National Wetlands Inventory
Ecological Services

Wetlands provide a multitude of ecological, economic and social benefits. They provide habitat for fish, wildlife and a variety of plants. Wetlands are nurseries for many saltwater and freshwater fishes and shellfish of commercial and recreational importance. Wetlands are also important landscape features because they hold and slowly release flood water and snow melt, recharge groundwater, recycle nutrients, and provide recreation and wildlife viewing opportunities for millions of people.

The Wetlands Mapper integrates digital map data with other resource information to produce timely and relevant management and decision support tools.  Data can also be downloaded by HUC 8 Watershed Boundary or by State. 

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Latest News and Reports

Watershed Downloads Now Available
'Download by Watershed' capability is now implemented in the Wetlands Mapper. By using the Tools menu, users can interactively select HUC8 Watersheds to download wetlands and wetlands related layers for that area. For more information visit our data download page at:

Status and Trends of Prairie Wetlands Report Released
The Status and Trends of Prairie Wetlands in the United States 1997 to 2009 was released on June 30, 2014. This report estimates that 6,427,350 acres of wetlands remained in the Prairie Pothole Region in 2009, which represents 5.8% of the total wetland area found in the conterminous U.S. in 2009. Between 1997 and 2009, the average annual rate of change was an estimated loss of 6,200 acres and an estimated 40% of emergent wetland area was lost or converted to deepwater lake systems or open-water ponds. Click here to download the report (17MB PDF); News Release (PDF); Questions and Answers ((6MB PDF); Fact Sheet (PDF).

Surface Waters and Wetlands Inventory – Coming Soon!
Often referred to as Version 2.0 of the National Wetlands Inventory, the Surface Waters and Wetlands Inventory provides more inclusive geospatial data of all wetlands and surface water features. This national geospatial data product will contribute substantially to improved modeling of flow and water movement in surface water basins, channels, and wetlands.  For more information visit the SWI Product Summary web page

Wetlands Digital Data Completed for the Conterminous 48 States
May is American Wetlands Month, a time to celebrate and recognize how they enrich our lives and contribute to the health of our environment. In a fitting tribute to wetlands, the U.S. Fish and Wildlife Service’s National Wetlands Inventory is announcing the completion of the digital wetland coverage for the conterminous 48 States, Hawaii, Puerto Rico, the Virgin Islands, Guam, the major Northern Mariana Islands and 35 % of Alaska. This digital wetlands data can viewed on the Wetlands Mapper, is available for download and via web map services. View the News Release (PDF).

Last updated: January 21, 2015