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USGS Water-Year Summary 2024
12113350 GREEN RIVER AT TUKWILA, WA
LOCATION - Lat 47°27'55", long 122°14'50" referenced to North American Datum of 1927, in NW 1/4 SW 1/4 sec.24, T.23 N., R.4 E., King County, WA, Hydrologic Unit 17110013, on left bank under Interurban Ave S bridge in Tukwila, 1.4 mi upstream from Black River, and at mile 12.4.
DRAINAGE AREA - 440 mi².
REVISIONS HISTORY - The minimum gage height for the period of record was revised on January 21, 2022, based on revision of reference gage reading made September 2, 1999.
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1960 to September 1984 (discharge). October 1998 to current year (stage only).
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is NGVD of 1929 (Corps of Engineers benchmark) and is 3.37 ft above NAVD of 1988 (USGS GNSS survey).
REMARKS - Flow regulated by Howard A. Hanson Reservoir (station 12105800) for flood control and during summer months to augment the natural river flow. Minor diversions and regulation on upstream tributaries. River stage is affected daily by backwater during high tide. Chemical analyses October 1967 to September 1970. U.S. Geological Survey satellite telemeter at station.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Nov. 24, 1959, reached a stage of 22.63 ft.
EXTREMES FOR PERIOD OF RECORD - Maximum gage height, 21.70 ft, Jan. 31, 1965; minimum gage height, 1.38 ft, July 20, 21, 2023.
