USGS Water-Year Summary for Site 12031000

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	Available Parameters
	00060 Discharge(Mean)
	00065 Gage height(Mean)

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Water year 2024: 2024-10-01 to 2025-09-30

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USGS Water-Year Summary 2024

12031000 CHEHALIS RIVER AT PORTER, WA

LOCATION - Lat 46°56'22", long 123°18'47" referenced to North American Datum of 1927, in SW 1/4 SE 1/4 sec.21, T.17 N., R.5 W., Grays Harbor County, WA, Hydrologic Unit 17100103, at downstream end of left bank bridge pier, 30 ft downstream from Porter Creek, 0.1 mi west of Porter, and at mile 33.3.

DRAINAGE AREA - 1,294 mi².

REVISIONS HISTORY - WDR-US-2013: 2007, 2008, 2009 Daily discharges and totals. WDR-WA-2008: 1983. WSP 1716: Drainage area. WSP 1932: 1954, 1956, 1960(M).

SURFACE-WATER RECORDS

PERIOD OF RECORD - January 1952 to September 1972, water years 1973-75 (annual maximum), May 1975 to September 1985, October 1985 to September 1986 (monthly means only), October 1986 to current year. Daily routed values for October 1985 to September 1986 are available in the files of the U.S. Geological Survey.

GAGE -

Water-stage recorder and crest-stage gage. Datum of gage is NAVD of 1988 (USGS differential survey). Prior to May 10, 2018, at present site at datum 23.64 ft above NGVD of 1929.

REMARKS - 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. Suspended sediment October 1961 to September 1971. Water temperatures July 1959 to September 1960, October 1961 to July 1972. Chemical analyses July 1959 to September 1973, October 1974 to September 1994.

EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Dec. 28, 1937, reached a stage of 24.7 ft, from levels by Grays Harbor County. Flood of December 1933 reached a stage of 23.13 ft, from river profile by Corps of Engineers.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 86,500 ft³/s, (revised), Dec. 5, 2007, gage height, 26.06 ft; minimum discharge, 164 ft³/s, Oct. 17, 1952, gage height, 2.25 ft.

WATER-QUALITY RECORDS

PERIOD OF DAILY RECORD - TURBIDITY: December 2018 to current year.

INSTRUMENTATION - Turbidity sensor (Observator Analite NEP-5000) interfaced with a Data Collection Platform/Electronic Datalogger, with 15-minute logging interval, since December 2018. Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government.

REMARKS - Additional details are available from the Washington Water Science Center. Continuous water quality record is no longer rated, as of water year 2020. Prior ratings can be obtained via request to the Washington Water Science Center.

EXTREMES FOR PERIOD OF DAILY RECORD - TURBIDITY: Maximum, 314 FNU, Mar. 1, 2022; minimum, 0.2 FNU, Aug. 6, 10, 2021, Aug. 20, 2023.