Good afternoon,

 

Below are planned releases from HHWP facilities through April 29. An additional update will be provided next week.

 

Above-normal precipitation in April has resulted in additional planned UTREP releases. These releases will likely occur during the first half of May. Details on the next UTREP release will be communicated in a future update.

 

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.

Intraday powerhouse cycling is expected to continue, following similar patterns. Continued unsettled weather will result in fluctuating natural runoff over the next 7 days. Spill from Lake Eleanor and inflows below HHWP reservoirs are expected to increase over the weekend. Continued elevated valve releases from Cherry Lake and Hetch Hetchy Reservoir are expected during this period.

 

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

 

Hetch Hetchy Reservoir

• Flows immediately below Hetch Hetchy are approximately 450 cfs
• Valve releases may be reduced to 200 cfs
• Kirkwood Powerhouse

• 00:00 – 09:00: spill 600 cfs
• 09:00 – 17:00: spill 0 cfs
• 17:00 – 00:00: spill 600 cfs

 

Cherry Reservoir

• Total flows immediately below Cherry are approximately 540 cfs
• Valve releases will decrease to 100 cfs or lower tomorrow

• Holm Powerhouse
• 45 – 900+ cfs

 

Lake Eleanor

• Valve releases below Eleanor are at approximately 300 cfs
• Spill is approximately 200 cfs
• Spill will fluctuate with natural inflows

 

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

 

Wednesday April 22

• 2,000 – 4,000 cfs
• 00:00 – 11:00: 4,000 cfs
• 11:00 – 19:00: 2,000 cfs
• 19:00 – 00:00: 4,000 cfs

 

Thursday April 23 – Wednesday April 29

• 1,500 – 3,500 cfs
• 00:00 – 11:00: 3,500 cfs
• 11:00 – 19:00: 1,500 cfs
• 19:00 – 00:00: 3,500 cfs