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Water-Year Summary for Site 12324590

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Available Parameters
00060 Discharge(Mean)  

Water year 2018: 2017-10-01 to 2018-09-30
 

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USGS Water-Year Summary 2018
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 -
11-01-2017 to 10-24-2018: records are good, except estimated records are poor.
11-21-2016 to 10-31-2017: records are good, except estimated records are poor.
10-09-2015 to 11-20-2016: records are good, except estimated records are poor.
10-01-2014 to 10-08-2015: records are good, except estimated records are poor.
10-01-2013 to 09-30-2014: records are good, except estimated records are poor. 

A few minor irrigation reservoirs are located in the upper reaches of the drainage. Diversions for 
irrigation include about 11,000 acres 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REMARKS - Several unpublished observations of specific conductance and water temperature were made during the year.
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.