Good afternoon,

Below are planned releases from HHWP facilities through May 16. Updates to be provided as needed.

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. Flows will continue to vary significantly over the coming weeks as weather changes and spring runoff season progresses.

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

Hetch Hetchy Reservoir

Total flows immediately below Hetch Hetchy are currently 1,630 cfs.

Flow increases are scheduled to begin next week. Tentative schedule below (subject to change):

May 13: 2,500 cfs
May 14: 3,500 cfs
May 15: 5,000 cfs
May 16: 4,100 cfs

HHWP will provide notice early next week if changes are expected

Kirkwood Powerhouse

Spill of approximately 700 cfs around the clock Monday-Friday
WEEKENDS: spill will reduce to 0 cfs from 07:00-19:00, 700 cfs otherwise

Cherry Reservoir

Total flows immediately below Cherry are approximately 330 cfs

Flow increases may be required to manage reservoir storage
Notices to be provided as needed

Holm Powerhouse

Spill of approximately 1,000 cfs around the clock Monday-Friday
WEEKENDS: spill will reduce to 0 cfs from 09:00-17:00, 1,000 cfs otherwise

Lake Eleanor

Run-of-river operation with full storage
Valve releases of approximately 630 cfs
Spill is expected to range from 0 to 800 cfs

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Meral’s Pool

Flows are currently approximately 5,000 cfs
Flows will be in an estimated range between 4,000-6,000 cfs this weekend
Flows are tentatively estimated to increase to a range between 7,000-9,500+ cfs toward the middle of next week

Calculated real time flow station for Meral’s Pool:

https://cdec.water.ca.gov/dynamicapp/QueryF?s=TMP

https://cdec.water.ca.gov/webgis/?appid=cdecstation&sta=TMP

Any significant changes to the schedule will be posted on the bulletin board.