USGS Water-Year Summary for Site 12439500

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00060 Discharge(Mean)
	00065 Gage height(Mean) [AUXILIARY GAGE]
	00065 Gage height(Mean) [BASE GAGE]

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Water year 2024: 2024-10-01 to 2025-09-30

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USGS Water-Year Summary 2024

12439500 OKANOGAN RIVER AT OROVILLE, WA

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.

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 1942 to current year.

GAGE - Water-stage recorder. Datum of gage is 900.00 ft above NGVD of 1929 and 904.016 ft above NAVD of 1988. 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.

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.

WATER-QUALITY RECORDS

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.

REMARKS -

EXTREMES FOR PERIOD OF DAILY RECORD - WATER TEMPERATURE: Maximum, 30.1°C, July 23, 2006; minimum, 0.0°C, occurs during most winters.