Subject: September 2023 Most Probable 24-Month Study

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

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

Operating Plan (AOP). Pursuant to the Interim Guidelines, the August 2022 24-Month Study projections of the January 1, 2023, system storage and reservoir 

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

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

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

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

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

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

Reclamation will monitor system conditions daily and adjust the monthly release volume as necessary to balance the contents of Lake Powell and Lake Mead as 

closely as practicable by the end of the water year. 

Consistent with this operating approach and based on the most probable inflow forecast, the September 2023 24-Month Study projects a balancing release of 8.65

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

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

Lake Mead. 

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

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

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

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

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

of prior DROA releases from the units upstream of Powell. 

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

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

To: All Annual Operating Plan Recipients

From: Noe Santos, P.E.

River Operations Manager

Boulder Canyon Operations Office

Interior Region 8: Lower Colorado Basin

 Email: nsantos@usbr.gov 

 

From: Alex Pivarnik

Supervisor, River Operations Group

Upper Colorado Operations Office

Interior Region 7: Upper Colorado Basin

 Email: apivarnik@usbr.gov 
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.

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

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

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

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

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

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

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

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

The August 2023 24-Month Study projected the January 1, 2024 Lake Mead elevation to be below 1,075 feet and above 1,050 feet. Consistent with 

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

addition, Section III.B of Exhibit 1 to the Lower Basin DCP Agreement will also govern the operation of Lake Mead for CY 2024. Lower Basin projections for Lake 

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

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

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

inflow into Lake Powell for the month of August was 0.307 maf or 82% of the 30-year average from 1991 to 2020. The September 2023 unregulated inflow forecast 

for Lake Powell is 0.40 maf or 116% of the 30-year average. The observed 2023 April through July unregulated inflow is 10.62 maf or 166% of average.

In this study, the CY 2023 diversion for Metropolitan Water District of Southern California (MWD) is projected to be 0.69maf. The CY 2023 diversion for the Central 

Arizona Project (CAP) is projected to be 0.84 maf. Consumptive use for Nevada above Hoover (SNWP Use) is projected to be 0.38 maf for CY 2023. 

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

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

changes in the projections.

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

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

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

Reservoir Observed Inflow (kaf) Aug Inflow Forecast (kaf) Observed

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

Lake Powell 4520 3646 1054 304 81% 400 525 515 10619 166%

Fontenelle 323 412 141 74 114% 45 50 45 951 129%

Flaming Gorge 521 574 174 95 132% 55 60 56 1457 151%

Blue Mesa 327 312 117 49 85% 39 38 33 833 131%

Morrow Point 364 331 121 49 82% 41 40 35 901 131%

Crystal 406 357 128 52 79% 43 45 40 988 128%

Taylor Park 39 50 22 8.8 93% 7.5 7 5.5 118 126%

Vallecito 119 75 22 10.6 64% 9 10 8 252 142%

Navajo 488 249 46 -3.1 -99% 9 30 31 1028 163%

Lemon 32 23 4.9 2 51% 1.8 1.7 1.3 67 140%

McPhee 249 108 23 10 76% 8 6 4.5 527 207%

Ridgway 30 41 28 11.2 84% 7 6.7 5.4 110 120%

Deerlodge 1043 516 77 22 116% 22 35 35 2002 168%

Durango 218 178 75 23 71% 18 20 17 532 138%

The draft 2024 AOP is available online at:

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

The 2023 AOP is available online at:

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

The Interim Guidelines are available online at:

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

The Colorado River DCPs are available online at:

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

The 2021 Lower Basin MOU is available online at: 

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

The Upper Basin DROA is online at:

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

The Upper Basin Hydrology Summary is available online at:

https://www.usbr.gov/uc/water/crsp/studies/24Month_09_ucb.pdf. 

Information on the LC Conservation Program is available online at: 

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

September 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)

* Sep 2022 29 2 61 0 61 6498.08 274

WY 2022 744 15 617 67 685

H Oct 2022 40 1 22 39 61 6494.58 249

I Nov 2022 33 1 10 48 58 6490.90 224

S Dec 2022 28 1 56 2 58 6486.14 194

T Jan 2023 32 1 58 0 59 6481.53 167

O Feb 2023 28 0 10 43 53 6476.59 141

R Mar 2023 29 0 55 3 58 6470.02 113

I Apr 2023 75 1 61 0 61 6473.29 126

C May 2023 323 1 102 95 198 6494.66 250

A Jun 2023 412 2 92 269 361 6501.41 299

L Jul 2023 141 3 86 41 127 6502.91 310

* Aug 2023 74 2 71 3 74 6502.60 308

Sep 2023 45 2 71 0 71 6498.81 280

WY 2023 1260 15 694 544 1239

Oct 2023 50 1 68 0 68 6496.20 261

Nov 2023 45 1 67 0 67 6492.88 238

Dec 2023 35 1 71 0 71 6487.35 201

Jan 2024 32 1 71 0 71 6480.64 162

Feb 2024 30 0 66 0 66 6473.06 125

Mar 2024 48 0 69 0 69 6467.85 104

Apr 2024 75 1 34 18 53 6473.16 126

May 2024 150 1 97 0 97 6483.39 177

Jun 2024 295 2 103 90 192 6498.56 278

Jul 2024 170 3 102 21 123 6504.41 322

Aug 2024 65 2 92 0 92 6500.53 292

Sep 2024 40 2 71 0 71 6496.05 260

WY 2024 1035 15 911 130 1040

Oct 2024 46 1 0 55 55 6494.56 249

Nov 2024 42 1 0 62 62 6491.59 229

Dec 2024 32 1 20 49 69 6485.72 191

Jan 2025 31 1 69 0 69 6478.81 152

Feb 2025 29 0 62 0 62 6471.43 118

Mar 2025 51 0 56 0 56 6470.06 113

Apr 2025 77 1 38 8 46 6476.92 143

May 2025 166 1 92 0 92 6489.54 215

Jun 2025 301 2 105 117 222 6500.47 292

Jul 2025 146 3 101 17 118 6503.83 317

Aug 2025 59 2 78 0 78 6501.04 296

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3234 Processed On: 9/11/2023 9:40:30AM 
Most Probable Inflow*

September 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)

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

WY 2022 897 837 70 927 60 987 2138

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

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

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

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

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

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

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

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

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

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

* Aug 2023 95 93 13 112 0 112 126 6030.69 3292 146

Sep 2023 55 81 11 110 0 110 125 6029.69 3253 132

WY 2023 1836 1815 75 1096 48 1143 3372

Oct 2023 60 78 7 100 0 100 124 6028.94 3224 135

Nov 2023 56 78 3 97 0 97 123 6028.37 3203 132

Dec 2023 39 75 2 123 0 123 121 6027.04 3155 155

Jan 2024 45 84 2 123 0 123 119 6025.94 3116 153

Feb 2024 49 85 2 115 0 115 118 6025.07 3085 145

Mar 2024 100 121 3 74 0 74 120 6026.27 3128 146

Apr 2024 125 103 5 71 0 71 121 6026.99 3154 316

May 2024 215 162 7 183 0 183 120 6026.23 3126 748

Jun 2024 400 297 10 233 0 233 122 6027.70 3179 633

Jul 2024 200 153 13 79 0 79 124 6029.30 3238 144

Aug 2024 70 97 13 106 0 106 123 6028.77 3218 124

Sep 2024 46 77 11 104 0 104 122 6027.77 3181 122

WY 2024 1405 1410 77 1408 0 1408 2953

Oct 2024 54 63 7 72 0 72 121 6027.35 3167 105

Nov 2024 51 71 3 63 0 63 122 6027.48 3171 97

Dec 2024 34 71 2 97 0 97 120 6026.73 3144 122

Jan 2025 42 80 2 97 0 97 120 6026.23 3126 122

Feb 2025 43 76 2 88 0 88 119 6025.86 3114 113

Mar 2025 85 90 3 61 0 61 120 6026.57 3138 135

Apr 2025 111 80 5 60 0 60 121 6027.00 3154 263

May 2025 239 165 7 196 0 196 119 6025.96 3117 709

Jun 2025 389 310 10 94 0 94 127 6031.28 3315 461

Jul 2025 161 133 14 75 0 75 129 6032.37 3357 135

Aug 2025 66 85 13 106 0 106 128 6031.54 3325 125

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3234 Processed On: 9/11/2023 9:40:30AM 
Most Probable Inflow*

September 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)

* Sep 2022 5 8 9308.87 68

WY 2022 110 100

H Oct 2022 6 6 9308.80 68

I Nov 2022 4 5 9308.13 67

S Dec 2022 5 5 9307.68 66

T Jan 2023 4 5 9307.08 65

O Feb 2023 4 5 9306.26 64

R Mar 2023 4 5 9305.50 63

I Apr 2023 7 9 9304.30 61

C May 2023 39 20 9316.35 80

A Jun 2023 50 28 9328.01 102

L Jul 2023 22 26 9326.25 99

* Aug 2023 9 21 9319.91 87

Sep 2023 8 18 9314.45 77

WY 2023 162 153

Oct 2023 7 9 9313.43 75

Nov 2023 6 6 9313.46 76

Dec 2023 6 6 9313.37 75

Jan 2024 5 6 9312.68 74

Feb 2024 5 6 9312.34 74

Mar 2024 5 6 9311.64 73

Apr 2024 9 9 9311.64 73

May 2024 29 15 9319.77 87

Jun 2024 41 21 9330.16 107

Jul 2024 16 24 9326.14 99

Aug 2024 8 18 9320.87 89

Sep 2024 6 18 9314.05 77

WY 2024 143 144

Oct 2024 6 9 9312.25 74

Nov 2024 5 5 9312.22 73

Dec 2024 4 5 9311.45 72

Jan 2025 5 5 9311.33 72

Feb 2025 4 5 9310.83 71

Mar 2025 5 5 9310.71 71

Apr 2025 9 8 9311.64 73

May 2025 26 14 9318.94 85

Jun 2025 40 18 9330.40 107

Jul 2025 15 24 9325.89 98

Aug 2025 8 18 9320.59 88

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3234 Processed On: 9/11/2023 9:40:30AM 
Most Probable Inflow*

September 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)

* Sep 2022 31 33 1 55 28 82 7446.72 292

WY 2022 661 652 6 566 28 595

H Oct 2022 32 32 0 0 58 58 7441.74 266

I Nov 2022 26 27 0 1 10 11 7444.87 282

S Dec 2022 24 25 0 6 10 17 7446.44 290

T Jan 2023 24 25 0 20 0 20 7447.43 295

O Feb 2023 20 21 0 20 0 20 7447.61 296

R Mar 2023 25 26 0 19 0 19 7448.79 303

I Apr 2023 77 79 1 23 0 23 7458.56 358

C May 2023 327 309 1 77 0 77 7491.44 589

A Jun 2023 312 290 1 106 6 131 7510.36 747

L Jul 2023 117 120 1 125 1 126 7509.50 739

* Aug 2023 49 61 1 105 0 105 7504.26 694

Sep 2023 39 49 1 27 68 95 7498.59 647

WY 2023 1073 1064 8 529 153 701

Oct 2023 38 40 1 68 0 68 7495.06 618

Nov 2023 33 33 0 32 0 32 7495.10 618

Dec 2023 29 29 0 48 0 48 7492.67 599

Jan 2024 26 27 0 42 0 42 7490.74 583

Feb 2024 23 24 0 41 0 41 7488.47 566

Mar 2024 36 37 0 43 0 43 7487.65 559

Apr 2024 70 70 1 61 0 61 7488.68 567

May 2024 205 191 1 204 14 218 7485.02 539

Jun 2024 250 230 1 51 0 51 7507.00 717

Jul 2024 93 101 2 86 0 86 7508.53 731

Aug 2024 53 63 1 95 0 95 7504.66 697

Sep 2024 34 46 1 92 0 92 7499.10 651

WY 2024 890 891 9 864 14 878

Oct 2024 35 38 1 68 0 68 7495.39 620

Nov 2024 31 31 0 36 0 36 7494.69 615

Dec 2024 26 27 0 52 0 52 7491.50 589

Jan 2025 25 25 0 49 0 49 7488.38 565

Feb 2025 23 24 0 44 0 44 7485.72 545

Mar 2025 38 38 0 40 0 40 7485.44 543

Apr 2025 78 77 1 54 0 54 7488.24 564

May 2025 204 192 1 204 28 232 7482.76 522

Jun 2025 251 229 1 63 0 63 7503.42 687

Jul 2025 86 95 1 84 0 84 7504.60 697

Aug 2025 55 65 1 87 0 87 7501.81 673

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3234 Processed On: 9/11/2023 9:40:30AM 
Most Probable Inflow*

September 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)

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

WY 2022 685 595 24 619 614 0 614

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

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

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

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

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

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

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

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

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

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

* Aug 2023 49 105 0 105 105 0 105 7152.17 111

Sep 2023 41 95 2 97 96 0 96 7153.73 112

WY 2023 1151 701 78 779 773 2 781

Oct 2023 40 68 2 70 70 0 70 7153.73 112

Nov 2023 35 32 2 34 34 0 34 7153.73 112

Dec 2023 31 48 2 50 50 0 50 7153.73 112

Jan 2024 28 42 2 44 44 0 44 7153.73 112

Feb 2024 25 41 2 43 43 0 43 7153.73 112

Mar 2024 40 43 4 47 47 0 47 7153.73 112

Apr 2024 80 61 10 71 71 0 71 7153.73 112

May 2024 230 218 25 243 243 0 243 7153.73 112

Jun 2024 270 51 20 71 71 0 71 7153.72 112

Jul 2024 99 86 6 92 92 0 92 7153.73 112

Aug 2024 56 95 3 98 98 0 98 7153.73 112

Sep 2024 36 92 2 94 94 0 94 7153.73 112

WY 2024 970 878 80 958 957 0 957

Oct 2024 37 68 2 70 70 0 70 7153.73 112

Nov 2024 32 36 1 37 37 0 37 7153.73 112

Dec 2024 27 52 1 53 53 0 53 7153.73 112

Jan 2025 26 49 1 50 50 0 50 7153.73 112

Feb 2025 25 44 2 46 46 0 46 7153.73 112

Mar 2025 40 40 2 42 42 0 42 7153.73 112

Apr 2025 89 54 11 65 65 0 65 7153.73 112

May 2025 226 232 22 254 254 0 254 7153.73 112

Jun 2025 265 63 14 77 77 0 77 7153.72 112

Jul 2025 90 84 4 88 87 0 87 7153.73 112

Aug 2025 56 87 1 88 88 0 88 7153.73 112

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3234 Processed On: 9/11/2023 9:40:30AM 
Most Probable Inflow*

September 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)

* 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

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

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

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

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

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

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

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

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

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

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

* Aug 2023 52 105 3 108 108 0 108 6751.75 17 66 44

Sep 2023 43 96 2 98 97 0 97 6753.04 17 55 42

WY 2023 1257 781 106 887 691 167 886 366 543

Oct 2023 45 70 5 75 52 23 75 6753.04 17 55 20

Nov 2023 40 34 5 39 39 0 39 6753.04 17 0 39

Dec 2023 36 50 5 55 55 0 55 6753.04 17 0 55

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

Feb 2024 28 43 3 46 46 0 46 6753.04 17 0 46

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

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

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

Jun 2024 305 71 35 106 106 0 106 6753.03 17 61 45

Jul 2024 110 92 11 103 103 0 103 6753.04 17 65 38

Aug 2024 61 98 5 103 103 0 103 6753.04 17 65 38

Sep 2024 39 94 3 97 96 0 96 6753.04 17 55 41

WY 2024 1100 957 130 1087 920 166 1087 410 677

Oct 2024 41 70 4 74 56 17 74 6753.04 17 55 19

Nov 2024 36 37 4 41 41 0 41 6753.04 17 0 41

Dec 2024 32 53 5 58 58 0 58 6753.04 17 0 58

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

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

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

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

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

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

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

Aug 2025 63 88 7 95 95 0 95 6753.04 17 65 30

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3234 Processed On: 9/11/2023 9:40:30AM 
Most Probable Inflow*

September 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)

* Sep 2022 12 26 7630.15 45

WY 2022 185 160

H Oct 2022 14 3 7635.84 56

I Nov 2022 7 0 7639.00 62

S Dec 2022 5 0 7641.15 67

T Jan 2023 5 0 7643.44 72

O Feb 2023 5 2 7644.74 75

R Mar 2023 7 36 7630.44 46

I Apr 2023 36 45 7625.05 36

C May 2023 119 64 7651.55 91

A Jun 2023 75 41 7664.54 124

L Jul 2023 22 37 7658.55 108

* Aug 2023 11 38 7647.43 81

Sep 2023 10 29 7638.94 62

WY 2023 315 295

Oct 2023 10 17 7635.30 55

Nov 2023 7 2 7637.85 60

Dec 2023 6 2 7639.81 64

Jan 2024 5 2 7641.25 67

Feb 2024 5 2 7642.71 70

Mar 2024 9 2 7645.81 77

Apr 2024 21 2 7653.70 96

May 2024 61 39 7662.21 118

Jun 2024 56 65 7658.75 109

Jul 2024 19 41 7649.51 86

Aug 2024 14 38 7638.78 62

Sep 2024 14 29 7630.79 46

WY 2024 227 240

Oct 2024 12 16 7628.16 42

Nov 2024 9 2 7632.17 49

Dec 2024 7 2 7634.85 54

Jan 2025 6 2 7636.92 58

Feb 2025 5 2 7638.50 61

Mar 2025 10 2 7642.24 69

Apr 2025 23 2 7651.26 90

May 2025 68 42 7661.13 115

Jun 2025 62 62 7660.77 114

Jul 2025 21 42 7652.48 93

Aug 2025 15 38 7642.53 70

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3234 Processed On: 9/11/2023 9:40:30AM 
Most Probable Inflow*

September 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)

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

WY 2022 574 66 484 20 200 296 595

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

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

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

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

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

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

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

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

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

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

* Aug 2023 -3 1 23 3 42 42 6052.15 1196 48

Sep 2023 26 0 44 3 24 38 6050.45 1176 56

WY 2023 1244 144 1079 24 194 556 1216

Oct 2023 29 1 35 2 9 21 6050.75 1180 38

Nov 2023 26 1 20 1 0 18 6050.84 1181 32

Dec 2023 21 0 16 1 0 18 6050.62 1178 31

Jan 2024 19 0 16 1 0 18 6050.33 1175 30

Feb 2024 26 1 22 1 0 17 6050.64 1179 28

Mar 2024 83 5 70 2 6 18 6054.42 1223 38

Apr 2024 132 16 97 2 21 18 6058.91 1279 64

May 2024 226 32 172 4 36 18 6067.64 1393 139

Jun 2024 168 23 153 5 52 18 6073.31 1472 148

Jul 2024 29 2 50 5 55 29 6070.52 1433 75

Aug 2024 21 2 43 4 46 32 6067.67 1393 58

Sep 2024 28 1 42 3 25 76 6063.06 1332 100

WY 2024 808 85 736 28 250 302 782

Oct 2024 33 2 36 2 9 19 6063.58 1339 41

Nov 2024 29 1 21 1 0 18 6063.74 1341 35

Dec 2024 24 0 19 1 0 18 6063.71 1340 33

Jan 2025 22 0 18 1 0 18 6063.60 1339 31

Feb 2025 29 1 25 1 0 17 6064.14 1346 29

Mar 2025 92 10 74 2 5 18 6067.75 1394 41

Apr 2025 147 18 107 3 21 18 6072.50 1460 69

May 2025 251 34 191 4 35 229 6066.94 1383 364

Jun 2025 187 25 163 4 51 232 6057.33 1259 376

Jul 2025 33 2 51 4 55 29 6054.28 1222 80

Aug 2025 24 1 45 3 47 33 6051.12 1184 62

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3234 Processed On: 9/11/2023 9:40:30AM 
Most Probable Inflow*

September 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)

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

WY 2022 6084 6107 203 6999 0 6999 7066

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

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

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

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

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

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

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

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

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

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

* Aug 2023 307 454 39 902 0 902 3574.71 4764 8878 914

Sep 2023 400 545 35 544 0 544 3574.31 4761 8847 559

WY 2023 13598 12174 230 8560 90 8651 8827

Oct 2023 525 597 24 480 0 480 3575.42 4768 8933 496

Nov 2023 515 548 24 500 0 500 3575.71 4770 8955 505

Dec 2023 400 501 19 600 0 600 3574.30 4761 8846 603

Jan 2024 380 474 6 723 0 723 3571.22 4743 8610 727

Feb 2024 425 501 6 639 0 639 3569.46 4732 8477 650

Mar 2024 590 517 10 675 0 675 3567.38 4719 8322 689

Apr 2024 950 811 16 601 0 601 3569.78 4734 8501 618

May 2024 2200 2041 20 599 0 599 3586.43 4839 9817 620

Jun 2024 2450 2008 36 628 0 628 3600.78 4939 11062 645

Jul 2024 850 779 47 709 0 709 3601.02 4940 11083 724

Aug 2024 365 502 46 758 0 758 3597.90 4918 10803 772

Sep 2024 350 539 42 568 0 568 3597.16 4913 10738 584

WY 2024 10000 9819 297 7480 0 7480 7633

Oct 2024 447 493 29 643 0 643 3595.28 4899 10572 659

Nov 2024 466 473 28 642 0 642 3593.19 4885 10390 647

Dec 2024 361 445 22 715 0 715 3590.05 4863 10120 718

Jan 2025 350 426 6 857 0 857 3585.19 4831 9715 861

Feb 2025 397 452 7 752 6 758 3581.63 4808 9425 769

Mar 2025 614 534 11 801 0 801 3578.41 4787 9168 815

Apr 2025 920 755 18 713 0 713 3578.70 4789 9190 730

May 2025 2060 2093 22 710 0 710 3593.89 4890 10451 731

Jun 2025 2423 2061 39 745 0 745 3606.98 4984 11633 762

Jul 2025 711 676 48 842 0 842 3604.85 4968 11434 857

Aug 2025 371 500 47 900 0 900 3600.32 4935 11020 914

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3234 Processed On: 9/11/2023 9:40:30AM 
Most Probable Inflow*

September 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)

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

WY 2022 6999 787 463 8899 222 8888

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

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

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

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

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

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

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

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

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

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

* Aug 2023 902 114 54 580 9.4 27 579 574 1065.35 8834

Sep 2023 544 72 53 509 8.6 39 509 575 1065.52 8847

WY 2023 8651 1286 458 7649 212 7565

Oct 2023 480 77 50 509 8.3 75 509 570 1064.59 8775

Nov 2023 500 63 44 602 10.1 62 602 562 1062.84 8640

Dec 2023 600 72 35 363 5.9 61 363 575 1065.42 8839

Jan 2024 723 75 25 549 8.9 11 549 588 1067.99 9040

Feb 2024 639 71 23 533 9.3 8 533 597 1069.72 9177

Mar 2024 675 97 25 877 14.3 14 877 588 1068.00 9042

Apr 2024 601 60 34 1002 16.8 16 1002 564 1063.30 8675

May 2024 599 37 41 982 16.0 20 982 539 1058.27 8292

Jun 2024 628 22 50 892 15.0 28 892 519 1054.23 7992

Jul 2024 709 55 47 786 12.8 32 786 513 1052.93 7896

Aug 2024 758 86 51 749 12.2 34 749 514 1053.06 7906

Sep 2024 568 72 50 647 10.9 30 647 509 1051.95 7824

WY 2024 7480 786 475 8490 391 8490

Oct 2024 643 77 47 459 7.5 24 459 520 1054.37 8002

Nov 2024 642 63 42 585 9.8 14 585 524 1055.19 8063

Dec 2024 715 72 34 517 8.4 9 517 538 1058.05 8276

Jan 2025 857 75 24 566 9.2 10 566 558 1062.15 8587

Feb 2025 758 71 23 537 9.7 7 537 574 1065.34 8833

Mar 2025 801 97 25 881 14.3 13 881 573 1065.08 8813

Apr 2025 713 60 33 1006 16.9 15 1006 556 1061.66 8549

May 2025 710 37 41 986 16.0 19 986 537 1057.95 8268

Jun 2025 745 22 50 896 15.1 26 896 525 1055.36 8075

Jul 2025 842 55 48 791 12.9 30 791 527 1055.72 8102

Aug 2025 900 86 52 753 12.2 32 753 536 1057.59 8242

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3234 Processed On: 9/11/2023 9:40:30AM 
Most Probable Inflow*

September 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)

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

WY 2022 8899 -222 151 8494 0 8494

H Oct 2022 418 -2 14 541 0 541 8.8 633.78 1454

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

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

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

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

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

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

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

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

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

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

Sep 2023 509 -6 16 591 0 591 9.9 639.01 1591

WY 2023 7649 -107 152 7353 0 7394

Oct 2023 509 -11 14 563 0 563 9.2 636.00 1512

Nov 2023 602 -16 13 467 0 467 7.8 640.01 1618

Dec 2023 363 -2 13 349 0 349 5.7 640.01 1617

Jan 2024 549 -11 9 480 0 480 7.8 641.80 1666

Feb 2024 533 -13 8 513 0 513 8.9 641.80 1666

Mar 2024 877 -10 10 822 0 822 13.4 643.05 1700

Apr 2024 1002 -14 13 977 0 977 16.4 643.00 1699

May 2024 982 -13 14 954 0 954 15.5 643.00 1699

Jun 2024 892 -21 14 857 0 857 14.4 643.00 1699

Jul 2024 786 -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 647 -6 16 678 0 678 11.4 640.01 1617

WY 2024 8490 -154 151 8157 0 8157

Oct 2024 459 -11 14 617 0 617 10.0 633.00 1434

Nov 2024 585 -16 13 505 0 505 8.5 635.00 1486

Dec 2024 517 -2 13 384 0 384 6.3 639.51 1604

Jan 2025 566 -11 9 485 0 485 7.9 641.80 1666

Feb 2025 537 -13 8 517 0 517 9.3 641.80 1666

Mar 2025 881 -10 10 826 0 826 13.4 643.05 1700

Apr 2025 1006 -14 13 981 0 981 16.5 643.00 1699

May 2025 986 -13 14 959 0 959 15.6 643.00 1699

Jun 2025 896 -21 14 861 0 861 14.5 643.00 1699

Jul 2025 791 -21 12 784 0 784 12.8 642.00 1671

Aug 2025 753 -17 15 721 0 721 11.7 642.00 1671

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3234 Processed On: 9/11/2023 9:40:30AM 
Most Probable Inflow*

September 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)

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

WY 2022 8494 176 140 6231 1117 1112 1499

H Oct 2022 541 26 12 393 6.4 106 66 447.14 564 67 1.1

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

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

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

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

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

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

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

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

L Jul 2023 736 18 17 634 10.3 70 22 448.36 587 131 2.1

* Aug 2023 555 24 17 485 7.9 61 19 447.78 576 106 1.7

Sep 2023 591 12 15 488 8.2 42 53 447.50 570 91 1.5

WY 2023 7394 248 139 5756 815 865 1412

Oct 2023 563 21 12 462 7.5 42 61 447.50 571 68 1.1

Nov 2023 467 14 9 361 6.1 56 50 447.50 570 84 1.4

Dec 2023 349 17 7 259 4.2 58 57 446.50 552 84 1.4

Jan 2024 480 7 6 313 5.1 86 76 446.50 552 138 2.2

Feb 2024 513 4 8 411 7.1 8 84 446.50 552 124 2.2

Mar 2024 822 2 9 608 9.9 98 96 446.70 555 147 2.4

Apr 2024 977 7 11 727 12.2 89 109 448.70 593 147 2.5

May 2024 954 4 13 734 11.9 85 115 448.70 593 110 1.8

Jun 2024 857 10 16 714 12.0 82 44 448.70 593 116 2.0

Jul 2024 780 17 17 686 11.2 85 11 448.00 580 123 2.0

Aug 2024 717 19 17 621 10.1 85 11 447.50 571 102 1.7

Sep 2024 678 12 15 533 9.0 82 50 447.50 570 99 1.7

WY 2024 8157 134 139 6428 854 764 1342

Oct 2024 617 21 12 482 7.8 85 52 447.50 571 89 1.4

Nov 2024 505 14 9 375 6.3 82 48 447.50 570 115 1.9

Dec 2024 384 17 7 270 4.4 85 54 446.50 552 110 1.8

Jan 2025 485 7 6 313 5.1 90 76 446.50 552 138 2.2

Feb 2025 517 4 8 411 7.4 12 84 446.50 552 124 2.2

Mar 2025 826 2 9 608 9.9 102 97 446.70 555 147 2.4

Apr 2025 981 7 11 726 12.2 93 109 448.70 593 147 2.5

May 2025 959 4 13 733 11.9 89 115 448.70 593 110 1.8

Jun 2025 861 10 16 714 12.0 86 44 448.70 593 116 2.0

Jul 2025 784 17 17 686 11.2 89 11 448.00 580 123 2.0

Aug 2025 721 19 17 621 10.1 89 11 447.50 571 102 1.7

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3234 Processed On: 9/11/2023 9:40:30AM 
Most Probable Inflow*

September 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

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

WY 2022 8899 3240.9

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

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

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

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

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

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

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

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

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

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

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

Sep 2023 509 8.6 1065.52 8847 13 415.60 1160.0 185.7 79 364.7

WY 2023 7649 2763.2

Oct 2023 509 8.3 1064.59 8775 -72 420.25 776.4 195.0 53 382.9

Nov 2023 602 10.1 1062.84 8640 -135 418.59 776.4 229.4 53 381.1

Dec 2023 363 5.9 1065.42 8839 200 415.81 1047.0 131.2 71 361.2

Jan 2024 549 8.9 1067.99 9040 201 418.70 921.1 204.3 62 372.4

Feb 2024 533 9.3 1069.72 9177 137 419.53 1027.0 199.1 69 373.6

Mar 2024 877 14.3 1068.00 9042 -136 417.82 1203.0 336.2 81 383.5

Apr 2024 1002 16.8 1063.30 8675 -366 412.29 1446.0 369.2 100 368.6

May 2024 982 16.0 1058.27 8292 -383 407.49 1418.0 361.3 100 368.0

Jun 2024 892 15.0 1054.23 7992 -301 403.01 1390.0 321.8 100 360.8

Jul 2024 786 12.8 1052.93 7896 -96 400.69 1399.4 283.3 100 360.3

Aug 2024 749 12.2 1053.06 7906 10 400.43 1399.4 268.2 100 358.2

Sep 2024 647 10.9 1051.95 7824 -81 400.59 1386.6 228.9 100 353.8

WY 2024 8490 3127.9

Oct 2024 459 7.5 1054.37 8002 178 407.73 830.0 168.5 60 366.8

Nov 2024 585 9.8 1055.19 8063 60 411.63 830.0 217.5 60 371.6

Dec 2024 517 8.4 1058.05 8276 213 410.98 886.5 193.2 63 373.5

Jan 2025 566 9.2 1062.15 8587 312 412.25 899.4 208.5 63 368.3

Feb 2025 537 9.7 1065.34 8833 246 414.36 1029.7 199.3 70 371.0

Mar 2025 881 14.3 1065.08 8813 -20 413.65 1271.3 333.7 87 378.8

Apr 2025 1006 16.9 1061.66 8549 -264 411.40 1254.9 373.0 87 370.9

May 2025 986 16.0 1057.95 8268 -281 407.86 1236.4 359.4 87 364.6

Jun 2025 896 15.1 1055.36 8075 -193 404.76 1217.6 327.0 87 365.0

Jul 2025 791 12.9 1055.72 8102 27 402.62 1402.0 286.5 100 362.4

Aug 2025 753 12.2 1057.59 8242 140 404.06 1415.2 272.5 100 361.9

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3234 Processed On: 9/11/2023 9:40:30AM 
Most Probable Inflow*

September 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

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

WY 2022 8494 1074.5

H Oct 2022 541 8.8 633.78 1454 -141 134.35 185.9 66.9 73 123.5

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

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

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

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

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

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

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

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

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

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

Sep 2023 591 9.9 639.01 1591 -104 139.11 204.0 74.0 80 125.3

WY 2023 7353 938.8

Oct 2023 563 9.2 636.00 1512 -79 136.00 189.2 69.0 74 122.5

Nov 2023 467 7.8 640.01 1618 106 137.07 154.7 57.7 61 123.5

Dec 2023 349 5.7 640.01 1617 0 140.08 156.3 44.0 61 126.2

Jan 2024 480 7.8 641.80 1666 49 139.99 164.5 60.6 65 126.1

Feb 2024 513 8.9 641.80 1666 0 140.40 167.1 64.8 66 126.5

Mar 2024 822 13.4 643.05 1700 34 139.26 210.6 103.1 83 125.5

Apr 2024 977 16.4 643.00 1699 -2 138.79 255.0 122.2 100 125.0

May 2024 954 15.5 643.00 1699 0 139.07 255.0 119.6 100 125.3

Jun 2024 857 14.4 643.00 1699 0 139.46 255.0 107.7 100 125.6

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 90.0 100 125.7

Sep 2024 678 11.4 640.01 1617 -54 138.58 255.0 84.7 100 124.9

WY 2024 8157 1021.5

Oct 2024 617 10.0 633.00 1434 -183 134.64 227.0 74.9 89 121.3

Nov 2024 505 8.5 635.00 1486 51 132.78 159.8 60.5 63 119.6

Dec 2024 384 6.3 639.51 1604 118 137.05 154.7 47.5 61 123.5

Jan 2025 485 7.9 641.80 1666 62 139.71 156.3 61.0 61 125.9

Feb 2025 517 9.3 641.80 1666 0 140.23 156.6 65.3 61 126.3

Mar 2025 826 13.4 643.05 1700 34 139.23 194.1 103.7 76 125.4

Apr 2025 981 16.5 643.00 1699 -2 138.77 249.9 122.7 98 125.0

May 2025 959 15.6 643.00 1699 0 139.04 255.0 120.1 100 125.3

Jun 2025 861 14.5 643.00 1699 0 139.44 255.0 108.2 100 125.6

Jul 2025 784 12.8 642.00 1671 -27 139.56 255.0 98.6 100 125.7

Aug 2025 721 11.7 642.00 1671 0 139.46 255.0 90.6 100 125.6

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3234 Processed On: 9/11/2023 9:40:30AM 
Most Probable Inflow*

September 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

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

WY 2022 6231 431.0

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

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

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

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

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

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

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

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

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

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

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

Sep 2023 488 8.2 447.50 570 -5 79.31 120.0 34.1 100 69.7

WY 2023 5743 397.2

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

Nov 2023 361 6.1 447.50 570 0 80.19 81.0 24.8 68 68.7

Dec 2023 259 4.2 446.50 552 -19 80.68 60.0 16.5 50 63.7

Jan 2024 313 5.1 446.50 552 0 79.71 73.5 20.9 61 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 6428 444.9

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

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

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

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

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

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

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

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

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

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

Aug 2025 621 10.1 447.50 571 -10 78.59 120.0 43.1 100 69.4

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3234 Processed On: 9/11/2023 9:40:30AM 
Most Probable Inflow*

September 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 

* Sep 2022 201 42 14 27 13 5

Summer 2022 1332 222 108 160 92 28

H Oct 2022 175 42 0 21 10 2

I Nov 2022 181 38 0 6 2 1

S Dec 2022 199 40 1 6 2 4

T Jan 2023 182 41 4 5 2 4

O Feb 2023 172 37 5 6 0 1

R Mar 2023 173 23 4 6 0 3

Winter 2023 1083 220 15 49 16 15

I Apr 2023 291 17 5 9 3 4

C May 2023 412 18 21 40 20 7

A Jun 2023 439 43 32 50 22 8

L Jul 2023 483 29 38 45 22 8

* Aug 2023 374 44 31 37 21 6

Sep 2023 215 37 8 34 17 5

Summer 2023 2215 187 135 215 106 38

Oct 2023 190 34 21 25 9 5

Nov 2023 198 33 10 12 7 5

Dec 2023 237 42 14 18 10 5

Jan 2024 284 41 12 16 9 5

Feb 2024 250 39 12 16 8 4

Mar 2024 263 25 13 17 9 4

Winter 2024 1423 213 82 104 51 27

Apr 2024 234 24 18 26 14 2

May 2024 238 62 60 88 23 6

Jun 2024 258 78 15 25 18 7

Jul 2024 296 27 27 33 18 8

Aug 2024 315 36 29 35 18 7

Sep 2024 235 35 28 34 17 5

Summer 2024 1576 262 177 241 108 35

Oct 2024 265 24 20 25 10 0

Nov 2024 265 21 11 14 7 0

Dec 2024 292 33 16 19 10 1

Jan 2025 349 33 15 18 10 4

Feb 2025 304 30 13 17 9 4

Mar 2025 321 21 12 15 8 3

Winter 2025 1796 161 86 108 53 12

Apr 2025 285 20 16 24 13 2

May 2025 289 66 59 92 23 6

Jun 2025 312 32 19 28 18 8

Jul 2025 357 25 26 31 16 8

Aug 2025 377 36 27 32 16 6

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3234 Processed On: 9/11/2023 9:40:30AM
Most Probable Inflow*

September 2023 24-Month Study

Flood Control Criteria - Beginning of Month Conditions

OPERATION PLAN FOR COLORADO RIVER SYSTEM RESERVOIRS

Navajo

Date KAF

Flaming

Gorge

KAF

Blue

Mesa

KAF

Lake

Powell

KAF

Upper Basin

Total

KAF

Lake

Mead

KAF

Total

KAF

Flaming

Gorge

KAF

Blue

Mesa

KAF

Navajo

KAF

Lake

Powell

KAF

Tot or Max

Allow

KAF

Lake

Mead

KAF

Total

KAF

BOM Space

Required

KAF

Mead 

Sched Rel

KAF

Mead 

FC Rel

KAF

Sys

Cont

MAF

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

Sep 2023 411 131 452 14436 15430 18786 34216 411 131 452 994 14436 18786 34216 2270 509 0 25.4

Oct 2023 478 178 472 14467 15594 18773 34367 478 178 472 1128 14467 18773 34367 3040 509 0 25.3

Nov 2023 526 207 468 14381 15581 18845 34427 526 207 468 1201 14381 18845 34427 3810 602 0 25.2

Dec 2023 570 207 467 14358 15602 18980 34582 570 207 467 1243 14358 18980 34582 4580 363 0 25.2

Jan 2024 654 226 470 14468 15817 18781 34598 654 226 470 1350 14468 18781 34598 5350 549 0 25.1

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

Jan 2024 654 226 470 14468 15817 18781 34598 256 160 442 859 14468 18781 34107 5350 549 0 25.1

Feb 2024 733 241 473 14704 16151 18580 34730 334 177 445 956 14704 18580 34239 1500 533 0 25.0

Mar 2024 800 259 469 14836 16365 18443 34807 400 195 441 1035 14836 18443 34314 1500 877 0 24.8

Apr 2024 779 265 425 14992 16460 18578 35039 374 202 389 964 14992 18578 34534 1500 1002 0 24.8

May 2024 731 257 369 14813 16170 18945 35115 320 193 310 823 14813 18945 34580 1500 982 0 25.9

Jun 2024 707 285 255 13496 14744 19328 34071 288 206 156 651 13496 19328 33474 1500 892 0 27.2

Jul 2024 554 107 176 12252 13090 19628 32718 121 7 21 149 12252 19628 32029 1500 786 0 27.2

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

Aug 2024 451 94 215 12231 12991 19724 32715 451 94 215 761 12231 19724 32715 1500 749 0 26.8

Sep 2024 501 127 255 12511 13393 19714 33108 501 127 255 883 12511 19714 33108 2270 647 0 26.4

Oct 2024 570 174 316 12576 13636 19796 33432 570 174 316 1060 12576 19796 33432 3040 459 0 26.2

Nov 2024 595 204 309 12742 13850 19618 33468 595 204 309 1108 12742 19618 33468 3810 585 0 26.1

Dec 2024 611 210 307 12924 14052 19557 33609 611 210 307 1128 12924 19557 33609 4580 517 0 26.0

Jan 2025 675 235 308 13194 14412 19344 33756 675 235 308 1218 13194 19344 33756 5350 566 0 25.9

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

Jan 2025 675 235 308 13194 14412 19344 33756 399 139 68 605 13194 19344 33143 5350 566 0 25.9

Feb 2025 732 260 309 13599 14899 19033 33932 454 163 68 685 13599 19033 33317 1500 537 0 25.8

Mar 2025 779 280 302 13889 15249 18787 34036 499 184 60 743 13889 18787 33418 1500 881 0 25.6

Apr 2025 760 282 254 14146 15441 18807 34248 475 186 5 666 14146 18807 33619 1500 1006 0 25.6

May 2025 714 261 188 14123 15285 19071 34356 424 162 -84 501 14123 19071 33695 1500 986 0 26.5

Jun 2025 679 302 264 12863 14109 19352 33461 381 190 -47 525 12863 19352 32740 1500 896 0 27.8

Jul 2025 404 138 389 11681 12612 19545 32157 86 3 22 111 11681 19545 31337 1500 791 0 27.6

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

Aug 2025 336 128 426 11880 12770 19518 32288 336 128 426 890 11880 19518 32288 1500 753 0 27.2

* Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 3234 Processed On: 9/11/2023 9:40:30AM