USGS Water-Year Summary 2020
06132000 MISSOURI RIVER BELOW FORT PECK DAM, MT
LOCATION - Lat 48°02'39.93", long 106°21'22.53" referenced to North American Datum of 1983, in NW 1/4 sec.6, T.26 N., R.42 E., McCone County, MT, Hydrologic Unit 10060001, on right bank 2 mi upstream from Milk River, 6 mi south of Nashua, 8 mi downstream from Fort Peck Dam, and at river mile 1,763.5.
DRAINAGE AREA - 56,490 mi².
- Water Supply Paper 1729: Drainage area.
PERIOD OF RECORD - March 1934 to current year.
GAGE - Water-stage recorder. Elevation of gage is 2,018 ft, referenced to the National Geodetic Vertical Datum of 1929 (U.S. Army Corps of Engineers bench mark). Prior to Apr. 14, 1938, at site 0.7 mi upstream at different elevation; Apr. 14, 1938, to Sept. 30, 1963, at present site at elevation 2.00 ft higher, all water-stage recorders. Since Oct. 1, 1969, published daily mean discharge is determined by flow meters and spillway discharge at Fort Peck Dam that is furnished by the U.S. Army Corps of Engineers.
COOPERATION - Beginning Oct. 1, 1969, records have been furnished by the U.S. Army Corps of Engineers; 2 to 4 discharge measurements are made each year and the records are reviewed by the U.S. Geological Survey. Records for March 1934 to September 1969 collected and computed by the U.S. Geological Survey.
EXTREMES FOR PERIOD OF RECORD - Maximum daily discharge, 65,900 ft³/s, June 15, 2011, furnished by U.S. Army Corps of Engineers; maximum gage height, 15.53 ft, June 13, 2011, at U.S.G.S. gaging station; maximum daily reverse flow, 400 ft³/s, Mar. 29, 1943, backwater from Milk River.
PERIOD OF RECORD - Water years 1964, 1975 to 1987, May 2002 to current year.
PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: Water years 1974 to 1981.
WATER TEMPERATURE: Water years, 1974 to 1979; seasonal records, July 2002 to current year.
INSTRUMENTATION - Temperature recorder installed July 31, 2002.
EXTREMES FOR PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE (water years 1975-81): Maximum daily, 1,080 microsiemens per centimeter (uS/cm), Nov. 30, 1976; minimum
daily, 520 uS/cm, June 29, 1978.
WATER TEMPERATURE: Maximum, 18.5°C, Aug. 10, Sept. 4, 19, 2002 and several days in August 2003; minimum, 0.0°C, on several
days from December 1977 to January 1978.
EXTREMES FOR CURRENT YEAR - WATER TEMPERATURE: During period of seasonal operation, maximum, 17.8°C, several days in July; minimum, -0.1°C, January 01.