Good morning,

 

Hetch Hetchy Reservoir spill remains elevated, expected to recede gradually over the weekend into next week.

 

Flows at the Cherry-Tuolumne confluence are expected to be in the 1,500-1,800 cfs range during the 07:00-11:00 period. Holm Powerhouse generation will vary dramatically outside these hours.

 

Hetch Hetchy Reservoir

• Total flows below O’Shaughnessy are approximately 750-800 cfs as of this morning
• Releases are expected to gradually recede by late in the weekend (600-700 cfs anticipated by Sunday)
• Flows likely to decrease further next week as remaining high-elevation snowpack disappears after the passing heat wave
• Kirkwood Powerhouse
• Spill of approximately 100 cfs from 19:00-07:00
• Little to no spill expected 07:00-19:00

 

Cherry Reservoir

• Holm Powerhouse
• Approximately 950 cfs 07:00-11:00
• Significantly reduced flows from 11:00-17:00
• Approximately 200 cfs 11:00-17:00 (Saturday/Sunday)
• Lower flows (~50 cfs) 11:00-17:00 beginning next Monday
• High flows (~550-950 cfs) expected to occur during evening hours (17:00-23:00)
• Reminder: next Wednesday June 15 is a No Water Wednesday
  (no 07:00-11:00 pulse flow guaranteed)

Lake Eleanor

• Valve releases of 20-25 cfs

 

As always, stated flow rates are best estimates and are subject to change as conditions and operational constraints evolve.