Welcome to the Dane County Floodplain Website

Floodplain Zoning

Under state and federal law, all communities that participate in the National Flood Insurance Program must adopt floodplain zoning ordinances to limit development in flood-prone areas. Dane County's floodplain zoning ordinance (Chapter 17, Dane County Code) applies within areas determined to have at least a 1% chance of flooding in any given year.

Floodplain Mapping

Areas below the Regional Flood Elevation are shown on the county's floodplain zoning maps, as adopted by the county board. In most cases, the official floodplain zoning maps are the same Flood Insurance Rate Maps (FIRM) used by insurance companies to determine eligibility for the National Flood Insurance Program. FIRM maps are produced by the Federal Emergency Management Agency. For Dane County, the FIRM maps were last updated and adopted in 2009. FIRM data is available countywide on DCIMap, under the "Land Use and Zoning" tab specifically the:

  1. FEMA FIRM Panel
  2. Floodway Areas in Zone AE
  3. 1 Percent Annual Flood Chance Area.

PDF-format versions of the current, adopted FIRM maps are also available online.

January 2, 2009 Adopted FIRM Maps:

Below are online copies of all available Final FIRM maps for Dane County in Acrobat PDF format. Some of these files are quite large (17 MB). Depending on the speed of your internet connection, they may take as long as 15 minutes or more to download. You will probably get the best results if you right-mouse-click and select "save target as," then save the file to your hard drive. The Flood Insurance Study provides detailed information about how these maps were created.

As more detailed and more accurate floodplain data becomes available, the county board may adopt other official maps to supplement the FEMA FIRM maps. A complete list of all adopted floodplain maps is included in Section 17.05(2), Dane County Code.

If you have reason to believe that the final maps do not accurately reflect flood conditions on your property, you have the following option:

  • If you do not already have a Letter of Map Amendment, you may apply for one directly from FEMA

For incorporated cities and villages, contact your local floodplain zoning agency for more information. (see the County Clerk's website for contact information) or at:

Other Resources

If you have additional questions that cannot be answered from the online resources above, contact us at:

Dane County Department of Planning & Development
ATTN: Floodplain Mapping Updates
Room 116, City County Building
Madison, WI 53703
(608) 267-4115

Date Revised: 1/14/10 Planning & Development