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Water-Year Summary for Site 13135000

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Available Parameters
00060 Discharge(Mean)  

Water year 2023: 2022-10-01 to 2023-09-30
 
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USGS Water-Year Summary 2023
13135000 SNAKE RIVER BELOW LOWER SALMON FALLS, NEAR HAGERMAN, ID
LOCATION - Lat 42°50'55", long 114°54'02" referenced to North American Datum of 1927, in NW 1/4 sec.02, T.7 S., R.13 E., Gooding County, ID, Hydrologic Unit 17040212, Hagerman quad., on right bank, 0.5 mi downstream from Lower Salmon Falls powerplant, 1 mi upstream from Malad River, 2.2 mi north of Hagerman, and at mile 572.5.
DRAINAGE AREA - 26,070 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1937 to current year. Monthly discharge only for October 1937, published in WSP 1317.
GAGE - Water-stage recorder. Datum of gage is 2,727.7 ft above NGVD of 1929 (stadia levels). Prior to Jan. 3, 1950, at site 340 ft upstream.
COOPERATION - Discharge records furnished by Idaho Power and reviewed by U.S. Geological Survey beginning April 2001.
REMARKS - Flow regulated by American Falls Reservoir, 141.6 mi upstream. Diurnal fluctuation caused by hydroelectric plants upstream. At times, practically entire flow is diverted at Milner during the irrigation season; only minor diversions below Milner. Most of the percolation upstream into the Snake River Plain aquifer returns above station, including some water diverted from the Malad River. Diversions above station for irrigation of about 2,330,000 acres, of which about 665,000 acres are irrigated by withdrawals from ground water. There are about 83,000 acres irrigated below station.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 38,500 ft³/s June 21, 1997, gage height, 18.81 ft; minimum, probably less than 100 ft³/s Jan. 10, 11, 1950, when river was below intake pipes; minimum daily, 3,500 ft³/s Nov. 2, 2005; minimum observed, 500 ft³/s Nov. 2, 2005, result of discharge measurement by Idaho Power Company.