

Mar 2024 600 557 10 675 0 675 3567.54 4720 8334 689

Apr 2024 950 802 16 601 0 601 3569.83 4734 8505 618

May 2024 2200 2082 21 599 0 599 3586.94 4842 9860 620

Jun 2024 2400 2006 37 628 0 628 3601.22 4942 11102 645

Jul 2024 845 786 47 709 0 709 3601.53 4944 11130 724

Aug 2024 365 510 46 758 0 758 3598.50 4922 10857 772

Sep 2024 350 500 42 568 0 568 3597.35 4914 10755 584

WY 2024 10000 9733 298 7480 0 7480 7633

Oct 2024 447 514 29 643 0 643 3595.70 4902 10609 659

Nov 2024 466 505 28 642 0 642 3593.96 4890 10456 647

Dec 2024 361 494 22 715 0 715 3591.35 4872 10231 718

Jan 2025 350 450 6 857 0 857 3586.81 4842 9849 861

Feb 2025 397 473 7 754 4 758 3583.53 4820 9579 769

Mar 2025 614 537 11 801 0 801 3580.37 4800 9324 815

Apr 2025 920 746 18 713 0 713 3580.55 4801 9338 730

May 2025 2060 1846 22 710 0 710 3592.95 4883 10369 731

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3226 Processed On: 6/9/2023 1:03:34PM 
Most Probable Inflow*

June 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)

* Jun 2022 598 16 47 889 14.9 29 877 467 1043.02 7187

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

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

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

WY 2022 6999 787 463 8899 222 8888

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

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

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

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

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

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

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

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

Jun 2023 1064 75 50 896 15.1 36 896 529 1056.27 8143

Jul 2023 1150 55 48 827 13.4 36 827 547 1059.94 8418

Aug 2023 1135 86 53 735 12.0 36 735 571 1064.79 8790

Sep 2023 820 72 53 647 10.9 28 647 581 1066.77 8945

WY 2023 9162 1266 458 8020 229 7949

Oct 2023 480 77 50 498 8.1 20 498 581 1066.64 8935

Nov 2023 500 63 44 598 10.0 12 598 575 1065.55 8849

Dec 2023 600 72 36 500 8.1 12 500 583 1067.05 8967

Jan 2024 723 75 25 587 9.5 10 587 594 1069.15 9132

Feb 2024 639 71 23 559 9.7 7 559 601 1070.58 9246

Mar 2024 675 97 25 903 14.7 13 903 591 1068.57 9086

Apr 2024 601 60 34 1029 17.3 15 1029 565 1063.55 8695

May 2024 599 37 42 1010 16.4 19 1010 539 1058.20 8287

Jun 2024 628 22 50 895 15.0 26 895 519 1054.15 7986

Jul 2024 709 55 47 787 12.8 30 787 513 1052.87 7892

Aug 2024 758 86 51 749 12.2 32 749 514 1053.03 7903

Sep 2024 568 72 50 670 11.3 28 670 507 1051.64 7802

WY 2024 7480 786 476 8783 224 8783

Oct 2024 643 77 47 483 7.8 23 483 517 1053.80 7960

Nov 2024 642 63 42 588 9.9 13 588 521 1054.59 8018

Dec 2024 715 72 34 521 8.5 8 521 535 1057.42 8229

Jan 2025 857 75 24 583 9.5 12 583 554 1061.31 8523

Feb 2025 758 71 22 554 10.0 9 554 569 1064.28 8751

Mar 2025 801 97 25 899 14.6 16 899 566 1063.77 8711

Apr 2025 713 60 33 1025 17.2 18 1025 548 1060.05 8427

May 2025 710 37 41 1005 16.4 23 1005 528 1056.01 8123

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3226 Processed On: 6/9/2023 1:03:34PM 
Most Probable Inflow*

June 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)

* Jun 2022 889 -30 14 842 0 842 14.1 643.47 1712

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

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

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

WY 2022 8899 -222 151 8495 0 8495

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

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

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

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

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

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

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

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

Jun 2023 896 -21 14 830 0 830 13.9 643.00 1699

Jul 2023 827 -21 12 807 0 807 13.1 642.50 1685

Aug 2023 735 -17 16 717 0 717 11.7 642.00 1671

Sep 2023 647 -6 16 678 0 678 11.4 640.01 1617

WY 2023 8020 -120 151 7681 0 7725

Oct 2023 498 -11 14 656 0 656 10.7 633.00 1434

Nov 2023 598 -16 13 518 0 518 8.7 635.00 1486

Dec 2023 500 -2 13 367 0 367 6.0 639.51 1604

Jan 2024 587 -11 9 505 0 505 8.2 641.80 1666

Feb 2024 559 -13 8 538 0 538 9.4 641.80 1666

Mar 2024 903 -10 10 849 0 849 13.8 643.05 1700

Apr 2024 1029 -14 13 1004 0 1004 16.9 643.00 1699

May 2024 1010 -13 14 982 0 982 16.0 643.00 1699

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

Jul 2024 787 -21 12 780 0 780 12.7 642.00 1671

Aug 2024 749 -17 15 717 0 717 11.7 642.00 1671

Sep 2024 670 -6 16 701 0 701 11.8 640.01 1617

WY 2024 8783 -154 151 8478 0 8478

Oct 2024 483 -11 14 641 0 641 10.4 633.00 1434

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

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

Jan 2025 583 -11 9 501 0 501 8.2 641.80 1666

Feb 2025 554 -13 8 534 0 534 9.6 641.80 1666

Mar 2025 899 -10 10 844 0 844 13.7 643.05 1700

Apr 2025 1025 -14 13 1000 0 1000 16.8 643.00 1699

May 2025 1005 -13 14 978 0 978 15.9 643.00 1699

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3226 Processed On: 6/9/2023 1:03:34PM 
Most Probable Inflow*

June 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)

* Jun 2022 842 18 15 679 11.4 103 60 448.30 586 154 2.6

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

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

S 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

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

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

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

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

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

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

L Apr 2023 844 52 11 669 11.2 49 169 447.68 574 153 2.6

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

Jun 2023 830 10 15 674 11.3 67 39 448.00 580 130 2.2

Jul 2023 807 17 17 709 11.5 71 16 448.00 580 130 2.1

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

Sep 2023 678 12 15 535 9.0 82 48 447.50 570 93 1.6

WY 2023 7725 238 139 6056 862 828 1410

Oct 2023 656 21 12 466 7.6 85 106 447.50 571 68 1.1

Nov 2023 518 14 9 353 5.9 83 81 447.50 570 84 1.4

Dec 2023 367 17 7 251 4.1 86 54 446.50 552 84 1.4

Jan 2024 505 7 6 313 5.1 90 97 446.50 552 138 2.2

Feb 2024 538 4 8 411 7.1 12 105 446.50 552 124 2.2

Mar 2024 849 2 9 608 9.9 102 119 446.70 555 147 2.4

Apr 2024 1004 7 11 727 12.2 93 132 448.70 593 147 2.5

May 2024 982 4 13 734 11.9 89 139 448.70 593 110 1.8

Jun 2024 860 10 16 714 12.0 86 42 448.70 593 116 2.0

Jul 2024 780 17 17 686 11.2 89 7 448.00 580 123 2.0

Aug 2024 717 19 17 621 10.1 89 7 447.50 571 102 1.7

Sep 2024 701 12 15 533 9.0 86 69 447.50 570 99 1.7

WY 2024 8478 134 139 6416 990 958 1343

Oct 2024 641 21 12 482 7.8 89 71 447.50 571 89 1.4

Nov 2024 508 14 9 375 6.3 86 46 447.50 570 115 1.9

Dec 2024 388 17 7 270 4.4 89 53 446.50 552 110 1.8

Jan 2025 501 7 6 313 5.1 86 97 446.50 552 138 2.2

Feb 2025 534 4 8 411 7.4 8 105 446.50 552 124 2.2

Mar 2025 844 2 9 608 9.9 98 119 446.70 555 147 2.4

Apr 2025 1000 7 11 726 12.2 89 132 448.70 593 147 2.5

May 2025 978 4 13 733 11.9 85 139 448.70 593 110 1.8

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3226 Processed On: 6/9/2023 1:03:34PM 
Most Probable Inflow*

June 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

* Jun 2022 889 14.9 1043.02 7187 -330 396.77 1076.9 315.1 81 354.6

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

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

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

WY 2022 8899 3240.9

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

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

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

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

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

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

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

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

Jun 2023 896 15.1 1056.27 8143 147 404.75 1080.0 328.9 78 367.0

Jul 2023 827 13.4 1059.94 8418 276 405.99 1283.0 304.7 90 368.5

Aug 2023 735 12.0 1064.79 8790 372 410.54 1320.6 270.8 90 368.2

Sep 2023 647 10.9 1066.77 8945 154 414.89 1312.0 238.0 89 368.0

WY 2023 8019 2899.5

Oct 2023 498 8.1 1066.64 8935 -10 420.88 924.9 189.6 63 380.7

Nov 2023 598 10.0 1065.55 8849 -85 422.56 924.9 228.1 63 381.5

Dec 2023 500 8.1 1067.05 8967 117 419.40 1098.0 188.9 74 378.0

Jan 2024 587 9.5 1069.15 9132 165 419.54 1020.0 220.1 69 375.1

Feb 2024 559 9.7 1070.58 9246 113 420.54 1027.0 210.4 69 376.7

Mar 2024 903 14.7 1068.57 9086 -160 418.53 1203.0 341.7 81 378.3

Apr 2024 1029 17.3 1063.55 8695 -391 412.70 1446.0 381.2 100 370.4

May 2024 1010 16.4 1058.20 8287 -408 407.58 1418.0 366.3 100 362.8

Jun 2024 895 15.0 1054.15 7986 -301 402.93 1390.0 322.8 100 360.9

Jul 2024 787 12.8 1052.87 7892 -94 400.62 1399.4 283.4 100 360.3

Aug 2024 749 12.2 1053.03 7903 11 400.39 1399.4 268.2 100 358.2

Sep 2024 670 11.3 1051.64 7802 -101 400.43 1386.6 237.9 100 355.1

WY 2024 8783 3238.7

Oct 2024 483 7.8 1053.80 7960 158 404.45 1215.9 175.2 87 363.1

Nov 2024 588 9.9 1054.59 8018 59 409.56 1029.6 216.0 74 367.1

Dec 2024 521 8.5 1057.42 8229 211 407.93 1220.4 191.9 86 368.7

Jan 2025 583 9.5 1061.31 8523 294 410.76 1009.5 213.8 70 366.9

Feb 2025 554 10.0 1064.28 8751 228 413.42 1024.5 206.0 70 371.6

Mar 2025 899 14.6 1063.77 8711 -40 412.48 1263.4 333.7 87 371.2

Apr 2025 1025 17.2 1060.05 8427 -284 409.96 1245.1 379.6 87 370.4

May 2025 1005 16.4 1056.01 8123 -303 406.10 1224.6 365.8 87 363.9

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3226 Processed On: 6/9/2023 1:03:34PM 
Most Probable Inflow*

June 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

* Jun 2022 842 14.1 643.47 1712 3 139.18 251.6 108.5 99 128.9

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

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

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

WY 2022 8495 1074.5

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

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

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

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

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

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

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

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

Jun 2023 830 13.9 643.00 1699 32 139.04 249.9 103.9 98 125.3

Jul 2023 807 13.1 642.50 1685 -14 139.67 255.0 101.5 100 125.8

Aug 2023 717 11.7 642.00 1671 -14 139.73 255.0 90.3 100 125.9

Sep 2023 678 11.4 640.01 1617 -54 138.58 255.0 84.7 100 124.9

WY 2023 7681 975.7

Oct 2023 656 10.7 633.00 1434 -183 134.37 227.0 79.4 89 121.1

Nov 2023 518 8.7 635.00 1486 51 132.69 159.8 61.9 63 119.5

Dec 2023 367 6.0 639.51 1604 118 137.19 154.7 45.4 61 123.6

Jan 2024 505 8.2 641.80 1666 62 139.55 156.3 63.5 61 125.7

Feb 2024 538 9.4 641.80 1666 0 140.21 160.0 68.0 63 126.3

Mar 2024 849 13.8 643.05 1700 34 139.10 194.1 106.4 76 125.3

Apr 2024 1004 16.9 643.00 1699 -2 138.64 249.9 125.5 98 124.9

May 2024 982 16.0 643.00 1699 0 138.92 255.0 122.9 100 125.2

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

Jul 2024 780 12.7 642.00 1671 -27 139.58 255.0 98.1 100 125.8

Aug 2024 717 11.7 642.00 1671 0 139.48 255.0 90.1 100 125.7

Sep 2024 701 11.8 640.01 1617 -54 138.44 255.0 87.5 100 124.7

WY 2024 8478 1056.7

Oct 2024 641 10.4 633.00 1434 -183 134.48 227.0 77.6 89 121.2

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

Dec 2024 388 6.3 639.51 1604 118 137.03 154.7 47.9 61 123.5

Jan 2025 501 8.2 641.80 1666 62 139.59 156.3 63.0 61 125.8

Feb 2025 534 9.6 641.80 1666 0 140.10 156.6 67.4 61 126.2

Mar 2025 844 13.7 643.05 1700 34 139.13 194.1 105.8 76 125.3

Apr 2025 1000 16.8 643.00 1699 -2 138.67 249.9 124.9 98 124.9

May 2025 978 15.9 643.00 1699 0 138.94 255.0 122.4 100 125.2

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3226 Processed On: 6/9/2023 1:03:34PM 
Most Probable Inflow*

June 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

* Jun 2022 679 11.4 448.30 586 -7 78.23 120.0 47.2 100 69.4

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

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

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

WY 2022 6231 431.0

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

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

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

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

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

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

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

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

Jun 2023 674 11.3 448.00 580 33 77.48 120.0 46.5 100 69.0

Jul 2023 709 11.5 448.00 580 0 78.28 120.0 49.2 100 69.4

Aug 2023 625 10.2 447.50 571 -9 78.56 120.0 43.4 100 69.4

Sep 2023 535 9.0 447.50 570 0 78.82 120.0 37.1 100 69.3

WY 2023 6043 417.8

Oct 2023 466 7.6 447.50 571 0 79.46 91.0 32.8 76 70.3

Nov 2023 353 5.9 447.50 570 0 80.26 92.0 24.3 77 68.8

Dec 2023 251 4.1 446.50 552 -19 80.76 112.3 16.0 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 6416 444.1

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

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3226 Processed On: 6/9/2023 1:03:34PM 
Most Probable Inflow*

June 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 

* Jun 2022 222 41 18 25 16 6

H Jul 2022 251 29 23 29 17 7

I Aug 2022 265 39 23 31 18 6

S Sep 2022 201 42 14 27 13 5

Summer 2022 1332 222 108 160 92 28

T Oct 2022 175 42 0 21 10 2

O Nov 2022 181 38 0 6 2 1

R Dec 2022 199 40 1 6 2 4

I Jan 2023 182 41 4 5 2 4

C Feb 2023 172 37 5 6 0 1

A Mar 2023 173 23 4 6 0 3

Winter 2023 1083 220 15 49 16 15

L Apr 2023 291 17 5 9 3 4

* May 2023 412 18 21 40 20 7

Jun 2023 420 55 37 48 22 8

Jul 2023 466 29 39 48 23 7

Aug 2023 456 33 32 38 19 7

Sep 2023 326 35 8 36 18 5

Summer 2023 2372 186 143 219 107 37

Oct 2023 191 20 22 27 9 5

Nov 2023 199 19 16 19 10 4

Dec 2023 238 26 24 30 15 4

Jan 2024 285 26 12 16 9 4

Feb 2024 250 25 12 15 8 3

Mar 2024 263 29 13 17 9 3

Winter 2024 1425 145 99 125 60 24

Apr 2024 235 28 13 20 12 2

May 2024 239 76 17 31 22 5

Jun 2024 258 21 37 50 22 7

Jul 2024 296 24 33 40 21 8

Aug 2024 315 35 35 41 21 7

Sep 2024 235 35 32 38 19 6

Summer 2024 1578 220 168 221 117 36

Oct 2024 265 24 26 32 10 4

Nov 2024 265 25 16 20 10 4

Dec 2024 293 40 23 28 14 4

Jan 2025 350 40 14 18 10 4

Feb 2025 306 36 13 17 9 3

Mar 2025 323 21 11 15 8 3

Winter 2025 1802 186 105 130 61 21

Apr 2025 286 20 12 19 11 2

May 2025 289 66 20 32 20 6

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3226 Processed On: 6/9/2023 1:03:34PM
Most Probable Inflow*

June 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 * * * *

Jun 2023 843 236 308 15426 16813 19625 36438 322 195 18 534 15426 19625 35585 1500 896 0 26.0

Jul 2023 597 56 380 13419 14452 19477 33929 55 -11 38 82 13419 19477 32978 1500 827 0 26.2

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

Aug 2023 558 65 399 13533 14554 19202 33755 558 65 399 1021 13533 19202 33755 1500 735 0 25.9

Sep 2023 598 99 426 14071 15195 18830 34025 598 99 426 1124 14071 18830 34025 2270 647 0 25.5

Oct 2023 663 149 432 14369 15613 18675 34289 663 149 432 1245 14369 18675 34289 3040 498 0 25.4

Nov 2023 673 178 422 14300 15574 18685 34259 673 178 422 1274 14300 18685 34259 3810 598 0 25.3

Dec 2023 679 189 415 14304 15587 18771 34358 679 189 415 1284 14304 18771 34358 4580 500 0 25.3

Jan 2024 723 242 412 14414 15790 18653 34443 723 242 412 1377 14414 18653 34443 5350 587 0 25.2

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

Jan 2024 723 242 412 14414 15790 18653 34443 394 242 160 796 14414 18653 33863 5350 587 0 25.2

Feb 2024 758 258 413 14693 16122 18488 34610 427 258 161 846 14693 18488 34027 1500 559 0 25.1

Mar 2024 785 274 410 14861 16329 18374 34704 452 274 156 881 14861 18374 34117 1500 903 0 24.9

Apr 2024 774 281 383 14980 16417 18534 34951 436 281 122 839 14980 18534 34353 1500 1029 0 24.9

May 2024 736 260 323 14809 16128 18925 35053 393 260 39 691 14809 18925 34425 1500 1010 0 25.9

Jun 2024 768 120 367 13454 14710 19333 34043 420 120 43 583 13454 19333 33370 1500 895 0 27.2

Jul 2024 490 13 404 12212 13120 19634 32754 123 -10 25 138 12212 19634 31984 1500 787 0 27.1

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

Aug 2024 387 17 439 12184 13026 19728 32755 387 17 439 842 12184 19728 32755 1500 749 0 26.7

Sep 2024 434 67 470 12457 13428 19717 33145 434 67 470 971 12457 19717 33145 2270 670 0 26.3

Oct 2024 505 125 476 12559 13665 19818 33483 505 125 476 1106 12559 19818 33483 3040 483 0 26.1

Nov 2024 529 175 470 12705 13879 19660 33540 529 175 470 1174 12705 19660 33540 3810 588 0 26.0

Dec 2024 556 194 470 12857 14078 19602 33680 556 194 470 1221 12857 19602 33680 4580 521 0 25.9

Jan 2025 640 244 474 13082 14440 19391 33831 640 244 474 1358 13082 19391 33831 5350 583 0 25.8

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

Jan 2025 640 244 474 13082 14440 19391 33831 358 216 228 802 13082 19391 33276 5350 583 0 25.8

Feb 2025 717 267 478 13465 14927 19097 34024 435 240 232 907 13465 19097 33469 1500 554 0 25.7

Mar 2025 782 286 474 13735 15276 18869 34145 499 261 226 986 13735 18869 33590 1500 899 0 25.5

Apr 2025 763 287 428 13990 15468 18909 34377 475 263 174 912 13990 18909 33811 1500 1025 0 25.4

May 2025 717 256 365 13976 15313 19193 34506 424 227 88 739 13976 19193 33908 1500 1005 0 26.3

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3226 Processed On: 6/9/2023 1:03:34PM