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Water-Year Summary for Site 12025100

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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
63158 Stream level, NGVD(Mean)  

Water year 2020: 2019-10-01 to 2020-09-30

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USGS Water-Year Summary 2020
LOCATION - Lat 46°39'40", long 122°58'58" referenced to North American Datum of 1927, in NE 1/4 NW 1/4 sec.31, T.14 N., R.2 W., Lewis County, WA, Hydrologic Unit 17100103, on right bank at City of Chehalis old (abandoned) wastewater treatment plant, 0.25 mi downstream from State Highway 6 bridge, and at mile 74.3.
DRAINAGE AREA - 618 mi².
PERIOD OF RECORD - Water years 1999, 2000 (annual maximum). October 2000 to current year (seasonal records).
GAGE - Water-stage recorder and crest-stage gage is NAVD of 1988. Prior to May 8, 2018 at same site at datum NGVD of 1929 (levels by Lewis County).
REMARKS - Elevation record only. Probably some diversion upstream for irrigation and domestic use. U.S. Geological Survey satellite telemeter at station. 
EXTREMES FOR PERIOD OF RECORD - Maximum elevation, 180.58 ft, Dec. 4, 2007, at datum then in use.