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interactive floodplain maps.
the mapping process.
about regulating floodplains.
floodplain and dam customer assistance.
Contact information
For floodplain policy, zoning contact:
DNR Floodplains

Floodplain engineering data

The DNR engineering group does engineering studies as contractors under FEMA’s Risk MAP program. The studies are used to produce the Flood Insurance Studies and the Digital Flood Insurance Rate Maps.

The engineering data from the Flood Insurance Studies can be found on the department Surface Water Data Viewer. If the effective model is not on the Surface Water Data Viewer, then staff can assist users in determining whether or not engineering data exists.

Staff can answer specific technical questions on studies related to the floodplain. For most engineering hydraulic studies, HEC-RAS is the accepted model. A free copy of HEC-RAS can be downloaded from the US Army Corps of Engineers [exit DNR].

Staff reviews and approves engineering studies for compliance with NR 116 Wis. Admin. Code.

Users should contact the FEMA Map Information Exchange at 1-877-336-2627 for questions related to Letter of Map Change submittals.


More information on floodplain management.

Last Revised: Monday November 09 2015