Wisconsin inland flooding risk
Milwaukee County has the highest inland flooding risk in Wisconsin, scoring 97 out of 100 — rated "Relatively High" by FEMA's National Risk Index. Recorded inland flooding events across Wisconsin have decreased 61% over the past five years compared to the prior five-year period.
| # | County | NRI score | Rating |
NOAA events 2016–2026 |
|---|---|---|---|---|
| 1 | Milwaukee County | 97 | Relatively High | 27 |
| 2 | Dane County | 94.3 | Relatively High | 26 |
| 3 | Brown County | 91.9 | Relatively Moderate | 13 |
| 4 | Waukesha County | 89.8 | Relatively Moderate | 16 |
| 5 | Winnebago County | 89.3 | Relatively Moderate | 3 |
| 6 | Marathon County | 87.7 | Relatively Moderate | 6 |
| 7 | Rock County | 87.6 | Relatively Moderate | 43 |
| 8 | Racine County | 85.7 | Relatively Moderate | 15 |
| 9 | Eau Claire County | 79.9 | Relatively Moderate | 6 |
| 10 | Jefferson County | 79.5 | Relatively Moderate | 28 |
| 11 | Monroe County | 78.4 | Relatively Moderate | 19 |
| 12 | Wood County | 77.7 | Relatively Moderate | 6 |
| 13 | Sauk County | 77.5 | Relatively Moderate | 26 |
| 14 | Outagamie County | 77.1 | Relatively Moderate | 4 |
| 15 | Kenosha County | 76.6 | Relatively Moderate | 23 |
| 16 | Columbia County | 75.6 | Relatively Moderate | 41 |
| 17 | Fond du Lac County | 74.3 | Relatively Moderate | 12 |
| 18 | La Crosse County | 74 | Relatively Moderate | 43 |
| 19 | Walworth County | 73.2 | Relatively Moderate | 10 |
| 20 | Marinette County | 72.7 | Relatively Low | 2 |
| 21 | Adams County | 72.5 | Relatively Low | 14 |
| 22 | Sheboygan County | 71.8 | Relatively Low | 12 |
| 23 | Chippewa County | 71 | Relatively Low | 8 |
| 24 | Juneau County | 70.7 | Relatively Low | 34 |
| 25 | Vernon County | 70.2 | Relatively Low | 68 |
| 26 | Manitowoc County | 69.7 | Relatively Low | 6 |
| 27 | Clark County | 69.1 | Relatively Low | 17 |
| 28 | Oconto County | 68.8 | Relatively Low | 16 |
| 29 | Dodge County | 68 | Relatively Low | 17 |
| 30 | Trempealeau County | 67.5 | Relatively Low | 63 |
| 31 | Portage County | 66.8 | Relatively Low | 4 |
| 32 | Waupaca County | 66.3 | Relatively Low | 5 |
| 33 | Washington County | 66.1 | Relatively Low | 8 |
| 34 | St. Croix County | 64.1 | Relatively Low | 2 |
| 35 | Richland County | 62.9 | Relatively Low | 12 |
| 36 | Green Lake County | 62.3 | Relatively Low | 7 |
| 37 | Grant County | 62.2 | Relatively Low | 67 |
| 38 | Sawyer County | 62.1 | Relatively Low | 17 |
| 39 | Douglas County | 61.5 | Relatively Low | 14 |
| 40 | Oneida County | 61.1 | Relatively Low | 1 |
| 41 | Vilas County | 60.9 | Relatively Low | 1 |
| 42 | Shawano County | 59.7 | Relatively Low | 2 |
| 43 | Barron County | 59.1 | Relatively Low | 0 |
| 44 | Ozaukee County | 58.3 | Relatively Low | 21 |
| 45 | Lincoln County | 56.2 | Relatively Low | 2 |
| 46 | Crawford County | 56.1 | Relatively Low | 64 |
| 47 | Burnett County | 55.5 | Relatively Low | 8 |
| 48 | Polk County | 55.2 | Relatively Low | 1 |
| 49 | Jackson County | 54.7 | Relatively Low | 38 |
| 50 | Door County | 52.1 | Relatively Low | 1 |
| 51 | Dunn County | 50.2 | Relatively Low | 3 |
| 52 | Pierce County | 48.7 | Relatively Low | 2 |
| 53 | Waushara County | 44.9 | Relatively Low | 5 |
| 54 | Rusk County | 44.7 | Relatively Low | 1 |
| 55 | Green County | 44.4 | Relatively Low | 18 |
| 56 | Marquette County | 43.5 | Relatively Low | 5 |
| 57 | Taylor County | 42.5 | Relatively Low | 2 |
| 58 | Langlade County | 39.2 | Relatively Low | 2 |
| 59 | Price County | 38.7 | Relatively Low | 14 |
| 60 | Bayfield County | 33.5 | Very Low | 32 |
| 61 | Calumet County | 33.1 | Very Low | 8 |
| 62 | Washburn County | 32.5 | Very Low | 10 |
| 63 | Iowa County | 31.7 | Very Low | 8 |
| 64 | Ashland County | 28.2 | Very Low | 14 |
| 65 | Lafayette County | 27.3 | Very Low | 23 |
| 66 | Buffalo County | 24.6 | Very Low | 16 |
| 67 | Kewaunee County | 24.4 | Very Low | 15 |
| 68 | Forest County | 20.7 | Very Low | 0 |
| 69 | Iron County | 18.4 | Very Low | 3 |
| 70 | Pepin County | 16.2 | Very Low | 3 |
| 71 | Florence County | 11 | Very Low | 0 |
| 72 | Menominee County | 7.4 | Very Low | 1 |
Source: FEMA National Risk Index v1.20.0, December 2025. Scores are 0–100 percentile rankings among all US counties. See the methodology page for definitions. Download the full CSV for all counties.
Inland Flooding risk nationally:
Other hazard risks in Wisconsin:
Frequently asked questions
What is the highest inland flooding risk county in Wisconsin?
Milwaukee County, WI has the highest inland flooding risk in Wisconsin, with a FEMA National Risk Index score of 97 out of 100 (rated "Relatively High").
What causes inland flooding risk in Wisconsin?
Inland flooding covers riverine and surface (pluvial) flooding — the most common and costly natural disaster type in the US. High scores appear across river floodplains in the Midwest, South, and Mid-Atlantic, where legacy development in flood-prone areas and aging stormwater infrastructure concentrate risk.