USGS Water-Year Summary 2024
02208150 ALCOVY RIVER AT NEW HOPE ROAD, NEAR GRAYSON, GA
LOCATION - Lat 33°55'01", long 83°53'17" referenced to North American Datum of 1983, Gwinnett County, GA, Hydrologic Unit 03070103, 8.0 feet downstream of bridge at New Hope Road, and 4.2 miles northeast of Grayson.
DRAINAGE AREA - 30.8 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD -
DISCHARGE: March 2001 to current year.
GAGE-HEIGHT: March 2001 to current year.
GAGE - Satellite telemetry with a water-stage recorder and continuous water-quality monitor. Datum of gage is 785.51 feet above NAVD88.
COOPERATION - Gwinnett County Department of Water Resources.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge recorded, 8,630 cfs June 17, 2003: maximum gage-height recorded, 14.93 feet, June 17, 2003; minimum daily discharge, 2.5 cfs, August 13, 2002.
CLIMATOLOGICAL RECORDS
PERIOD OF RECORD - March 2001 to current year.
INSTRUMENTATION - Tipping-bucket raingage.
WATER-QUALITY RECORDS
PERIOD OF RECORD - October 1996 to current year.
PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: March 2001 to current year.
WATER TEMPERATURE: March 2001 to current year.
TURBIDITY: March 2001 to current year.
INSTRUMENTATION - Satellite telemetry with a continuous water-quality monitor and a refrigerated automatic sampler.
EXTREMES FOR PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: Maximum recorded, 135 microsiemens, January 12, 2011; minimum recorded, 14 microsiemens, June 17, 2003.
WATER TEMPERATURE: Maximum recorded, 28.7 °C, August 9, 2007; minimum recorded, -0.1 °C, January 7, 2018.
TURBIDITY: Maximum recorded, >2,200 FNU, several days; minimum recorded, <0.5 FNU January 19-21, 2011.