The following counties have data and/or viewers available, in addition to the official FEMA maps on FEMA's Maps Service Center (link is external).
- Anoka County
- County Supported Map Viewer — includes features to help with Letter of Map Amendment applications
- Blue Earth County
- Preliminary New FEMA Map (as of Aug. 28, 2020)
- Carlton County
- Preliminary New FEMA Map (as of May 28, 2021)
- Chippewa County
- Preliminary New FEMA Map (as of Dec. 20, 2022)
- Chippewa Work Map Viewer
Dodge County
Preliminary New FEMA Map (as of Feb. 15, 2022)
- Goodhue County (part of county)
- Preliminary New FEMA Map (as of Feb. 10, 2020)
- Hennepin County
- County Supported Map Viewer using interactive natural resources map — includes floodplain layers in water layers and 2-foot elevation contours in land layers
- Itasca County
- Preliminary New FEMA Map (as of July 30, 2021)
- Le Sueur County
- Preliminary New FEMA Map (as of July 14, 2022)
Lincoln County
Pending New FEMA Map (will be effective Sept. 7, 2023)
- Morrison County
- Preliminary New FEMA Map (as of Nov. 3, 2022)
- Morrison Work Map Viewer
- Olmsted County (part of county)
- Pending New FEMA Map (will be effective Sept. 21, 2023)
- Preliminary New FEMA Map (as of May 29, 2020)
- Pipestone County
- Preliminary New FEMA Map (as of Aug. 26, 2022)
- Polk County
- Preliminary New FEMA Map (as of July 4, 2014)
- Pope County
- Preliminary New FEMA Map (as of Nov. 23, 2022)
- Rock County
- Preliminary New FEMA Map (as of Aug. 26, 2022)
- Stevens County
- Preliminary New FEMA Map (as of Feb. 28, 2023)
- Watonwan County
- Preliminary New FEMA Map (as of Oct. 29, 2021)
- Winona County
- Wright County
- Preliminary New FEMA Map (as of April 29, 2022)
Pending New FEMA Maps
FEMA maps move from preliminary to pending six month prior to becoming effective. These maps are available on FEMA's interactive Flood Map Changes Viewer. Once a map is effective, it will be on FEMA's Map Service Center and not on the Flood Map Changes Viewer.
Preliminary New FEMA Maps
Preliminary new FEMA maps show the latest data. These maps are not official for insurance determinations.
- A Zone data can be used as "best available data" for local permit decisions or for FEMA map appeals and amendments.
- Zones AE, A1-30, AO and AH data on current effective maps continue to be official until new effective maps are issued. If preliminary new map data are more restrictive, communities are strongly encouraged to use the more restrictive data.
County Work Maps
An interactive map to see floodplain data that is not on official effective maps (which would be used for flood insurance determinations), but that can often be used as "best available data" for local permit decisions or for FEMA map appeals and amendments.
Changes Since Last Flood (CSLF) Insurance Rate Map Viewers
Interactive map comparing the floodway and floodplain area on current effective maps versus what is mapped on new county work maps or preliminary new maps. The CSLF shows areas newly identified at high risk, areas previously mapped that continue to be identified at high risk, and areas currently shown at high risk that are not at high risk based on more accurate data.
Depth Grid Maps
Depth Grid Maps show the depth of flooding for a specific storm event, usually the 1percent chance (or 100-year) storm event. The depth grids can help better understand flood risk (such as, the deeper the flooding, the higher the risk if flooded). The depth grids can also help communities determine flood mitigation options, like homes in deeper areas could be considered for buy-out, while homes in shallow areas could be flood proofed.
Percent-Annual-Chance Maps
The Percent-Annual-Chance Map shows the percent chance of flooding during any given year. For example, a structure at the edge of the "100-year floodplain" has a 1 percent chance of flooding during any given year. Structures outside the 100-year floodplain may not be in the "regulatory" floodplain and may not be required to buy flood insurance, but they still have a 0.2 percent chance of flooding during any given year. These maps help residents understand that their level of risk isn't captured by looking only at the Flood Insurance Rate Map.
County Supported Map Viewers
Many counties have floodplain data shown in interactive maps on county sites. Each county shows the floodplain data in a different manner, but they typically allow lot lines and other county data to be viewed or viewed with links.