USGS Water-Year Summary for Site 12442500

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

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USGS Water-Year Summary 2024

12442500 SIMILKAMEEN RIVER NEAR NIGHTHAWK, WA

LOCATION - Lat 48°59'05", long 119°37'02" referenced to North American Datum of 1927, in NW 1/4 sec.07, T.40 N., R.26 E., Okanogan County, WA, Hydrologic Unit 17020007, on left bank 1,000 ft upstream from Oroville-Tonasket Irrigation District canal intake, 1.6 mi northeast of Nighthawk, 3.8 mi downstream from Palmer Creek, and at mile 15.8.

DRAINAGE AREA - 3,550 mi².

REVISIONS HISTORY - WSP 1183: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - May 1911 to current year (prior to September 1928, mean monthly discharge included Oroville-Tonasket Irrigation District canal). Published as "near Oroville" 1911-28.

GAGE -

Water-stage recorder. Datum of gage is 1,137.70 ft above NGVD 29, and 1,142.198 ft above NAVD of 1988. Prior to Sept. 11, 1928, staff gages at sites 7 mi downstream (below Oroville-Tonasket Irrigation District canal) at various datums.

COOPERATION - This station is maintained by the United States under agreement with Canada.

REMARKS - Flow at high stages regulated by natural diversion into and release from Palmer Lake of about 6,000 acre-ft. Several small diversions upstream from station for irrigation of about 2,900 acres in the United States in 1946 and approximately 10,500 acres in Canada in 1957. U. S. Geological Survey satellite telemeter at station.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 45,800 ft³/s, June 1, 1972; maximum gage height, 18.78 ft, May 31, 1972; minimum discharge, 65 ft³/s, Jan. 3, 1974; minimum gage height, 1.55 ft, Jan. 31, 1988, result of freezeup.

WATER-QUALITY RECORDS

PERIOD OF RECORD - April 1986 to September 1987, March 2014 to current year.

INSTRUMENTATION - Water temperature recorder with a 15-minute logging interval.

REMARKS -

EXTREMES FOR PERIOD OF DAILY RECORD - Maximum, 25.5°C, August 15, 2023; Minimum, -0.3°C many days in winter.