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Water-Year Summary for Site 12340500

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Available Parameters
00060 Discharge(Mean)  
80154 Suspnd sedmnt conc(Mean)  
80155 Suspnd sedmnt disch(Mean)  

Water year 2020: 2020-10-01 to 2021-09-30
 

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USGS Water-Year Summary 2020
12340500 CLARK FORK ABOVE MISSOULA, MT
LOCATION - Lat 46°52'36.35", long 113°55'55.63" referenced to North American Datum of 1983, in NW 1/4 NW 1/4 NW 1/4 sec.19, T.13 N., R.18 W., Missoula County, MT, Hydrologic Unit 17010204, on right bank 0.2 mi downstream from county road bridge, 2.8 mi east of Missoula, 3.0 mi downstream from Blackfoot River, and at river mile 361.6.
DRAINAGE AREA - 6,021 mi².
REVISIONS HISTORY - WSP 1042: 1936. WSP 1152: 1942. WSP 1246: 1929-30; 1935, drainage area. WSP 1316: 1932-33.
SURFACE-WATER RECORDS
PERIOD OF RECORD - March 1929 to current year. Monthly discharge only for some periods, published in Water Supply Paper (WSP) 1316.
GAGE - Water-stage recorder. Elevation of gage is 3,198.30 ft, referenced to the National Geodetic Vertical Datum of 1929 (levels by U.S. Army Corps of Engineers). Prior to May 27, 1929, nonrecording gage. May 27, 1929, to July 13, 2018, at site 180 ft upstream at same datum. 
REMARKS -
11-20-2019 to 03-03-2020: records are good, except estimated records are poor.
08-19-2019 to 11-20-2019: records are good, except estimated records are poor.
10-03-2018 to 08-19-2019: records are good, except estimated records are poor.
11-01-2017 to 10-03-2018: records are good, except estimated records are poor.
10-04-2016 to 10-31-2017: records are good, except estimated records are poor. 
10-26-2015 to 10-03-2016: records are good, except estimated records are poor.
10-08-2014 to 10-25-2015: records are good, except estimated records are poor.
10-01-2013 to 10-07-2014: records are good, except estimated records are poor. 

Diurnal fluctuations caused by powerplant at Milltown ended with removal of Milltown Dam on 
March 28, 2008.  Diversions for irrigation of about 120,000 acres occur upstream from station. 
EXTREMES OUTSIDE PERIOD OF RECORD - Flood in June 1908 reached a discharge of 48,000 ft³/s, provided by The Montana Power Company.
WATER-QUALITY RECORDS
PERIOD OF RECORD - Water years 1969-71, 1977-83, 1986 to current year. Water years 1969-71 samples collected 3.4 miles downstream from gaging station.
PERIOD OF DAILY RECORD -
WATER TEMPERATURE: June 1977 to September 1983, February 2002 to September 2002.
TURBIDITY:  April to September 2007.
SUSPENDED-SEDIMENT DISCHARGE: July 1986 to April 1987, June 1988 to January 1996, March 1996 to 
March 2003, August 2003 to current year.
REMARKS -
SUSPENDED SEDIMENT
10-01-2015 to 09-30-2016: records are good, except during periods of estimated discharge.
EXTREMES FOR PERIOD OF DAILY RECORD -
WATER TEMPERATURE: Maximum, 22.5°C, Aug. 7, 8, 1983, July 13-15, 2002; minimum, 0.0°C on many days 
during winter periods.
TURBIDITY:  During period of seasonal collection, maximum, 55 FNU, May 4, 2007; minimum, 1.0 FNU, 
July 21-24, 2007.
SEDIMENT CONCENTRATION: Maximum daily mean, 1,060 mg/L, May 20, 2008; minimum daily mean, 1 mg/L, 
on many days.
SEDIMENT LOAD: Maximum daily, 46,400 tons, May 20, 2008; minimum daily, 1.6 tons, Dec. 27, 1992.
EXTREMES FOR CURRENT YEAR - SEDIMENT CONCENTRATION: Maximum daily mean, 95 mg/L, February 16, 2016; minimum daily mean, 1 mg/L, Several days in July 2016. SEDIMENT LOAD: Maximum daily, 1,390 tons, April 24, 2016; minimum daily, 4.4 tons, July 5-7, 2016.