USGS Water-Year Summary for Site 021989792

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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(Max.,Min.,Med.)

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

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USGS Water-Year Summary 2024

021989792 LITTLE BACK RIVER AT GA 25 AT PORT WENTWORTH, GA

LOCATION - Lat 32°09'57", long 81°07'48" referenced to North American Datum of 1983, Chatham County, GA, Hydrologic Unit 03060109, at downstream side of bridge on GA 25, 9.9 miles from mouth at Savannah River, and 2.25 miles northeast of Pt. Wentworth, GA.

DRAINAGE AREA - Indeterminate.

SURFACE-WATER RECORDS

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

GAGE - Satellite telemetry with a water-stage recorder and 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 12.2 feet below the North American Vertical Datum (NAVD) of 1988.

COOPERATION - Georgia Department of Natural Resources, Environmental Protection Division.

REMARKS - Gage-height records are generally good. Water velocity records are generally good. 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, 15,800 cfs, December 2, 2009; maximum gage-height recorded, 8.01 feet, September 11, 2017; minimum gage-height recorded, -6.47 feet, April 16, 2018. Extremes have been adjusted to NAVD of 1988.

WATER-QUALITY RECORDS

REMARKS -
For period 10/01/2014-10/03/2017: Specific Conductance, pH, Dissolved Oxygen, Turbidity, and Salinity records rated fair; Water Temperature records rated good.

EXTREMES FOR PERIOD OF RECORD -

SPECIFIC CONDUCTANCE: Maximum recorded, 24,300 microsiemens, October 8, 2016; minimum recorded, 47 microsiemens; March 5 and 6, 2020.

pH: Maximum recorded, 7.7 units; April 12, 13, 20, 21, 2018; Minimum recorded, 6.0 units; August 14, 15, 2017.

WATER TEMPERATURE: Maximum recorded, 31.5°C, July 30, 2016, August 16, 2016; minimum recorded, 2.8°C, January 04, 2018.

DISSOLVED OXYGEN: Maximum recorded, 11.4 mg/L, January 4, 5, 7, 8, 9, 2018; minimum recorded, 1.9 mg/L, August 23, 2016

TURBIDITY: Maximum recorded, 367 FNU; July 05, 2019; minimum recorded, 1.4 FNU, November 23, 2013.

SALINITY: Maximum computed, 14.7 parts-per-thousand, October 8, 2016; minimum computed, <0.04 parts-per-thousand on many days for the period of record.

PHYCOERYTHRIN: Maximum Recorded, 100 RFU; August 25, 2020. Minimum Recorded, 0.7 RFU; October 05 and 06, 2020