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Water-Year Summary for Site 12340000

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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)  
80154 Suspnd sedmnt conc(Mean)  
80155 Suspnd sedmnt disch(Mean)  

Water year 2020: 2019-10-01 to 2020-09-30
 

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USGS Water-Year Summary 2020
12340000 BLACKFOOT RIVER NEAR BONNER, MT
LOCATION - Lat 46°53'57.88", long 113°45'22.75" referenced to North American Datum of 1983, in SE 1/4 SE 1/4 NW 1/4 sec.09, T.13 N., R.17 W., Missoula County, MT, Hydrologic Unit 17010203, on right bank 5.0 mi downstream from Union Creek, 5.6 mi northeast of Bonner, and at river mile 7.9.
DRAINAGE AREA - 2,287 mi².
REVISIONS HISTORY - WSP 1216: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - July to November 1898, March 1899 to September 1901, May 1903 to January 1905, March to October 1905, October 1939 to current year. Monthly discharge only for some periods, published in Water Supply Paper (WSP) 1316. Published as "at Bonner" 1898-99 and as Big Blackfoot near Bonner 1903-05.
GAGE - Water-stage recorder. Elevation of gage is 3,344.76 ft, referenced to the National Geodetic Vertical Datum of 1929. July 7, 1898 to June 30, 1901, and May 15, 1903 to Oct. 31, 1905, nonrecording gage at site 7 mi downstream at different elevation. Oct. 4, 1939 to Sept. 30, 1955, nonrecording gage at site 1.3 mi downstream at elevation 21.82 ft lower.
REMARKS -
11/20/2019 to 10/15/2020: 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.
11/02/2017 to 10/03/2018: records are good, except estimated records are poor.
10/30/2016 to 11/01/2017: records are good, except estimated records are poor.
11/10/2015 to 10/29/2016: records are good, except estimated records are poor.
10/08/2014 to 11/09/2015: records are good, except estimated records are poor. 
10/01/2013 to 10/07/2014: records are good, except estimated records are poor.  

Flow is slightly regulated by Nevada Creek Reservoir (station number 12336500). Diversions for 
irrigation of about 20,000 acres occur upstream from station. 
WATER-QUALITY RECORDS
PERIOD OF RECORD - Water years 1956-59, 1985 to current year.
PERIOD OF DAILY RECORD -
WATER TEMPERATURE: October 1955 to September 1959, October 1999 to September 2003, October 2004 to 
current year (seasonal record 2007-2011 water years).

SUSPENDED-SEDIMENT DISCHARGE: July 1986 to April 1987, June 1988 to September 1995, October 2005 to 
current year.
REMARKS -
WATER TEMPERATURE
11-21-2019 to 10-15-2020: records are fair.
10-01-2018 to 11-20-2019: records are good.
10-01-2017 to 09-30-2018: records are good.
10-06-2016 to 09-30-2017: records are excellent.
11-11-2015 to 10-05-2016: records are excellent.
10-01-2014 to 11-10-2015: records are excellent.
10-01-2013 to 09-30-2014: records are excellent.  

Water-temperature records represent water temperature at sensor within 0.2 °C

SUSPENDED SEDIMENT
10-01-2015 to 09-30-2016: records are good.
10-01-2014 to 09-30-2015: records are good.
EXTREMES FOR PERIOD OF DAILY RECORD -
WATER TEMPERATURE: Maximum, 23.0°C, July 13-15 and 20, 2007; minimum, 0.0°C on many days during winter periods.
SEDIMENT CONCENTRATION: Maximum daily mean, 335 mg/L, May 19, 1991; minimum daily mean, 1 mg/L on many days.
SEDIMENT LOAD: Maximum daily, 14,500 tons, June 8, 2011; minimum daily, 0.49 ton, Dec. 7, 2005.