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USGS Water-Year Summary 2024
12449500 METHOW RIVER AT TWISP, WA
LOCATION - Lat 48°21'55", long 120°06'54" referenced to North American Datum of 1927, in NE 1/4 NW 1/4 sec.17, T.33 N., R.22 E., Okanogan County, WA, Hydrologic Unit 17020008, on left bank, 0.25 mi downstream from Twisp River, 0.3 mi east of center of Twisp, and at mile 40.
DRAINAGE AREA - 1,301 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - June 1919 to September 1962, April 1991 to current year. Monthly discharge only for some periods, published in WSP 1316. Miscellaneous measurements in 1967, 1970, 1976, 1978-90. For 1976, 1978-80 published as "at site 2.7 mi downstream", in error.
Water temperature records April to September 2002.
GAGE - Water-stage recorder. Elevation of gage is 1,580 ft above NGVD of 1929, from topographic map. Prior to Oct. 3, 1919, several staff gages in the immediate vicinity at different datum. Oct. 3, 1919, to Sept. 30, 1929, and Oct. 31 to Nov. 6, 1933, chain gage on road bridge 40 ft upstream at same datum as staff gages. Nov. 7 to Dec. 18, 1933, staff gage at present site at different datum.
REMARKS - No known regulation. Numerous diversions for irrigation upstream from station.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 40,800 ft³/s, May 29, 1948, gage height, 12.94 ft, in gage well, from rating curve extended above 18,000 ft³/s, on basis of slope-area measurement of peak flow; minimum observed, 134 ft³/s, Sept. 4, 5, 1926, Sept. 9, 10, 1929, but may have been less during period of ice effect Jan. 6 to Mar. 4, 1937.
