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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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USGS Water-Year Summary 2024
06181000 POPLAR RIVER NEAR POPLAR, MT
LOCATION - Lat 48°07'04.50", long 105°11'34.14" referenced to North American Datum of 1983, in SW 1/4 NW 1/4 SW 1/4 sec.06, T.27 N., R.51 E., Roosevelt County, MT, Hydrologic Unit 10060003, on right bank on downstream side of road bridge , 0.3 miles north of US Highway 2 intersection with Road 1053 and at the intersection of Road 1053 and Poplar Park Road about 0.2 miles north of the town of Poplar MT.
DRAINAGE AREA - 3,170 mi².
REVISIONS HISTORY - WSP 1176. 1948. WSP 1389: 1911. WSP 1729: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - August 1908 to October 1924, August 1947 to September 1969, June 1975 to September 1979, October 1981 to current year. Monthly discharge only for some periods, published in Water Supply Paper (WSP) 1309.
GAGE - Water-stage recorder. Elevation of gage has not been determined. Prior to May 1, 1911, nonrecording gage at site 8.2 mi upstream at different datum. May 1, 1911, to Oct. 4, 1913, nonrecording gage at site 14 mi upstream at different elevation. Oct. 5, 1913, to Oct. 31, 1924, nonrecording gage at site 6.2 mi upstream at different datum. Aug. 10, 1947, to July 12, 2018, water-stage recorder at site 4.0 miles upstream at different datum.
REMARKS - Diversions for irrigation occur upstream from station. Flow is partially regulated
by Coronach Dam, on the East Fork Poplar River, 2 mi north of international boundary.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of July 10, 1946, reached a stage of 18.1 ft, from floodmark, discharge, 40,000 ft³/s, from slope-area measurement of peak flow made at site 20 mi upstream.
WATER-QUALITY RECORDS
PERIOD OF RECORD - Water years 1975-81, 1987-94, May 1999 to July 2013.
PERIOD OF DAILY RECORD - WATER TEMPERATURE: April 2000 to September 2003 (seasonal records).
REMARKS -
EXTREMES FOR PERIOD OF DAILY RECORD - WATER TEMPERATURE: Maximum, 33.0°C, Aug. 12, 18, 19, 2003; minimum, 0.0°C on many days during winter periods.
