USGS Water-Year Summary for Site 02198955

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00045 Precipitation(Sum)
	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.,Max.,Min.)

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Water year 2023: 2022-10-01 to 2023-09-30

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USGS Water-Year Summary 2023

02198955 MIDDLE RIVER AT FISH HOLE AT PORT WENTWORTH, GA

LOCATION - Lat 32°08'34", long 81°08'07" referenced to North American Datum of 1983, Chatham County, GA, Hydrologic Unit 03060109, 0.3 miles upstream of confluence with Savannah (Front) River, 1.8 miles downstream of GA25, and 1.7 miles southeast of Port Wentworth.

DRAINAGE AREA - Indeterminate.

SURFACE-WATER RECORDS

PERIOD OF RECORD -
DISCHARGE: February 2014 to current year.
GAGE HEIGHT: February 2014 to current year.
WATER VELOCITY: February 2014 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 (levels by U.S. Geological Survey).

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

REMARKS - Gage-height records are generally fair. 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, 34,400 cfs, September 28, 2023; maximum gage-height recorded, 6.85 feet, October 27, 2015; minimum gage-height recorded, -8.42 feet, June 14, 2014.

CLIMATOLOGICAL RECORDS

PERIOD OF RECORD - February 2014 to current year.

INSTRUMENTATION - Tipping-bucket raingage.

WATER-QUALITY RECORDS

PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: February 2014 to October 2016, May 2017 to Nov 2023.
pH: February 2014 to October 2016, May 2017 to Nov 2023.
WATER TEMPERATURE: February 2014 to October 2016, May 2017 to Nov 2023.
DISSOLVED OXYGEN: February 2014 to October 2016, May 2017 to Nov 2023.
TURBIDITY: February 2014 to October 2016, May 2017 to Nov 2023.
SALINITY: February 2014 to October 2016, May 2017 to Nov 2023.

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

INSTRUMENTATION - in-situ water-quality sonde with sensors monitoring Specific Conductance, pH, Water Temperature, Dissolved Oxygen, and Turbidity. Data are collected at 15-minute intervals and are transmitted via satellite telemetry.

REMARKS -
For period: 10/01/2015-09/07/2016: Specific Conductance, Water Temperature, Dissolved Oxygen, and Salinity records are rated "good"; pH records rated "good", except for the period April 14-June 8, which are rated "fair"; Turbidity records are rated fair to poor, except for the period June 8-September 7, which are rated "good".
For period: 09/08/2016-10/08/2016: Specific Conductance, pH, Water Temperature, Dissolved Oxygen, Turbidity, and Salinity records are not rated. 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). Gage destroyed on October 8, 2016 from wind and storm surge resulting from Hurricane Matthew. All equipment were lost and the gage structure itself fell over and was submerged in the river.

EXTREMES FOR PERIOD OF RECORD -
SPECIFIC CONDUCTANCE: Maximum recorded, 39,800 microsiemens; October 18, 2022; minimum recorded, 19 microsiemens; February 12, 2019

pH: Maximum recorded, 8.0 units, December 06, 2023; January 02, 2024; January 14 - 15, 2024; minimum recorded, 6.1 units, June 14, 15, 2019

WATER TEMPERATURE: Maximum recorded, 31.3°C July 12, 2016; minimum recorded, 4.2°C January 4, 5 & 8, 2018.

DISSOLVED OXYGEN: Maximum recorded, 12.0 mg/L February 2, 2019; minimum recorded, 0.2 mg/L several days during period of record.

TURBIDITY: Maximum recorded, >1,100 FNU on many days during the period of record; minimum recorded, 0.8 FNU June 24, 2014.

SALINITY: Maximum computed, 25.4 parts-per-thousand, October 18, 2022; minimum computed, <0.04 parts-per-thousand on many days during period of record.