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Water-Year Summary for Site 12445000

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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 48°37'57", long 119°27'38" referenced to North American Datum of 1927, in NW 1/4 SE 1/4 sec.08, T.36 N., R.27 E., Okanogan County, WA, Hydrologic Unit 17020006, on right bank 1,000 ft upstream from Chewiliken Creek, 5.2 mi south of Tonasket, and at mile 50.8.
DRAINAGE AREA - 7,260 mi².
REVISIONS HISTORY - WSP 862: 1937. WSP 1316: 1934(M), 1938(M). WSP 1933: Drainage area.
PERIOD OF RECORD - April 1929 to current year.
GAGE - Water-stage recorder. Datum of gage is 860.78 ft above NGVD of 1929.
REMARKS - Diversions upstream from station for irrigation of about 10,700 acres in the United States and 55,000 acres in Canada. Flow affected by regulation of Okanagan and Skaha Lakes and by natural storage in other lakes. U.S. Geological Survey satellite telemeter at station.
  • Water Years 2014 to 2018: Records good except for estimated daily discharges, which are fair.
  • Water Years 2019 to 2020: Records good except for estimated discharges, which are fair.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 44,700 ft³/s, June 2, 1972, gage height, 22.54 ft; minimum discharge recorded, 126 ft³/s, Sept. 5, 1931, gage height, 3.43 ft.
PERIOD OF DAILY RECORD - WATER TEMPERATURE: April 1986 to September 1987, March 2005 to March 2018  (discontinued).
INSTRUMENTATION - Water temperature recorder with a 30-minute logging interval from March 2005 to Nov. 2008, and 15-minute logging interval from Dec. 2008 to Mar. 2018.
  • Water Years 2014 to 2016: Records excellent.
  • Water Years 2017 to 2018: Records Good.
EXTREMES FOR PERIOD OF DAILY RECORD - WATER TEMPERATURE: Maximum, 27.9°C, July 26, 2006; minimum, 0.0°C, many days during most winters.