USGS Water-Year Summary 2019
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.
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. Prior to May 1, 2018 at same site at datum NGVD of 1929 (levels by Lewis County).
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, 4.5 ft³/s, Oct. 17-19, 2002.