Warning: Javascript must be enabled to use all the features on this page!

Page Loading - Please Wait...

Click to hideNews Bulletins

Water-Year Summary for Site 12448998

Click to hide Water-Year Summary instructions and information
  • 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)  
00065 Gage height(Mean)  

Water year 2018: 2018-10-01 to 2019-09-30

Print this page
USGS Water-Year Summary 2018
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.
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.
  • Water Years 2014, 2016: Records good except for estimated daily discharges, which are fair.
  • Water Years 2015, 2017: Records good except for estimated daily discharges, which are poor.
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, 3,880 ft³/s, May 18, 2006, gage height, 12.04 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.