Good morning,

 

Hetch Hetchy Water & Power has reduced all reservoir streamflow releases to minimum environmental required flows as of this week, with Holm Powerhouse continuing to make recreational releases during the 0700-1100 period each day through the Labor Day holiday. Flows on the Tuolumne will be reduced significantly beginning September 5^th.

 

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

 

Hetch Hetchy Reservoir

• Reservoir came off spill early this week, a new record for late-season spillway discharge
• Total stream releases are approx. 130 cfs
• Stream release will reduce to approx. 100 cfs on Friday, Sept 1^st
• Kirkwood Powerhouse
• Zero spill

Cherry Reservoir

• Valve releases below Cherry Reservoir are at approx. 17 cfs

• Holm Powerhouse
• Normal flows during rafting hours (0700-1100) will continue through Labor Day, with additional evening pulses to follow power demands
• Approx. 950 cfs from 7 AM - 11 AM
• 60 cfs from 11 AM - 4 PM
• Approx. 750 cfs from 4 PM - 9 PM
• 60 cfs 9 PM - 7 AM the following day
• NOTE: Monday, Sept 4^th will be the last day of recreational releases for the 2023 Water Year
• Flows will be significantly reduced during daytime hours beginning on Sept 5^th

 

Lake Eleanor

• Valve releases below Lake Eleanor remain at approx. 21 cfs

 

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Calculated real time flow station for Meral’s Pool:

https://cdec.water.ca.gov/jspplot/jspPlotServlet.jsp?sensor_no=37334&end=&geom=small&interval=2&cookies=cdec01

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