Resources for accessing flood maps and supporting data.
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 Download Application for availability.
Technical information and forms often used by engineers, surveyors and floodplain managers such as elevation certificates, no-rise certificates, floodproofing and retrofitting of new and existing structures, bridge and culvert design considerations, datum considerations, and Letter of Map Revisions (LOMR).