Hetch Hetchy Water and Power reported on May 15 as follows:

Good afternoon,

Below are planned releases from HHWP facilities through May 22.

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 remain elevated and may 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

• Flows immediately below Hetch Hetchy are approximately 5,000 cfs
• Releases for the next week will target the following schedule
• May 16: 5,000 cfs, reducing to 4,100 cfs in the afternoon
• May 17-22: 4,100 cfs
• HHWP will provide notice if changes to this schedule arise
• Kirkwood Powerhouse

• Spill of approximately 700 cfs around the clock Monday-Saturday
• Sunday: spill will reduce to 0 cfs from 08:00-16:00, 700 cfs otherwise

Cherry Reservoir

• Total flows immediately below Cherry are approximately 690 cfs
• Flow changes 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-Saturday
• Sunday: spill will reduce to approximately 50 cfs 09:00-14:00, 350 cfs 14:00-16:00, 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 (best estimates, actual flows may differ)

• Flows are currently approximately 9,500 cfs
• 9,500-10,000 cfs likely on Thursday
• 8,000-8,500 cfs likely Friday-Saturday
• 8,500 decreasing toward 6,500-7,000 Sunday late morning
• 7,500-8,000 cfs Monday-Wednesday

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.