USGS Water-Year Summary for Site 02218300

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	Available Parameters
	00045 Precipitation(Sum)
	00045 Precipitation(Sum) [Operational]
	00060 Discharge(Mean)
	00065 Gage height(Mean)

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Water year 2023: 2022-10-01 to 2023-09-30

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USGS Water-Year Summary 2023

02218300 OCONEE RIVER NEAR PENFIELD, GA

LOCATION - Lat 33°43'14.5", long 83°17'44.2" referenced to North American Datum of 1983, Greene County, GA, Hydrologic Unit 03070101, on downstream side of bridge on GA 15, 7.0 miles upstream from Greenbrier Creek, 8.0 miles northwest of Penfield, GA, and 10.0 mi southeast of Watkinsville, GA.

DRAINAGE AREA - 940 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD -
DISCHARGE: Water years 1970-77 (annual maximum). August 1977 to current year.
GAGE HEIGHT: Water years 1970-77 (annual maximum). October 1998 to current year.

GAGE - Satellite telemetry with a water-stage recorder. Datum of gage is 433.0 feet above North American Vertical Datum (NAVD) of 1988. From November 4, 1969 to July 21, 1977, a crest-stage partial-record station, and from July 22, 1977 to August 1, 1990, a water-stage recorder was located at site 300 feet upstream at same datum.

COOPERATION - Georgia Power Corporation.

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.

Some regulation at low streamflow occurs from operation of Barnett Shoals Dam.

EXTREMES OUTSIDE PERIOD OF RECORD - Flood of December 19, 1919, reached a stage of 26.9 feet, information supplied by Georgia Department of Transportation, discharge, 37,000 cfs, from rating curve extended above 22,000 cfs on basis of slope-conveyance study. The flood of April 6, 1936 reached a stage of 26.7 feet and discharge of 36,000 cfs (revised) from rating curve extended above 22,000 cfs on basis of slope-conveyance study.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge recorded, 31,700 cfs, from rating curve extended above 22,000 cfs on basis of slope-conveyance study, October 1, 1989; maximum gage height recorded, 25.92 feet, October 1, 1989; minimum daily discharge, 33 cfs, August 26, 1986.

CLIMATOLOGICAL RECORDS

PERIOD OF RECORD - December 2000 to October 2017.

INSTRUMENTATION - Tipping-bucket raingage.