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USGS Water-Year Summary 2024
13340950 DWORSHAK RESERVOIR NEAR AHSAHKA, ID
LOCATION - Lat 46°30'55", long 116°17'46" referenced to North American Datum of 1983, in SW 1/4 SE 1/4 sec.26, T.37 N., R.1 E., Clearwater County, ID, Hydrologic Unit 17060308, Ahsahka quad., at Dam on North Fork Clearwater River, 1.5 mi northeast of Ahsahka, and at mile 2.0.
DRAINAGE AREA - 2,440 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1971 to current year.
GAGE - Water-stage recorder. Datum of gage is 1,603 ft above NGVD of 1929 (levels by U.S. Army Corps of Engineers).
REMARKS - Reservoir is formed by straight-axis concrete gravity dam. Total capacity is 3,469,000 acre-ft between elevations 970.0 ft, bottom of bypass valve, and 1,600.0 ft, normal full pool elevation. Inactive storage for minimum power head is 1,452,000 acre-ft, elevation, 1,445.0 ft. Storage began Sept. 27, 1971. Dworshak Dam is used to regulate annual floodwaters of the North Fork Clearwater River and for power generation.
EXTREMES FOR PERIOD OF RECORD - Maximum contents, 3,472,000 acre-ft, June 21, 22, 2020, June 27, 28, 2014, Aug. 16, 1978, and June 6, 1981; maximum elevation 1,600.21 ft Aug. 16, 1978, and June 6, 1981.
Minimum since full capacity was reached July 29, 1974, 1,455,000 acre-ft Mar. 29, 30, 1976, Apr. 10, 1999; minimum elevation observed, 1,445.31 ft, Apr. 10, 1999.
