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This probabilistic forecast is issued by the Middle Atlantic River Forecast Center.
tab left off Hydrograph tab right off tab left off River at a Glance tab right off tab left off Download tab right off tab left on tab right on
About this graph
Forecasts for the South Branch Potomac River at Franklin are issued routinely year-round.
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Downstream Gauge Downstream Gauge - near Petersburg
Zoom Level:14
Flood Categories (in feet)
Major Flood Stage: 11
Moderate Flood Stage: 9
Flood Stage: 7
Action Stage: 6
Low Stage (in feet): -9999

Historic Crests
(1) 22.58 ft on 11/04/1985
(2) 19.16 ft on 09/06/1996
(3) 16.06 ft on 01/19/1996
(4) 12.26 ft on 11/19/2003
(5) 12.14 ft on 09/19/2003
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 7.92 ft on 09/23/2021
(2) 6.68 ft on 04/08/2021
(3) 6.48 ft on 03/01/2021
(4) 8.89 ft on 06/18/2020
(5) 9.10 ft on 04/16/2018
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 1.30 ft on 09/25/1959
KML Image
Gauge LocationGauge Map Marker
 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 Collapse
If you notice any errors in the below information, please contact our Webmaster
13 The lowest end of the Route 220/12 bridge begins to flood.
11 Homes along Dickenson Mountain Road are flooded.
9 Several roads in or near Franklin are flooded, including Dickenson Mountain Road (Route 220/12), parts of US Route 220, County Route 220/13, and Taylor Hollow Road.
8 The Franklin city park begins to flood.
7 A low spot on Dickenson Mountain Road (Route 220/12) 300 feet downstream from the bridge begins to flood.
6.5 Water begins to cover Taylor Hollow Road in Franklin.
5 Water begins to overflow the low water crossing on County Route 220/12 at the south end of town.

Other Real-time and/or Archive Data Sources:
Additional Information Collapse
Potential River Levels - Used to
Potential River Levels
Used to Estimate the Chance of Flooding and the Range of Possible River Levels
10 Day (HEFS) 7 Day (NAEFS) 7 Day (GEFS)
HEFS Ensemble NAEFS Ensemble  GEFS Ensemble 

Note: Use the official hydrograph at the top of this web page for river levels within the next 72 hours.

Click individual graphics to enlarge.
Collaborative Agencies Collapse
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
(Baltimore/Washington) Sterling Weather Forecast Office
43858 Weather Service Rd.
Sterling, VA 20166
(703) 996-2200
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