USGS Water-Year Summary 2020
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.
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).
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
EXTREMES FOR PERIOD OF DAILY RECORD - WATER TEMPERATURE: Maximum, 19.3°C, August 14, 2019; minimum, 1.5°C, Feb 12, 2019.