22-039 Boise River flows increase June 9 to support salmon migration and with late snow, Lucky Peak will now fill in time for Father’s Day Weekend

Walla Walla District U.S. Army Corps of Engineers
Published June 7, 2022
Lucky Peak Dam

Lucky Peak Dam

Cool conditions, a slow melt of remaining snowpack, and several precipitation events have added significant water to the Boise River basin allowing Lucky Peak to begin filling to normal full pool (3,055 feet above mean sea level) and the Bureau of Reclamation and the U.S. Army Corps of Engineers will begin increasing flows downstream of Lucky Peak Dam to provide additional water for salmon migration in the lower Snake and Columbia rivers.

Currently, Boise River flows are approximately 500 cubic feet per second (cfs) at the Glenwood Bridge gauging station and will increase to approximately 1,800 cfs by Monday, June 13. Flows will increase approximately 500 cfs on Thursday, June 9, an additional 300 cfs on Friday, June 10, and another 500 cfs increase on Monday, June 13.  

The river will be running faster and higher than in recent weeks and water temperatures are still very cold. Please use caution when recreating near the river.

With Arrowrock nearing full and some snowpack remaining, conditions have also now been met that allow water management officials to fill Lucky Peak and hold it constant for an extended period. Arrowrock’s outflow has increased, and Lucky Peak will rise approximately two feet per day until filling near June 18th.  It is anticipated the lake will be kept within the top two feet through the end of July.

In coming weeks, the Corps, Idaho Department of Parks and Recreation and Ada County Parks and Waterways will be managing recreational facilities in response to rising lake levels, adjusting docks and removing temporary closures as launch ramps become safe to use once again.

For real-time Boise River flows at Reclamation facilities in the Pacific Northwest Region, visit https://www.usbr.gov/pn/hydromet/rtindex/boise.html.

Public Affairs Office

Release no. 22-039