USGS Water-Year Summary 2023
03451000 SWANNANOA RIVER AT BILTMORE, NC
LOCATION - Lat 35°34'06", long 82°32'41" referenced to North American Datum of 1983, Buncombe County, NC, Hydrologic Unit 06010105, at Biltmore, Buncombe County, 100 ft downstream from Biltmore Avenue Bridge, 200 ft upstream from Southern Railway Bridge,900 ft downstream from Sweeten Creek, and 1.6 miles above mouth
DRAINAGE AREA - 130 mi².
WSP 803: 1921, 1923-26, maximum discharge. WSP 823: Drainage area. WSP 1306: 1921, 1924, 1926, maximum discharge.
Gage datum was revised on October 01, 2021, based on an error in the determination of the gage datum.
PERIOD OF RECORD - October 1920 to September 1926, May 1934 to current year. Monthly discharge only for some periods, published in WSP 1306.
GAGE - Data Collection Platform. Datum of gage is 1,976.37 ft. above NAVD of 1988. December 1, 1920, to September 30, 1926, nonrecording gage at site 100 ft upstream at same datum.
EXTREMES OUTSIDE PERIOD OF RECORD - Maximum stage observed: 26 ft; discharge: 40,000 ft³/s in April 1791, from studies by Tennessee Valley Authority. Flood of July 1916 reached a stage of 20.7 ft; discharge, 23,000 ft³/s, from flood profile by Tennessee Valley Authority. Flood of August 16, 1928 reached a stage of 18.74 ft, from floodmarks; discharge, 17,800 ft³/s.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge from rating curve extended above 9,100 ft³/s on basis of computation of peak flow over dam 3.6 mi upstream from station.
PERIOD OF RECORD - September 2019 to current year.
INSTRUMENTATION - Tipping bucket raingage