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USGS Water-Year Summary 2025
02334578 LEVEL CREEK AT SUWANEE DAM ROAD, NEAR SUWANEE, GA
LOCATION - Lat 34°05'47", long 84°04'41" referenced to North American Datum of 1983, Gwinnett County, GA, Hydrologic Unit 03130001, 20.0 feet upstream of the culvert on Suwanee Dam Road, 2.4 miles upstream from the confluence with the Chattahoochee River.
DRAINAGE AREA - 5.06 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD -
DISCHARGE: May 2001 to current year.
GAGE-HEIGHT: May 2001 to current year.
DISCHARGE: May 2001 to current year.
GAGE-HEIGHT: May 2001 to current year.
GAGE - Satellite telemetry with a water-stage recorder and continuous water-quality monitor. Datum of gage is 956.47 feet above the North American Vertical Datum (NAVD) of 1988 (leveling by Global Positioning System equipment).
COOPERATION - Gwinnett County Department of Water Resources.
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 recorded 2400 cfs May 19, 2013; maximum gage-height recorded, 13.04 feet, May 19, 2013; minimum daily discharge, 0.05 cfs, November 13, 2016.
CLIMATOLOGICAL RECORDS
PERIOD OF RECORD - May 2001 to current year.
INSTRUMENTATION - Tipping-bucket raingage.
WATER-QUALITY RECORDS
PERIOD OF RECORD - July 2001 to current year.
PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: March 2001 to current year.
WATER TEMPERATURE: March 2001 to current year.
TURBIDITY: March 2001 to current year.
SPECIFIC CONDUCTANCE: March 2001 to current year.
WATER TEMPERATURE: March 2001 to current year.
TURBIDITY: March 2001 to current year.
INSTRUMENTATION - Satellite telemetry with a continuous water-quality monitor and an automatic refrigerated sampler.
REMARKS -
For period 10/01/2013-09/30/2014: Water temperature records are good. Specific conductance records are good. Turbidity records are poor.
For period 10/01/2014-09/30/2015: Water temperature records are good. Specific conductance records are good. Turbidity records are poor.
For period 10/01/2015-09/30/2016: Water temperature records are good. Specific conductance records are good. Turbidity records are poor.
For period 10/01/2016-09/30/2017: Water temperature records are good. Specific conductance records are fair. Turbidity records are poor.
For period 10/01/2017-09/30/2018: Water temperature records are good. Specific conductance records are fair. Turbidity records are poor.
For period 10/01/2018-09/30/2019: Water temperature records are good. Specific conductance 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, 780-900 nm, detection angle 90 +/-2.5 degrees, FNU (Formazin Nephelometric Units). Prior to October 1, 2004, turbidity data were published using parameter code 00076: turbidity, water, unfiltered, NTU (Nephelometric Turbidity Units). Hydrologic event 9 indicates a routine sample while 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, gage height, specific conductance, pH, water temperature, air temperature, turbidity, barometric pressure and dissolved oxygen are by the U.S. Geological Survey.
For period 10/01/2013-09/30/2014: Water temperature records are good. Specific conductance records are good. Turbidity records are poor.
For period 10/01/2014-09/30/2015: Water temperature records are good. Specific conductance records are good. Turbidity records are poor.
For period 10/01/2015-09/30/2016: Water temperature records are good. Specific conductance records are good. Turbidity records are poor.
For period 10/01/2016-09/30/2017: Water temperature records are good. Specific conductance records are fair. Turbidity records are poor.
For period 10/01/2017-09/30/2018: Water temperature records are good. Specific conductance records are fair. Turbidity records are poor.
For period 10/01/2018-09/30/2019: Water temperature records are good. Specific conductance 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, 780-900 nm, detection angle 90 +/-2.5 degrees, FNU (Formazin Nephelometric Units). Prior to October 1, 2004, turbidity data were published using parameter code 00076: turbidity, water, unfiltered, NTU (Nephelometric Turbidity Units). Hydrologic event 9 indicates a routine sample while 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, gage height, specific conductance, pH, water temperature, air temperature, turbidity, barometric pressure and dissolved oxygen are by the U.S. Geological Survey.
EXTREMES FOR PERIOD OF RECORD -
SPECIFIC CONDUCTANCE: Maximum recorded, 421 microsiemens, May 16, 2008; minimum recorded, 15 microsiemens, December 1, 2018.
WATER TEMPERATURE: Maximum recorded, 28.1°C, July 28, 2023; minimum recorded, 0.3°C, December 24, 2022.
TURBIDITY: Maximum recorded, >2,200 FNU many days; minimum recorded, 0.6 FNU, December 28, 29, 2010.
SPECIFIC CONDUCTANCE: Maximum recorded, 421 microsiemens, May 16, 2008; minimum recorded, 15 microsiemens, December 1, 2018.
WATER TEMPERATURE: Maximum recorded, 28.1°C, July 28, 2023; minimum recorded, 0.3°C, December 24, 2022.
TURBIDITY: Maximum recorded, >2,200 FNU many days; minimum recorded, 0.6 FNU, December 28, 29, 2010.
