Good afternoon,

 

Below is an updated release projection from HHWP facilities through June 26. An additional update will be provided next week. Next Wednesday, June 24 will be a No Water Wednesday. No recreational releases from Holm Powerhouse will occur.

 

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.

Powerhouse generation has been reduced in response to receding reservoir inflows. Intraday powerhouse cycling will continue this week, with pulses occurring between 07:00-11:00 at Holm Powerhouse to sustain recreational flows on the Tuolumne. Spill from Hetch Hetchy Reservoir will continue to recede with natural inflows.

 

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 230 cfs
• Spillway flow fluctuating, 50 – 250 cfs

 

• Kirkwood Powerhouse
• Wednesday June 17

• spill 200 cfs

 

• Thursday June 18 – Friday June 26

• spill 0 cfs

 

Cherry Reservoir

• Flows immediately below Cherry are approximately 6 cfs

• Holm Powerhouse

 

• Wednesday June 17
• 00:00 – 07:00: 60 cfs
• 07:00 – 11:00: 720 cfs
• 11:00 – 16:00: 60 cfs
• 16:00-24:00: 200 cfs

 

• Thursday June 18 – Tuesday June 23
• 00:00 – 07:00: 40 cfs
• 07:00 – 11:00: 950 cfs
• 11:00 – 24:00: 40 cfs

 

• Wednesday June 24 : No Water Wednesday
• 00:00 – 24:00: 40 cfs

 

• Thursday June 25 – Friday June 26
• 00:00 – 07:00: 40 cfs
• 07:00 – 11:00: 950 cfs
• 11:00 – 24:00: 40 cfs

 

Lake Eleanor

• Flows immediately below Eleanor are approximately 21 cfs

 

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Meral’s Pool (best estimates, actual flows may differ)

 

• Wednesday June 17

o   500 – 1,300 cfs

§  00:00 – 09:00: 500-900 cfs* dependent on spill from Hetch Hetchy

§  09:00 – 13:00: 1,100-1,300 cfs *

§  13:00 – 18:00: 500-600 cfs *

§  18:00-24:00: 600-700 cfs*

 

• Thursday June 18 – Tuesday June 23

o   300 – 1,300 cfs

§  00:00 – 09:00: 300-400 cfs* dependent on spill from Hetch Hetchy

§  09:00 – 13:00: 1,100-1,300 cfs *

§  13:00 – 24:00: 300-400 cfs *

 

• Wednesday June 24
• No Water Wednesday
• 00:00 - 24:00: 200-400 cfs* dependent on spill from Hetch Hetchy

 

• Thursday June 25 – Friday June 26

o   300 – 1,300 cfs

§  00:00 – 09:00: 300-400 cfs* dependent on spill from Hetch Hetchy

§  09:00 – 13:00: 1,100-1,300 cfs *

§  13:00 – 24:00: 300-400 cfs *

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