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Water-Year Summary for Site 12143600

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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.
  • For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
  • For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
  • Not all sites have reports available for every water year.
Available Parameters
00060 Discharge(Mean)  
00065 Gage height(Mean)  

Water year 2023: 2022-10-01 to 2023-09-30
 
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USGS Water-Year Summary 2023
12143600 SOUTH FORK SNOQUALMIE RIVER AT EDGEWICK, WA
LOCATION - Lat 47°27'10", long 121°43'00" referenced to North American Datum of 1927, in NE 1/4 NE 1/4 sec.25, T.23 N., R.8 E., King County, WA, Hydrologic Unit 17110010, on right bank at upstream side of highway bridge in Edgewick, 3 mi downstream from Change Creek, and at mile 8.6.
DRAINAGE AREA - 65.9 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - July to September 1962, March 1963 to September 1965, October 1983 to current year.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 574.30 ft above NAVD of 1988 (USGS GNSS Level II survey May 26, 2021) and 571.24 ft above NGVD of 1929. Prior to August 3, 1983, gage at site 45 ft downstream at datum 5.90 ft higher. Prior to March 17, 2004, gage at site on left bank at same datum.
REMARKS - Minor regulation at Twin Falls and Weeks hydroelectric projects, upstream from station. No diversions. U.S. Geological Survey satellite telemeter at station. 
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 16,500 ft³/s, Nov. 6, 2006, gage height, 15.32 ft; minimum daily discharge, 37.9 ft³/s, Oct. 17, 2022.