Web Portal Changes: The Advanced Hydrologic Prediction Service (AHPS) hosted at https://water.weather.gov will be replaced by the National Water Prediction Service (NWPS), with a target of March 2024. Existing AHPS content and features will be preserved and expanded within NWPS.

Experimental National Water Center Products: Flood Inundation Mapping services are now available for 10% of the U.S. population. Please visit https://www.weather.gov/owp/operations for more information. The National Hydrologic Discussion, Area Hydrologic Discussion, Flood Hazard Outlook, and real-time geospatial services depicting River Forecast Center and National Water Model forecasts, continue to be accessible via the URL above, as described in the StoryMap here.

Weather Forecast Office Blacksburg, VA

Southeast River Forecast Center

Hydrograph

River at a Glance

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Printable Image About this graph Tabular Data (UTC) Tabular Data (EDT) Datum: NGVD29 Metadata

NOTE: Forecasts are not available for the South Fork Roanoke River near Shawsville. Only observed stages are available for this point.

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Downstream Gauge

Flood Categories (in feet) Major Flood Stage: 9 Moderate Flood Stage: 7 Flood Stage: 5 Action Stage: 4 Low Stage (in feet): 0 Historic Crests (1) 11.12 ft on 06/21/1972 (2) 9.32 ft on 09/29/2015 (3) 9.27 ft on 09/21/1979 (4) 9.18 ft on 10/11/2018 (5) 8.88 ft on 01/31/2013 (6) 8.88 ft on 09/06/1996 (7) 8.86 ft on 09/28/2004 (8) 8.82 ft on 09/17/2018 (9) 8.81 ft on 11/04/1985 (10) 8.66 ft on 02/22/2003 Show More Historic Crests (P): Preliminary values subject to further review. Recent Crests (1) 5.64 ft on 05/29/2023 (P) (2) 8.20 ft on 11/12/2020 (3) 7.09 ft on 06/18/2020 (4) 7.68 ft on 05/21/2020 (5) 6.83 ft on 04/13/2020 (6) 4.60 ft on 02/07/2020 (7) 9.18 ft on 10/11/2018 (8) 8.82 ft on 09/17/2018 (9) 5.60 ft on 05/05/2017 (10) 5.19 ft on 04/24/2017 Show More Recent Crests (P): Preliminary values subject to further review. Low Water Records (1) 0.29 ft on 08/14/2002 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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9.5	Flooding begins on portions of Alleghany Springs Road (Route 637) downstream from the gage.
9	Water reaches bottom of route 638 bridge upstream from the gage.
8	Water reaches the base of the river gage.
7.5	Water over Old Roanoke Road off Route 460 between Shawsville and Lafayette.
7	Fields up and downstream from the gage are flooded. Water reaches the base of several elevated homes on Old Roanoke Road off of route 460.
5	Minor overbank flooding begins adjacent to the river.
Photos (1) USGS/IFLOWS Gage house w/ TB rain gage on DS RB (2) DS view from SR 637 bridge - Dir. E; Date: 11/9/05; Stage: 1.07' (3) US view from SR 637 bridge - Dir. W; Date: 11/9/05; Stage: 1.07' (4) DS LB - Wire weight gage on bridge visible - Dir. NNE (5) DS RB and gage house from SR 637 - Dir. SE (6) SR 637 bridge over the South Fork Roanoke River - Dir. NW

About This Location

Latitude: 37.141110° N, Longitude: 80.265500° W, Horizontal Datum: NAD83/WGS84 River Stage Reference Frame Gauge Height Flood Stage Uses NWS stage 0 ft 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 Not Available Not Available Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps NGVD 29 1361.87 1366.87 Older USGS topographic maps, NGVD29 benchmarks MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks Other Not Available Not Available   Current/Historical Observations: U.S. Geological Survey (USGS) Data and Site Info for Shawsville

Resources

Hydrologic Resources Text Products Past Precipitation Forecast Precipitation River Forecast Centers River Stage Summary Ohio Basin Water Resources Outlook Inundation Mapping Locations

Additional Resources Area Hydrographs NWS Precipitation and River Forecasting AHPS Iframes for Developers Mobile iNWS for emergency management Drought Information Precipitation Frequency Data Standardized Precipitation Index (WRCC) Snow Information Ensemble River Forecasts (MMEFS)

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