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- Fluctuation of Bighorn River Flow Downstream of Boysen Dam
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Fluctuation of Bighorn River Flow Downstream of Boysen Dam
Media Contact:
John H. Lawson, (307) 261-5671, jlawson@usbr.gov
Michael R. Odle, modle@usbr.gov
For Release: March 24, 2009
The Bureau of Reclamation has evaluated a request from the Wyoming Game and Fish Department to provide a flushing flow in the Big Horn River downstream of Boysen Dam. Based on reservoir conditions and anticipated inflows to Boysen Reservoir, Reclamation has determined that a flushing flow can be provided in March according to Wyoming Area Manager, John H. Lawson.
The purpose of the flushing flow is to improve trout reproduction by flushing fine sediments from spawning gravels in the river. The flushing flow also improves insect production in the stream by opening up interstitial spaces between gravels and cobbles. The flushing flow is generally welcomed by anglers, because it provides easier wading conditions. Following the flushing flow, there is a reduction in floating algae.
Flows in the river below Boysen Dam will fluctuate from 700 cubic feet per second (cfs) to 5,000 cfs during the flushing flow. On March 31 at 2:00 a.m., the release of water from Boysen Dam will be increased to 3,000 cfs and further increased to 5,000 cfs at approximately 7:15 a.m. for 10 hours before being reduced gradually back to 700 cfs by approximately noon on April 1, 2009.
The public is urged to use extreme caution during this period of rapid fluctuation of flows below Boysen Dam.
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