USGS Water-Year Summary for Site 06132000

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

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USGS Water-Year Summary 2023

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.

REVISIONS HISTORY - Water Supply Paper 1729: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - March 1934 to September 2021.

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.

REMARKS - Flow is completely regulated by Fort Peck Dam. Numerous diversions for irrigation occur upstream from station. Operational level in Fort Peck Lake was reached beginning 1944 water year.

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.

WATER-QUALITY RECORDS

PERIOD OF RECORD - Water years 1964, 1975 to 1987, May 2002 to September 2008.

PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: Water years 1974 to 1981. WATER TEMPERATURE: Water years, 1974 to 1979; seasonal records, August 2002 to September 2004.

INSTRUMENTATION - Temperature recorder installed July 31, 2002.

REMARKS -

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.