USGS Water-Year Summary 2024
12137290 SOUTH FORK SULTAN RIVER NEAR SULTAN, WA
LOCATION - Lat 47°56'51", long 121°37'32" referenced to North American Datum of 1927, in NE 1/4 NE 1/4 sec.03, T.28 N., R.9 E., Snohomish County, WA, Hydrologic Unit 17110009, on left bank, 0.3 mi downstream from bridge, 14 mi northeast of Sultan, and 0.2 mi upstream from mouth.
DRAINAGE AREA - 11.6 mi².
REVISIONS HISTORY - WDR WA-98-1: Maximum discharge outside period of record.
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1991 to current year.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 1,450.53 ft above NGVD of 1929 (topographic map) and is 1,454.41 ft above NAVD 88 (GNSS survey by USGS on July 13, 2022).
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Nov. 24, 1990, reached a stage of 13.6 ft, from floodmark, discharge, 7,000 ft³/s, from slope-area measurement.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 8,140 ft³/s, Nov. 6, 2006, gage height, 14.20 ft; minimum daily discharge, 4.43 ft³/s, Oct. 15, 2022.
WATER-QUALITY RECORDS
PERIOD OF DAILY RECORD - WATER TEMPERATURE: October 2009 to current year.
INSTRUMENTATION - Temperature recorder with 15-min logging interval.
EXTREMES FOR PERIOD OF DAILY RECORD - WATER TEMPERATURE: Maximum, 18.6°C, July 3, 2015; minimum, -0.1°C, Dec. 21 and 22, 2022.