Good evening,

 

Below is an updated release projection from HHWP facilities through June 10. An additional update will be provided next week.

 

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 vary with natural inflows throughout the week.

 

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 730 cfs
• Spillway flow fluctuating, 500 – 900 cfs

 

• Kirkwood Powerhouse
• Thursday June 4 – Friday June 5

• spill 250 cfs

 

• Saturday June 6 – Wednesday June 10

• 00:00 – 10:00: spill 250 cfs
• 10:00 – 15:00: spill 0 cfs
• 15:00 – 00:00: spill 250 cfs

 

 

Cherry Reservoir

• Flows immediately below Cherry are approximately 6 cfs

• Holm Powerhouse
• Thursday June 4 – Friday June 5
• 00:00 – 07:00: 250
• 07:00 – 11:00: 750 cfs
• 11:00 – 16:00: 200 cfs
• 16:00-21:00: 600 cfs
• 21:00-24:00: 270 cfs

 

• Saturday June 6 – Wednesday June 10
• 00:00 – 07:00: 200
• 07:00 – 11:00: 600 cfs
• 11:00 – 16:00: 60 cfs
• 16:00-21:00: 600 cfs
• 21:00-24:00: 200 cfs

 

 

Lake Eleanor

• Flows immediately below Eleanor are approximately 25 cfs

 

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

 

• Thursday June 4 – Friday June 5

o   1,100 – 2,000 cfs

§  00:00 – 09:00: 1,100-1,200 cfs* dependent on spill from Hetch Hetchy

§  09:00 – 13:00: 1,700-2,000 cfs *

§  13:00 – 18:00: 1,200-1,300 cfs *

§  18:00-24:00: 1,700-1,800 cfs *

 

• Saturday June 6 – Wednesday June 10

o   1,100 – 2,200 cfs

§  00:00 – 09:00: 1,500-1,600 cfs* dependent on spill from Hetch Hetchy

§  09:00 – 13:00: 1,900-2,100 cfs *

§  13:00 – 18:00: 1,200-1,300 cfs *

§  18:00-24:00: 1,900-2,100 cfs*

 

 

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