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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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USGS Water-Year Summary 2024
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.
REVISIONS HISTORY - WSP 1246: Drainage area. WSP 1316: 1916-17; 1920; 1929-31, maximum discharge (M); 1933 (M).
SURFACE-WATER RECORDS
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.
REMARKS - Numerous diversions for irrigation occur upstream from station.
WATER-QUALITY RECORDS
PERIOD OF RECORD - September 1998 to August 2003, April 2006 to current year.
PERIOD OF DAILY RECORD - WATER TEMPERATURE: April 2002 to September 2002.
REMARKS - Sampling was conducted this year as part of a supplemental sampling program for the lower Clark Fork basin to assess water quality and loads associated with the removal of Milltown Dam. Several unpublished observations of specific conductance and water temperature were made during the year.
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.
