|Date(s):||Coverage Availability/Geographic Extent:||Footprint:||Source(s):|
|1979-2015||Statewide coverage||USGS 100k Grid||U.S. Fish and Wildlife Service|
Use our online data search & download to specify the geographic area for which you would like to download this data set.
|Known Issues:||Age, Most not updated since 1980s|
|Recommended Uses:||Basemap, Research|
This data set represents the extent, approximate location and type of wetlands and deepwater habitats in the United States and its Territories. These data delineate the areal extent of wetlands and surface waters as defined by Cowardin et al. (1979).
Certain wetland habitats are excluded from the National mapping program because of the limitations of aerial imagery as the primary data source used to detect wetlands. These habitats include seagrasses or submerged aquatic vegetation that are found in the intertidal and subtidal zones of estuaries and near shore coastal waters. Some deepwater reef communities (coral or tuberficid worm reefs) have also been excluded from the inventory. These habitats, because of their depth, go undetected by aerial imagery. By policy, the Service also excludes certain types of "farmed wetlands" as may be defined by the Food Security Act or that do not coincide with the Cowardin et al. definition.
Contact the Service's Regional Wetland Coordinator for additional information on what types of farmed wetlands are included on wetland maps.