The National Wetland Inventory (NWI) from 2005 was produced by Great Lakes/Atlantic Region Office (GLARO) of Ducks Unlimited with funding provided by EGLE. The NWI 2005 was an update to the original 1978 NWI Layer produced by US Fish and Wildlife Service, and utilized 1998 and 2005 imagery to map wetland loss/change over time. Classification of wetlands is based on the Cowardin Wetland Classification system with a minimum mapping unit of 1/10 acre. The NWI+ data includes hydrogeomorphic classification of wetlands in addition to the normal Cowardin wetland classification, and includes functional assessment information of each wetland in the attribution.The full report on this dataset is available by request to the Wetlands, Lakes, and Streams Unit.
Michigan Dept. of Environment, Great Lakes, and Energy