WebGIS Mapping Portal.

Watersheds and Hydrology of the US Virgin Islands

The following web maps and related web apps show the hydrologic features and layers of the US Virgin Islands. The data are drawn from two major data sources, the USGS's National Hydrologic Database (NHD), and the Water Resource Institute's (WRI) Watershed indicators data. The layers on the map include:

  • Hydrographic points (above/underwater type of pour point)
  • Hydrographic flow lines (streams/rivers, connectors, paths, coastline)
  • Hydrographic line features (types of hydrographic infrastructure)
  • Hydrographic core features (dams, non-earthen shore)
  • Hydrographic waterbories (lakes, ponds, swamps by type)
  • Watershed land and ocean area boundaries
  • Watershed Indicator layers (WRI):
    • Mean vulnerability to erosion indicator
    • Relative erosion potential (based on vulnerability)
    • Sediment Delivery rate (% of eroded sediment reaching the mouth river)
    • Estimated sediment delivery load (at the watershed's pour points)
    • Peak precipitation (average rainfall at the peak rainfall months)
    • Road density (% of watershed area containing roads)
    • Mean road vulnerability to erosion

In terms of the map display below, clicking on the "legend" will show the map layers. Colors depict watershed indicator levels. You can enable multiple indicators.

For a more enhanced and interactive experience, a full USVI Watershed Web App can be openned using the button below, allowing full view and exploration of watershed data, including data tables, printing maps, and enhanced visualization. You can open the full web-app application from the link on the right

Watersheds Web Map