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USGS Water-Year Summary 2024
13068500 BLACKFOOT RIVER NEAR BLACKFOOT, ID
LOCATION - Lat 43°07'50", long 112°28'36" referenced to North American Datum of 1983, in sec.28, T.3 S., R.34 E., Bingham County, ID, Hydrologic Unit 17040207, Fort Hall Indian Reservation on the left bank 57 ft upstream from the highway bridge, 8 miles southwest of Blackfoot and at mile 3.4.
DRAINAGE AREA - 1,295 mi². including that of Sand Creek, the flow of which is diverted to Blackfoot River through the Idaho Canal.
SURFACE-WATER RECORDS
PERIOD OF RECORD - July 1913 to current year (prior to October 1931, summer months only). Monthly discharge only for some periods, published in WSP 1317.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 4,418.80 feet above NAVD 1988 (USGS). Prior to May 8, 1926, non recording gage, and May 8, 1926 to June 25, 1937, water-stage recorder at site 0.5 mi upstream at different datum. June 26, 1937 to Aug. 16, 1963, water-stage recorder at site 175 ft downstream at same datum.
REMARKS - Flow regulated by Blackfoot Reservoir. Diversions above station for irrigation of about 28,000 acres below and about 32,000 acres above station, of which about 900 acres are irrigated by withdrawals from groundwater (1966 determination). Part of flow is supplied by waste water from Snake River canals. Diversions to the bypass channel (station 13068495) 5.5 mi upstream from station began in April 1964. For records and statistics of combined discharges, see station 13068501.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge prior to Blackfoot River Bypass channel diversion, 1,710 ft³/s Feb. 11, 1962, gage height, 7.68 ft.
Since 1964, river only: maximum discharge, 740 ft³/s June 12, 1984, gage height, 5.53 ft; maximum gage height, 6.77 ft, June 16, 1997, (backwater from the Snake River); no flow at times some years.
WATER-QUALITY RECORDS
PERIOD OF RECORD - Continuous water temperature data were collected May to September 1996, May to September 1999, May to September 2001, December 2001 to November 2002, April 2004 to September 2015 (discontinued after September 2015).
EXTREMES FOR PERIOD OF DAILY RECORD -
WATER TEMPERATURE: Maximum, 34.2°C June 27, 2015; minimum, 0.0°C many days during winter months.
