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USGS Water-Year Summary 2024
12194000 SKAGIT RIVER NEAR CONCRETE, WA
LOCATION - Lat 48°31'28", long 121°46'11" referenced to North American Datum of 1927, in SE 1/4 NE 1/4 sec.16, T.35 N., R.8 E., Skagit County, WA, Hydrologic Unit 17110007, on right bank at Dalles Bridge, 1.3 mi southwest of Concrete, 2.4 mi downstream from Baker River, and at mile 54.1.
DRAINAGE AREA - 2,737 mi². of which 400 mi² are in Canada.
REVISIONS HISTORY - WSP 1566: 1957. WSP 1736: 1948. WSP 1932: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - September 1924 to current year.
GAGE - Water-stage recorder. Datum of gage is 130.0 ft above National Geodetic Vertical Datum of 1929 and is 133.96 ft above North American Vertical Datum of 1988. Prior to Dec. 10, 1924, nonrecording gage 200 ft upstream and Dec. 10, 1924, to Sept. 30, 1937, water-stage recorder at present site; both gages at datum 12.7 ft higher.
REMARKS - Flow regulated by Ross Reservoir (station 12175000), Diablo Reservoir (station 12176500), Gorge Reservoir (station 12177700), Baker Lake (station 12191600), and Lake Shannon (station 12193000). Chemical analyses November 1970 to September 1971, October 1973 to September 1974. U.S. Geological Survey satellite telemeter at station.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of about 1815 reached a stage of 69.3 ft present datum, from floodmarks at site 200 ft upstream, estimated discharge is 510,000 ft³/s. Records of other floods, prior to establishment of station, are given in WSP 1527.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 166,000 ft³/s, Oct. 21, 2003, gage height, 42.21 ft; minimum discharge, probably less than 2,160 ft³/s, during period Oct. 1-24, 1925, when recorder was not operating and gates in Baker River Dam were first closed; minimum daily recorded, 2,360 ft³/s, Dec. 12, 1929.
