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Water-Year Summary for Site 12354500

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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.
  • For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
  • For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
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Available Parameters
00060 Discharge(Mean)  

Water year 2021: 2021-10-01 to 2022-09-30
 

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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.
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 -
2020 Water Year: records are good, estimated records are poor. 
2019 Water Year: records are good.
2018 Water Year: records are good. 
2017 Water Year: records are good.
2016 Water Year: records are good, estimated records are fair. 
2015 Water Year: records are good.
2014 Water Year: records are good. 

Diversions for irrigation of about 244,000 acres 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.