USGS Water-Year Summary for Site 02336000

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00060 Discharge(Mean)
	00065 Gage height(Mean)
	00095 Specific cond at 25C(Min.,Max.,Mean)
	63680 Turbidity, Form Neph(Min.,Mean,Max.)

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

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USGS Water-Year Summary 2023

02336000 CHATTAHOOCHEE RIVER AT ATLANTA, GA

LOCATION - Lat 33°51'33", long 84°27'16" referenced to North American Datum of 1983, Fulton County, GA, Hydrologic Unit 03130001, on left bank 20.0 feet upstream from Paces Ferry Bridge, 1.0 mile downstream from Rottenwood Creek, 2.5 miles upstream from Peachtree Creek, and at mile 303.0.

DRAINAGE AREA - 1,450 mi².

REVISIONS HISTORY - WSP 972: 1932

SURFACE-WATER RECORDS

PERIOD OF RECORD -
DISCHARGE: August 1928 to December 1931, October 1936 to current year. Prior to October 1951, published as "near Vinings".
GAGE HEIGHT: October 1998 to current year.

GAGE - Satellite telemetry with a water-stage recorder. Datum of gage is 750.43 feet above North American Vertical Datum (NAVD) of 1988. From August 3, 1928, to December 31, 1931, gage was a water-stage recorder, and November 15, 1936 to March 8, 1937, a non-recording gage was located at the same site and datum. Since June 1967, auxiliary water-stage recorder located at bridge on US 41, 0.8 miles upstream.

COOPERATION - U.S. Army Corps of Engineers, Mobile District; Georgia Department of Natural Resources, Environmental Protection Division, Georgia Power Corporation, Upper Chattahoochee River Keeper.

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.

Flow regulated by Lake Sidney Lanier since January 1956. Considerable diurnal fluctuation caused by operation of Morgan Falls hydroelectric plant 9.5 miles above station. Statistics prior to regulation are available upon request.

EXTREMES OUTSIDE PERIOD OF RECORD - Maximum stage known since at least 1896, 29.0 feet in December 1919, from flood marks at site 2.6 miles downstream and stage relation between the two sites.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge recorded, 40,900 cfs, September 21, 2009; maximum gage height recorded, 28.12 feet, September 21, 2009; minimum daily discharge, 296 cfs, September 2, 1957.

WATER-QUALITY RECORDS

PERIOD OF RECORD - May 1937 to current year.

PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: May 2002 to current year.
WATER TEMPERATURE: May 2002 to current year.
TURBIDITY: May 2002 to current year.

INSTRUMENTATION - Satellite telemetry with a continuous water-quality monitor.

REMARKS -
For period 10/01/2013-10/25/2017: Continuous water temperature and specific conductance records are rated good, turbidity record is rated poor.

Data for parameter code 63680 (turbidity) were collected using a probe with the following specifications: turbidity, water, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +/ -2.5 degrees, FNU (Formazin Nephelometric Units).

EXTREMES FOR PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: Maximum recorded, 139 microsiemens, October 19, 2017; minimum recorded, 33 microsiemens, August 13, 2005.
WATER TEMPERATURE: Maximum recorded, 28.9°C, July 21, 2017; minimum recorded, 1.6°C, December 14, 2010.
TURBIDITY: Maximum recorded, >1,310 FNU, October 1, 2006, December 10, 2004, February 4, 2011; minimum recorded, <0.5 FNU, several days.