USGS Water-Year Summary 2021
12354500 CLARK FORK AT ST. REGIS, MT
LOCATION - Lat 47°18'05.90", long 115°05'12.73" referenced to North American Datum of 1983, in NW 1/4 SE 1/4 SW 1/4 sec.19, T.18 N., R.27 W., Mineral County, MT, Hydrologic Unit 17010204, on left bank at St. Regis, 0.4 mi downstream from St. Regis River, and at river mile 270.3.
DRAINAGE AREA - 10,728 mi².
- WSP 1246: Drainage area. WSP 1316: 1916-17; 1920; 1929-31, maximum discharge (M); 1933 (M).
PERIOD OF RECORD - October 1910 to current year. Monthly discharges only from 1924 to 1928 are published in Water Supply Paper (WSP) 1316.
GAGE - Water-stage recorder. Elevation of gage is 2,600.37 ft, referenced to the National Geodetic Vertical Datum of 1929 (levels by U.S. Army Corps of Engineers). Prior to Nov. 29, 1933, nonrecording gage at same site and elevation. U.S. Geological Survey data collection platform with satellite telemetry at station.
PERIOD OF RECORD - September 1998 to August 2003, April 2006 to current year.
PERIOD OF DAILY RECORD - WATER TEMPERATURE: April 2002 to September 2002.
EXTREMES FOR PERIOD OF DAILY RECORD - WATER TEMPERATURE (seasonal records): Maximum, 18.0°C, several days in July and August 2002; minimum, 3.5°C, Apr. 2 and 3, 2002.