National Weather Service Advanced Hydrologic Prediction Service

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Visit https://www.weather.gov/owp/operations for access to new EXPERIMENTAL products and services from the National Water Center: National Hydrologic Discussion, Area Hydrologic Discussion, Flood Hazard Outlook and the National Water Center Visualization Services, a suite of geospatial services depicting River Forecast Center and National Water Model information.

Weather Forecast Office Charleston, SC

Southeast River Forecast Center

Hydrograph

River at a Glance

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Savannah River at Fort Pulaski (IN MLLW)

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About this graph

Tabular Data (UTC)

Tabular Data (EDT)

Datum: Not Available

Metadata

NOTE: During a Tropical Storm or Hurricane Watch or Warning, inundation mapping provided by the National Hurricane Center (go to the web site and select the storm of interest) reflects a reasonable worst case scenario. The forecast above is the total water forecast that is most likely to occur.

NOTE: Forecasts for the Savannah River at Fort Pulaski (IN MLLW) are issued routinely year-round.

Vertical Datum references a tidal datum (MLLW)...for more information see Tides and Currents .

Return to Area Map

Upstream Gauge

Flood Categories (in feet)

Major Flood Stage:	10.5
Moderate Flood Stage:	10
Flood Stage:	9.5
Action Stage:	9.2
Low Stage (in feet):	-2

Historic Crests
(1) 12.56 ft on 10/08/2016
(2) 12.24 ft on 09/11/2017
(3) 10.86 ft on 10/15/1947
(4) 10.45 ft on 11/07/2021
(5) 10.43 ft on 10/27/2015
(6) 10.40 ft on 08/11/1940
(7) 10.26 ft on 02/07/1993
(8) 10.25 ft on 11/23/2018
(9) 10.18 ft on 11/13/2016
(10) 10.15 ft on 12/03/1971
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 9.75 ft on 06/15/2022
(2) 9.76 ft on 05/17/2022
(3) 10.11 ft on 11/08/2021
(4) 10.45 ft on 11/07/2021
(5) 9.80 ft on 11/06/2021
(6) 10.00 ft on 11/05/2021
(7) 9.96 ft on 11/15/2020
(8) 10.02 ft on 10/18/2020
(9) 9.74 ft on 09/21/2020
(10) 9.81 ft on 09/20/2020
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) -4.60 ft on 03/21/1936
(2) -4.20 ft on 03/13/1993
(3) -4.10 ft on 03/03/1942
(4) -4.00 ft on 01/24/1940
(5) -4.00 ft on 02/15/1953
Show More Low Water Records

For more information on your flood risk go to www.floodsmart.gov.

Show FEMA's National Flood Hazard Layers

Zoom Level:16

	Gauge Location	Disclaimer
Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.

Flood Impacts & Photos

If you notice any errors in the below information, please contact our Webmaster
12.56	Record tide level reached in association with Hurricane Matthew which made landfall near McClellanville, SC as a Category 1 hurricane on October 8th, 2016.
12.24	Peak tide level reached in association with Tropical Storm Irma on September 11th, 2017.
10.86	Peak tide level reached in association with an unnamed hurricane that made landfall near Ossabaw Island, GA as a Category 2 hurricane on October 15th, 1947.
10.5	At 10.5 ft MLLW, major coastal flooding occurs. Damaging flooding is expected, expanding along the entire southeast Georgia coast. Flooding will likely cause the closure of HW-80, isolating residents on Tybee Island. Several other island communities will also likely become isolated due to flooded and impassable roadways. On Tybee Island, widespread significant flooding is expected with numerous properties impacted.
10.4	Peak tide level reached in association with an unnamed hurricane that made landfall near Hilton Head Island, SC as a Category 2 hurricane on August 11th, 1940.
10.02	Peak tide level reached in association with Tropical Storm Gabrielle as it moved away from the Southeast coast on September 16th, 2001.
10	At 10.0 ft MLLW, moderate coastal flooding occurs. Shipyard Rd will be impassable, isolating residents on Burnside Island. Water will start to encroach on HW-80 and as the tide gets closer to 10.5 ft MLLW, could begin to cover portions of the roadway. Flooding will expand on Tybee Island and Catalina Dr and Lewis Ave will be impassable. Flooding will also impact Wilmington Island, the Coffee Bluff community, Ossabaw Island, Sapelo Island, and portions of HW-17 south of Darien.
9.5	At 9.5 ft MLLW, minor coastal flooding occurs. Flooding will begin to impact Shipyard Road to Burnside Island. Parts of Ft Pulaski National Monument will begin to flood, including several trails. Flooding will also begin to impact Tybee Island including Catalina Dr and Lewis Ave. In Bryan County, water could breach docks near Ft McAllister and flooding will impact portions of Mill Hill Rd. In Liberty County, flooding impacts the Halfmoon Landing area and Cattle Hammock Rd near Bermuda Bluff subdivision.

Low Water Impacts

If you notice any errors in the below information, please contact our Webmaster

-2.0	At -2.0 ft MLLW, very low water levels will occur along the southeast Georgia coast. This could cause navigation issues along the coast including tidal creeks, inlets, and in marsh areas. Also, areas that are normally under water could be exposed.

About This Location

Latitude: 32.034680° N, Longitude: 80.903029° W, Horizontal Datum: NAD83/WGS84

River Stage Reference Frame	Gauge Height	Flood Stage	Uses
NWS stage	0 ft	9.5 ft	Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum	Elevation (gauge height = 0)	Elevation (gauge height = flood stage)	Elevation information source
NAVD88	-4.05	5.45	Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29	-3.14	6.36	Older USGS topographic maps, NGVD29 benchmarks
MSL	-3.82	5.68	Older USGS topographic maps, MSL benchmarks
Other	-7.50	2.00	Mean Higher High Water (MHHW), which is used as a proxy for inundation.

Additional Information

Gage data plotted here is referenced to Mean Lower Low Water (MLLW). Click here to view other datums as well as the astronomical tide predictions for Fort Pulaski. These predictions do not incorporate effects such as wind which can increase values by as much as 2 ft during non-tropical events.

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Collaborative Agencies

The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.

NWS Information

National Weather Service
Charleston Weather Forecast Office
5777 South Aviation Avenue
North Charleston, SC 29406
(843) 747-5860
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Page last modified: 2-Nov-2020 7:30 PM

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