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Water-Year Summary for Site 12334510

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  • Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
  • For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
  • For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
  • For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
  • Not all sites have reports available for every water year.
Available Parameters
00010 Temperature, water(Max.,Min.,Mean)  
00060 Discharge(Mean)  

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

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USGS Water-Year Summary 2023
LOCATION - Lat 46°43'20.41", long 113°40'59.02" referenced to North American Datum of 1983, in NW 1/4 NE 1/4 SW 1/4 sec.12, T.11 N., R.17 W., Missoula County, MT, Hydrologic Unit 17010202, on left bank 100 ft downstream from private road bridge, 0.2 mi upstream from mouth, and 3.7 mi southeast of Clinton.
DRAINAGE AREA - 889 mi².
REVISIONS HISTORY - The maximum discharge and gage height for water year 2010 were revised on May 11, 2021, based on reanalysis of gage height record.
PERIOD OF RECORD - October 1972 to current year.
GAGE - Water-stage recorder. Elevation of gage is 3,519.46 ft, referenced to the National Geodetic Vertical Datum of 1929.
REMARKS - Some regulation occurs upstream by East Fork Rock Creek Reservoir.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood in June 1972 reached a stage of 8.52 ft, from floodmark, discharge, 6,500 ft³/s; local residents report flood of 1927 reached a stage of about 9.5 ft.
EXTREMES FOR PERIOD OF RECORD - Instantaneous low flow may have been leass during period of ice affect.
PERIOD OF DAILY RECORD - WATER TEMPERATURE: September 1979 to September 1983, April 1995 to September 2002, (seasonal record) October 2004 to current year.
INSTRUMENTATION - Water temperature probe was installed in April 1995.
EXTREMES FOR PERIOD OF DAILY RECORD - WATER TEMPERATURE: Maximum, 23.0°C, Aug. 1, 2000; minimum, 0.0°C, on many days during winter periods.