Joint Agency Release - Lucky Peak Reservoir pool to begin lowering on August 18th

Published Aug. 9, 2019
Water levels for Lucky Peak Lake Near Boise, Idaho

Water levels for Lucky Peak Lake Near Boise, Idaho

The U.S. Army Corps of Engineers and the Bureau of Reclamation will begin lowering the pool elevation of Lucky Peak Reservoir on August 18th, 2019. The lowering of Lucky Peak Reservoir facilitates required maintenance of the clamshell outlet gates at Arrowrock Dam and follows a typical end of season reservoir drawdown for irrigation as experienced in prior years. For instance, Lucky Peak Reservoir pool began lowering last year on August 14, 2018. This is considered minor maintenance and does not present a risk to the public but is necessary for operations at Arrowrock reservoir.

Lucky Peak Reservoir will target a pool elevation of 3012 feet by approximately September 10th, 2019 to allow for the maintenance work at Arrowrock Dam to begin and will then continue lowering at a normal rate as prior years.

Currently, the Boise River System reservoirs are at 77% of capacity. Above average carryover is projected in the Boise River System reservoirs at the end of the irrigation season which will help water supply should next season be a dry year.  

For real-time Boise River flows at Reclamation facilities in the Pacific Northwest Region, visit

# # #


Reclamation is the largest wholesale water supplier in the United States, and the nation’s second largest producer of hydroelectric power. Its facilities also provide substantial flood control, recreation, and fish and wildlife benefits. Visit our website at and follow us on Twitter @USBR.

The Corps of Engineers and the Bureau of Reclamation operate three dams on the Boise River as a system to manage flood control and irrigation storage needs — Lucky Peak Dam, Arrowrock Dam and Anderson Ranch Dam. Storage capacity provided by Reclamation’s Arrowrock and Anderson Ranch dams, and the Corps’ Lucky Peak Dam, combined with well-planned water releases, help manage Boise River flows through the City of Boise.


Edna Vizgirdas

Release no. 19-090