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 Spring 2024. Existing AHPS content and features will be preserved and expanded within NWPS. The NWS is now accepting feedback on NWPS. Please visit https://www.weather.gov/owp/operations for more information.

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

Ohio River Forecast Center

Hydrograph

River at a Glance

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Probability Information Weekly Chance of Exceeding Levels Chance of Exceeding Levels During Entire Period Short-term Probabilistic Guidance (Experimental)

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Printable Image About this graph Tabular Data (UTC) Tabular Data (EST) Datum: Not Available Metadata

NOTE: River forecasts for this location take into account past precipitation and the precipitation amounts expected approximately 48 hours into the future from the forecast issuance time. Reliability of the Forecast: Based on current and forecast river, weather and reservoir conditions NOTE: Forecasts for the New River at Allisonia are issued routinely year-round.

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Upstream Gauge

Downstream Gauge

Flood Categories (in feet) Major Flood Stage: 17 Moderate Flood Stage: 13 Flood Stage: 8 Action Stage: 7 Low Stage (in feet): 0 Historic Crests (1) 23.42 ft on 08/14/1940 (2) 16.59 ft on 11/07/1977 (3) 16.56 ft on 01/15/1995 (4) 15.68 ft on 09/22/1989 (5) 15.12 ft on 10/12/2018 (6) 14.16 ft on 05/22/2020 (7) 13.72 ft on 06/05/1992 (8) 12.73 ft on 11/19/2003 (9) 12.69 ft on 08/17/1994 (10) 12.44 ft on 01/19/1996 Show More Historic Crests (P): Preliminary values subject to further review. Recent Crests (1) 5.88 ft on 05/29/2023 (P) (2) 12.10 ft on 11/12/2020 (3) 6.73 ft on 10/30/2020 (4) 14.16 ft on 05/22/2020 (5) 11.26 ft on 04/13/2020 (6) 10.47 ft on 02/07/2020 (7) 7.44 ft on 06/10/2019 (8) 8.53 ft on 04/20/2019 (9) 10.64 ft on 02/23/2019 (10) 15.12 ft on 10/12/2018 Show More Recent Crests (P): Preliminary values subject to further review. Low Water Records (1) 0.92 ft on 10/05/2007 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:15 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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13	Several summer homes along the river are flooded with possibly significant damage.
10	Water is several feet deep along portions of Clarks Ferry Road, Route 653.
9	Parts of Julia Simpkins Road, Route 693 on the right bank are cut off.
8	River begins to overflow the left bank and affect Clarks Ferry Road, Route 653.
7.5	Water begins to cover the road at 1620 Julia Simpkins Road with access to three home possibly affected.
7	Water starts to cover parts of Clarks Ferry Road at 4491 and 4661 with access to 16 homes potentially affected.
Photos (1) USGS Gage House - Dir. E: Date - 10/5/2007 (2) Upstream - Dir SW: 10/5/2007; Stage - 0.92' (586 cfs) (3) Downstream - Dir. NE: 10/5/2007; Record low flow for date

About This Location

Latitude: 36.937500° N, Longitude: 80.745833° W, Horizontal Datum: NAD83/WGS84 River Stage Reference Frame Gauge Height Flood Stage Uses NWS stage 0 ft 8 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 Not Available Not Available 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 Allisonia

Additional Information

Potential River Levels Used to Estimate the Chance of Flooding and the Range of Possible River Levels 10 Day (HEFS) 10 Day (NAEFS) 10 Day (GEFS) Note: Use the official hydrograph at the top of this web page for river levels within the next 48 hours. Click individual graphics to enlarge.

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)

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 Blacksburg Weather Forecast Office 1750 Forecast Drive Blacksburg, VA 24060 (540) 553-8900 Ask Questions/Webmaster Page last modified: 2-Nov-2020 7:30 PM Disclaimer Credits Glossary Privacy Policy About Us Career Opportunities