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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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USGS Water-Year Summary 2024
12021800 CHEHALIS RIVER NEAR ADNA, WA
LOCATION - Lat 46°37'33", long 123°06'02" referenced to North American Datum of 1927, in NE 1/4 SE 1/4 sec.07, T.13 N., R.3 W., Lewis County, WA, Hydrologic Unit 17100103, on right bank at railroad bridge, 2.0 mi downstream from South Fork Chehalis River, 2.0 mi west of Adna, and at mile 86.0.
DRAINAGE AREA - 340 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1998 to September 2015 (seasonal stage-only records). October 2015 to current year (continuous-record station).
GAGE - Water-stage recorder. Datum of gage is NAVD of 1988 (USGS differential levels). Prior to May 8, 2018, water stage recorder at present site at datum NGVD of 1929 (levels by Lewis County).
REMARKS - Probably some diversion upstream for irrigation and domestic use. U.S. Geological Survey satellite telemeter at station.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Feb. 8, 1996, reached an elevation of 213.14 ft, from floodmark at site.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 25,800 cfs, Jan. 13, 2021, elevation, 209.60 ft at datum then in use; minimum discharge, 26.5 ft³/s, Sept. 6, 2018, elevation, 192.18 ft. Maximum
elevation, 215.31 ft at datum then in use, Dec. 3, 2007 (seasonal elevation record only)
