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  • UPDATE, 11/9: As of November 8, the USGS has successfully restored all of the operational gages that stopped transmitting due to an issue with the satellite telemetry system that records and transmits data. The USGS will now focus on restoring other equipment that experienced the telemetry issues, including about 85 rapid deployment gages that are used periodically for emergency response. Read more
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Water-Year Summary for Site 12108500

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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
00060 Discharge(Mean)  
00065 Gage height(Mean)  

Water year 2018: 2018-10-01 to 2019-09-30

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USGS Water-Year Summary 2018
LOCATION - Lat 47°16'33", long 122°03'30" referenced to North American Datum of 1927, in NW 1/4 SW 1/4 sec.28, T.21 N., R.6 E., King County, WA, Hydrologic Unit 17110013, on right bank 0.1 mi downstream from West Whitney Hill bridge, 0.8 mi upstream from mouth, and 3.5 mi southwest of Black Diamond.
DRAINAGE AREA - 27.4 mi².
REVISIONS HISTORY - WSP 1396: 1946(M), 1949(P). WSP 1932: Drainage area. WDR WA-74-1: 1973(M). WDR WA-76-1: 1975. WDR WA-00-1: 1999 (m).
PERIOD OF RECORD - July 1944 to November 1950, water years 1951-52 (annual maximum), September 1952 to current year.
GAGE - Water-stage recorder. Elevation of gage is 310 ft above NGVD of 1929, from topographic map. November 1950 to September 1952 stilling well with nonrecording gage only.
REMARKS - Many small diversions upstream from station for irrigation and domestic use. No regulation.
  • Water Year 2014: Records fair except discharges above 300 ft³/s, which are poor.
  • Water Year 2015, 2016, 2017: Records poor.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 2,640 ft³/s, Feb. 8, 1996, gage height, 3.95 ft, from rating curve extended above 1,260 ft³/s; minimum discharge, 7.54 ft³/s, Sept. 15, 2016.