ALERT: Update on status of the nationwide data transmission error that prevents stream gauge data collected at affected locations from being displayed on the Advanced Hydrologic Prediction Services (AHPS) webpages. The USGS has restored the transmission from all of their gauges or has placed them in a seasonal outage (some Alaska gauges). There are a few USGS gauges that the NWS is not yet receiving the new transmissions and NWS is working to get that data by alternate means. A map of the status of USGS gauges is here. The status map of gauge outages from other agencies is here. The situation has greatly improved and will continue to improve but at a slower pace. The outage maps will now be updated once per week on Thursday. We apologize for the service interruption and hope to have the data restored as soon as possible.

Weather Forecast Office Charleston, SC

Southeast River Forecast Center

High Surf Advisory

Hydrograph

River at a Glance

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NOTE: Gauge reading affected by ocean tides. NOTE: For specific information regarding Coastal Flood Watches, Warnings, and Advisories refer to the latest Coastal Hazard Message.  During tropical cyclones, please refer here for additional storm surge information.   NOTE: Forecasts for the Savannah River at Fort Pulaski are issued routinely year-round. Vertical Datum references a tidal datum (MLLW)...for more information see Tides and Currents .

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Upstream Gauge

Flood Categories (in feet) Major Flood Stage: 10 Moderate Flood Stage: 9.6 Flood Stage: 9.2 Action Stage: 8.7 Low Stage (in feet): -4.6 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) 10.43 ft on 10/27/2015 (5) 10.40 ft on 08/11/1940 (6) 10.26 ft on 02/07/1993 (7) 10.18 ft on 11/13/2016 (8) 10.16 ft on 12/03/1971 (9) 10.11 ft on 06/22/2009 (10) 10.07 ft on 06/23/2009 Show More Historic Crests (P): Preliminary values subject to further review. Recent Crests (1) 12.24 ft on 09/11/2017 (2) 10.18 ft on 11/13/2016 (3) 12.56 ft on 10/08/2016 (4) 10.43 ft on 10/27/2015 (5) 10.07 ft on 06/23/2009 (6) 10.11 ft on 06/22/2009 (7) 10.02 ft on 09/16/2001 (8) 10.26 ft on 02/07/1993 (9) 10.16 ft on 12/03/1971 (10) 10.86 ft on 10/15/1947 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 02/15/1953 (5) -4.00 ft on 11/30/1963 Show More Low Water Records For more information on your flood risk go to www.floodsmart.gov. Show FEMA's National Flood Hazard Layers FEMA's National Flood Hazard Layers not showing? Why aren't the FEMA National Flood Hazard Layers showing on the ESRI Map? Possible reasons: There are no FEMA National Flood Hazard Layers for the location which you are viewing on ESRI Maps. The FEMA Web Mapping Service (WMS) is down. Note: Your zoom level may have changed. ESRI's zoom levels must be between 14 and 16 to show National Flood Hazard layers.

Zoom Level:16 Legend FEMA Layer 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

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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.
10.4	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	At 10.0 ft MLLW, major coastal flooding occurs. HW-80 between Savannah and Tybee Island will become impassable, cutting off Tybee Island. Around Savannah, flooding could impact 5th Ave, 10th St, 14th St, and the intersection of 6th St and Lewis Ave. Flooding will also occur on Wilmington Island, the Coffee Bluff community, and in the Burnside area including Shipyard Causeway leading to Burnside Island. Roads also become impassable Ossabaw Island and Sapelo Island including Landing Rd near Meridian.
9.6	At 9.6 ft MLLW, moderate coastal flooding occurs. Flooding of HW-80 between Savannah and Tybee Island expands. Parts of Ft. Pulaski flood including several trails. In Bryan County, water may breach docks and bulkheads on Warnell Drive near Ft. McAllister and water covers portions of Mill Hill Road. In Liberty County, flooding impacts the Halfmoon Landing area and Cattle Hammock Road near the Bermuda Bluff subdivision. In McIntosh County, several roads on the southern portion of Sapelo Island flood.
9.2	At 9.2 ft MLLW, minor coastal flooding typically begins along the southeast Georgia coast. As the tide increases to 9.4-9.5 ft MLLW parts of Highway 80 near Tybee Island becomes flooded.

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 9.2 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 5.15 Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps NGVD 29 -3.13 6.07 Older USGS topographic maps, NGVD29 benchmarks MSL -3.82 5.38 Older USGS topographic maps, MSL benchmarks Other -7.50 1.70 Mean Higher High Water (MHHW), which is used as a proxy for inundation.

Additional Information

Gage referenced to Mean Lower Low Water (MLLW). To convert to Mean Sea Level (MSL), subtract 3.82 ft. Click here to access the astronomical tide predictions for the Savannah River Entrance at 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.

Resources

Hydrologic Resources Text Products Past Precipitation Forecast Precipitation River Forecast Centers River Stage Summary SC USGS River Data GA USGS River Data Inundation Mapping Locations Drought Information

Additional Resources Area Hydrographs NWS Precipitation and River Forecasting AHPS Iframes for Developers Mobile iNWS for emergency management Flood Damage Costs/Fatalities in the US, 1903 - 2014 AHPS Web Brochure Southeast River Forecast Center NWS Flood Safety Awareness Ensemble River Forecasts Hourly Precipitation

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 Charleston, SC 29406-6162 (843) 744-0303 Ask Questions/Webmaster Page last modified: 21-Dec-2016 5:21 PM Disclaimer Credits Glossary Privacy Policy About Us Career Opportunities