USGS Water-Year Summary for Site 02335450

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00060 Discharge(Mean)
	00065 Gage height(Mean,Max.,Min.)

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

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USGS Water-Year Summary 2023

02335450 CHATTAHOOCHEE RIVER ABOVE ROSWELL, GA

LOCATION - Lat 33°59'08.9", long 84°18'56.5" referenced to North American Datum of 1983, Fulton County, GA, Hydrologic Unit 03130001, on right bank at Eves Road, 3.3 miles upstream from Big Creek, and 2.2 miles upstream from GA 400, 3.6 miles southeast of Roswell, and at mile 320.6.

DRAINAGE AREA - 1,220 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD -
DISCHARGE: October 1941 to May 1960 (published as 02335500, Chattahoochee River "near Roswell"), July 1976 to current year.
GAGE HEIGHT: October 1998 to current year.

GAGE - Satellite telemetry with a water-stage recorder. Datum of gage is 858.18 feet above North American Vertical Datum (NAVD) of 1988 (leveling by Global Positioning System equipment). Prior to July 7, 1976, at site 1.8 miles downstream at datum 8.51 feet lower.

COOPERATION - Georgia Power Corporation.

REMARKS - Gage-height records are generally good. Discharge records are generally good 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.

Flow regulated by Lake Sidney Lanier since January 1956. Statistics prior to regulation are available upon request.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge recorded, 56,000 cfs, January 8, 1946; maximum gage height recorded, 23.40 feet, January 8, 1946; minimum daily discharge, 315 cfs, August 11, 1957.

EXTREMES FOR PERIOD PRIOR TO REGULATION - Maximum discharge recorded, 56,000 cfs, January 8, 1946, from rating curve extended above 30,000 cfs on basis of peak flows over Morgan Falls Dam; maximum gage-height recorded, 23.40 feet, January 8, 1946.

WATER-QUALITY RECORDS

PERIOD OF DAILY RECORD -
WATER TEMPERATURE: January 2004 to December 2006 and September 2011 to current year.

INSTRUMENTATION - Satellite telemetry with a continuous water temperature thermistor.

REMARKS -
For period 10/01/2013-09/30/2014: Water temperature record good.
For period 10/01/2014-09/30/2015: Water temperature record good.
For period 10/01/2015-09/30/2016: Water temperature record good.
For period 10/01/2016-01/18/2017: Water temperature record good.

EXTREMES FOR PERIOD OF DAILY RECORD -
WATER TEMPERATURE: Maximum recorded, 24.2°C, July 9, 2017; minimum recorded, 3.3°C, February 19, 2015.