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USGS Water-Year Summary 2024
02223000 OCONEE RIVER AT MILLEDGEVILLE, GA
LOCATION - Lat 33°05'24.6", long 83°12'53.2" referenced to North American Datum of 1983, Baldwin County, GA, Hydrologic Unit 03070102, 0.5 miles upstream from bridge on GA HWY 24, 3.8 miles downstream from Sinclair Dam, and at river mile 139.1.
DRAINAGE AREA - 2,950 mi².
REVISIONS HISTORY - WSP 1142: 1928(M). WSP 1504: 1903-4, 1908, 1912-13, 1914(M), 1915-17. WSP 1554: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD -
DISCHARGE: August 1903 to current year.
GAGE HEIGHT: October 1998 to current year.
DISCHARGE: August 1903 to current year.
GAGE HEIGHT: October 1998 to current year.
GAGE - Satellite telemetry with a water-stage recorder. Datum of gage is 230.3 feet above North American Vertical Datum (NAVD) of 1988. Prior to May 23, 1906, from January 1 to October 5, 1909, and from January 1, 1932, to September 30, 1939, a non-recording gage was installed at a site 0.5 miles downstream, and from October 1, 1939, to March 8, 1966, a water-stage recorder was located at a site 0.3 miles downstream, all at present datum. From May 23, 1906, to December 31, 1908, and from October 6, 1909, to December 31, 1931, a non-recording gage was located at Fraleys Ferry, 6.8 miles upstream at different datum.
COOPERATION - Georgia Power Company.
REMARKS - Gage-height records are generally good. Discharge records are generally fair except for estimated discharges, which are poor. Additional details on the accuracy of the records can be obtained by contacting the USGS South Atlantic Water Science Center at gs-w-ga_nwisweb_data_inquiries@usgs.gov.
Flow regulated by Sinclair Reservoir since November 1952.
EXTREMES OUTSIDE PERIOD OF RECORD - Maximum stage known, 46.7 feet in 1886 at site 0.5 miles downstream at present datum, from information furnished by Georgia Department of Transportation.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge recorded, 122,000 cfs, Febuary 25, 1961; maximum gage height recorded, 42.90 feet, Febuary 25, 1961; minimum daily discharge, 90 cfs, August 31, 1925.
EXTREMES FOR PERIOD PRIOR TO REGULATION - Maximum discharge recorded, 95,000 cfs, from rating curve extended above 77,000 cfs, August 16, 1928; maximum gage-height recorded, 38.7 feet, from floodmarks, August 16, 1928; minimum daily discharge, 90 cfs, August 31, September 1,7,9-13,23-25, 1925.
CLIMATOLOGICAL RECORDS
PERIOD OF RECORD - November 2000 to September 2009. October 2010 to October 2017.
INSTRUMENTATION - Tipping-bucket raingage.
