Good afternoon,

 

Below are planned releases from HHWP facilities the week of June 20^th. Releases are being reduced this week to promote storage increases amidst a pronounced cooldown in air temperatures and subsequent drops in snowmelt runoff.

 

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 reduced to approximately 5,500 cfs this afternoon, June 13^th
• Additional reductions to approx. 4,500-4,800 cfs tomorrow, June 21

 

• 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 reduced to approximately 320 cfs

• Holm Powerhouse
• Approximately 100-200 cfs 08:00-17:00
• Significantly increased flows from 17:00-08:00
• Approximately 500-900 cfs 17:00-08:00

 

Lake Eleanor

• Valve releases of 600+ cfs
• Spill approximately 400-600 cfs
• Total flow below Eleanor approximately 1,000-1,300 cfs

 

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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.