USGS Water-Year Summary for Site 12119000

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	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

12119000 CEDAR RIVER AT RENTON, WA

LOCATION - Lat 47°28'58", long 122°12'08" referenced to North American Datum of 1927, in SW 1/4 NW 1/4 sec.17, T.23 N., R.5 E., King County, WA, Hydrologic Unit 17110012, on downstream side of bridge on Mill Avenue at Renton, and at mile 1.6.

DRAINAGE AREA - 184 mi². includes 3.67 mi² in vicinity of Youngs Lake in Big Soos Creek basin, excludes 1.9 mi² from upper Rock Creek, Cedar River basin, normally diverted into Issaquah Creek.

REVISIONS HISTORY - WSP 1316: 1901-02. WSP 1932: Drainage area. WDR WA-75-1: 1972-74.

Revisions: Gage height and discharge for the period Feb. 7 and 8, 2020, were revised on Mar. 17, 2020, based on the removal of two erroneous spikes.

SURFACE-WATER RECORDS

PERIOD OF RECORD - March 1901 to July 1903 (fragmentary), September 1906 to December 1907 (monthly discharge only), August 1945 to current year.

GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 18.77 ft above NAVD88 and 15.20 ft above NGVD of 1929. Prior to Jan. 1, 1908, nonrecording gages within 1 mi of present site, at datum 10.67 ft above NGVD of 1929. Aug. 7, 1945 to Aug. 15, 1947, water-stage recorder at site 700 ft upstream at datum 20.13 ft above NGVD of 1929, Aug. 16, 1947, to Dec. 7, 1950, at datum 19.13 ft above NGVD of 1929, and Dec. 8, 1950 to Sept. 24, 2015, water stage recorder 125 ft downstream at present datum.

REMARKS -

Flow partly regulated by Chester Morse Lake and Masonry Dam for operation of powerplant at Cedar Falls 32.1 mi upstream from gage. Chemical analyses July 1959 to August 1964, December 1965 to September 1971. U.S. Geological Survey satellite telemeter at station.

The City of Seattle diverted the following average daily discharges from the river at Landsburg, 20.5 mi upstream from station, for municipal use:

Water Year	Discharge (cfs)	Water Year	Discharge (cfs)	Water Year	Discharge (cfs)	Water Year	Discharge (cfs)
2014	111	2015	123	2016	121	2017	121
2018	120	2019	129	2020	117	2021	143
2022	112	2023	136

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 10,600 ft³/s, Nov. 24, 1990, gage height, 17.13 ft, from outside high-water mark; minimum daily discharge, 30 ft³/s, July 1, 1962.

WATER-QUALITY RECORDS

PERIOD OF RECORD - Water years 1959-71, March 1978 to current year.

PERIOD OF DAILY RECORD - WATER TEMPERATURE: August 1965 to February 1967, March 1978 to current year.

INSTRUMENTATION - Temperature recorder for period of daily record, with a 15-minute logging interval since 1996.

REMARKS - Additional details are available from the Washington Water Science Center. Continuous water quality record is no longer rated, as of water year 2021. Prior ratings can be obtained via request to the Washington Water Science Center.

EXTREMES FOR PERIOD OF DAILY RECORD - WATER TEMPERATURE: Maximum, 28.5°C, June 14, 1999; minimum, 0.7°C, Jan. 29, 2000.