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Water-Year Summary for Site 12448500

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  • Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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Available Parameters
00060 Discharge(Mean)  
00065 Gage height(Mean)  

Water year 2023: 2023-10-01 to 2024-09-30

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USGS Water-Year Summary 2023
LOCATION - Lat 48°28'25", long 120°10'34" referenced to North American Datum of 1927, in NE 1/4 SW 1/4 sec.02, T.34 N., R.21 E., Okanogan County, WA, Hydrologic Unit 17020008, on left bank at Winthrop, 0.3 mi downstream from Chewuch River, and at mile 49.8.
DRAINAGE AREA - 1,007 mi².
PERIOD OF RECORD - January to October 1912, August 1971 to June 1972 (destroyed by flood of May 31, 1972), November 1989 to current year. Published as "near Winthrop" January to October 1912. Water temperature records April to September 2002.

Water-stage recorder. Datum of gage is 1,718.09 ft above NGVD of 1929 and datum of gage is 1722.045 above NAVD of 1988. January to August 1912, nonrecording gage at site 0.6 mi downstream at different datum. August 1971 to June 1972, water-stage recorder at same site at different datum.

REMARKS - No known regulation. Diversions for irrigation of about 1,170 acres upstream from station. U.S. Geological Survey satellite telemeter at station.
EXTREMES OUTSIDE PERIOD OF RECORD - Maximum discharge, 35,000 ft³/s May 29, 1948, determined by slope-area measurement of peak flow.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 24,400 ft³/s, May 31, 1972, gage height, 20.90 ft, from outside high-water mark; minimum discharge, 115 ft³/s, Nov. 28, 2000, gage height, 9.44 ft.