A Letter of Map Revision (LOMR) is FEMA's modification to an effective Flood Insurance Rate Map (FIRM). LOMRs are generally based on better topographic, modeling, or physical structures that affect the hydrologic or hydraulic characteristics of a flooding source and thus result in the modification of the effective Base Flood Elevations (BFEs), the Special Flood Hazard Area (the 100-year floodplain), and sometimes the Flood Insurance Study (FIS) report. The LOMR officially revises the Flood Insurance Rate Map (FIRM).
Currently, there are three LOMRs being processed by FEMA:
As a public service, Howard County Government provides residents with the following floodplain information upon request based on the Federal Emergency Management Agency’s (FEMA’s) effective Flood Insurance Rate Map (FIRM):
In order to obtain floodplain information, you can contact the Stormwater Management Division by e-mail at DoIFlood@