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USGS Water-Year Summary 2024
14123500 WHITE SALMON RIVER NEAR UNDERWOOD, WA
LOCATION - Lat 45°45'08", long 121°31'33" referenced to North American Datum of 1927, in NW 1/4 NW 1/4 sec.14, T.3 N., R.10 E., Skamania County, WA, Hydrologic Unit 17070105, on right bank 300 ft downstream from bridge, 1,000 ft downstream from PacifiCorp Condit powerhouse, 1.7 mi north of Underwood and at mile 1.9.
DRAINAGE AREA - 386 mi².
REVISIONS HISTORY -
WSP 484: 1915-17. WSP: 1348 1936-41(M). WSP 1638: Drainage area.
Revision: Annual maximum gage-height for water year 1917 was revised on Dec. 13, 2023, based on further review of the annual peak gage-height record.
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1912 to February 1913 (published as "at Condit Dam, near Underwood"), March 1915 to September 1930, September 1935 to current year.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 112.96 ft above NGVD of 1929. Prior to March 1913, reference point at dam 1 mi upstream at different datum. March 1915 to July 16, 1918, water-stage recorder at site 200 ft upstream at datum 3.24 ft higher and July 17, 1918 to Sept. 30, 1930, at datum 2.24 ft higher.
REMARKS - Diversions for irrigation of about 4,000 acres in Trout Lake area. Prior to Oct. 26, 2011, low and medium flows regulated by powerplant of PacifiCorp. Chemical analyses August 1960 to August 1961, water years 1964-68 (miscellaneous), October 1967 to September 1970 (monthly), November 1975 to June 1980; water temperatures July 1968 to August 1970.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 45,200 ft³/s, Feb. 8, 1996, result of flashboard failure on Condit Dam, gage height, 19.16 ft, from rating curve extended above 8,030 ft³/s, on basis of theoretical weir computation of peak flow; minimum discharge, practically no flow at times when powerplant was shut down; minimum daily discharge, 158 ft³/s, Jan. 17, 1950.
