USGS Water-Year Summary 2022
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.
- WSP 1246: Drainage area.
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.
PERIOD OF DAILY RECORD - WATER TEMPERATURE: Seasonal records for 2001-2003; full year records from water years 2004-2006, 2008;
INSTRUMENTATION - New water temperature probe was installed on Feb. 24, 2015.
EXTREMES FOR PERIOD OF DAILY RECORD - WATER TEMPERATURE Maximum, 24.5°C, Aug. 8, 2001; minimum, 0.0°C during winter periods.