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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.
- Not all sites have reports available for every water year.
USGS Water-Year Summary 2024
12324400 CLARK FORK ABOVE LITTLE BLACKFOOT RIVER, NEAR GARRISON, MT
LOCATION - Lat 46°30'39.28", long 112°47'22.87" referenced to North American Datum of 1983, in NE 1/4 NE 1/4 NE 1/4 sec.25, T.9 N., R.10 W., Powell County, MT, Hydrologic Unit 17010201, on left bank, on private road bridge, 0.7 mi upstream from Little Blackfoot River, 1.2 mi southeast of Garrison, and at river mile 446.4.
DRAINAGE AREA - 1,130 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - March 2009 to current year.
GAGE - Water-stage recorder. Elevation of gage is 4,350 ft referenced to the National Geodetic Vertical Datum of 1929.
REMARKS - Some regulation occurs from settling ponds on Silver Bow Creek near Warm Springs. Numerous diversions
for irrigation occur upstream from station.
WATER-QUALITY RECORDS
PERIOD OF RECORD - March 2009 to August 2009. March 2017 to current year.
PERIOD OF DAILY RECORD -
WATER TEMPERATURE: March 2017 to current year (seasonal records). TURBIDITY: October 2018 to current year (seasonal records)
INSTRUMENTATION -
Water temperature recorder installed March 27, 2017.
Turbidity sensor installed October 30, 2018.
REMARKS -
EXTREMES FOR PERIOD OF DAILY RECORD -
WATER TEMPERATURE: Maximum recorded, 24.2°C, August 5, 2019; minimum recorded, 2.5°C, September 30, 2019.
TURBIDITY: (seasonal record) Maximum, 219 formazin nephelometric units (FNU), May 21, 2020; minimum, 2.5 FNU, August 13, 2020.
