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Wetlands – NWI Update – Circular 39

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MN Dept. of Natural Resources
Currently Being Updated
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The National Wetlands Inventory (NWI), originally developed for Minnesota during the 1980s, is being updated. 2011 spring imagery, LiDAR elevation data, and other ancillary data are being used to identify wetlands. Updates are available for the northeast, east-central, and southern parts of the state. These data are intended to replace the original NWI. The Circular 39 system divides wetlands predominantly based on depth and vegetation. Wetlands are highly valued for their ecological contributions They provide habitat for a variety of plants and animals and improve water quality. Minnesota's wetlands are also legally protected - any loss of wetlands in the state must be mitigated through an associated restoration project.

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