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  • UPDATE, 11/9: As of November 8, the USGS has successfully restored all of the operational gages that stopped transmitting due to an issue with the satellite telemetry system that records and transmits data. The USGS will now focus on restoring other equipment that experienced the telemetry issues, including about 85 rapid deployment gages that are used periodically for emergency response. Read more
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Water-Year Summary for Site 12453700

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

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USGS Water-Year Summary 2018
LOCATION - Lat 47°31'28", long 120°18'04" referenced to North American Datum of 1927, in SW 1/4 NW 1/4 sec.02, T.23 N., R.20 E., Chelan County, WA, Hydrologic Unit 17020010, on right bank 0.5 mi downstream from Rocky Reach Dam, 1.5 mi downstream from Swakane Creek, 7.4 mi north of Wenatchee, and at mile 473.4. Auxiliary GAGE: Lat 47°31'30", long 120°18'00", in SE 1/4 sec. 10, T. 23 N., R. 20 E., on right bank 2.2 mi downstream from Rocky Reach Dam, 4.8 mi north of Wenatchee(Both gages are currently abandoned).
DRAINAGE AREA - 87,800 mi².
PERIOD OF RECORD - October 1960 to current year.
GAGE - Daily discharge determined from flow through turbines plus spillway flow when present. Datum of gage is NGVD of 1929. Oct. 1, 1960, to July 22, 1988, water-stage recorder with auxiliary water-stage recorder 1.9 mi downstream from base gage at same datum.
COOPERATION - Discharge records provided by Public Utility District No. 1 of Chelan County at Rocky Reach 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 discharge, about 535,000 ft³/s, June 10, 1961, elevation, about 635.50 ft; minimum daily discharge, 25,100 ft³/s, Nov. 11, 1973.