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USGS Water-Year Summary 2024
13290450 SNAKE RIVER AT HELLS CANYON DAM, IDAHO-OREGON STATE LINE
LOCATION - Lat 45°15'16", long 116°41'49" referenced to North American Datum of 1983, Wallowa County, OR, Hydrologic Unit 17060101, Oregon, Wallowa-Whitman National Forest, Squirrel Prairie quad., on left bank 0.05 mi downstream from Hells Canyon Creek, 0.7 mi downstream from Deep Creek, 0.9 mi downstream from Hells Canyon Dam, 15.5 mi northeast of Homestead, Oregon, and at mile 246.8.
DRAINAGE AREA - 73,300 mi².
REVISIONS HISTORY - WDR ID-78-2: 1969-70, 1972-76, WDR ID-79-2: 1972-73(m).
SURFACE-WATER RECORDS
PERIOD OF RECORD - July 1965 to current year.
GAGE - Water-stage recorder. Datum of gage is 1,400.00 ft above NGVD of 1929 (levels by Idaho Power Company). Prior to Oct. 16, 2019 at site 900 ft upstream at the same datum.
COOPERATION - Discharge records furnished by Idaho Power and reviewed by U.S. Geological Survey beginning October 2001.
REMARKS - Flow regulated by many reservoirs above station, with a total usable capacity of more than 10,000,000 acre-feet, the most effective of which is Brownlee Reservoir 38 mi upstream (see sta 13289700). Diurnal fluctuations caused by Hells Canyon powerplant. Diversions above station for irrigation of about 3,820,000 acres, of which 742,000 acres are irrigated by withdrawals from ground water (1966 determination).
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 103,000 ft³/s Jan. 2, 1997, gage height, 86.17 ft, site then in use; minimum, 1,580 ft³/s Mar. 19, 1967, gage height, 59.9 ft, site then in use; minimum daily, 4,360 ft³/s May 8, 1977.
