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USGS Water-Year Summary 2024
12193400 BAKER RIVER AT HENRY THOMPSON BRIDGE AT CONCRETE, WA
LOCATION - Lat 48°32'26", long 121°44'32" referenced to North American Datum of 1927, in NW 1/4 NW 1/4 sec.11, T.35 N., R.8 E., Skagit County, WA, Hydrologic Unit 17110005, on left bank 50 ft downstream from Henry Thompson Bridge, 0.2 mi northeast of Concrete, 0.3 mi downstream from Baker River powerplant and mile 0.7.
DRAINAGE AREA - 297 mi².
REVISIONS HISTORY - WSP 1286: 1911-13(M), 1945-46, drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - September 1910 to March 1915, September 1943 to September 2008 (published as Baker River at Concrete, 12193500), October 2008 to current year.
GAGE - Water-stage recorder. Datum of gage is 170 ft above the National Geodetic Vertical Datum of 1929 and 174.08 ft above North American Vertical Datum of 1988. NAVD 88 datum (USGS level 2 GNSS survey). Prior to Mar. 5, 1915, non-recording gage at site 0.2 mi downstream at different datum. Sept. 1, 1943, to Jan. 22, 1958, water-stage recorder at site 700 ft. upstream at datum 172.6 ft. above NGVD of 1929 (from river-profile survey). Jan. 23 to June 11, 1958, powerplant record. Supplementary water-stage recorder on left bank about 40 ft. downstream from fish barrier and on tailrace of powerhouse at same datum. Recording gage installed on October 1, 2007, 300 ft. upstream of concrete weir at same datum.
COOPERATION - Puget Sound Energy provided streamflow data from dam upstream during period of backwater.
REMARKS - All diversions returned to river upstream from gage; at times, power generation is shut down for maintenance at Baker River or the fish-barrier dam causing the stage to drop below the control. Water is released through a valve-controlled pipe to the fish ladder located on the left bank just downstream from the gage and control. Flow regulated by Baker Lake (station 12191600) since July 1959 and Shannon Lake (station 12193000) since November 1925. U.S. Geological Survey satellite telemeter at station.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 36,600 ft³/s Nov. 19, 1962, elevation, 186.6 ft, computation of peak flow over dam; minimum daily discharge, 30 ft³/s Mar. 21-26, 1973, Apr. 26-28, May 7-9, 11, 1983, Apr. 20, 24-28, 1986.
