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USGS Water-Year Summary 2024
06115200 MISSOURI RIVER NEAR LANDUSKY, MT
LOCATION - Lat 47°37'53.15", long 108°41'15.88" referenced to North American Datum of 1983, in NW 1/4 NE 1/4 sec.31, T.22 N., R.24 E., Fergus County, MT, Hydrologic Unit 10040104, C. M. Russell National Wildlife Refuge, on right bank 380 ft upstream from bridge on U.S. Highway 191, 0.9 mi upstream from Armells Creek, 20 mi south of Landusky, and at river mile 1,921.61.
DRAINAGE AREA - 40,649 mi² of which 821 mi² probably is noncontributing. revised. Area at site used prior to Dec. 13, 1968, 40,763 mi².
REVISIONS HISTORY - WSP 1729: Drainage area. WDR MT-2013: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - February 1934 to current year. Prior to October 1968, published as "at powerplant ferry, near Zortman."
GAGE - Water-stage recorder. Elevation of gage is 2,239.96 ft, referenced to the National Geodetic Vertical Datum of 1929 (State Highway bench mark). Prior to Feb. 7, 1935, nonrecording gage, and Feb. 7, 1935, to Dec. 12, 1968, water-stage recorder, at site 16.5 mi upstream at elevation 33.06 ft higher.
REMARKS - Flow is regulated by 24 smaller irrigation reservoirs and powerplants, Clark Canyon Reservoir
(station number 06015300), Canyon Ferry Lake (station number 06058500), and Lake Elwell
(station number 06101300). Numerous diversions for irrigation occur upstream
from station.
WATER-QUALITY RECORDS
PERIOD OF RECORD - Water years 1972 to current year.
PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: March 1979 to September 1981. WATER TEMPERATURE: March to September 1979, October 2004 to September 2005, April 2011 to current (seasonal record). SUSPENDED-SEDIMENT DISCHARGE: October 1971 to September 1991, October 1991 to September 2006 (seasonal records, March through November), discontinued.
REMARKS - Prior to July 1972, sampling and record computations were under supervision of U.S. Army Corps
of Engineers.
EXTREMES FOR PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE (water years 1979-81): Maximum daily, 1,240 microsiemens per centimeter (uS/cm), June 20, 1979; minimum daily, 410 uS/cm, July 3, 1980. WATER TEMPERATURE: Maximum, 28.5°C, on Jul. 3, 2013; minimum, 0.0°C, on many days during winter period. SEDIMENT CONCENTRATION: Maximum daily mean, 27,400 mg/L, June 22, 1976; minimum daily mean, 2 mg/L, Dec. 21, 1983. SEDIMENT LOAD: Maximum daily, 1,680,000 tons, June 22, 1976; minimum daily, 33 tons, Dec. 21, 1983.
