Floodplain Maps and Technical Resources
Access Flood Maps
Landowners should work with their local government to access the best available flood maps for their area. If your property is within a city, contact the city. For property owners outside of city boundaries, contact the county.
- FEMA Map Service Center - View Digital Flood Insurance Rate Maps (DFIRMs) for modernized counties and paper maps for unmodernized counties, as well as Flood Insurance Studies.
- Paper Maps and Flood Insurance Studies (tutorial )
- FEMA's National Flood Hazard Layer Viewer - View Digital Flood Insurance Rate Maps (DFIRMs) for modernized counties updated since 2003.
- Digital Flood Insurance Rate Maps (tutorial )
- Minnesota Geospatial Commons - For GIS users. Dataset contains effective floodplain data for all mapped flood areas. Estimated 1% Water Surface Elevations layer is available and provides model-based elevations for many effective A-Zones or areas that are not yet mapped.
- DNR Floodplain Program FTP Site - Contains preliminary and effective floodplain data for all counties that have had map updates since 2003.
FEMA Map Updates
Information on the map update process and timelines for updating map data.
Map Appeals and Amendments
FEMA has established administrative procedures for changing or challenging effective FIRMs based on new or revised technical data.
Base Flood Elevations
Base flood elevations are also known as the 1% annual chance flood elevation or 100-year flood elevation. These elevations can be determined in different ways depending on the source of the floodplain map and zone of the site.
Hydraulic Model Download Viewer
To view and download stream segment model information, visit the Hydraulic Model.
Technical Resources for Floodplain Development
Technical information and forms often used by engineers, surveyors and floodplain managers.