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USGS Water-Year Summary 2024
06101500 MARIAS RIVER NEAR CHESTER, MT
LOCATION - Lat 48°18'21.46", long 111°04'49.90" referenced to North American Datum of 1983, in SW 1/4 SW 1/4 SW 1/4 sec.34, T.30 N., R.5 E., Liberty County, MT, Hydrologic Unit 10030203, on left bank 2.0 mi downstream from Tiber Dam, 4.4 mi upstream from Pondera Coulee, 15 mi southwest of Chester, and at river mile 78.3.
DRAINAGE AREA - 4,944 mi² of which 547 mi² probably is noncontributing.
REVISIONS HISTORY - WSP 1629: Drainage area. WDR MT-2013: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - April to September 1921, October 1945 to September 1947, October 1955 to current year. Monthly discharge only for some periods, published in Water Supply Paper (WSP) 1309.
GAGE - Water-stage recorder. Elevation of gage is 2,814.03 ft, referenced to the National Geodetic Vertical Datum of 1929 (Bureau of Reclamation bench mark). Prior to Oct. 1, 1921, nonrecording gage at bridge 2.5 mi downstream at different elevation. Oct. 4, 1945, to Sept. 30, 1946, nonrecording gage at site 3 mi downstream at different elevation. Bureau of Reclamation satellite telemeter is located at the station.
REMARKS - Flow is completely regulated by Lake Elwell (Tiber Dam) after Oct. 28, 1955.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of June 1948 reached a stage of 16 ft, present elevation.
EXTREMES FOR PERIOD OF RECORD - Minimum discharge probably less than 0.20 ft³/s on Nov. 10, 1955, during Tiber Dam shutdown.
