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Water-Year Summary for Site 12449500

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  • Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
  • For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
  • For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
  • For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
  • Not all sites have reports available for every water year.
Available Parameters
00060 Discharge(Mean)  

Water year 2020: 2019-10-01 to 2020-09-30

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USGS Water-Year Summary 2020
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.
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.
  • Water Years 2014, 2016 to 2018: Records good except for estimated daily discharges which are fair.
  • Water Year 2015: Records good except for period September 25-30 and estimated daily discharges which are fair.
  • Water Years 2019, 2020: No estimated discharges, records good.
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.