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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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USGS Water-Year Summary 2024
12448998 TWISP RIVER NEAR TWISP, WA
LOCATION - Lat 48°22'12", long 120°08'51" referenced to North American Datum of 1927, in SE 1/4 SE 1/4 sec.12, T.33 N., R.21 E., Okanogan County, WA, Hydrologic Unit 17020008, on left bank, 20 ft downstream from county road bridge, 0.7 mi west of the Twisp city limits, and at mile 1.6.
DRAINAGE AREA - 245 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - May 1975 to September 1979, October 1989 to current year.
GAGE - Water-stage recorder and crest-stage gage. Elevation of gage is 1,640 ft above NGVD of 1929, from topographic map, May 1975 to September 1979, water-stage recorder at same site. Crest-stage gage since September 1992.
REMARKS - No known regulation. Several diversions upstream from station for irrigation. U.S. Geological Survey satellite telemeter at station. Water temperature records October 2001 to September 2002.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of May 29, 1948, had a discharge of 9,440 ft³/s, by slope-area measurement made about 1,000 ft upstream from mouth.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 4,040 ft³/s, May 5, 2023, gage height, 12.32 ft; maximum gage height, 12.42 ft, June 17, 1999, from crest-stage gage; minimum discharge, 13 ft³/s, Aug. 25-30, Sept. 2, 8, 2005, but may have been lower during periods of missing record Sept. 19, 20 and 22-24, 2001.
