USGS Water-Year Summary 2020
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.
- 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).
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.