Good morning,

 

Below are planned releases from HHWP facilities through May 16.

 

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.

 

A warming trend this week will boost snowmelt and unregulated streamflow. Snowmelt and runoff will decrease again next week as cloud cover and cooler temperatures return.

 

Valve releases from Hetch Hetchy Reservoir will increase significantly this week, peaking on Saturday May 10, then incrementally decrease Sunday through next week as part of the Upper Tuolumne River Ecosystem Program.

 

Intraday powerhouse cycling is expected to continue. See details below.

 

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

 

Hetch Hetchy Reservoir

• Planned valve releases from Hetch Hetchy:
• Today, May 7: approximately 430 cfs, increasing to 750 cfs
• Thursday, May 8: 750 cfs increasing to 800 cfs
• Friday, May 9: 800 cfs increasing to 2,500 cfs
• Saturday, May 10: 2,500 cfs increasing to 5,000 cfs
• Sunday, May 11: 5,000 cfs decreasing to 3,000 cfs
• Monday, May 12: 3,000 cfs decreasing to 2,500 cfs
• Tuesday, May 13: 2,500 cfs decreasing to 1,700 cfs
• Kirkwood Powerhouse spill will be variable:

• Weekdays
• 00:00-11:00
• 300-650 cfs
• 11:00-16:00
• 0-50 cfs
• 16:00-24:00
• 300-650 cfs
• Weekends
• 00:00-10:00
• 300-650 cfs
• 10:00-17:00
• 0 cfs
• 17:00-24:00
• 300-650 cfs

 

Cherry Reservoir

• Planned valve releases from Cherry:
• Today, May 7 – Friday, May 9 : valve releases at 530 cfs
• Saturday, May 10 – Sunday, May 11: valve releases potentially increasing to 800 cfs
• Monday, May 12: valve releases at 530 cfs
• Tuesday, May 13 – Friday, May 16: valve releases incrementally decreasing to 10 cfs
• Holm Powerhouse flows will be variable:
• Weekdays
• 00:00-10:00
• 950 cfs
• 10:00-16:00
• 330 cfs
• 16:00-24:00
• 950 cfs
• Weekends
• 00:00-10:00
• 950 cfs
• 10:00-11:00
• 350 cfs
• 11:00-16:00
• 75 cfs
• 16:00-24:00
• 600-950 cfs

 

Lake Eleanor

• Valve releases below Eleanor are approximately 350-400 cfs
• Spill will vary in a range between 200-500 cfs
• 200-500 cfs spill expected through this weekend
• Spill will likely gradually decrease next week

 

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

• Thursday, May 8
• 3,000-4,000 cfs
• Friday, May 9
• 4,000-6,000 cfs
• Saturday, May 10
• 6,000-8,500 cfs
• Sunday, May 11
• 8,500-5,000 cfs
• Monday, May 12
• 6,500-4,500 cfs
• Tuesday, May 13
• 5,500-3,500 cfs
• Wednesday, May 14
• 4,500-2,500 cfs
• Thursday, May 15 – Friday, May 16
• 3,800-2,500 cfs

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