All Annual Operating Plan Recipients

Transcription

1 To: All Annual Operating Plan Recipients From: Lower Colorado Region Boulder Canyon Operations Office River Operations Group Daniel Bunk P.O. Box 647 Boulder City, NV Phone: The operation of Lake Powell and Lake Mead in this August Month Study is pursuant to the December 27 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 26 Annual Operating Plan (AOP). Pursuant to the Interim Guidelines, the August Month Study projections of the January, 26, system storage and reservoir water surface elevations set the operational tier for the coordinated operation of Lake Powell and Lake Mead during 26. Consistent with Section 6.B of the Interim Guidelines, the Lake Powell operational tier for water year 26 is the Upper Elevation Balancing Tier. The April Month Study projected the end of water year elevation at Lake Powell to be above 3,575 feet above sea level (feet) and the end of water year elevation at Lake Mead to be below elevation,75 feet. Therefore, in accordance with Section 6.B.4 of the Interim Guidelines, Lake Powell operations shifted to balancing releases for the remainder of water year 26. Based on the most probable inflow forecast, this August 24-Month Study projects a balancing release of 9. maf in water year 26. Consistent with Section 2.B.5 of the Interim Guidelines, the Intentionally Created Surplus (ICS) Surplus Condition is the criterion governing the operation of Lake Mead for calendar year 26. The August Month Study projects the January, 27 Lake Powell elevation to be below the 27 Equalization Elevation of 3,652 feet and above elevation 3,575 feet. Consistent with Section 6.B of the Interim Guidelines, Lake Powell s operations in water year 27 will be governed by the Upper Elevation Balancing Tier, with an initial water year release volume of 8.23 maf and the potential for an April adjustment to equalization or balancing releases in April 27. Consistent with Section 6.B.4 of the Interim Guidelines, an April adjustment to balancing releases is currently projected to occur and Lake Powell is projected to release 9. maf in water year 27. The August Month Study projects the January, 27 Lake Mead elevation to be above,75 feet. Consistent with Section 2.B.5 of the Interim Guidelines, the ICS Surplus Condition is the criterion governing the operation of Lake Mead for calendar year 27. The operational tier determinations will be documented in the 27 AOP, which is currently in development. The Interim Guidelines are available for download at: The 26 AOP is available for download at: Current runoff projections into Lake Powell are provided by the National Weather Service s Colorado Basin River Forecast Center and are as follows: Observed unregulated inflow into Lake Powell for the month of July was.595 maf or 55 percent of the 3-year average from 98 to 2. The forecast for August unregulated inflow into Lake Powell is.35 maf or 7 percent of the 3-year average. The preliminary observed 26 April through July unregulated inflow is 6.6 maf or 92 percent of average. In this study, the calendar year 26 diversion for Metropolitan Water District of Southern California (MWD) is projected to be.33 maf. The calendar year 26 diversion for the Central Arizona Project (CAP) is projected to be.49 maf. Consumptive use for Nevada above Hoover (SNWP Use) is projected to be.22 maf for calendar year 26.

2 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 historical gross energy figures come from PO&M reports provided by the Lower Colorado Region s Management Office, Bureau of Reclamation, Boulder City, Nevada. Questions regarding these historical energy numbers can be directed to Larry Karr at (72)

3 * H I S T O R I C A L * Date Aug 25 Sep 25 WY 25 Oct 25 Nov 25 Dec 25 Jan 26 Feb 26 Mar 26 Apr 26 May 26 Jun 26 Jul 26 Regulated Evap Losses ( Ac-Ft) ( Ac-Ft) August Month Study ( Ac-Ft) Bypass ( Ac-Ft) ( Ac-Ft) Fontenelle Reservoir (Ft) Live ( Ac-Ft) Aug Sep WY Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep WY Oct Nov Dec Jan Feb Mar Apr May Jun Jul * Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 32 Processed On: 8/8/26 3:47:59PM

4 Date Unreg ( Ac-Ft) * Aug H Sep WY I Oct S Nov T Dec O Jan R Feb I Mar C Apr A May L Jun * Jul Aug Sep WY Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep WY August Month Study Reg Evap Losses ( Ac-Ft) ( Ac-Ft) ( Ac-Ft) Flaming Gorge Reservoir Bypass ( Ac-Ft) ( Ac-Ft) Bank ( Ac-Ft) (Ft) Live ( Ac-Ft) Jensen Flow ( Ac-Ft) Oct Nov Dec Jan Feb Mar Apr May Jun Jul * Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 32 Processed On: 8/8/26 3:47:59PM

5 Regulated ( Ac-Ft) August Month Study ( Ac-Ft) (Ft) Live ( Ac-Ft) Date * Aug H Sep WY I Oct S Nov T Dec O Jan R Feb I Mar C Apr A May L Jun * Jul Aug Sep WY Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep WY Oct Nov Dec Jan Feb Mar Apr May Jun Jul Taylor Park Reservoir * Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 32 Processed On: 8/8/26 3:47:59PM

6 August Month Study Blue Mesa Reservoir UnReg Regulated Evap Losses Bypass Live Date ( Ac-Ft) ( Ac-Ft) ( Ac-Ft) ( Ac-Ft) ( Ac-Ft) ( Ac-Ft) (Ft) ( Ac-Ft) * Aug H Sep WY I Oct S Nov T Dec O Jan R Feb I Mar C Apr A May L Jun * Jul Aug Sep WY Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep WY Oct Nov Dec Jan Feb Mar Apr May Jun Jul * Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 32 Processed On: 8/8/26 3:47:59PM

7 Date Unreg ( Ac-Ft) * Aug 25 6 H Sep WY I Oct S Nov 25 3 T Dec O Jan R Feb I Mar C Apr A May L Jun * Jul Aug Sep WY Oct Nov Dec Jan Feb 27 2 Mar Apr 27 7 May 27 2 Jun Jul Aug 27 5 Sep 27 4 WY 27 9 August Month Study Blue Mesa ( Ac-Ft) Side ( Ac-Ft) ( Ac-Ft) ( Ac-Ft) Morrow Point Reservoir Bypass ( Ac-Ft) ( Ac-Ft) (Ft) Live ( Ac-Ft) Oct Nov Dec Jan Feb Mar Apr May Jun Jul * Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 32 Processed On: 8/8/26 3:47:59PM

8 Unreg ( Ac-Ft) August Month Study Morrow ( Ac-Ft) Side ( Ac-Ft) ( Ac-Ft) ( Ac-Ft) Crystal Reservoir Bypass ( Ac-Ft) ( Ac-Ft) (Ft) Live ( Ac-Ft) Tunnel Flow ( Ac-Ft) Below Tunnel Flow ( Ac-Ft) Date * Aug H Sep WY I Oct S Nov T Dec O Jan R Feb I Mar C Apr A May L Jun * Jul Aug Sep WY Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep WY Oct Nov Dec Jan Feb Mar Apr May Jun Jul * Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 32 Processed On: 8/8/26 3:47:59PM

9 Regulated ( Ac-Ft) August Month Study ( Ac-Ft) (Ft) Live ( Ac-Ft) Date * Aug H Sep WY I Oct S Nov T Dec O Jan R Feb I Mar C Apr A May L Jun * Jul Aug Sep WY Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep WY Oct Nov Dec Jan Feb Mar Apr May Jun Jul Vallecito Reservoir * Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 32 Processed On: 8/8/26 3:47:59PM

10 * H I S T O R I C A L * Date Aug 25 Sep 25 WY 25 Oct 25 Nov 25 Dec 25 Jan 26 Feb 26 Mar 26 Apr 26 May 26 Jun 26 Jul 26 Mod Unreg ( Ac-Ft) August Month Study Azetea Tunnel Div ( Ac-Ft) Navajo Reservoir Reg Evap Losses NIIP Diversion Live Farmington Flow ( Ac-Ft) ( Ac-Ft) ( Ac-Ft) ( Ac-Ft) (Ft) ( Ac-Ft) ( Ac-Ft) Aug 26 Sep 26 WY Oct 26 Nov 26 Dec 26 Jan 27 Feb 27 Mar 27 Apr 27 May 27 Jun 27 Jul 27 Aug 27 Sep 27 WY Oct 27 Nov 27 Dec 27 Jan 28 Feb 28 Mar 28 Apr 28 May 28 Jun 28 Jul * Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 32 Processed On: 8/8/26 3:47:59PM

11 Date Unreg ( Ac-Ft) * Aug H Sep WY I Oct S Nov T Dec O Jan 26 3 R Feb I Mar C Apr A May L Jun * Jul Aug Sep WY Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep WY August Month Study Regulated ( Ac-Ft) Lake Powell Evap Losses Plant Bypass Bank EOM Lees Ferry Gage ( Ac-Ft) ( Ac-Ft) ( Ac-Ft) ( Ac-Ft) (Ft) ( Ac-Ft) ( Ac-Ft) ( Ac-Ft) Oct Nov Dec Jan Feb Mar Apr May Jun Jul * Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 32 Processed On: 8/8/26 3:47:59PM

12 August Month Study Hoover Dam - Lake Mead Glen Side Glen to Hoover Evap Losses SNWP Use Downstream Requirements Bank EOM Date ( Ac-Ft) ( Ac-Ft) ( Ac-Ft) ( Ac-Ft) ( CFS) ( Ac-Ft) ( Ac-Ft) ( Ac-Ft) (Ft) ( Ac-Ft) * Aug H Sep WY I Oct S Nov T Dec O Jan R Feb I Mar C Apr A May L Jun * Jul Aug Sep WY Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep WY Oct Nov Dec Jan Feb Mar Apr May Jun Jul * Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 32 Processed On: 8/8/26 3:47:59PM

13 August Month Study Davis Dam - Lake Mohave * H Date Aug 25 Sep 25 WY 25 Hoover ( Ac-Ft) Side ( Ac-Ft) Evap Losses ( Ac-Ft) ( Ac-Ft) Spill ( Ac-Ft) ( Ac-Ft) ( CFS) (Ft) EOM ( Ac-Ft) I S T O R I C A L * Oct 25 Nov 25 Dec 25 Jan 26 Feb 26 Mar 26 Apr 26 May 26 Jun 26 Jul Aug 26 Sep 26 WY Oct 26 Nov 26 Dec 26 Jan 27 Feb 27 Mar 27 Apr 27 May 27 Jun 27 Jul 27 Aug 27 Sep 27 WY Oct 27 Nov 27 Dec 27 Jan 28 Feb 28 Mar 28 Apr 28 May 28 Jun 28 Jul * Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 32 Processed On: 8/8/26 3:47:59PM

14 Date Davis ( Ac-Ft) * Aug H Sep WY I Oct S Nov T Dec O Jan R Feb I Mar C Apr A May L Jun * Jul Aug Sep WY Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep WY August Month Study Side Evap Losses ( Ac-Ft) ( Ac-Ft) ( Ac-Ft) Parker Dam - Lake Havasu ( CFS) MWD Diversion ( Ac-Ft) CAP Diversion ( Ac-Ft) (Ft) EOM ( Ac-Ft) Flow To Mexico ( Ac-Ft) Flow To Mexico ( CFS) Oct Nov Dec Jan Feb Mar Apr May Jun Jul * Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 32 Processed On: 8/8/26 3:47:59PM

15 August Month Study Hoover Dam - Lake Mead EOM Change In Hoover Static Head Hoover Gen Capacity Hoover Gross Energy Percent of Units Date ( Ac-Ft) ( CFS) (Ft) ( Ac-Ft) ( Ac-Ft) (Ft) MW MKWH Available KWH/AF * Aug H Sep WY I Oct S Nov T Dec O Jan R Feb I Mar C Apr A May L Jun * Jul Aug Sep WY Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep WY Oct Nov Dec Jan Feb Mar Apr May Jun Jul * Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 32 Processed On: 8/8/26 3:47:59PM

16 Date ( Ac-Ft) August Month Study ( CFS) EOM (Ft) ( Ac-Ft) Change In ( Ac-Ft) Davis Dam - Lake Mohave Davis Static Head (Ft) Davis Gen Capacity MW Davis Gross Energy MKWH Percent of Units Available KWH/AF * Aug H Sep WY I Oct S Nov T Dec O Jan R Feb I Mar C Apr A May L Jun * Jul Aug Sep WY Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep WY Oct Nov Dec Jan Feb Mar Apr May Jun Jul * Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 32 Processed On: 8/8/26 3:47:59PM

17 Date ( Ac-Ft) August Month Study ( CFS) EOM (Ft) ( Ac-Ft) Change In ( Ac-Ft) Parker Dam - Lake Havasu Parker Static Head (Ft) Parker Gen Capacity MW Parker Gross Energy MKWH Percent of Units Available * Aug H Sep WY I Oct S Nov T Dec O Jan R Feb I Mar C Apr A May L Jun * Jul Aug Sep WY Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep WY Oct Nov Dec Jan Feb Mar Apr May Jun Jul * Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 32 Processed On: 8/8/26 3:47:59PM KWH/AF

18 Glen Flaming Canyon Gorge Date MWHR MWHR * Aug 25 H Sep 25 Summer 25 August Month Study Blue Mesa MWHR Morrow Point MWHR Upper Basin Crystal Fontenelle Reservoir Reservoir MWHR MWHR I Oct S Nov T Dec O Jan R Feb I Mar Winter C Apr A May L Jun * Jul Aug Sep Summer Oct Nov Dec Jan Feb Mar Winter Apr May Jun Jul Aug Sep Summer Oct Nov Dec Jan Feb Mar Winter Apr May Jun Jul * Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 32 Processed On: 8/8/26 3:47:59PM

19 Date Aug 26 Sep 26 Oct 26 Nov 26 Dec 26 Jan 27 Jan 27 Feb 27 Mar 27 Apr 27 May 27 Jun 27 Jul 27 Aug 27 Sep 27 Oct 27 Nov 27 Dec 27 Jan 28 Jan 28 Feb 28 Mar 28 Apr 28 May 28 Jun 28 Jul 28 August Month Study Flood Control Criteria Beginning of Month Conditions Flaming Blue Lake Upper Basin Lake Flaming Blue Tot or Max Lake Lake BOM Space Mead Mead Sys Gorge Mesa Navajo Powell Mead Gorge Mesa Navajo Allow Powell Mead Required Sched Rel FC RelCont KAF KAF KAF KAF KAF KAF KAF KAF KAF KAF KAF KAF KAF KAF KAF KAF KAF 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 * * * * * * * * E F F E C T I V E S P A C E * * * * * * * * C R E D I T A B L E S P A C E * * * * * * * * E F F E C T I V E S P A C E * * * * * Based on the Colorado River Basin Forecast Center's Most Probable Water Supply Forecast Model Run ID: 32 Processed On: 8/8/26 3:47:59PM