Hetch Hetchy Water and Power
Reservoir and Powerhouse Planned Releases
Reservoir Releases*
Reservoir | Elevation (ft) | Storage (TAF) | Planned Releases (cfs) | Special Conditions |
Hetch Hetchy | 3796.8 | 342.4 | 500-1000 | Hetchy Valve releases are at 650 cfs. Releases will range from 500 cfs to 1000 cfs until Hetchy storage reaches 360 TAF. After 360 TAF is reached, releases will follow inflows. |
Cherry | 4675.9 | 227.3 | 5 | None |
Eleanor | 4659.8 | 25.9 | 20-500 | Eleanor may fill and begin to spill depending on inflows. Spill may reach up to 500 cfs. |
Powerhouse Releases**
Powerhouse | Planned Tuolumne Releases (cfs) | Special Conditions |
Kirkwood | 500 | Spill at KPH. Maintenance on 5/30 will reduce spill at KPH to 0 cfs from 7AM to 3PM |
Holm | 250 |
|
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.