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USGS Water-Year Summary 2024
13046000 HENRYS FORK NEAR ASHTON, ID
LOCATION - Lat 44°04'11", long 111°30'38" referenced to North American Datum of 1983, in sec.33, T.9 N., R.42 E., Fremont County, ID, Hydrologic Unit 17040203, Lemon Lake quad, on left bank 0.8 mi downstream from power-plant, 3.1 mi west of Ashton, at mile 44.2.
DRAINAGE AREA - 1,097 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - April 1890 to June 1891, August 1902 to June 1909, April 1920 to current year (seasonal records only 1920-26). Monthly discharge only for some periods, published in WSP 1317. Published as "Henrys Fork in canyon, above Fall River", 1890-91, and as "North Fork of Snake River near Ora", 1902-09. Published as station 13046023 from 1981-92.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 5,093.49 feet above NAVD 1988 (USGS). April 1890 to June 1891, nonrecording gage at site 5.5 mi downstream at different datum. August 1902 to Apr. 15, 1921, nonrecording gage, and Apr. 16, 1921 to May 3, 1930, water-stage recorder, at site 1.0 mi. downstream at different datum. May 3, 1930 to Sept. 30, 1980, water-stage recorder at site 0.5 mi. upstream at different datum.
REMARKS - Diurnal fluctuation caused by power plant above station. Flow regulated by Henrys Lake (see station 13039000), Island Park Reservoir, and by Ashton Dam, 0.8 mi upstream. Diversions above station for irrigation of about 24,500 acres (1966 determination).
EXTREMES FOR PERIOD OF RECORD - UNREGULATED PERIOD (1890-1922): Maximum discharge prior to regulation, 6,000 ft³/s May 8, 1890; minimum daily, 910 ft³/s Feb. 4, 1906.
REGULATED PERIOD (1923 to current year): Maximum discharge since regulation began, 8,140 ft³/s May 15, 1984, gage height, 6.50 ft; minimum, 53 ft³/s Sept. 20, 1960, gage height, 5.45 ft, site and datum then in use; minimum daily, 171 ft³/s Oct. 18, 1961.
