Floodplain Mapping

FEMA’s interactive Map Service Center can be used to view the currently effective Flood Insurance Rate Map (FIRM), Flood Insurance Study (FIS), and any Letters of Map Change (LOMC). 


Request a change to the Flood Insurance Rate Map (FIRM).

A property owner may request a change by submitting Letter of Map Change (LOMC) documentation to FEMA. Reasons to submississippi fpmit a LOMC request include:

  • The property is at a higher elevation than the Base Flood Elevation (BFE) on the FIRM
  • The property has been re-graded or elevated with fill.
  • More accurate information than shown on the FIRM is available.


The City of Charleston GIS portal includes resources such as:  

  • Currently effective and preliminary Flood Insurance Rate Maps (FIRM)
  • Tide trends and projected tides ("Tide Eye")
  • Sea Level Rise (SLR) viewer

Stream Gauges and Stream-flow Data:



Image: Historic geologic map of the Mississippi River floodplain,
produced by the United States Army Corps of Engineers
Source: LSU Law Center:  Climate Change Law & Policy Project

Local Sea Level Rise (SLR) Projections: