National Wetlands Inventory
Ecological Services


Over 32 million acres of the lower 48 states have new wetlands data posted to the Wetlands Mapper.  This includes large portions of Minnesota, Wisconsin and Colorado and areas in Montana, New York, New Hampshire, Vermont and Michigan.  To view these updates, please visit our Wetlands Mapper webpage.

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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Wetlands Mapper

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Wetland Codes

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Google Earth

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Download Data

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Status and Trends

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Web Map Services

Latest News and Reports

Updated Data Collection Procedures
The Data Collection Requirements and Procedures document has been updated to include digital mapping conventions related to Cowardin 2.0 (adopted by the FGDC in 2013), instructions on the NWI QA/QC Tool for Arc 10.x, the NWI Map Code Diagram and the NWI Water Regime Restriction Table sorted by sub-class. To download the updated document click here.

New Wetlands Data added to the Mapper - October 2015
Over 65 million acres of new wetlands data has been posted to the Wetlands Mapper. These updates include portions of the lower 48 states as well as Alaska and Hawaii. To view these updates, please visit our Wetlands Mapper webpage.

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 in 2016!
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

Last updated: October 2, 2015