USGS Water-Year Summary for Site 02206500

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

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Water year 2024: 2024-10-01 to 2025-09-30

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USGS Water-Year Summary 2024

02206500 YELLOW RIVER NEAR SNELLVILLE, GA

LOCATION - Lat 33°51'11", long 84°04'42" referenced to North American Datum of 1983, Gwinnett County, GA, Hydrologic Unit 03070103,

DRAINAGE AREA - 136 mi².

REVISIONS HISTORY -

Discharge above 755 cfs for the period Dec. 21, 2017, to Aug. 24, 2019, was revised on Mar. 25, 2020, based on changes to the stage-discharge rating.

SURFACE-WATER RECORDS

PERIOD OF RECORD -

DISCHARGE: October 1942 to September 1971. October 1987 to September 2002. December 2017 to current year.

GAGE-HEIGHT: August 1989 to September 1990. October 1993 to September 2002. December 2017 to current year.

GAGE - Satellite telemetry with a water-stage recorder and a continuous water-quality monitor. Datum of gage is 801.04 feet above the North American Vertical Datum (NAVD) of 1988.

COOPERATION - Gwinnett County Department of Water Resources.

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.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 12,800 cfs, October 5, 1995; maximum gage-height, 21.83 feet, October 11, 2020; minimum daily discharge, 1.6 cfs, October 8, 1954.

CLIMATOLOGICAL RECORDS

PERIOD OF RECORD - December 2017 to current year.

INSTRUMENTATION - Tipping-bucket raingage.

WATER-QUALITY RECORDS

PERIOD OF RECORD - July 2019 to current year.

PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: July 2019 to current year.
WATER TEMPERATURE: July 2019 to current year.
TURBIDITY: July 2019 to current year.

INSTRUMENTATION - Satellite telemetry with continuous water-quality monitor.

REMARKS -
For period: 07/19/2019-09/30/2019: Continuous water temperature and specific conductance records are good, turbidity record is poor.
For period: 10/01/2019-09/30/2020: Continuous water temperature and specific conductance records are good, turbidity record is 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). Hydrologic event 9 indicates a routine sample while J designates a storm event sample. Laboratory chemical analyses are by RTI Laboratory, Livonia, MI. Laboratory sediment analyses are by the U.S. Geological Survey, KY Sediment Laboratory. Field determinations of discharge, specific conductance, pH, water temperature, turbidity, barometric pressure, microbiology, air temperature, and dissolved oxygen are by the U.S. Geological Survey.

EXTREMES FOR PERIOD OF RECORD -
SPECIFIC CONDUCTANCE: Maximum recorded, 514 microsiemens, September 28, 2019; minimum recorded, 23 microsiemens, August 2, 2019 and October 10, 2020.
WATER TEMPERATURE: Maximum recorded, 28.1°C, June 17, 2022; minimum recorded, 2.8 °C, December 26, 2022.
TURBIDITY; Maximum recorded, 938 FNU, November 1, 2019; minimum recorded 1.6 FNU, December 8, 2019.