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USGS Water-Year Summary 2024
13081500 SNAKE RIVER NEAR MINIDOKA, ID
LOCATION - Lat 42°40'22", long 113°30'01" referenced to North American Datum of 1983, in sec.02, T.9 S., R.25 E., Minidoka County, ID, Hydrologic Unit 17040209, Lake Walcott West quad., on right bank 1 mi downstream from Minidoka Dam, 6 mi south of Minidoka, and at mile 673.5.
DRAINAGE AREA - 15,700 mi². excluding indeterminate nontributary area on Snake River Plain.
SURFACE-WATER RECORDS
PERIOD OF RECORD - April 21, 1910 to current year. Monthly discharge only for some periods, published in WSP 1317. Published as "below Minidoka Dam, at Howell's Ferry", 1911. Records for August 1895 to Apr. 20, 1910, at site 6 mi downstream "at Montgomery Ferry near Minidoka" are not equivalent.
GAGE - Water-stage recorder. Datum of gage is 4,134.65 feet above NAVD 1988 (USGS). Prior to Apr. 21, 1910, non-recording gage at site 6 mi downstream at different datum. Apr. 21, 1910 to Aug. 28, 1911, non-recording gage at present site and datum.
REMARKS - Flow regulated by Lake Walcott (1906), American Falls Reservoir (1927), and other reservoirs, having a combined usable capacity of about 4,700,000 acre-ft. Diversions above station for irrigation of about 128,000 acres below and about 1,200,000 acres above station, of which about 304,000 acres are irrigated by withdrawals from groundwater (1966 determination). Considerable water leaks into the Snake River Plain aquifer above station.
EXTREMES OUTSIDE PERIOD OF RECORD - Maximum discharge of 47,500 ft³/s May 29, 30, 1897, at site 6 mi downstream at Montgomery Ferry near Minidoka, gage height, 12.6 ft (datum at that site).
EXTREMES FOR PERIOD OF RECORD - UNREGULATED PERIOD (1910-26): Maximum discharge prior to regulation by American Falls Dam, 45,900 ft³/s June 21, 1918, gage height, 16.02 ft; minimum daily, 1,700 ft³/s Aug. 2, 1919.
REGULATED PERIOD (1927 to current year): Maximum discharge since regulation began in 1927, 42,900 ft³/s June 21, 1997, gage height, 15.49 ft; minimum, 37 ft³/s Jan. 28, 1962.
