USGS Water-Year Summary 2019
02335700 BIG CREEK NEAR ALPHARETTA, GA
LOCATION - Lat 34°03'02", long 84°16'10" referenced to North American Datum of 1983, Fulton County, GA, Hydrologic Unit 03130001, on right bank at downstream side of bridge on Kimball Bridge Road, 2.6 miles southeast of Alpharetta, and 9.4 miles upstream from mouth.
DRAINAGE AREA - 72 mi².
PERIOD OF RECORD -
DISCHARGE : May 1960 to current year.
GAGE HEIGHT : October 1998 to current year.
GAGE - Satellite telemetry with a water-stage recorder. Datum of gage is 960.80 feet above National Geodetic Vertical Datum (NGVD) of 1929 (levels by U.S. Soil Conservation Service).
COOPERATION - Southern Company.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge recorded, 6,100 cfs, February 3, 1982; maximum gage-height recorded 13.05 feet, February 3, 1982; minimum daily discharge, 1.7 cfs, July 22, 1986.
PERIOD OF RECORD - April 2002 to July 2010, September 2013 to current year.
INSTRUMENTATION - Tipping-bucket raingage.
PERIOD OF RECORD - April 2016 to current year.
PERIOD OF DAILY RECORD - WATER TEMPERATURE: April 2016 to current year.
EXTREMES FOR PERIOD OF DAILY RECORD -
WATER TEMPERATURE: Maximum recorded, 27.1°C, July 21, 26, 2016; minimum recorded, 0.6°C, January 5, 2018.