Reclamation Acts to Address Temperature

Posted on Sunday, March 29th, 2015

Reclamation operators solicited opinions from State and Federal biologists and Water Forum stakeholders during a special session of the American River Group (ARG) on Friday March 27.  Meeting participants advocated for a range of possible actions: from keeping flows at 500 cfs to increasing flows to 800 cfs for a number of days.

One of the key items of discussion was the observed river temperatures at Rossmoor Bar and foretasted warm days over the weekend.  This graphic (complements of the Water Forum) was presented to illustrate the relatively high river temperatures and the warm weather forecast:

DRAFT_WF_Temperature traces_v3_short3

After discussion and data sharing, Reclamation chose to initiate a power bypass (lower river outlets) to send colder water downstream AND send an 800 cfs pulse of of water for 24 hours.  NMFS staff concurred with the plan.  The intent of the pulse is to reduce the travel time through Lake Natoma and get the colder water down to the gravel as quickly as possible.  This is especially important given the predicted warm weather over the weekend.

The Sac Bee had an article about the issue today [Click Here].

You can see the lower release temperatures in this graph:Shutter Pull and Power Bypass 3-29-15

This graph shows the start of the pulse flow:Start of Pulse Flow 3-29-15


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PostedSunday, March 29th, 2015