USGS Water-Year Summary for Site 02203700

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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.,Med.,Max.)

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Water year 2025: 2025-10-01 to 2026-09-30

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USGS Water-Year Summary 2025

02203700 INTRENCHMENT CREEK NEAR ATLANTA, GA

LOCATION - Lat 33°41'20.5", long 84°19'48.4" referenced to North American Datum of 1983, Dekalb County, GA, Hydrologic Unit 03070103, at the bridge on Constitution Road, 0.5 miles upstream from confluence with South River, 1.1 miles east of US 23, 1.0 miles southeast of Thomasville, and 2.0 miles south of Atlanta.

DRAINAGE AREA - 10.6 mi². (revised).

REVISIONS HISTORY -

WDR GA-2010: Datum.

Gage datum was revised on March 21, 2022, based on an error in the determination of the gage datum.

SURFACE-WATER RECORDS

PERIOD OF RECORD -
DISCHARGE: Water Years 1961, 1963, and 1964 (annual maximum), April 2003 to current year.
GAGE-HEIGHT: Water Years 1961, 1963, and 1964 (annual maximum), April 2003 to current year.

GAGE - Satellite telemetry with water-stage recorder. Datum of gage is 771.48 feet above NAVD88.

COOPERATION - City of Atlanta.

REMARKS - Gage-height records are generally 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 4,100 cfs, March 25, 1964, maximum gage-height, 14.53 feet, at datum then in use; minimum gage-height recorded, 1.80 feet, October 13, 2003 and June 12, 2004; minimum daily discharge recorded, 0.29 cfs, August 22, 2007.

CLIMATOLOGICAL RECORDS

PERIOD OF RECORD - April 2003 to current year.

INSTRUMENTATION - Tipping-bucket raingage.

WATER-QUALITY RECORDS

PERIOD OF RECORD - March 1999 to July 2000, August 2003 to current year.

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

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

REMARKS -
For period:10/01/2014-09/30/2015: Continuous water temperature and specific conductance records are good; dissolved oxygen and pH records are fair; turbidity records are poor.
For period:10/01/2015-09/30/2016: Continuous water temperature and specific conductance records are good; dissolved oxygen and pH records are fair; turbidity records are poor.
For period:10/01/2016-09/30/2017: Continuous water temperature and specific conductance records are good; dissolved oxygen and pH records are fair; turbidity records are poor.
For period:10/01/2017-09/30/2018: Continuous water temperature and specific conductance records are good; dissolved oxygen and pH records are fair; turbidity records are poor.
For period:10/01/2018-09/30/2019: Continuous water temperature and specific conductance records are good; dissolved oxygen and pH records are fair; turbidity records are poor.

Data for parameter code 63680 (turbidity) were collected using a probe with the following specifications: turbidity, water, monochrome near infra-red LED light, 780-900nm, 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). Hydrologic event J designates a storm event sample. Laboratory chemical analyses are by RTI Laboratories, Livonia, MI. Laboratory sediment analyses are by the U.S. Geological Survey, Kentucky Sediment Laboratory. Field determinations of discharge, specific conductance, pH, water temperature, turbidity, microbioloigy, and dissolved oxygen are by the U.S. Geological Survey

EXTREMES FOR PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: Maximum, 2,190 microsiemens, December 22, 2006; minimum, 25 microsiemens, September 17, 2020.
pH: Maximum, 11.9 units, December 16, 2007; minimum, 2.9 units, December 22, 2006, December 3, 2022.
WATER TEMPERATURE: Maximum, 30.8 °C, July 26, 2010; minimum, -0.1°C, January 30, 2014.
DISSOLVED OXYGEN: Maximum, 19.5 mg/L, March 24, 2009; minimum, <0.5 mg/L on several days.
TURBIDITY: Maximum, >2,200 FNU on several days; minimum, <0.5 FNU on many days.