USGS Water-Year Summary 2020
02207120 YELLOW RIVER AT GA 124, NEAR LITHONIA, GA
LOCATION - Lat 33°46'20", long 84°03'28" referenced to North American Datum of 1983, Gwinnett County, GA, Hydrologic Unit 03070103, on GA 124 bridge, 5.0 miles south of the intersection of GA 124 and US 78.
DRAINAGE AREA - 161 mi².
- Discharge for the period Apr. 24, 2018, to Oct. 3, 2018, was revised on May 30, 2019, based on changes to the shifting of the stage-discharge rating.
PERIOD OF RECORD -
DISCHARGE: August 2001 to current year.
GAGE-HEIGHT: August 2001 to current year.
GAGE - Satellite telemetry with a water-stage recorder. Datum of gage is 719.5 feet above the North American Vertical Datum (NAVD) of 1988.
COOPERATION - Gwinnett County Department of Water Resources.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 16,500 cfs, September 22, 2009; maximum gage height, 27.47 ft, from floodmarks, September 22, 2009; minimum daily discharge, 19 cfs, August 22, 2008.
PERIOD OF RECORD - August 2001 to current year.
INSTRUMENTATION - Tipping-bucket raingage.
PERIOD OF RECORD - March 1996 to current year.
PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: August 2001 to current year.
WATER TEMPERATURE: August 2001 to current year.
TURBIDITY: August 2001 to current year.
INSTRUMENTATION - Satellite telemetry with a continuous water-quality monitor and an automatic refrigerated sampler.
EXTREMES FOR PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: Maximum recorded, 440 microsiemens, October 1, 2019; minimum recorded, 35 microsiemens, June 17, 2003.
WATER TEMPERATURE: Maximum recorded, 31.1°C, July 1, 2012; minimum recorded, 0.9°C, January 14, 2011.
TURBIDITY: Maximum recorded, 1,080 FNU, July 6, 2005; minimum recorded, <0.5 FNU, many days.