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National Wetlands Inventory
Siletz River National Wildlife Refuge
Siletz River National Wildlife Refuge, photo Jill Burnett
The National Wetlands Inventory (NWI) was developed by the U.S. Fish and Wildlife Service (FWS) and is available statewide.
Wetlands and deepwater habitats (streams, lakes, estuaries, etc.) are mapped on a USGS quad map base; most are at a scale of 1:24,000.
Only those wetlands and other waters that are visible on high altitude aerial photographs are mapped, and most maps date to the mid-1980s.
There are 1,865 maps for Oregon. Some areas have been digitized and digital information is available through the FWS.
The Department is the State Distribution Center for NWI maps. The Department maintains a complete collection of NWI maps for Oregon.
Maps may be viewed at the Department office in Salem or ordered from the Department. Maps that have been digitized may also be viewed on the FWS/NWI web site.
FWS National Wetlands Inventory Center
National Wetlands Inventory Fact Sheet 
Order NWI Maps
Wetlands Inventory User's Guide