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Water-Year Summary for Site 12155500

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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(Mean)  

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

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USGS Water-Year Summary 2020
LOCATION - Lat 47°54'45.84", long 122°06'23.25" referenced to North American Datum of 1983, in NE 1/4 SE 1/4 sec.13, T.28 N., R.5 E., Snohomish County, WA, Hydrologic Unit 17110011, at right bank pier of bridge on State Highway 9 in Snohomish.
DRAINAGE AREA - 1,714 mi².
REVISIONS HISTORY - WDR WA-00-1: 1999 (m).
PERIOD OF RECORD - February 1941 to September 1966 (high-water discharges only). High-water elevations prior to 1932 and high-water profiles on flood peaks since that time are available at the Seattle office of Corps of Engineers. October 1998 to current year (stage only).
GAGE - Water-stage recorder. Datum of gage is 9.86 ft below NGVD of 1929. Prior to February 3, 1960, at site half a mile upstream at datum 0.14 ft lower (corrected).
REMARKS - Large diurnal fluctuation due to tidal affect. Some regulation by power plants above station. Minor diversions for irrigation returned to river above gage. A slight amount of storage in Lake Chaplain by the City of Everett.
EXTREMES OUTSIDE PERIOD OF RECORD - Maximum stage known, 35 ft at former site in 1906, from flood profile furnished by Corps of Engineers.
EXTREMES FOR PERIOD OF RECORD - Maximum gage height, 30.12 ft, Feb. 10, 1951, site and datum then in use. Maximum gage height, 30.90 ft, February 18, 2015, present datum.