USGS Water-Year Summary 2023
12155300 PILCHUCK RIVER NEAR SNOHOMISH, WA
LOCATION - Lat 47°56'06", long 122°04'19" referenced to North American Datum of 1927, in NW 1/4 NW 1/4 sec.08, T.28 N., R.6 E., Snohomish County, WA, Hydrologic Unit 17110011, on right bank, 1.8 mi northeast of Snohomish, and at mile 3.6.
DRAINAGE AREA - 127 mi².
REVISIONS HISTORY - WDR-WA-2009: 1995-98(P),2000-08(P).
SURFACE-WATER RECORDS
PERIOD OF RECORD - May 1992 to current year.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 30.00 ft above NGVD of 1929 (topographic map) and is 33.23 ft above NAVD of 1988 (USGS GNSS survey Sept. 21, 2021).
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Nov. 24, 1990, reached a stage of 18.75 ft, from high-water mark at former bridge, discharge, 7,100 ft³/s (from slope-area measurement of peak flow).
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 13,900 ft³/s, Jan. 8, 2009, gage height, 20.39 ft; minimum daily discharge, 35.6 ft³/s, Aug. 28, 2015.