USGS Water-Year Summary for Site 12138160

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00060 Discharge(Mean)
	00065 Gage height(Mean)

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Water year 2023: 2022-10-01 to 2023-09-30

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USGS Water-Year Summary 2023

12138160 SULTAN RIVER BELOW POWERPLANT, NEAR SULTAN, WA

LOCATION - Lat 47°54'27", long 121°48'51" referenced to North American Datum of 1927, in SW 1/4 SW 1/4 sec.17, T.28 N., R.8 E., Snohomish County, WA, Hydrologic Unit 17110009, on left bank, just downstream from Henry M. Jackson powerplant, 3.2 mi north of Sultan, and at mile 4.5.

DRAINAGE AREA - 94.2 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 1983 to current year.

GAGE - Water-stage recorder. Datum of gage is 267.0 ft above NGVD of 1929 (levels by Snohomish County Public Utility District). Prior to Oct. 1, 1991, at site on right bank, 100 ft downstream at same datum.

REMARKS - Flow regulated at Spada Lake (station 12137300) since April 5, 1965. Since May 1984, water is diverted from Spada Lake through a 14 ft diameter, 4 mile long tunnel and a 10 ft diameter, 4 mi long pipeline for power production and returned to the river upstream from the station, at the powerplant. Since July 1984, an undetermined flow has been returned to river at upstream diversion dam by pipeline from Lake Chaplain for instream flow requirement. Some flows diverted into Lake Chaplain from municipal use by City of Everett. U.S. Geological survey satellite telemeter at station.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 22,300 ft³/s, Nov. 24, 1990, gage height, 15.03 ft, from rating curve extended above 4,500 ft³/s; minimum daily discharge, 157 ft³/s, Aug. 24, 1985.

WATER-QUALITY RECORDS

PERIOD OF DAILY RECORD - WATER TEMPERATURE: June 1984 to current year.

INSTRUMENTATION - Temperature recorder since June 1984, with 1-hour logging interval from June 29, 2007 to Jan. 15, 2009, and 15-minute logging interval from 1993 to June 29, 2007 and Jan. 15, 2009 to present.

REMARKS - U.S. Geological survey satellite telemeter at station.

EXTREMES FOR PERIOD OF DAILY RECORD - WATER TEMPERATURE: Maximum, 17.5°C (rounded), Sept. 5-7, 1986; minimum, 1.0°C (rounded), Feb. 2-5, 1989.