USGS Water-Year Summary for Site 12340000

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00060 Discharge(Mean)
	80154 Suspnd sedmnt conc(Mean)
	80155 Suspnd sedmnt disch(Mean)

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Water year 2024: 2024-10-01 to 2025-09-30

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USGS Water-Year Summary 2024

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 - Diversions for irrigation occurs 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 -

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.