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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
12324590 LITTLE BLACKFOOT RIVER NEAR GARRISON, MT
LOCATION - Lat 46°31'10.14", long 112°47'35.42" referenced to North American Datum of 1983, in NE 1/4 NW 1/4 SE 1/4 sec.24, T.9 N., R.10 W., Powell County, MT, Hydrologic Unit 17010201, on right bank 20 ft upstream from bridge on frontage road, 0.7 mi southeast of Garrison, and at river mile 0.5.
DRAINAGE AREA - 414 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1972 to current year, seasonal records only for water year 2007.
GAGE - Water-stage recorder. Elevation of gage is 4,347.73 ft, referenced to the North American Vertical Datum of 1988. Prior to Oct. 1, 1992, at site 3.5 mi upstream at different elevation.
REMARKS - A few minor irrigation reservoirs are located in the upper reaches of the drainage. Numerous diversions for
irrigation occur upstream from station.
WATER-QUALITY RECORDS
PERIOD OF RECORD - Water years 1963, 1985 to current year.
PERIOD OF DAILY RECORD -
WATER TEMPERATURE: October 1999 to September 2003.
REMARKS -
EXTREMES FOR PERIOD OF DAILY RECORD -
WATER TEMPERATURE: Maximum, 25.5°C, July 29, 30, Aug. 1, 2, 2000; minimum, 0.0°C on many days during winter period.
