Wisconsin faces flood risk from the Mississippi, Wisconsin, Fox, Rock, and Chippewa rivers, as well as urban flash flooding in the Milwaukee and Madison metro areas. The 2008 and 2018 flooding along the Mississippi River caused hundreds of millions in damage to communities in southwestern Wisconsin. La Crosse, Prairie du Chien, and other Mississippi River towns have long flood histories. The Fox River valley through Appleton, Oshkosh, and Green Bay faces regular riverine flooding. Milwaukee has experienced significant urban flash flooding events, including the August 2018 flood that caused over $100 million in damage when over 7 inches of rain fell in a few hours. The Rock River and its tributaries flood through Janesville and Beloit. The Wisconsin Dells area along the Wisconsin River faces both riverine and flash flood risk. The state has over 600 NFIP-participating communities and has invested in flood mitigation through the Wisconsin Department of Natural Resources. Northern Wisconsin communities along the Chippewa and Flambeau rivers also experience regular flooding during spring snowmelt. Climate projections suggest Wisconsin's flood risk will increase with more intense rainfall events and earlier spring snowmelt.
Wisconsin Flood Zones
FEMA Flood Zone Lookup in Wisconsin
Look up any address in Wisconsin to find its FEMA flood zone designation, insurance requirements, and base flood elevation — sourced from the official National Flood Hazard Layer.
Zone A and Zone AE along the Mississippi, Wisconsin, Fox, Rock, and Chippewa rivers; Zone X (shaded) for moderate-risk areas in Milwaukee, Madison, and Green Bay; Zone AO for shallow flooding in agricultural lowlands; Zone AR for levee-protected areas along the Mississippi.
Milwaukee County, Dane County, La Crosse County, Outagamie County, Rock County
NFIP premiums typically range $400-$900 for standard-risk properties. Mississippi River properties in La Crosse and Prairie du Chien can run $1,200-$3,000 annually. Milwaukee urban flood zone properties face moderate premiums of $600-$1,500.
Frequently Asked Questions — Wisconsin
Does Milwaukee flood?
Yes. Milwaukee has experienced significant urban flash flooding, including the devastating August 2018 flood that caused over $100 million in damage when over 7 inches of rain fell in hours. The city's stormwater system is being upgraded to handle more intense rainfall events.
How bad is Mississippi River flooding in Wisconsin?
The 2008 and 2018 Mississippi River floods caused hundreds of millions in damage to southwestern Wisconsin communities. La Crosse, Prairie du Chien, and other river towns have experienced repeated flooding and have invested in flood protection infrastructure.
Do I need flood insurance in Wisconsin?
If you are in a designated flood zone with a federally backed mortgage, yes. Wisconsin faces both riverine and urban flash flood risk. About 25% of NFIP claims come from outside high-risk zones across the state.
Disclaimer: FloodZoneCheck is a free research tool using public FEMA data, not an official Standard Flood Hazard Determination. Lenders require a certified determination from a licensed provider. Zone boundaries can cross a single parcel — confirm exact risk and insurance requirements with FEMA or your insurer before relying on this for a purchase or insurance decision.
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