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Water-Year Summary for Site 12116400

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

Water year 2020: 2020-10-01 to 2021-09-30

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USGS Water-Year Summary 2020
LOCATION - Lat 47°25'08", long 121°46'49" referenced to North American Datum of 1927, in SE 1/4 sec.04, T.22 N., R.8 E., King County, WA, Hydrologic Unit 17110012, on right bank 100 ft upstream from Seattle Municipal Powerplant at town of Cedar Falls, and at mile 33.7.
DRAINAGE AREA - 83.9 mi². includes 78.4 mi² upstream from Cedar Lake which is non-contributing except during spillage and seepage from dam.
PERIOD OF RECORD - October 2001 to current year.
GAGE - Water-stage recorder, crest-stage gage and concrete weir. Datum of gage is 900.00 ft above NGVD of 1929 (City of Seattle benchmark).
REMARKS - Flow regulated by Chester Morse Lake (station 12115900) and Cedar Lake (station 12116060) to supply powerplant, which discharges below gage. U.S. Geological Survey satellite telemeter at station.
  • Water Years 2014, 2016, and 2017: No estimated daily discharges. Records fair.
  • Water Years 2015, 2018, 2019: Records fair.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 3,740 ft³/s, Jan. 8, 2009, gage height 38.05 ft; minimum discharge, 3.0 ft³/s, Aug. 28, 2003.
PERIOD OF RECORD - WATER TEMPERATURE: October 2018 to current year
PERIOD OF DAILY RECORD - WATER TEMPERATURE: October 2018 to current year
  • Water Year 2019: WATER TEMPERATURE records excellent.
EXTREMES FOR PERIOD OF DAILY RECORD - WATER TEMPERATURE: Maximum, 19.3°C, August 14, 2019; minimum, 1.5°C, Feb 12, 2019.