Floodplain Information

Helpful links for information regarding living in or near a floodplain


Wisconsin DNR Living in a Flood Plain and Letter of Map Amendment Information


Ozaukee County Flood Plain Insurance Study and Floodplain map index


FEMA Letter of Map Amendment & Letter of Map Revision-Based on Fill Process


A LOMA (Letter Of Map Amendment) is typically a correction to a flood map and is issued based on better survey data showing that a property’s natural lowest grade is above BFE (base flood elevation). A property owner will often request a LOMA after being informed by a lending institution that the property is believed to be within a SFHA (special flood hazard area). FEMA does not charge a fee for reviewing applications for a LOMA. 


Thiensville Interactive Map


WIDNR Flood Prevention Steps