USGS Water-Year Summary for Site 02198920

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00045 Precipitation(Sum)
	00060 Discharge(Tid.,Tid.)
	00065 Gage height(Mean,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(Min.,Med.,Max.)

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

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USGS Water-Year Summary 2023

02198920 SAVANNAH RIVER AT US 17, AT PORT WENTWORTH, GA

LOCATION - Lat 32°09'55.2", long 81°09'17.7" referenced to North American Datum of 1983, Chatham County, GA, Hydrologic Unit 03060109, at right downstream fender of bridge on GA 25, 1.3 miles downstream from confluence with Black Creek, and 1.4 miles north of Port Wentworth.

DRAINAGE AREA - Indeterminate.

REVISIONS HISTORY -

Two GNSS surveys were performed on RM3 during the 2021 calendar year (6/14/21 and 9/23/21). The solution average (8.980 feet) indicated a +0.41 ft (0.406 ft) difference in elevation from the original elevation (8.574 feet) obtained from levels. Datum at this site was originally assumed to be set to NAVD88, with no offset. On 3/22/22 the gage height record, stage-area ratings, mean discharge measurement stage, and station elevations were revised from 10/01/2007 - 01/18/22.

SURFACE-WATER RECORDS

PERIOD OF RECORD -
DISCHARGE: March 2009 to current year.
GAGE HEIGHT: October 1987 to May 1998, June 1999 to current year.
WATER VELOCITY: March 2009 to current year.

GAGE - Satellite telemetry with a water-stage recorder and an acoustic velocity meter. Datum of gage is 0.41 feet above North American Vertical Datum (NAVD) of 1988 (levels by U.S. Geological Survey). From October 1, 2001 to September 30, 2007, datum of gage was National Geodetic Vertical Datum (NGVD) of 1929. Prior to October 1, 2001, datum of gage was 3.39 feet below NGVD29.

COOPERATION - U.S. Army Corps of Engineers, Savannah District; and, Georgia Department of Natural Resources, Environmental Protection Division.

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.
Previously published as "Savannah River at US 17, at Port Wentworth, GA".

EXTREMES FOR PERIOD OF RECORD - Maximum discharge recorded, 81,700 cfs, March 12, 2020; maximum gage height recorded, 7.15 feet, September 11, 2017; minimum gage height recorded, -9.09 feet, April 7, 2009. Extremes have been adjusted to NAVD88.

CLIMATOLOGICAL RECORDS

PERIOD OF RECORD - February 2004 to September 2009, October 2010 to current year.

INSTRUMENTATION - Tipping-bucket raingage.

WATER-QUALITY RECORDS

PERIOD OF RECORD - May 1958 to June 1958, January 2001 to current year.

PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: October 1987 to May 1998, June 1999 to current year.

pH: August 2013 to current year.

WATER TEMPERATURE: November 1999 to current year.

DISSOLVED OXYGEN: August 2008 to October 2008, August 2013 to current year.

TURBIDITY: August 2013 to current year.

SALINITY: October 2010 to current year.

COOPERATION -

Discrete water-quality monitoring: Georgia Department of Natural Resources, Environmental Protection Division.

Continuous water-quality monitoring: U.S. Army Corps of Engineers, Savannah District, Savannah, GA.

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

REMARKS -

For period: 10/01/2014-10/24/2017: Continuous pH, Water Temperature, and Dissolved Oxygen records are rated "good". Continuous Specific Conductance, and Turbidity records are rated "fair". Computed Salinity records are rated "poor" for days in which values could be computed; occasional missing salinity values due to specific conductance less than allowable input for salinity computation.

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).

Analyzing agency is represented by the five-digit code listed under USGS Water Science Center special parameter code 99920. Laboratory analyses with analyzing agency code 81341 are by the Laboratory Services Section, Environmental Protection Division, Georgia Department of Natural Resources. Field determinations of Discharge, Specific Conductance, pH, Water Temperature, Air Temperature, and Dissolved Oxygen are by the U.S. Geological Survey.

EXTREMES FOR PERIOD OF DAILY RECORD -

SPECIFIC CONDUCTANCE: Maximum recorded, 37,500 microsiemens, October 18, 2022; minimum recorded, 30 microsiemens, January 2, 3, April 2-8, 10-11, 1993, October 4, 1994, October 28, 1995.

pH: Maximum recorded, 8.0 units, December 27, 2020; minimum recorded, 6.0 units, October 9, 2016.

WATER TEMPERATURE: Maximum recorded, 32.4 °C, June 7, 2008: minimum recorded, 4.0 °C, January 11, 2010.

DISSOLVED OXYGEN: Maximum recorded, 12.1 mg/L, January 7-9, 2018; minimum recorded, 0.4 mg/L, August 2, 4, 2016, September 7, 2017, September 13 & 29, 2019.

TURBIDITY: Maximum recorded, 679 FNU, September 4, 2017; minimum recorded, 2.0 FNU, July 16, 2016.

SALINITY: Maximum computed, 23.8 parts per thousand, October 18, 2022; minimum computed, <0.04 parts per thousand, many days during the period of daily record.

PHYCOERYTHRIN: Maximum recorded, 24.8 RFU; December 11, 2019; Minimum recorded, 0.6 RFU; September 01, 2020