16-014 Dworshak increases flow discharge in anticipation of additional inflows

Published March 31, 2016

AHSAHKA, Idaho –Discharge flows from Dworshak Dam and Reservoir are being increased today, March 31, 2016, from approximately 2,200 c.f.s. (cubic feet per second) to about 14,000 c.f.s. to make room for anticipated inflows resulting from additional rainfall and snowmelt in the Clearwater sub-basin, according to U.S. Army Corps of Engineers water-management officials.

Flows will increase gradually starting at noon, causing water elevation in the Clearwater River to rise about one-half-foot per hour until approximately 5 p.m., when flows reach their target output. To manage reservoir space and reduce flood risk, water managers will maintain the discharge rate until inflows subside.

Corps officials advise boaters, anglers and other people using waterways both in Dworshak Reservoir and below the dam on the Clearwater River to be alert to changes in water elevation and volume of flow. Water-management changes can be pretty dynamic this time of year as weather systems come through the region and temperatures begin to rise. Current water-management conditions can be viewed on the District website at http://www.nww.usace.army.mil/Missions/WaterManagement.aspx.

Managing water levels to reduce flood risk throughout the reservoir system requires constant weather and snow-pack monitoring and making appropriate adjustments to ensure enough storage space is available for rainfall and snowmelt that occurs each spring.

Dworshak’s powerhouse has two 90,000-kilowatt and one 220,000-kilowatt generating units in operation, for a total capacity of 400,000 kilowatts. Dworshak Reservoir has a gross storage capacity of 3,468,000 acre-feet, of which about 2 million acre-feet is used for local and regional flood risk management; and for at-site and downstream power generation. At full-pool elevation of 1,600 mean sea level, the reservoir is about 54 miles long, has a surface area of about 20,000 acres and extends into the Bitterroot Mountains. The reservoir provides substantial recreational and wildlife benefits.


Public Affairs Office

Release no. 16-014