Good morning,

 

Below are planned releases from HHWP facilities through April 22. Increased valve releases from Cherry Lake and Hetch Hetchy Reservoir are possible, details on timing remain uncertain. An additional update will be provided next week.

 

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. Widespread precipitation and accumulating snow above 6,000 feet are expected next Monday through Wednesday. Spill from Lake Eleanor and inflows below HHWP reservoirs are expected to increase. Increased valve releases from Cherry Lake and Hetch Hetchy Reservoir are possible 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 200 cfs
• Valve releases may increase in response to natural inflows
• 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 6 cfs
• Valve releases may increase in response to natural inflows

• Holm Powerhouse
• 45 – 900+ cfs

 

Lake Eleanor

• Valve releases below Eleanor are at approximately 100 cfs
• Spill is approximately 350 cfs
• Spill will fluctuate with natural inflows

 

 

___________________________                                                      _

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

 

Friday April 17 – Wednesday April 22

• 1,000 – 2,500 cfs
• 00:00 – 11:00: 3,000 cfs
• 11:00 – 19:00: 1,500 cfs
• 19:00 – 00:00: 3,000 cfs