Riverine Flood Risk in Wisconsin
All Wisconsin counties ranked by FEMA National Risk Index riverine flood score
Riverine Flood risk — rivers and streams overflowing their banks after heavy rain or snowmelt — is rated for 72 of 72 Wisconsin counties in FEMA's National Risk Index. Milwaukee County carries the state's highest riverine flood score at 97.0, with $101M in expected annual riverine flood losses.
2 Wisconsin counties are rated High or Very High for riverine flood, and expected annual losses from riverine flood total roughly $1.12B statewide. The full ranking below links to each county's complete 18-hazard risk profile.
County Rankings — Riverine Flood
| # | County | Riverine Flood Score | Rating | Ann. Freq. | Ann. Loss |
|---|---|---|---|---|---|
| 1 | Milwaukee County | High | 2.11 / yr | $101M | |
| 2 | Dane County | High | 2.07 / yr | $84M | |
| 3 | Brown County | Medium | 1.11 / yr | $57M | |
| 4 | Waukesha County | Medium | 1.75 / yr | $68M | |
| 5 | Winnebago County | Medium | 0.57 / yr | $43M | |
| 6 | Marathon County | Medium | 0.79 / yr | $36M | |
| 7 | Rock County | Medium | 2.11 / yr | $38M | |
| 8 | Racine County | Medium | 1.64 / yr | $30M | |
| 9 | Eau Claire County | Medium | 0.64 / yr | $24M | |
| 10 | Jefferson County | Medium | 1.57 / yr | $23M | |
| 11 | Monroe County | Medium | 0.71 / yr | $14M | |
| 12 | Wood County | Medium | 0.71 / yr | $20M | |
| 13 | Sauk County | Medium | 1.79 / yr | $20M | |
| 14 | Outagamie County | Medium | 0.64 / yr | $25M | |
| 15 | Kenosha County | Medium | 2.00 / yr | $20M | |
| 16 | Columbia County | Medium | 1.96 / yr | $19M | |
| 17 | Fond du Lac County | Medium | 0.64 / yr | $19M | |
| 18 | La Crosse County | Medium | 2.32 / yr | $19M | |
| 19 | Walworth County | Medium | 0.93 / yr | $18M | |
| 20 | Marinette County | Low | 0.71 / yr | $14M | |
| 21 | Adams County | Low | 0.54 / yr | $10M | |
| 22 | Sheboygan County | Low | 0.96 / yr | $18M | |
| 23 | Chippewa County | Low | 0.75 / yr | $16M | |
| 24 | Juneau County | Low | 1.14 / yr | $11M | |
| 25 | Vernon County | Low | 2.61 / yr | $10M | |
| 26 | Manitowoc County | Low | 0.75 / yr | $15M | |
| 27 | Clark County | Low | 0.82 / yr | $8M | |
| 28 | Oconto County | Low | 1.00 / yr | $13M | |
| 29 | Dodge County | Low | 0.93 / yr | $14M | |
| 30 | Trempealeau County | Low | 2.82 / yr | $12M | |
| 31 | Portage County | Low | 0.46 / yr | $18M | |
| 32 | Waupaca County | Low | 0.36 / yr | $10M | |
| 33 | Washington County | Low | 0.61 / yr | $20M | |
| 34 | St. Croix County | Low | 0.46 / yr | $16M | |
| 35 | Richland County | Low | 1.21 / yr | $8M | |
| 36 | Green Lake County | Low | 0.46 / yr | $7M | |
| 37 | Grant County | Low | 2.64 / yr | $9M | |
| 38 | Sawyer County | Low | 0.39 / yr | $7M | |
| 39 | Douglas County | Low | 0.54 / yr | $11M | |
| 40 | Oneida County | Low | 0.36 / yr | $10M | |
| 41 | Vilas County | Low | 0.25 / yr | $7M | |
| 42 | Shawano County | Low | 0.29 / yr | $10M | |
| 43 | Barron County | Low | 0.29 / yr | $8M | |
| 44 | Ozaukee County | Low | 1.04 / yr | $17M | |
| 45 | Lincoln County | Low | 0.32 / yr | $9M | |
| 46 | Crawford County | Low | 2.54 / yr | $8M | |
| 47 | Burnett County | Low | 0.29 / yr | $6M | |
| 48 | Polk County | Low | 0.36 / yr | $8M | |
| 49 | Jackson County | Low | 1.75 / yr | $6M | |
| 50 | Door County | Low | 0.21 / yr | $7M | |
| 51 | Dunn County | Low | 0.57 / yr | $10M | |
| 52 | Pierce County | Low | 0.46 / yr | $9M | |
| 53 | Waushara County | Low | 0.39 / yr | $6M | |
| 54 | Rusk County | Low | 0.29 / yr | $5M | |
| 55 | Green County | Low | 1.68 / yr | $7M | |
| 56 | Marquette County | Low | 0.39 / yr | $5M | |
| 57 | Taylor County | Low | 0.36 / yr | $5M | |
| 58 | Langlade County | Low | 0.21 / yr | $4M | |
| 59 | Price County | Low | 0.32 / yr | $4M | |
| 60 | Bayfield County | Very Low | 0.64 / yr | $3M | |
| 61 | Calumet County | Very Low | 0.46 / yr | $7M | |
| 62 | Washburn County | Very Low | 0.14 / yr | $4M | |
| 63 | Iowa County | Very Low | 0.68 / yr | $5M | |
| 64 | Ashland County | Very Low | 0.75 / yr | $3M | |
| 65 | Lafayette County | Very Low | 1.25 / yr | $4M | |
| 66 | Buffalo County | Very Low | 1.00 / yr | $3M | |
| 67 | Kewaunee County | Very Low | 0.68 / yr | $4M | |
| 68 | Forest County | Very Low | 0.14 / yr | $2M | |
| 69 | Iron County | Very Low | 0.32 / yr | $2M | |
| 70 | Pepin County | Very Low | 0.50 / yr | $2M | |
| 71 | Florence County | Very Low | 0.25 / yr | $1M | |
| 72 | Menominee County | Very Low | 0.14 / yr | $667K |
72 Wisconsin counties with measurable riverine flood risk. See the national riverine flood ranking or all Wisconsin counties by overall risk.
Frequently Asked Questions
Which Wisconsin county has the highest riverine flood risk?
Milwaukee County has the highest FEMA riverine flood risk score in Wisconsin at 97.0 (High), with $101M in expected annual losses and about 2.11 events per year.
How many Wisconsin counties face significant riverine flood risk?
72 Wisconsin counties record measurable riverine flood risk in FEMA's National Risk Index; 2 of them are rated High or Very High.