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 950 cfs to 5000 cfs during the flushing flow. On March 27 at 2:00 a.m., the release of water from Boysen Dam will be increased to 2300 cfs and further increased to 5000 cfs at approximately 7:00 a.m. for 10 hours before being reduced gradually back to 950 cfs by approximately 4:00 a.m. on March 28, 2012.

The public is urged to use extreme caution during this period of rapid fluctuation of flows below Boysen Dam.