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Water-Year Summary for Site 12138160

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  • Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
  • For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
  • For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
  • For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
  • Not all sites have reports available for every water year.
Available Parameters
00010 Temperature, water(Max.,Min.,Mean)  
00060 Discharge(Mean)  
00065 Gage height(Mean)  

Water year 2020: 2019-10-01 to 2020-09-30

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USGS Water-Year Summary 2020
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.
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.
  • Water Years 2014 to 2017: No estimated daily discharges. Records good.
  • Water Years 2018: No estimated discharges. Records good.
  • Water Year 2019: Records good except for estimated discharges, which are poor.
  • Water Year 2020: Records fair except for estimated discharges, which are poor.
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.
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.
  • Water Year 2014: Water temperature records are good.
  • Water Year 2015: Water temperature records are excellent except Dec. 5 to Jan. 8 and May 20 to Sept. 3, which are good.
  • Water Year 2016: Water temperature records are good except for Nov. 26 to Dec. 19 and Mar. 22 to Apr. 2 which are poor. No record from Dec. 19 to Jan. 5, Jan. 7 to 20, Jan. 31 to Feb. 1, and Feb. 15 to Mar. 10.
  • Water Year 2017: Water temperature records are fair except for Dec. 13 to Mar. 6, which are poor.
  • Water Year 2018: Water temperature records are fair. No record July 3 to 4, Aug. 16, 19 to 20 and Sept. 8 to 11.
  • Water Year 2019: Water temperature records are fair. No record Oct. 21 to 26, July 19 to 23 and Aug. 5 to 7.
  • Water Year 2020: Water temperature records are fair. No record Feb. 21-24 and June 12-18.
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.