National Wetland Inventory for Minnesota

National Wetland Inventory (NWI) data for Minnesota provide information on the location, extent, and type of Minnesota wetlands. Natural resource managers use NWI data to improve the management, protection, and restoration of wetlands. Wetlands provide many ecological benefits including habitat for fish and wildlife, reducing floods, recharging, improving water quality, and supporting recreation.<br/><br/>These data were updated through a decade-long, multi-agency collaborative effort under leadership of the Minnesota Department of Natural Resources (MNDNR). Major funding was provided by the Environmental and Natural Resources Trust Fund. <br/><br/>This is the first statewide update of the NWI for Minnesota since the original inventory in the mid-1980s. The work was completed in phases by dividing the state into five project areas. Those project areas have all been edgematched into a final seamless statewide dataset. <br/><br/>Ducks Unlimited (Ann Arbor, MI) and St. Mary’s University Geospatial Services (Winona, MN) conducted the wetland mapping and classification under contract to the MNDNR. The Remote Sensing and Geospatial Analysis Laboratory at the University of Minnesota provided support for methods development and field validation. The DNR Resource Assessment Office provided additional support for data processing, field checking, and quality control review. <br/><br/>The updated NWI data delineate and classify wetlands according to the system developed by Cowardin et al. (1979), which is consistent with the original NWI. The updated data also contain a simplified plant community classification (SPCC) and a simplified hydrogeomorphic (HGM) classification. Quality assurance of the data included visual inspection, automated checks for attribute validity and topologic consistency, as well as a formal accuracy assessment based on an independent field verified data set. Further details on the methods employed can be found in the technical procedures document for this project located on the project website ( ). <br/><br/><b>DOWNLOAD NOTE:</b> The size of the NWI dataset exceed the limits for the Shapefile format. We recommend that you use the ESRI File Geodatabase format instead. We are currently working on an alternative. If you are unable to use the file geodatabase while we determine the best alternate delivery format, you can view data through Wetland Finder, an interactive mapping application on the DNR’s website ( ). <br/><br/><b>SYMBOLOGY NOTE:</b> The ESRI File Geodatabase download includes four layer files that symbolize the data using four different wetland classification systems. The symbology layer files for the Cowardin class and the simplified HGM class are grouped into a smaller number of classes than the full elaborated classifications. Detail is available in the Minnesota Wetland Inventory User Guide and Summary Statistics report ( ). The layer files for these data have been set up to restrict drawing of the data when zoomed out beyond 1:250,000 scale. This is, in part, to prevent problems with slow performance with this large dataset.

Additional Info

Field Value
Last Updated June 14, 2019, 10:03
Created July 29, 2014, 15:04
dsAccessConst None
dsCurrentRef These data correspond to the ground conditions at the time of the base imagery acquisition (2009 – 2014). Time Period of Content Date indicates when dataset was last updated.
dsModifiedDate 2019-06-14 01:32:36
dsOriginator Minnesota Department of Natural Resources
dsPeriodOfContent 5/23/2019
dsPurpose NWI data support effective wetland management, protection, and restoration. The data provide a baseline for assessing the effectiveness of wetland policies and management actions. These data are used at all levels of government, as well as by private industry and non-profit organizations for wetland regulation and management, land use and conservation planning, environmental impact assessment, and natural resource inventories.

Dataset extent