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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.)  
00020 Temperature, air(Mean,Max.,Min.)  
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
12116400 CEDAR RIVER AT POWERPLANT, AT CEDAR FALLS, WA
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.
REVISIONS HISTORY -

Peaks for the Water Years 2020, 2021, 2022 and 2023 have been revised. These values, shown in the following table, supersede previously published figures.

Water Year Date Discharge (ft3/s)   Gage Height (ft)
 2020  Feb. 7, 2020  3,705  38.15
 2021  Jan. 14, 2021  1,410  35.68
 2022  Nov. 16, 2021  1,203  35.38
 2023  May 20, 2023  431  33.73

SURFACE-WATER RECORDS
PERIOD OF RECORD - Oct 2001 to current year.
GAGE - Water-stage recorder and concrete weir. Datum of gage is 900.00 ft above NGVD of 1929 (City of Seattle benchmark) and is 910.83 ft above NAVD of 1988 (GNSS survey by USGS, July 19, 2022).
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.
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.
WATER-QUALITY RECORDS
PERIOD OF DAILY RECORD - WATER TEMPERATURE: October 2018 to current year.
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, 22.1°C, Aug. 17, 2023; minimum, 0.3°C, Dec. 22, 2022.