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Water-Year Summary for Site 12450700

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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.
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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 47°56'48", long 119°51'56" referenced to North American Datum of 1927, in SW 1/4 SE 1/4 sec.06, T.28 N., R.24 E., Chelan County, WA, Hydrologic Unit 17020005, at powerhouse of Wells Dam, 0.7 mi northeast of Azwell, and at mile 515.9. Auxiliary GAGE: Base Lat 47 52'11", long 119 54'55", in NW 1/4 NW 1/4 sec. 2, T. 27 N., R. 23 E., Chelan County, Hydrologic Unit 17020005, on right bank 6.7 mi downstream from Wells Dam and at mile 509.1.
DRAINAGE AREA - 86,100 mi².
PERIOD OF RECORD - October 1967 to current year. October 1953 to September 1967 (monthly discharge only) in the files of the U.S. Geological Survey.
GAGE - Daily discharge determined from flow through turbines plus spillway flow when present. Datum of gage is NGVD of 1929 (levels by Bechtel Corporation). Prior to Oct. 1, 1970, at site 0.8 mi downstream at same datum. Oct. 1, 1970, to July 20, 1988, water-stage recorder at present site and datum with auxiliary water-stage recorder 6.8 mi downstream from base gage at same datum.
COOPERATION - Discharge records provided by Public Utility District No. 1 of Douglas County at Wells Dam through the Corps of Engineers, North Pacific Division, Reservoir Control Center. The U.S. Geological Survey makes discharge measurements at this site during the year.
REMARKS - Flow regulated by numerous reservoirs. Feeder Canal diversion (station 12435500) for Columbia Basin project is used to irrigate approximately 600,000 acres in the United States. An additional 66,500 acres in Canada are irrigated by other diversions.
EXTREMES FOR PERIOD OF RECORD - Maximum daily discharge, 402,000 ft³/s, June 15, 1972; maximum elevation, 731.92 ft, June 16, 1972; minimum discharge, 17,900 ft³/s, Oct. 5, 1970 (from powerplant records); 12,300 ft³/s measured, February 24, 2010; minimum elevation, 703.55 ft, Sept. 28, 1980.