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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. .
 Maps may be viewed on the FWS/NWI Mapper​ web site.
FWS National Wetlands Inventory Center
National Wetlands Inventory Fact Sheet 
Wetlands Inventory User's Guide