The official floodplain is typically shown through a FEMA Flood Insurance Rate Map (FIRM). This map delineates the special flood hazard areas, or flood zones. These flood zones determine how a community will regulate development in the floodplain and where flood insurance will be required when getting a federally backed mortgage.
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.
Access Flood Maps
Information on the map update process and timelines for updating map data.
FEMA has established administrative procedures for changing or challenging effective FIRMs based on new or revised technical data.
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.
To view and download stream segment model information, visit the Hydraulic Model.
Technical information and forms often used by engineers, surveyors and floodplain managers.