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Water-Year Summary for Site 12118400

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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
00045 Precipitation(Max.,Sum)  
00060 Discharge(Mean)  

Water year 2020: 2019-10-01 to 2020-09-30

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USGS Water-Year Summary 2020
LOCATION - Lat 47°21'45", long 122°00'35" referenced to North American Datum of 1927, in NE 1/4 SW 1/4 sec.26, T.22 N., R.6 E., King County, WA, Hydrologic Unit 17110012, on right bank in front of Parshall Flume, upstream of State Hwy 516, 1.5 mi northwest of Ravensdale.
DRAINAGE AREA - 11.2 mi².
PERIOD OF RECORD - June 1956 to September 1962. May 2001 to current year. Published as "at State Highway 5A" 1956-62.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 559.24 ft above NAVD of 1988 (Levels from City of Kent). Prior to May, 2001, recording gage at same site at different datum.
REMARKS - Diversions by City of Kent upstream of gage for municipal use may affect flow. U.S. Geological Survey satellite telemeter at station.
  • Water Years 2014, 2015: Records fair except estimated daily discharges and flows above 36 ft³/s, which are poor.
  • Water Year 2016: No estimated daily discharges. Records fair except flows above 36 ft³/s, which are poor.
  • Water Years 2017 to 2020: No estimated discharges. Records good.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 336 ft³/s, Feb. 7, 2020, gage height 3.71 ft; minimum, 0.86 ft³/s, Nov. 2, 2002.
PERIOD OF RECORD - PRECIPITATION: October 2003 to current year.
INSTRUMENTATION - Tipping bucket rain gage. Electronic data logger with 15-min. recording interval.
EXTREMES FOR PERIOD OF RECORD - Maximum daily precipitation, 4.13 in., Oct. 20, 2003.
  • Water Years 2014, 2015, 2018, 2020: Records good.
  • Water Year 2016: Records fair except for Aug. 26-Sept. 30, which are good.
  • Water Year 2017: Records good. Missing data from July 18-Sept 28.
  • Water Year 2019: Records good. Missing data from Aug. 9-10.