HydroGIS Viewer


The HydroGIS Viewer is a geographic information system (GIS) web map service that allows registered users to view select key information from the NHAAP. Geospatial information that can be visualized through HydroGIS Viewer include:

The intended use of HydroGIS Viewer is for visualizing summarized data and select key geospatial information and features from the NHAAP. Please note that HydroGIS Viewer and included data layers are provisional and may undergo future revisions and updates. For specific questions regarding HydroGIS Viewer, please contact us for more information.

Please read and agree to the following terms and conditions before requesting access for HydroGIS Viewer.

Additional Resources:

User Login

Note to Users:

  • Please use Firefox, Safari, or Google Chrome browsers. Errors may result if HydroGIS is opened in Microsoft Internet Explorer.
  • HydroGIS Viewer layers occasionally do not appear after logging in on a computer with a significantly large monitor. If this occurs, please try making the browser window smaller and then reload the HydroGIS Viewer Login page before logging in again. If the issue persists, please contact the NHAAP Team for further assistance.