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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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USGS Water-Year Summary 2024
02334653 CHATTAHOOCHEE R 0.76 MI US MCGINNIS FY SUWANEE GA
LOCATION - Lat 34°03'24.2", long 84°06'30" referenced to North American Datum of 1983, Forsyth County, GA, Hydrologic Unit 03130001, 1.85 miles downstream of Level Creek, 2.65 miles upstream of Suwanee Creek, and 5.5 miles northeast of Johns Creek, GA.
DRAINAGE AREA - 1,090 mi².
REVISIONS HISTORY -
Discharge for the period Jul. 16, 2010, to Apr. 11, 2018, was revised on Mar. 28, 2020, based on changes to the stage-discharge rating.
Gage datum was revised on October 21, 2024 based on an error in the determination of the gage datum.
SURFACE-WATER RECORDS
PERIOD OF RECORD -
DISCHARGE: August 2010 to current year.
GAGE HEIGHT: August 2010 to current year.
DISCHARGE: August 2010 to current year.
GAGE HEIGHT: August 2010 to current year.
GAGE - Datum of gage is 886.37 feet above North American Vertical Datum (NAVD) of 1988 (leveling by Global Positioning System equipment).
COOPERATION - Forsyth County.
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.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge recorded, 18,100 cfs, estimated, October 11, 2020; maximum gage height recorded, 19.23 ft, October 11, 2020; minimum daily mean discharge, 521 cfs, revised, February 12, 2012.
CLIMATOLOGICAL RECORDS
PERIOD OF RECORD - August 2010 to September 2017.
INSTRUMENTATION - Tipping-bucket raingage.
WATER-QUALITY RECORDS
PERIOD OF RECORD - July 2010 to current year.
PERIOD OF DAILY RECORD -
WATER TEMPERATURE: July 2010 to current year.
WATER TEMPERATURE: July 2010 to current year.
INSTRUMENTATION - Satellite telemetry with a water temperature thermistor.
REMARKS -
For period 08/23/2010-10/19/2018: Water temperature record good.
For period 08/23/2010-10/19/2018: Water temperature record good.
EXTREMES FOR PERIOD OF RECORD -
WATER TEMPERATURE: Maximum recorded, 21.1°C, August 7, 2013; minimum recorded, 4.4°C, February 12, 2014.
WATER TEMPERATURE: Maximum recorded, 21.1°C, August 7, 2013; minimum recorded, 4.4°C, February 12, 2014.
