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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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USGS Water-Year Summary 2024
12035100 CHEHALIS RIVER NEAR MONTESANO, WA
LOCATION - Lat 46°57'45", long 123°36'12" referenced to North American Datum of 1927, in NE 1/4 SW 1/4 sec.18, T.17 N., R.7 W., Grays Harbor County, WA, Hydrologic Unit 17100104, on downstream side of State Highway 107 bridge, 0.2 mi upstream from Wynoochee River, 1.1 mi south of Montesano and at mile 13.2.
DRAINAGE AREA - 1,780 mi².
REVISIONS HISTORY - WDR-US-2010: 2002-2009 maximum and minimum (daily) elevation.
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 2001 to current year.
GAGE - Water-stage recorder. Datum of gage is NAVD of 1988.
REMARKS - Elevation record only. Large diurnal fluctuation because of tides. Minor effect from regulation on Skookumchuck River by Skookumchuck Dam since January 1971. Up to 54 ft³/s of Skookumchuck River is consumptively used at Centralia steam generating plant. Many small diversions for irrigation and domestic use upstream from station, including about 3 ft³/s for municipal water supply for Centralia and Chehalis. U.S. Geological Survey satellite telemeter at station. Chemical analyses, March 1970 to September 1971, October 1977 to June 1980.
EXTREMES FOR PERIOD OF RECORD - Maximum recorded elevation, 19.47 ft, Jan. 8, 2009; minimum recorded elevation, -4.52 ft, July 22, 2009, but may have been lower during period of no elevation record.
