Hetch Hetchy Water and Power

Reservoir and Powerhouse Planned Releases

Period of May 14-25

 

Reservoir Releases*

Reservoir

Elevation (ft)

Storage (TAF)

Planned Releases (cfs)

Special Conditions

Hetch Hetchy

3777.9

306.6

2,400 – 1,000

Hetchy Valve releases are currently being lowered from 2400 cfs to ~1000 cfs. ~1000 cfs will be maintained until Hetchy storage reaches 360 TAF. After 360 TAF is reached, releases will follow inflows.

Cherry

4664.6

208.6

5

None

Eleanor

4659.2

25.3

20 – 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.