Good morning and Happy Memorial Day,

 

Below are UPDATED planned releases from HHWP facilities through May 30.

 

For permitting and access information, contact the Groveland Ranger District.

 

We strive to keep the user community updated on projected flows on the Tuolumne River.

 

Flows below Hetch Hetchy Reservoir have been increased modestly and will continue to increase over the coming week. No changes to powerhouse schedules. Note that forecasts and releases in the near-term remain relatively uncertain. If significant changes arise, this message will be updated prior to the end of the stated time window.

 

Intraday powerhouse cycling is expected to continue. See details below.

 

Stated flow rates are best estimates and are subject to change as conditions and operational constraints evolve.

 

Hetch Hetchy Reservoir

• Planned valve releases from Hetch Hetchy:
• Increasing to approx. 2,100 cfs 05/26
• Valve releases will be variable between 2,000-3,000+ cfs on 05/27 for regular maintenance activities
• Valves will potentially be increased toward 2,500-2,700 cfs 05/28-05/30
• Reservoir is expected to fill and spill toward the end of May into early June during which time releases will vary dramatically
• Kirkwood Powerhouse spill will be variable:

• Weekdays
• 00:00-11:00
• 300-650 cfs
• 11:00-16:00
• 0-50 cfs
• 16:00-24:00
• 300-650 cfs
• Weekends
• 00:00-10:00
• 300-650 cfs
• 10:00-17:00
• 0 cfs
• 17:00-24:00
• 300-650 cfs

 

Cherry Reservoir

• Valve releases are at approx. 10 cfs
• Valve increases to a 150-500 cfs range expected this week 05/27-05/30
• Holm Powerhouse flows will be variable:
• Weekdays
• 00:00-10:00
• 950 cfs
• 10:00-16:00
• 330 cfs
• 16:00-24:00
• 950 cfs
• Weekends
• 00:00-10:00
• 950 cfs
• 10:00-11:00
• 350 cfs
• 11:00-16:00
• 75 cfs
• 16:00-24:00
• 600-950 cfs

 

Lake Eleanor

• Valve releases below Eleanor are approximately 350 cfs
• Eleanor total release is expected to remain in a range between 400-500 cfs for the next week

 

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Meral’s Pool (best estimates, actual timing and flows may differ)

• Monday May 25-26
• 4,300-3,500 cfs
• Tuesday, May 27
• 4,600-3,500 cfs
• Valve releases below Hetch Hetchy will be variable due to valve cycling maintenance
• Wednesday-Friday May 28-30
• Flows increasing into a range of approx. 4,400-5,400 cfs

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Any significant changes to the schedule will be posted on the bulletin board.