USGS Water-Year Summary for Site 02198950

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00060 Discharge(Tid.,Tid.)
	00065 Gage height(Tid.,Tid.)
	00095 Specific cond at 25C(Max.,Min.,Mean)
	00300 Dissolved oxygen(Max.,Min.,Mean)
	00400 pH(Max.,Min.,Med.)
	00480 Salinity(Max.,Min.,Med.)
	63680 Turbidity, Form Neph(Med.,Min.,Max.)

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

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USGS Water-Year Summary 2024

02198950 MIDDLE RIVER AT GA 25 AT PORT WENTWORTH, GA

LOCATION - Lat 32°09'56.6", long 81°08'16.7" referenced to North American Datum of 1983, Chatham County, GA, Hydrologic Unit 03060109, at downstream side of bridge on GA 25, 1.9 miles upstream from mouth at Savannah (Front) River, and 1.8 miles northeast of Port Wentworth.

DRAINAGE AREA - Indeterminate.

SURFACE-WATER RECORDS

PERIOD OF RECORD -
DISCHARGE: June 2009 to current year.
GAGE HEIGHT: June 2009 to current year.
WATER VELOCITY: June 2009 to current year.

GAGE - Satellite telemetry with a water-stage recorder and an acoustic velocity meter. Datum of gage is the North American Vertical Datum (NAVD) of 1988 (from U.S. Geological Survey levels). Prior to October 1, 2010, the datum of gage was 11.5 feet below the North American Vertical Datum (NAVD) of 1988.

COOPERATION - Georgia Department of Natural Resources, WYs 2009-2014; U.S. Army Corps of Engineers, Savannah District, 2015WY to current year.

REMARKS - Gage-height records are generally good. Water velocity records are generally fair. Discharge records are generally fair. 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.

Streamflow at this site is affected significantly by astronomical tides. By convention, the U.S. Geological Survey has established ebb (seaward) flows as positive flows and flood (landward) flows as negative flows.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge recorded, 31,000 cfs, October 8, 2016; maximum gage height recorded, 8.37 feet, September 11, 2017; minimum gage height recorded, -6.76 feet, January 3, 2014.
Extremes have been adjusted to NAVD of 1988.

WATER-QUALITY RECORDS

PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: August 2013 to current year.
pH: August 2013 to current year.
WATER TEMPERATURE: August 2013 to current year.
DISSOLVED OXYGEN: August 2013 to current year.
TURBIDITY: August 2013 to current year.
SALINITY: August 2013 to current year.

COOPERATION - U.S. Army Corps of Engineers, Savannah District.

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

REMARKS -
For period:10/01/2014-10/16/2017: Specific Conductance, pH, Water Temperature, Dissolved Oxygen, and Salinity records are rated good; Turbidity records are 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).

EXTREMES FOR PERIOD OF DAILY RECORD -

SPECIFIC CONDUCTANCE: Maximum recorded, 32,000 microsiemens, October 7, 2016; minimum recorded,24 microsiemens; April 21, 2022 and February 06, 21, 2023.

pH: Maximum recorded, 8.0 units, January 14 - 15, 2024; minimum recorded, 6.2 units, September 15, 2017 and August 28, 29, 2019.

WATER TEMPERATURE: Maximum recorded, 31.4°C, August 16, 2016; minimum recorded, 3.3°C, January 4, 2018.

DISSOLVED OXYGEN: Maximum recorded, 11.6 mg/L, January 7, 8, 2018; minimum recorded, 1.0 mg/L, August 19 and 23, 2016.

TURBIDITY: Maximum recorded, 1100 FNU, May 14, 2018; minimum recorded, 1.6 FNU, June 8, 2022.

SALINITY: Maximum computed, 19.9 parts-per-thousand, October 7, 2016; December 06, 2023; minimum computed, <0.04 parts-per-thousand, many days during the period of daily record.

PHYCOERYTHRIN: Maximum Recorded, 23.6 RFU; July 22, 2020. Minimum Recorded, 0.8 RFU; June 11, 2020