Good afternoon,

 

Below are planned releases from HHWP facilities the week of June 26^th. Releases are being increased this week to manage a forecasted uptick in reservoir inflows due to the forecasted above normal temperatures this weekend.

 

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 snowmelt runoff progresses.

 

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

 

Hetch Hetchy Reservoir

• Total flows below O’Shaughnessy were increased to approximately 5,050 cfs late morning today, June 26^th
• Additional increases possible as the week progresses and forecast become more precise.

 

• Kirkwood Powerhouse
• Spill of approximately 400 cfs from 19:00-08:00
• Little to no spill expected 08:00-19:00

 

Cherry Reservoir

• Total flows below Cherry have been increased to approximately 600 cfs today, June 26^th
• Additional increases likely as the week progresses and forecast become more precise.

• Holm Powerhouse
• Approximately 100-200 cfs 08:00-17:00
• Significantly increased flows from 17:00-08:00
• Approximately 500-1000 cfs 17:00-08:00

 

Lake Eleanor

• Valve releases of 600+ cfs
• Current spill approximately 200-400cfs to increase to approximately 1000 cfs this late this weekend
• Current total flow below Eleanor approximately 800-1,000cfs to increase to ~1600 cfs by late this weekend

 

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Calculated real time flow station for Meral’s Pool:

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

• *NOTE:                 At current flow rates, USGS Tuolumne R below Early Intake stream gage is suspected to be overreporting by up to approx. 500-600 cfs

                                This gage is used in the virtual Meral’s Pool calculation

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