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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, NGVD29(Mean)  

Water year 2023: 2022-10-01 to 2023-09-30
 
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USGS Water-Year Summary 2023
12025100 CHEHALIS RIVER AT WASTEWATER TREATMENT PLANT, AT CHEHALIS, WA
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.
SURFACE-WATER RECORDS
PERIOD OF RECORD - Water years 1999, 2000 (annual maximum). October 2000 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 8, 2018, at same site at datum NGVD of 1929, 3.75 ft lower (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.