USGS Water-Year Summary for Site 02336728

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00045 Precipitation(Sum)
	00060 Discharge(Mean)
	00065 Gage height(Max.,Min.,Mean)
	00095 Specific cond at 25C(Max.,Min.,Mean)
	00300 Dissolved oxygen(Max.,Min.,Mean)
	00400 pH(Max.,Min.,Med.)
	63680 Turbidity, Form Neph(Min.,Max.,Med.)

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

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USGS Water-Year Summary 2023

02336728 UTOY CREEK AT GREAT SOUTHWEST PARKWAY, NEAR ATLANTA, GA

LOCATION - Lat 33°44'36.7", long 84°34'05.4" referenced to North American Datum of 1983, Fulton County, GA, Hydrologic Unit 03130002, on the upstream side of bridge on Great Southwest Parkway, 0.3 miles downstream from GA 70, and 0.3 miles upstream of confluence with the Chattahoochee River.

DRAINAGE AREA - 33.9 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD -
DISCHARGE: September 1994 to January 1997. October 2002 to current year.
GAGE HEIGHT: October 2002 to current year.

GAGE - Satellite telemetry with water-stage recorder and a continuous water-quality monitor. Datum of gage is 735.71 feet above NAVD88.

COOPERATION - City of Atlanta.

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, unknown, backwater from Chattahoochee River; maximum gage height recorded, 27.53 feet, September 22, 2009; minimum daily discharge 0.54 cfs, October 6-7, 2008.

CLIMATOLOGICAL RECORDS

PERIOD OF RECORD - October 2002 to current year.

INSTRUMENTATION - Tipping-bucket raingage.

WATER-QUALITY RECORDS

PERIOD OF RECORD - June 1993 to November 2010.

PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: April 2003 to current year.
pH: April 2003 to current year.
WATER TEMPERATURE: April 2003 to current year.
DISSOLVED OXYGEN: April 2003 to current year.
TURBIDITY: April 2003 to current year.

INSTRUMENTATION - Satellite telemetry with a continuous water quality monitor.

REMARKS -
For period10/01/2015-09/30/2016:Specific conductance, pH, water temperature, and dissolved oxygen record is rated good. Turbidity record is rated poor.
For period10/01/2016-09/30/2017:Specific conductance, pH, water temperature, and dissolved oxygen record is rated good. Turbidity record is rated fair.
For period10/01/2017-09/30/2018:Specific conductance, pH, water temperature, and dissolved oxygen record is rated good. Turbidity record is rated fair.
For period10/01/2018-09/30/2019:Specific conductance, pH, water temperature, and dissolved oxygen record is rated good. Turbidity record is rated fair.

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). Before October 1, 2004, turbidity data were published using parameter code 00076: turbidity, water, unfiltered, NTU (Nephelometric Turbidity Units).

EXTREMES FOR PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: Maximum recorded, 699 microsiemens, February 13, 2014; minimum recorded, 15 microsiemens, December 28, 2007 and April 5, 2022.

pH: Maximum recorded, 9.7 units, July 16, 2020; minimum recorded, 5.2 units, July 29, August 25, 2007.

WATER TEMPERATURE: Maximum recorded, 30.8°C, July 26, 2010, July 1, 2012; minimum recorded,-0.1°C, January 2, 18, 2018.

DISSOLVED OXYGEN: Maximum recorded, 14.4 mg/L, February 5, 2009; minimum recorded, <0.5 mg/L, September 18, 2004.

TURBIDITY: Maximum recorded, >2,200 FNU, June 13, 2003, May 16, 2004, June 21, 2004, and December 9, 2005; minimum recorded, 0.5 FNU, January 20, 2011, December 2, 2019.