National Wetlands Inventory
Ecological Services

Download Seamless Wetlands Data

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Read First


Please read the Disclaimer, Data Limitations, Exclusions and Precautions, and the Wetlands Geodatabase User Caution.


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Data can be downloaded by HUC 8 Watershed Boundary or by State.  The data is downloaded as a .zip file that contains the following layers:

  • Wetlands polygon data
  • Wetlands Project Metadata (includes image dates and project information)
  • Wetlands Historic Map Information*
  • Riparian polygon data*
  • Riparian Project Metadata (includes image dates and project information)*
  • Historic Wetlands*
  • Historic Wetlands Project Metadata (includes image dates and project information)*
  • Watershed Boundary Dataset (WBD) HUC8 modified**

    * If available at the requested location.
    ** Not include in State downloads.

Information about each of these layers can be found on our Metadata page.    

There are two methods for downloading seamless wetlands data as viewed on the Wetlands Mapper:

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Wetlands Mapper

The Wetlands Mapper Download Data by Watershed tool uses the Wetlands Mapper interface to interactively download a ZIP file containing a compressed file Geodatabase and Shapefile of the watershed of interest. The tool is available by visiting the Wetlands Mapper and selecting the Download Data by Watershed tool from the Tools menu.

US States

Data by State

Each State dataset is available for download as either a compressed file Geodatabase or a Shapefile


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View Data

You can view the Geodatabase and Shapefiles by using ESRI's ArcGis Explorer free software, among others. Please note that ArcGIS version 10.* is required for Geodatabase downloads.

State and watershed data downloaded will be in an equal area Albers projection with a North American Datum (NAD) of 1983.

*AutoCAD* users: In order to view NWI data you must first add the Albers projection information into your AutoCAD library. Do this by using the MAPSCSCREATE command and click ‘c’ for coordinate system. Then input the Albers specific projection information found here.

Last updated: May 10, 2017