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USGS Water-Year Summary 2024
021989715 SAVANNAH RIVER AT GARDEN CITY, GA
LOCATION - Lat 32°06'57.9", long 81°07'42.0" referenced to North American Datum of 1983, Chatham County, GA, Hydrologic Unit 03060109, on landward side of breasting dolphin near right bank, upstream of the Marsh Island turning basin and downstream of the Kings Island turning basin, 0.95 miles downstream of the confluence with Pipemakers Canal, 0.10 miles upstream of the confluence with Dundee Canal, and, at Garden City.
SURFACE-WATER RECORDS
PERIOD OF RECORD -
GAGE HEIGHT: November 2013 to current year.
GAGE HEIGHT: November 2013 to current year.
GAGE - Satellite telemetry with a water-stage recorder. Datum of gage is North American Vertical Datum (NAVD) of 1988 (levels by U. S. Geological Survey).
COOPERATION - Savannah Maritime Association.
REMARKS - Gage-height records are generally good. 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.
Gage height affected significantly by astronomical tides.
WATER-QUALITY RECORDS
PERIOD OF DAILY RECORD -
UPPER QW MONITOR (-13.25 feet NAVD 1988 ):
SPECIFIC CONDUCTANCE: November 2012 to current year.
pH: November 2012 to current year.
WATER TEMPERATURE: November 2012 to current year.
DISSOLVED OXYGEN: November 2012 to current year.
TURBIDITY: November 2012 to current year.
LOWER QW MONITOR (-23.28 feet NAVD 1988):
SPECIFIC CONDUCTANCE: November 2013 to current year.
WATER TEMPERATURE: November 2013 to current year.
DISSOLVED OXYGEN: November 2013 to current year.
DEPTH BELOW WATER SURFACE: November 2013 to current year.
UPPER QW MONITOR (-13.25 feet NAVD 1988 ):
SPECIFIC CONDUCTANCE: November 2012 to current year.
pH: November 2012 to current year.
WATER TEMPERATURE: November 2012 to current year.
DISSOLVED OXYGEN: November 2012 to current year.
TURBIDITY: November 2012 to current year.
LOWER QW MONITOR (-23.28 feet NAVD 1988):
SPECIFIC CONDUCTANCE: November 2013 to current year.
WATER TEMPERATURE: November 2013 to current year.
DISSOLVED OXYGEN: November 2013 to current year.
DEPTH BELOW WATER SURFACE: November 2013 to current year.
COOPERATION - Savannah Maritime Association and U.S. Army Corps of Engineers, Savannah District.
INSTRUMENTATION -
UPPER QW MONITOR (-13.25 feet NAVD 1988): Continuous water-quality monitor measuring Specific Conductance, pH, Water Temperature, Dissolved Oxygen, and Turbidity.
LOWER QW MONITOR (-23.25 feet NAVD 1988): Continuous water-quality monitor measuring Specific Conductance, Water Temperature, Dissolved Oxygen, and Depth below Water Surface.
UPPER QW MONITOR (-13.25 feet NAVD 1988): Continuous water-quality monitor measuring Specific Conductance, pH, Water Temperature, Dissolved Oxygen, and Turbidity.
LOWER QW MONITOR (-23.25 feet NAVD 1988): Continuous water-quality monitor measuring Specific Conductance, Water Temperature, Dissolved Oxygen, and Depth below Water Surface.
REMARKS -
UPPER QW MONITOR (-13.25 feet NAVD 1988): For period:10/01/2014-10/17/2017: Specific Conductance, pH, Water Temperature, Dissolved Oxygen, and Salinity records rated good; Turbidity records rated fair.
LOWER QW MONITOR (-23.25 feet NAVD 1988): For period: 10/01/2014-10/17/2017: Specific Conductance, Water Temperature, Dissolved Oxygen, Salinity records are rated good; Depth-below-Water-Surface records rated 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).
UPPER QW MONITOR (-13.25 feet NAVD 1988): For period:10/01/2014-10/17/2017: Specific Conductance, pH, Water Temperature, Dissolved Oxygen, and Salinity records rated good; Turbidity records rated fair.
LOWER QW MONITOR (-23.25 feet NAVD 1988): For period: 10/01/2014-10/17/2017: Specific Conductance, Water Temperature, Dissolved Oxygen, Salinity records are rated good; Depth-below-Water-Surface records rated 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).
EXTREMES FOR PERIOD OF RECORD -
Upper QW Monitor (-13.25 feet NAVD 1988)
SPECIFIC CONDUCTANCE: Maximum recorded, 39,000 microsiemens, November 17, 2022; minimum recorded, 54 microsiemens, February 26, 27, 28, 2020; March 15, 2020.
pH: Maximum recorded, 7.9 units, several days; minimum recorded, 6.1 units, July 22, 2013.
WATER TEMPERATURE: Maximum recorded, 30.9°C, August 21, 2016; minimum recorded, 5.4°C, January 7, 8, 2018.
DISSOLVED OXYGEN: Maximum recorded, 11.4 mg/L, January 31, 2014, and February 1, 2014; minimum recorded, 0.4 mg/L, August 21, 22, 2017.
TURBIDITY: Maximum recorded, 1,090 FNU, December 10, 2018; minimum recorded, 2.1 FNU, May 14, 2014.
SALINITY: Maximum computed, 24.8 parts-per-thousand, November 17, 2022; minimum computed, <0.04 parts-per-thousand, on many days during the period of record.
Lower QW Monitor (-23.25 feet NAVD 1988)
SPECIFIC CONDUCTANCE: Maximum recorded, 41,500 microsiemens, October 8, 2016 and October 18, 2022; minimum recorded, 54 microsiemens, February 26, 27, 28, 2020; March 07, 2020; March 15, 2020
WATER TEMPERATURE: Maximum Water Temperature: 30.8°C; July 30, 31, August 1, 18-23, 2016; minimum recorded, 5.5°C, January 31, 2014.
DISSOLVED OXYGEN: Maximum recorded, 11.3 mg/L, February 1, 2014; minimum recorded, 0.4 mg/L, August 3, 2016, August 22, 2017, and July 3, 2019.
SALINITY: Maximum computed, 26.6 parts-per-thousand, October 8, 2016 and October 18, 2022; minimum computed, <0.04 parts-per-thousand, on many days during the period of record.
DEPTH BELOW WATER SURFACE: Maximum recorded, 31.20 feet, September 11, 2017; minimum recorded, 15.42 feet, January 3, 2014.
Upper QW Monitor (-13.25 feet NAVD 1988)
SPECIFIC CONDUCTANCE: Maximum recorded, 39,000 microsiemens, November 17, 2022; minimum recorded, 54 microsiemens, February 26, 27, 28, 2020; March 15, 2020.
pH: Maximum recorded, 7.9 units, several days; minimum recorded, 6.1 units, July 22, 2013.
WATER TEMPERATURE: Maximum recorded, 30.9°C, August 21, 2016; minimum recorded, 5.4°C, January 7, 8, 2018.
DISSOLVED OXYGEN: Maximum recorded, 11.4 mg/L, January 31, 2014, and February 1, 2014; minimum recorded, 0.4 mg/L, August 21, 22, 2017.
TURBIDITY: Maximum recorded, 1,090 FNU, December 10, 2018; minimum recorded, 2.1 FNU, May 14, 2014.
SALINITY: Maximum computed, 24.8 parts-per-thousand, November 17, 2022; minimum computed, <0.04 parts-per-thousand, on many days during the period of record.
Lower QW Monitor (-23.25 feet NAVD 1988)
SPECIFIC CONDUCTANCE: Maximum recorded, 41,500 microsiemens, October 8, 2016 and October 18, 2022; minimum recorded, 54 microsiemens, February 26, 27, 28, 2020; March 07, 2020; March 15, 2020
WATER TEMPERATURE: Maximum Water Temperature: 30.8°C; July 30, 31, August 1, 18-23, 2016; minimum recorded, 5.5°C, January 31, 2014.
DISSOLVED OXYGEN: Maximum recorded, 11.3 mg/L, February 1, 2014; minimum recorded, 0.4 mg/L, August 3, 2016, August 22, 2017, and July 3, 2019.
SALINITY: Maximum computed, 26.6 parts-per-thousand, October 8, 2016 and October 18, 2022; minimum computed, <0.04 parts-per-thousand, on many days during the period of record.
DEPTH BELOW WATER SURFACE: Maximum recorded, 31.20 feet, September 11, 2017; minimum recorded, 15.42 feet, January 3, 2014.
