Bighorn River - Battle of the Little Bighorn
Bighorn Canyon National Recreation Area. Photo: NPS

WYOMING – Wyoming Game and Fish plans to flush out the Bighorn River next week. Anglers and recreationists using the waterway should take note of the increased water flow.

Game and Fish has requested the flushing flow from the Bureau of Reclamation in order to clean fine sediments from fish spawning habitats and to increase production of invertebrates that fish depend on for food. River users will notice sizable increases in water flow and current on the Bighorn beginning March 24.

The Bureau of Reclamation will begin releasing additional water from Boysen Reservoir causing flows in the Bighorn River below Boysen Dam to fluctuate from 1,000 cubic feet per second (cfs) to 5000 cfs beginning Tuesday, March 24. At 2 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 a.m. for 10 hours before being reduced gradually back to 2,200 cfs at approximately midnight.

Game and Fish advises the public to be aware of the potential dangers related to flushing flows. Sportsmen wading or floating the river during this time should consider the fluctuating water levels. Areas that could be waded effectively prior to increases in flows may not be accessible at 5,000 cfs.

Flushing flows have been a regular occurrence on the river since 2005 and have dramatically improved wild rainbow trout recruitment in the Bighorn River.