The Association of State Wetland Managers in collaboration with Virginia Tech’s Conservation Management Institute (CMI) and the U.S. Fish and Wildlife Service’s Northeast Region created Wetlands One-Stop Mapping to provide easy online access to geospatial data on wetlands and soils produced by federal and state agencies.  The U.S. Fish and Wildlife Service (FWS), through its National Wetland Inventory (NWI), has produced wetland geospatial data for most of the country. While different agencies post data on their own sites, there is not a single place to go for these data. Wetlands One-Stop Mapping provides links to these and other websites. It provides online access to classification tools for adding hydrogeomorphic-type to wetland inventory data and the results of NWI+ projects (maps and reports). The geospatial information is linked to aerial imagery (and topographic maps) through ESRI’s ArcGIS (including ArcGIS Explorer) for easy viewing of wetlands, their characteristics, and functions for areas where NWI+ data are available.

The website also provides links to other federal and state websites that contain information on wetlands and geospatial wetland data.  Among the national datasets accessible via Wetlands One-Stop Mapping are the NWI’s wetlands mapper, USDA’s web soil survey, USGS’s national hydrography data and hydrologic units (HUCs).  Links are also provided to NatureServe Explorer and the U.S. National Vegetation Classification Hierarchy Explorer along with guidance on how to extract descriptions of wetland plant communities from those sites for specific areas of interest.

Wetlands One-Stop Mapping Links by Subject



National Wetlands Inventory (NWI)

FWS Wetlands Mapper

Wetland Primer

Federal Standards & Funding for Wetland Mapping

National Data Sets & Information


NWI+ Data & Information

LLWW Classification

NWI+ Data Layers

NWI+ Mapper

NWI+ Reports



State Wetland Mapping Summaries

State Wetland Program Websites & Data


Wetland Mapping Training

Reports and Publications

Reports & Publications

Other Mapping & Wetland Resources

Other Resources

Wetland Plant Community Information

Wetland Mapping Consortium

Wetland Classification Image Gallery


What is NWI+?

NWI+ was a regional initiative by the Northeast Region of the U.S.  NWI+
Fish and Wildlife Service's NWI Program.  It was supported by the NWI through regional mapping projects funded by the U.S. Fish and Wildlife Service and federal and state cooperators from the mid-1990s to 2015.  It began as a regional demonstration initiative in how NWI data could be enhanced with hydrogeomorphic attributes for landscape position, landform, water flow path, and waterbody type (LLWW descriptors) to increase the functionality of NWI data for better characterizing wetlands, for predicting wetland functions at the landscape or watershed level, and for assessing the impact of wetland changes on wetland functions.  The expanded database and its outputs were called NWI+ data as the results go beyond the standard NWI mapping.  Production of NWI+ data was a special project of the NWI with work mostly in the Northeast Region but also undertaken by some states (e.g., Colorado, Georgia, Montana, and New Mexico) in other Regions when they were updating NWI data.  While the demonstration was successful and NWI+ or similar data continue to be generated by several states, the national NWI Program (the U.S. Fish and Wildlife Service) is no longer able to support NWI+ initiatives.  Moreover budget cuts for the program have made the NWI+ NWI more dependent than ever on having cooperators update even the basic NWI database.