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Water-Year Summary for Site 12143800

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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
00065 Gage height(Obs.)  

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

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USGS Water-Year Summary 2020
LOCATION - Lat 47°25'39", long 121°46'29" referenced to North American Datum of 1927, in SW 1/4 SW 1/4 sec.34, T.23 N., R.8 E., King County, WA, Hydrologic Unit 17110010, on southeast shore, and 0.6 mi northeast of town of Cedar Falls.
DRAINAGE AREA - 1.86 mi².
PERIOD OF RECORD - November to December 1945 (fragmentary), January 1953 to current year. Extremes prior to October 1960 published in WSP 1932 and daily gage heights are available in files of the U.S. Geological Survey.
GAGE - Nonrecording gage. Datum of gage is 7.25 ft above NGVD of 1929 (levels by City of Seattle).
COOPERATION - Gage readings furnished by City of Seattle Water Department.
REMARKS - No diversions. Inflow is mostly seepage from Chester Morse Lake. Most outflow from lake is seepage; however, when the lake level exceeds 906 ft gage height, surface-water discharge flows through Rattlesnake Ditch toward Boxley Creek.
EXTREMES FOR PERIOD OF RECORD - Maximum gage height observed, 911.80 ft, Nov. 25, 26, 1959; minimum observed, 852.80 ft, Jan. 9, 1953, but may have been less during Dec. 13, 1965, to Jan. 3, 1966, and Nov. 10 to Dec. 23, 1970, when water was below gage.