Good afternoon,

 

Below are planned releases from HHWP facilities through June 6.

 

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 decreased modestly and will vary with the onset of spill during the coming week. Releases below powerhouses will be slightly higher this weekend. 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 on weekdays 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 and spill releases from Hetch Hetchy:
• Currently approx. 2,200 cfs
• Reservoir is expected to fill and spill in early June during which time releases will increase by 500 – 1,000 cfs
• Valve plus spill releases will be variable between 2,000-3,000+ cfs from around June 1 through June 4
• Kirkwood Powerhouse spill will be variable:

• Weekdays
• 00:00-11:00
• 400-650 cfs
• 11:00-16:00
• 400 cfs
• 16:00-24:00
• 400-650 cfs
• Weekends
• 00:00-24:00
• 650 cfs

 

Cherry Reservoir

• Valve releases are at approx. 130 cfs
• Valve increases within the 350-500 cfs range possible this weekend
• Holm Powerhouse flows will be variable:
• Weekdays
• 00:00-10:00
• 950 cfs
• 10:00-16:00
• 800 cfs
• 16:00-24:00
• 950 cfs
• Weekends
• 00:00-24:00
• 950 cfs

 

Lake Eleanor

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

 

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

• Thursday May 29
• 6,000-4,500 cfs
• Friday, May 30 – Saturday, May 31
• 4,700-4,000 cfs
• Sunday, June 1 – Tuesday June 3
• Flows increasing into a range of approx. 6,000-5,000 cfs
• Wednesday, June 4 – Friday, June 6
• Flows gradually decreasing to into a range of approx. 4,000 – 3,000 cfs

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