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Water-Year Summary for Site 12344000

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  • Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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Available Parameters
00010 Temperature, water(Max.,Min.,Mean)  
00060 Discharge(Mean)  

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

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USGS Water-Year Summary 2019
12344000 BITTERROOT RIVER NEAR DARBY, MT
LOCATION - Lat 45°58'19.38", long 114°08'28.44" referenced to North American Datum of 1983, in SW 1/4 SE 1/4 NE 1/4 sec.36, T.3 N., R.21 W., Ravalli County, MT, Hydrologic Unit 17010205, on left bank 50 ft upstream from bridge on U.S. Highway 93, 0.3 mi downstream from Chaffin Creek, 4.1 mi southeast of Darby, and at river mile 77.2.
DRAINAGE AREA - 1,050 mi².
REVISIONS HISTORY - WSP 1246: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - April 1937 to current year. Monthly discharge only for April 1937, published in Water Supply Paper (WSP) 1316.
GAGE - Water-stage recorder. Elevation of gage is 3,942.14 ft, referenced to the National Geodetic Vertical Datum of 1929. Prior to Oct. 1, 1987, at elevation 1.00 ft higher. Prior to Aug. 2, 1939, nonrecording gage at highway bridge 45 ft upstream at same elevation.
REMARKS -
10-31-2017 to 12-03-2018: records are good, except estimated records are poor.
12-02-2016 to 10-31-2017: records are good, except estimated records are poor.
10-27-2016 to 12-01-2016: records are good, except estimated records are poor.
10-07-2014 to 10-26-2015: records are good, except estimated records are poor.
10-01-2013 to 10-06-2014: records are good, except records from May 8-15 are fair.

Some regulation occurs by Painted Rocks Lake (station number 12342000). Diversions for irrigation of
about 5,000 acres occur upstream from station. Ditch bypassing station irrigates about 500 acres
downstream from station.
WATER-QUALITY RECORDS
PERIOD OF DAILY RECORD -
WATER TEMPERATURE: Seasonal records for 2001-2003; full year records from water years 2004-2006, 2008; 
2013-current(seasonal).
INSTRUMENTATION - New water temparature probe was installed on Feb. 24, 2015.
REMARKS -
WATER TEMPERATURE
06/01/2018 to 09/30/2018 (seasonal record): records are excellent.
06/01/2017 to 09/30/2017 (seasonal record): records are excellent. 
06/01/2016 to 10/07/2016 (seasonal record): records are excellent. 
06/23/2015 to 10/27/2015 (seasonal record): records are excellent.  
07/08/2014 to 09/30/2014 (seasonal record): records are excellent

EXTREMES FOR PERIOD OF DAILY RECORD -
WATER TEMPERATURE Maximum, 24.5°C, Aug. 8, 2001; minimum, 0.0°C during winter periods.