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Water-Year Summary for Site 12020800

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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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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
12020800 SOUTH FORK CHEHALIS RIVER NEAR WILDWOOD, WA
LOCATION - Lat 46°26'42", long 123°04'57" referenced to North American Datum of 1927, in NW 1/4 NE 1/4 sec.17, T.11 N., R.3 W., Lewis County, WA, Hydrologic Unit 17100103, on left bank at Wildwood Road bridge, 0.4 mi downstream from Black Creek, 1.2 mi southeast of Wildwood, and at mile 16.2.
DRAINAGE AREA - 27 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1998 to current year (seasonal records).
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is NAVD of 1988 (USGS GNSS Level II survey). Prior to May 1, 2018 at same site at datum NGVD of 1929, 1.27 ft lower (levels by Lewis County).
REMARKS - No regulation or diversion upstream from station. U.S. Geological Survey satellite telemeter at station. 
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Feb. 8, 1996, reached a stage of 363.57 ft from floodmarks, datum then in use, discharge, 5,620 ft³/s, from rating curve extended above 2,600 ft³/s.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 12,200 ft³/s, Dec. 3, 2007, gage height, 365.98 ft, datum then in use; minimum discharge, 3.47 ft³/s, Oct. 11-17, 2022.