Hetch Hetchy Water and Power

Reservoir and Powerhouse Planned Releases

Period of April 30 – May 11

 

Reservoir Releases*

Reservoir

Elevation (ft)

Storage (TAF)

Planned Releases (cfs)

Special Conditions

Hetch Hetchy

3787.6

324.8

1000-3200

Increased valve releases at Hetchy due to increased inflows. Plan is to maintain 3200 cfs through May 7, then drop to ~1000 cfs. Releases may change as inflows change.

Cherry

4656.3

204.9

5 - 2500

Valve commissioning will require full exercise of the valves. Flows will increase to 2500 cfs for short periods. Date to be determined – we will send out a notice.

Eleanor

4656.3

22.6

100 – 300

Valve releases 100-300 cfs expected to continue while inflows are high.

 

Powerhouse Releases**

Powerhouse

Planned Tuolumne Releases (cfs)

Special Conditions

Kirkwood

500

Spill at KPH

Holm

950

 

Moccasin***

100-300

Spill at Moccasin Reservoir

 

 

* Reservoir releases are dependent on storage and weather conditions, and can be changed at any time.

** Powerhouse releases can vary significantly dependent on power load and operational constraints. Planned releases are estimates.

*** Moccasin releases seen at Moccasin Creek between town of Moccasin and Don Pedro Reservoir. These releases do not affect Tuolumne River conditions, but do impact recreation in Moccasin Creek.