USGS Water-Year Summary for Site 06178500

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

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Water year 2023: 2022-10-01 to 2023-09-30

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USGS Water-Year Summary 2023

06178500 EAST POPLAR RIVER AT INTERNATIONAL BOUNDARY

LOCATION - Lat 49°00'00.00", long 105°24'34.51" referenced to North American Datum of 1983, in SW 1/4 SW 1/4 sec.03, T.1 N., R.26 W., UNSPECIFIED, Hydrologic Unit is unknown, Lat 48°59'58.5", long 105°24'31.9" referenced to North American Datum of 1983, second meridian, in Saskatchewan, Hydrologic Unit 10060003, on left bank 10 ft north of international boundary, 400 ft southwest of Canadian East Poplar Port of Entry, 14 mi north of Scobey, and at river mile 21.9.

DRAINAGE AREA - 541 mi² of which 31 mi² probably is noncontributing.

REVISIONS HISTORY - Water Supply Paper 1389: 1932, 1939, 1942-43, 1947. Water Data Report 1983: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - March 1931 to current year (seasonal records only in most seasons prior to October 1974). Prior to March 1962, published as East Fork Poplar River at international boundary.

GAGE - Water-stage recorder and concrete control. Elevation of gage is 2,410.92 ft (International Boundary Commission Survey Datum). Prior to Oct. 5, 1953, water-stage recorder at site 80 ft upstream at same elevation.

REMARKS - After September 1975, flow is regulated by Morrison Dam at Cookson Reservoir 3.1 mi upstream.

WATER-QUALITY RECORDS

PERIOD OF RECORD - Water years 1964-65, 1975 to current year.

PERIOD OF DAILY RECORD -

SPECIFIC CONDUCTANCE: February 1982 to current year.
WATER TEMPERATURE: June 1975 to September 1983.

INSTRUMENTATION - Specific conductance monitor was installed in April 1995.

REMARKS -

EXTREMES FOR PERIOD OF DAILY RECORD -

SPECIFIC CONDUCTANCE: Maximum, 2,140 microsiemens per centimeter (uS/cm) at 25.0°C, Oct. 28 and 29, 
2009; minimum, 363 uS/cm at 25.0°C, July 2, 1991 (daily mean).
WATER TEMPERATURE: Maximum, 29.5°C, July 6, 1975, July 25, 26, 1978; minimum, 0.0°C on many days 
during winters most years.