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Water-Year Summary for Site 12439500

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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) [AUXILIARY GAGE]  
00065 Gage height(Mean) [BASE GAGE]  

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

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USGS Water-Year Summary 2020
LOCATION - Lat 48°55'51", long 119°25'09" referenced to North American Datum of 1927, in SE 1/4 SW 1/4 sec.27, T.40 N., R.27 E., Okanogan County, WA, Hydrologic Unit 17020006, base gage on left bank in Oroville, 20 ft downstream from Burlington Northern trestle, 0.5 mi downstream from Tonasket Creek, 1.7 mi downstream from Osoyoos Lake, 3.2 mi upstream from Similkameen River, and at mile 77.3. The auxillary gage is located 0.5 mi downstream at mile 76.8.
DRAINAGE AREA - 3,195 mi².
REVISIONS HISTORY - WDR WA-75-1: Drainage area.
PERIOD OF RECORD - October 1942 to current year.
GAGE - Water-stage recorder. Datum of gage is NGVD of 1929. Prior to Oct. 26, 1944, nonrecording gage at Zosel Mill dam 200 ft upstream, Oct. 26, 1944, to Mar. 6, 1948, water-stage recorder on railroad trestle 20 ft upstream, both at same datum. Auxiliary water-stage recorder 0.5 mi downstream used during high-water periods; May 15, 1946, to Apr. 9, 1948, nonrecording gage at same site, both at datum 900.00 ft above NGVD of 1929. To convert to 1947 joint adjustment of U.S. Coast and Geodetic Survey and Geodetic Survey of Canada, subtract 0.26 ft.
COOPERATION - This station is maintained by the United States under agreement with Canada.
REMARKS - Diversions made to irrigate approximately 44,000 acres in Canada and minor diversions in the United States upstream from station. Natural regulation in several large lakes and artificial regulation in Okanagan Lake 46.7 mi upstream for flood control and irrigation; also regulated by Zosel dam at Oroville, 500 ft upstream from gage. U.S. Geological Survey satellite telemeter at station.
  • Water Year 2014: Records good except for backwater periods May 2, 2014 to July 1, 2014, which are fair.
  • Water Year 2015: Records good except for backwater periods May 17, 2015 to June 3, 2015, which are fair.
  • Water Year 2016: Records good except for backwater periods April 9, 2016 to May 24, 2016, which are fair.
  • Water Year 2017: Records good except for backwater periods May 5, 2017 to June 26, 2017, which are fair.
  • Water Year 2018: Records good except for backwater periods April 27, 2018 to June 13, 2018, which are fair.
  • Water Year 2019: Records good except for backwater periods May 10, 2019 to June 2, 2019 and estimated discharges, which are fair.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 4,340 ft³/s May 13, 2018; maximum elevation, 916.89 ft June 2, 1972, at datum then in use, backwater from Similkameen River; minimum daily discharge, -2,270 ft³/s reverse flow May 29, 1948; minimum elevation, 903.98 ft Mar. 1, 1948, at datum then in use.
PERIOD OF DAILY RECORD - WATER TEMPERATURE: April 1986 to September 1987 (at base gage), March 2005 to July 2007 (at auxiliary gage), July 2007 to current year (at base gage).
INSTRUMENTATION - Water temperature recorder with 15-minute logging interval since March, 2005.
  • Water Year 2014: Temperature records good.
  • Water Years 2015 to 2019: Temperature records excellent.
EXTREMES FOR PERIOD OF DAILY RECORD - WATER TEMPERATURE: Maximum, 30.1°C, July 23, 2006; minimum, 0.0°C, occurs during most winters.