
The Bureau of Reclamation will reduce water releases from Nimbus Dam into the American River from 1,750 cubic feet per second (cfs) to 1,500 cfs today, September 6, much to the consternation of anglers and conservationists concerned about the low water conditions that fall-run Chinook salmon will face as they enter the river this autumn.
The reason? Storage conservation, claimed Randi Field, Reclamation spokesperson.
The ramping down in releases follows a previous reduction from Nimbus Dam, which was decreased from 3,250 cfs to 2,000 cfs by August 21 and then cut from 2,000 to 1,750 cfs on August 26.
Folsom Lake is currently holding 341,611 acre-feet of water, 35 percent of capacity and 57 percent of average.
The reduction in releases comes as Reclamation has dumped high releases of up to 5,000 cfs into the river for export by San Joaquin corporate agribusiness interests and Southern California water agencies.
Big water releases from Keswick and Oroville dams continue as the state and federal governments export massive quantities of water to agribusiness and Southern California water agencies.
Releases to the Sacramento River below Shasta Dam are now 9,500 cfs and releases to the Feather River below Oroville Dam are 6,100 cfs. The State Water Project's Harvey O. Banks Pumping Plant is exporting 7,029 cfs and the federal Tracy Pumping plant is exporting 4,220 cfs, amounting to total combined water exports of 11,249 cfs.
That has resulted in Delta outflows of only 5,165 cfs while Delta inflows are 18,970 cfs.
The American River fall Chinook run is a significant contributor to the ocean and river salmon fisheries. From 1996 to 2015, the American has provided 19 percent of the fall Chinook salmon returning to the Sacramento River system, the driver of West Coast salmon fisheries.
A total of 19,013 adult salmon and