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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
- For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
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USGS Water-Year Summary 2024
12097500 GREENWATER RIVER AT GREENWATER, WA
LOCATION - Lat 47°09'13", long 121°38'04" referenced to North American Datum of 1927, in NE 1/4 NE 1/4 sec.10, T.19 N., R.9 E., King County, WA, Hydrologic Unit 17110014, on left bank at bridge crossing, 0.7 mi east of Greenwater, and at mile 1.1.
DRAINAGE AREA - 73.5 mi².
REVISIONS HISTORY - WSP 1716: 1947(M). WA-94-1: 1990(M), 1993(M). WSP 1932: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1911 to March 1912, May 1929 to September 1977, July 1980 to September 1993 (seasonal records), October 1993 to current year. Published as "near Enumclaw" 1911-12.
GAGE - Water-stage recorder. Datum of gage is 1724.81 ft above NAVD of 1988 (USGS GNSS2 survey completed Sept. 9, 2022), and 1,720 ft above NGVD of 1929 (from river-profile survey). Prior to Aug. 10, 1912, nonrecording gages at sites approximately 500 ft upstream at different datums. May 1, 1929, to Aug. 14, 1934, water-stage recorder at site 1,400 ft upstream at different datum. Aug. 17, 1934, to Sept. 30, 1977, water-stage recorder at site 500 ft upstream at different datum.
REMARKS - No regulation upstream from station. U.S. Geological Survey satellite telemeter at station.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Dec. 2, 1977, reached a stage of 9.8 ft former site and datum, from floodmarks, discharge, about 10,500 ft³/s.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 6,790 ft³/s Feb. 7, 2020, gage height, 9.41 ft, from rating curve extended above 2,400 ft³/s on basis of a slope-area measurement of peak flow Feb. 8, 1996; minimum discharge, 21 ft³/s Oct. 1-2, 2015.
