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USGS Water-Year Summary 2024
13172500 SNAKE RIVER NEAR MURPHY, ID
LOCATION - Lat 43°15'17.33", long 116°23'26.30" referenced to North American Datum of 1983, Ada County, ID, Hydrologic Unit 17050103, on right bank, 0.9 mi downstream from Swan Falls power plant, at river mi 456.3.
DRAINAGE AREA - 41,900 mi².
REVISIONS HISTORY - WSP 1737: 1933(M).
SURFACE-WATER RECORDS
PERIOD OF RECORD - August to October 1912, August 1913 to current year. On February 1, 2017 the gage was "relocated" from the former Snake river near Murphy location (13172500) to the current location 3.5 miles upstream formerly known as 13172455 Snake River below bypass nr Murphy that was established April 2, 2015 by USGS personnel. Approximate river mile 456.7.
GAGE - Water stage recorder and crest-stage gage. Elevation of gage datum is arbitrary.
REMARKS - Major regulation by American Falls Reservoir, 260.5 mi upstream. Diurnal fluctuation caused by hydroelectric plants upstream. Diversions above station for irrigation of about 2,590,000 acres, of which about 701,000 acres are irrigated by withdrawals from ground water (1966 determination).
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 47,300 ft³/s June 22, 1918, gage height, 13.95 ft, site and datum then in use; minimum discharge, 3,650 ft³/s July 7, 1981, gage height, 2.22 ft, site and datum then in use.
