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Water-Year Summary for Site 12116500

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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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Available Parameters
00010 Temperature, water(Max.,Min.,Mean)  
00060 Discharge(Mean)  
00065 Gage height(Mean)  

Water year 2024: 2024-10-01 to 2025-09-30
 
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USGS Water-Year Summary 2024
12116500 CEDAR RIVER AT CEDAR FALLS, WA
LOCATION - Lat 47°25'02", long 121°47'27" referenced to North American Datum of 1927, in SW 1/4 SE 1/4 sec.04, T.22 N., R.8 E., King County, WA, Hydrologic Unit 17110012, Snoqualmie National Forest, on right bank 0.5 mi downstream from Seattle municipal powerplant at town of Cedar Falls, 4.0 mi downstream from Chester Morse Lake, and at mile 33.2.
DRAINAGE AREA - 84.2 mi².
REVISIONS HISTORY - WSP 722: 1930. WSP 1286: 1934(M), drainage area. WDR-WA-96-1: 1991(M).
SURFACE-WATER RECORDS
PERIOD OF RECORD - April 1914 to current year.
GAGE - Water-stage recorder. Datum of gage is 902.1 ft above NGVD of 1929 (from topographic map) and is 905.86 ft above NAVD of 1988 (GNSS survey by USGS, July 20, 2022).
REMARKS - All diversions are returned to river upstream from station. Flow regulated by Chester Morse Lake (station 12115900) and Cedar Lake (station 12116060). U.S. Geological Survey satellite telemeter at station.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 9,120 ft³/s, Nov. 24, 1990 from rating extension above 6640 ft³/s, gage height, 14.00 ft, from flood mark; no flow part or all of each day Nov. 25, 1917, Aug. 18, 1923, Sep. 30 to Oct. 5, 1987.
WATER-QUALITY RECORDS
PERIOD OF DAILY RECORD - WATER TEMPERATURE: March 1999 to current year.
INSTRUMENTATION - Temperature recorder with 15-minute logging interval, since March 1999.
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 - WATER TEMPERATURE: Maximum, 24.8°C, Aug. 22, 1999; minimum, 0.2°C, Dec. 23, 2022.