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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.
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USGS Water-Year Summary 2024
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 - Some regulation occurs by Painted Rocks Lake (station number 12342000). Diversions for irrigation
upstream 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 temperature probe was installed on Feb. 24, 2015.
REMARKS -
EXTREMES FOR PERIOD OF DAILY RECORD - WATER TEMPERATURE Maximum, 24.5°C, Aug. 8, 2001; minimum, 0.0°C during winter periods.
