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Web Portal Changes: In Spring 2024, the Advanced Hydrologic Prediction Service (AHPS) hosted at will be replaced by the National Water Prediction Service (NWPS) at a repurposed A preview of NWPS is available here, where you can see your station hydrograph by replacing SSSSS with the station 5-character id:

Flood Inundation Mapping: Experimental real-time flood Inundation mapping services for 10% of the United States are now available via the NWS Map Viewer. Additional products and geospatial services depicting River Forecast Center and National Water Model forecasts continue to be accessible as described in the StoryMap here.

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Hydrograph River at a Glance Download
Savannah River at Hartwell Dam Pool (ft)Observed: 660.22 ft at 7:00AM Feb 24, 2024Observed: 660.31 ft at 7:00AM Feb 25, 2024Observed: 660.43 ft at 7:00AM Feb 26, 2024Observed: 660.36 ft at 7:00AM Feb 27, 2024Observed: 660.24 ft at 7:00AM Feb 28, 2024Observed: 660.22 ft at 7:00AM Feb 29, 2024Observed: 660.17 ft at 7:00AM Mar 01, 2024Observed: 660.83 ft at 7:00AM Mar 02, 2024Highest Observation: 661.05 ft at 7:00AM Mar 03, 2024HRTG1(plotting HPIRZ) Graph Created (5:36AM Mar 4, 2024)ObservedLatest observed value: 661.05 ft at 7:00 AM EST 3-Mar-2024. Flood Stage is 665 ft
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Tabular Data (UTC)
Tabular Data (EST)
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Datum: Not Available
NOTE: The above river forecast includes future rainfall. Forecast stages may be different if the rainfall does not occur.

Reliability of the Forecast: Based on current and forecast river, weather and reservoir conditions

NOTE: Forecasts for the Savannah River at Hartwell Dam are issued routinely year-round.

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Upstream Locations Upstream Gauge Downstream Gauge Downstream Gauge - near Savannah River
Flood Categories (in feet)
Major Flood Stage: 680
Moderate Flood Stage: 670
Flood Stage: 665
Action Stage: 662
Low Stage (in feet): -9999

Historic Crests
(1) 665.40 ft on 04/08/1964
(2) 664.83 ft on 01/05/2016
(3) 664.79 ft on 07/09/2013
(4) 664.76 ft on 04/08/1994
(5) 664.08 ft on 03/17/1996
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 664.83 ft on 01/05/2016
(2) 664.79 ft on 07/09/2013
(3) 652.97 ft on 03/19/2012
(4) 661.14 ft on 04/16/2011
(5) 662.63 ft on 02/08/2010
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 637.48 ft on 12/10/2008
(2) 642.32 ft on 10/21/2008
(3) 642.40 ft on 12/24/1981
(4) 643.85 ft on 01/03/1982
(5) 644.77 ft on 12/16/2011
Show More Low Water Records
Zoom Level:16
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Gauge LocationGauge Map Marker
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 Collapse
If you notice any errors in the below information, please contact our Webmaster
675 Some campgrounds on islands on the lake may be affected.
670 Islands above and below the dam will become partially covered.
668 Water will be at the bottom of the bridge on Conerross Creek at Highway S-184, Martin Creek at Highway S-65 and Seneca Creek at Highway S-210.
667.5 Water will be at the bottom of the Highway SC71 bridge over 26 Mile Creek.
665 Recreation areas near the lake such as Long Point, Ashbury, Singing Pines, South Carolina River, Boyles and 12 Mile will be closed. Camping areas such as Springfield, Oconee Point, Watsadler and Georgia River will likely be closed. Creeks that drain into the lake will be effected by backwater especially on Old Jewell Road. Floating faclilites on the lake and along the banks of the lake will begin to flood.
664.5 Backwater affects on local streams will cause flooding of some low areas and roads such as dr johns road. Picnic areas, boat ramps, campgrounds and recreation areas near the lake shoreline will begin to flood.
663 At this stage water starts to flood low spots in yards of homes along the lake and water starts to backup into local creeks that feed into the lake.
662 Water management threshold, expect more frequent inflow forecasts.
660 Normal full pool level
About This Location Collapse

Latitude: 34.357300° N, Longitude: 82.822400° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 665 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum Elevation
(gauge height = 0)
(gauge height = flood stage)
Elevation information source
NAVD88 Not Available Not Available Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 Not Available Not Available Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other 0 ft 665 ft  

Current/Historical Observations:

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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
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Greenville-Spartanburg Weather Forecast Office
1549 GSP Drive
Greer, SC 29651
(864) 848-3859
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