USGS Water-Year Summary for Site 02335000

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00045 Precipitation(Sum)
	00060 Discharge(Mean)
	00065 Gage height(Mean)
	00095 Specific cond at 25C(Max.,Min.,Mean)
	63680 Turbidity, Form Neph(Mean,Min.,Med.,Max.)

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

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USGS Water-Year Summary 2023

02335000 CHATTAHOOCHEE RIVER NEAR NORCROSS, GA

LOCATION - Lat 33°59'50", long 84°12'07" referenced to North American Datum of 1983, Gwinnett County, GA, Hydrologic Unit 03130001, on downstream side of right bank pier of bridge on GA 141, 1.5 miles upstream from Johns Creek, 4.5 miles north of Norcross, 6.5 miles downstream from Suwanee Creek, 18.0 miles downstream from Buford Dam, and at mile 330.8.

DRAINAGE AREA - 1,170 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD -
DISCHARGE: October 1902 to September 1946, October 1956 to current year. Monthly discharge only for October to December 1902, published in WSP 1304.
GAGE HEIGHT: October 1998 to current year.

GAGE - Satellite telemetry with a water-stage recorder and a continuous water-quality monitor. Datum of gage is 878.15 feet above North American Vertical Datum (NAVD) of 1988 (leveling by Global Positioning System equipment). Prior to July 13, 1955, a non-recording gage was located at a site 500 feet downstream at same datum. From July 14, 1955 to March 11, 1957, a non-recording gage was located at present site and datum.

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

REMARKS - Gage-height records are generally good to fair. 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, 55,000 cfs, January 8, 1946; maximum gage-height recorded, 27.70 feet, January 8, 1946; minimum daily discharge, 132 cfs, August 25, 1925.

EXTREMES FOR PERIOD PRIOR TO REGULATION - Maximum discharge recorded, 55,000 cfs, January 8, 1946, from rating curve extended above 36,000 cfs on basis of peak flows over Morgan Falls Dam; maximum gage-height recorded, 27.70 feet, January 8, 1946.

CLIMATOLOGICAL RECORDS

PERIOD OF RECORD - June 2002 to July 2009, October 2010 to current year.

INSTRUMENTATION - Tipping-bucket raingage.

WATER-QUALITY RECORDS

PERIOD OF RECORD - August 1941 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 - Continuous water temperature records and specific conductance records are generally good. Turbidity records are generally 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 DAILY RECORD -
SPECIFIC CONDUCTANCE: Maximum recorded, 119 microsiemens, April 13, 2013; minimum recorded, 25 microsiemens, May 19, 2013.
WATER TEMPERATURE: Maximum recorded, 23.6°C, July 25, 2021; minimum recorded, 4.0°C, February 13, 2014.
TURBIDITY: Maximum recorded, >2,090 FNU, September 17, 2004; minimum recorded, <0.5 FNU, on many days.