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USGS Water-Year Summary 2024
12155500 SNOHOMISH RIVER AT SNOHOMISH, WA
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).
SURFACE-WATER RECORDS
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 October 2022 (stage only). October 2022 to current year. (Stage and Discharge)
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 discharge, 58,500 ft³/s, Nov. 5, 2022, gage height, 25.25 ft. 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.
WATER-QUALITY RECORDS
PERIOD OF RECORD - TURBIDITY: October 2022 to current year.
INSTRUMENTATION - An Analite NEP5000 turbidity sensor interfaced with a Data Collection Platform/Electronic Datalogger, with 15-min recording interval. Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government.
REMARKS - U.S. Geological Survey satellite telemeter at station.
EXTREMES FOR PERIOD OF RECORD - TURBIDITY: Maximum, 389 FNU, Nov. 5, 2022; minimum, 0.0 FNU, Aug. 29, 2023.
