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Water-Year Summary for Site 12322001

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Available Parameters
00060 Discharge(Mean)  
30208 Discharge(Mean) [m^3/s]  

Water year 2023: 2022-10-01 to 2023-09-30
 

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USGS Water-Year Summary 2023
12322001 KOOTENAI RIVER AT PORTHILL, ID (TOTAL FLOW)
LOCATION - Lat 49°00'00", long 116°30'10" referenced to North American Datum of 1927, Boundary County, ID, Hydrologic Unit 17010104,
SURFACE-WATER RECORDS
PERIOD OF RECORD - April 1928 to current year.
REMARKS - Daily discharge represents entire flow passing the international boundary. This record gives total flow of Kootenai River at Porthill, ID (12322000) and Boundary Creek (12321500). Formerly published under Site ID 12322000. From October 1989 to December 2003 computations were made using USGS Branch model. Beginning Jan. 2004, velocity data from an acoustic doppler velocity meter (ADVM) has been used to compute the discharge record. Flow regulated by Libby Dam started on Mar. 21, 1972.
EXTREMES FOR PERIOD OF RECORD - UNREGULATED PERIOD (1929-71): Maximum daily discharge prior to regulation by Libby Dam, 125,000 ft³/s June 1, 1948; maximum elevation, 1,767.61 ft, June 7, 1961; minimum daily discharge, 1,380 ft³/s Feb. 8, 1936; minimum elevation, 1,738.21 ft, Apr. 3, 1944. REGULATED PERIOD (1972 to current year): Maximum daily discharge since regulation began, 62,700 ft³/s June 20, 2006, maximum elevation, 1,758.84 ft, June 2, 1972; minimum daily discharge, 2,610 ft³/s Jan. 9, 1973.