USFWS National Wetlands Inventory - Seamless Data Download
US Fish & Wildlife Service National Wetlands Inventory: 37+ million wetland and deepwater features for the US and territories, downloadable by HUC8 watershed or state in geodatabase, shapefile or GeoPackage.
fws.gov
At a glance
- Region
- United States (North America)
- Coverage
- United States and territories
- Access
- Free
- Category
- Government
- Last updated
- 2026
What's inside
- wetland inventory
What you can do with it
Typical work that data of this type supports.
- 01
Storage tracking
Follow storage and releases through the season.
Because it has: wetland inventory
- 02
Change over time
See how lakes and wetlands have grown or shrunk.
- 03
Operations
Support release and supply decisions.
Where AI adds value
Ideas for machine learning and AI agents built on this kind of data.
- 01
Storage from space
Estimate volume from satellite water area and altimetry.
- 02
Release decisions
Optimise releases against inflow forecasts.
- 03
Shrinkage alerts
Detect water bodies that are drying or being encroached.
Machine access and documentation
Open API
Wetlands Mapper also exposes ArcGIS REST map/feature services
Licence: Open data
Listed in our registry of open water APIs, which WaterDataGPT can query live.
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- AgWeatherNet (Washington State University)North America | Free
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