The Federal Emergency Management Agency is the federal agency ultimately responsible for flood hazard mapping in the United States. While the Wisconsin Department of Natural Resources acts as a technical contractor for the mapping in Wisconsin, all data are distributed by FEMA.
FEMA provides a number of options for consuming flood hazard data, including interactive mapping applications, GIS web services (ArcGIS REST, WMS, WFS) and downloadable data.
- How to use FEMA Floodplain Map Services
- FTP: Seamless nationwide flood hazard data – very large nationwide files!