USGS Water-Year Summary for Site 06306300

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00060 Discharge(Mean)
	00095 Specific cond at 25C(Max.,Min.,Mean)

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Water year 2024: 2024-10-01 to 2025-09-30

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USGS Water-Year Summary 2024

06306300 TONGUE RIVER AT STATE LINE, NEAR DECKER, MT

LOCATION - Lat 45°00'32.89", long 106°50'09.40" referenced to North American Datum of 1983, in NW 1/4 NW 1/4 NE 1/4 sec.33, T.9 S., R.40 E., Big Horn County, MT, Hydrologic Unit 10090101, on left bank 1 mi north of Wyoming-Montana State line, 1.4 mi southeast of Decker, 1.6 mi upstream from Badger Creek, and at river mile 200.9.

DRAINAGE AREA - 1,451 mi².

REVISIONS HISTORY - Water Data Report MT-04-1: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - August 1960 to current year. Records published as "near Decker" May 1928 to September 1938, not equivalent owing to intervening drainage area.

GAGE - Water-stage recorder. Elevation of gage is 3,429.14 ft, referenced to the National Geodetic Vertical Datum of 1929 (levels by U.S. Army Corps of Engineers).

REMARKS -

WATER-QUALITY RECORDS

PERIOD OF RECORD - Water years 1966 to current year.

PERIOD OF DAILY RECORD -

SPECIFIC CONDUCTANCE: October 1965 to September 1976, November 1980 to December 1986 (observer daily 
samples); August 2000 to November 2017 (electronic records).
WATER TEMPERATURE: October 1965 to September 1976.

INSTRUMENTATION - Specific conductance probe was installed Aug. 21, 2000.

REMARKS -

SPECIFIC CONDUCTANCE
03-14-2016 to 11-9-2016 (seasonal record): records are excellent, except Apr. 23-28, Aug. 20-25, 
and Sept. 25 are good; Sept. 25 are fair; and Sept. 26 to Oct. 14 are poor.   

03-25-2015 to 11-19-2015 (seasonal record): records are excellent, except records from Oct. 20-29, 
May 7-10, June 5-17, July 1-9, Sept. 15-21, and Oct. 7-11, are good; records from Apr. 23 to May 6, 
May 11-19, July 10-16, and Oct. 12-21 are fair; and records from May 20-26 are poor.

04-09-2014 to 10-31-2014 (seasonal record): records are excellent, except records from Apr. 25-29, 
May 18-23, June 26 to July 9, July 21-23, and Aug. 23-30 are good; records from Apr. 30 to May 3, 
May 24-27, and Aug. 31 to Sept. 4 are fair; and records from May 4-15, May 28 to June 4, and 
Sept. 5-22 are poor.

EXTREMES FOR PERIOD OF DAILY RECORD -

SPECIFIC CONDUCTANCE: Maximum daily, 1,490 microsiemens per centimeter (uS/cm) at 25.0°C, Aug. 12, 
1966, Jan. 11, 1972;  minimum, 161 uS/cm at 25.0°C, May 30 and June 1, 2003 and May 24 and 25, 2006.
WATER TEMPERATURE: Maximum, 30.5°C, July 16, 1966; minimum, 0.0°C on many days during winter.

EXTREMES FOR CURRENT YEAR - SPECIFIC CONDUCTANCE: Maximum recorded, 867 uS/cm at 25.0°C, August 30, 2013; minimum recorded, 226 uS/cm at 25.0°C, June 12, 2013.