Document Type



Virginia Institute of Marine Science

VIMS Department/Program

Center for Coastal Resources Management (CCRM)

Publication Date



The impacts of recurrent flooding on roadways present challenging social and economic considerations for all coastal jurisdictions. Maintenance, public and private accessibility, evacuation routes, and emergency services are just a few of the common themes local governments are beginning to address for low-lying roadways currently known to flood. The project implements a protocol developed by CCRM to analyze the level at which road flooding may impact communities and their ability to reach key locations at periodic intervals; through the year 2100 in coastal Virginia. Using a network analysis, road accessibility is evaluated at different levels of flooding (at 0.1 meter flooding intervals from 0-3 meters of flooding). Portions of roads become inaccessible if one cannot travel from the locality's seat (e.g., the county courthouse) to that road because of intervening flooding. In some localities (e.g., Hampton City), roads at the county seat become flooded. In these cases, based on our definition of accessibility, the entire locality becomes inaccessible at that flooding level.


Data is in zip file, shapefile format, readable by ESRI ArcGIS Pro/ArcMap software.

Data collection methods: The road network analysis was run using open source Open Street Map road lines and flooding inundation at 0.1m increments.

Files | Description

Folder: Road_Accessibility_Datasets

  • EasternShore_Inaccessible.shp: Shapefile of roads that become inaccessible on the Eastern Shore.
  • MidPen_Inaccessible.shp: Shapefile of roads that become inaccessible on the Middle Peninsula
  • NoVA_Inaccessible.shp: Shapefile of roads that become inaccessible in Northern Virginia
  • Peninsula_Inaccessible.shp: Shapefile of roads that become inaccessible on the Peninsula



Coastal flooding, sea level rise

Associated Publications

2022 Project Data: Road accessibility from county seat under flooding


This work was funded by the Virginia Coastal Zone Management Program at the Department of Environmental Quality through Grant #NA19NOS4190163 of the U.S. Department of Commerce, National Oceanic and Atmospheric Administration, under the Coastal Zone Management Act of 1972, as amended.