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

#CountyRiverine Flood ScoreRatingAnn. Freq.Ann. Loss
1 Milwaukee County
97.0
High 2.11 / yr $101M
2 Dane County
94.3
High 2.07 / yr $84M
3 Brown County
91.9
Medium 1.11 / yr $57M
4 Waukesha County
89.8
Medium 1.75 / yr $68M
5 Winnebago County
89.3
Medium 0.57 / yr $43M
6 Marathon County
87.7
Medium 0.79 / yr $36M
7 Rock County
87.6
Medium 2.11 / yr $38M
8 Racine County
85.7
Medium 1.64 / yr $30M
9 Eau Claire County
79.9
Medium 0.64 / yr $24M
10 Jefferson County
79.5
Medium 1.57 / yr $23M
11 Monroe County
78.4
Medium 0.71 / yr $14M
12 Wood County
77.7
Medium 0.71 / yr $20M
13 Sauk County
77.5
Medium 1.79 / yr $20M
14 Outagamie County
77.1
Medium 0.64 / yr $25M
15 Kenosha County
76.6
Medium 2.00 / yr $20M
16 Columbia County
75.6
Medium 1.96 / yr $19M
17 Fond du Lac County
74.3
Medium 0.64 / yr $19M
18 La Crosse County
74.0
Medium 2.32 / yr $19M
19 Walworth County
73.2
Medium 0.93 / yr $18M
20 Marinette County
72.7
Low 0.71 / yr $14M
21 Adams County
72.5
Low 0.54 / yr $10M
22 Sheboygan County
71.8
Low 0.96 / yr $18M
23 Chippewa County
71.0
Low 0.75 / yr $16M
24 Juneau County
70.7
Low 1.14 / yr $11M
25 Vernon County
70.2
Low 2.61 / yr $10M
26 Manitowoc County
69.7
Low 0.75 / yr $15M
27 Clark County
69.1
Low 0.82 / yr $8M
28 Oconto County
68.8
Low 1.00 / yr $13M
29 Dodge County
68.0
Low 0.93 / yr $14M
30 Trempealeau County
67.5
Low 2.82 / yr $12M
31 Portage County
66.8
Low 0.46 / yr $18M
32 Waupaca County
66.3
Low 0.36 / yr $10M
33 Washington County
66.1
Low 0.61 / yr $20M
34 St. Croix County
64.1
Low 0.46 / yr $16M
35 Richland County
62.9
Low 1.21 / yr $8M
36 Green Lake County
62.3
Low 0.46 / yr $7M
37 Grant County
62.2
Low 2.64 / yr $9M
38 Sawyer County
62.1
Low 0.39 / yr $7M
39 Douglas County
61.5
Low 0.54 / yr $11M
40 Oneida County
61.1
Low 0.36 / yr $10M
41 Vilas County
60.9
Low 0.25 / yr $7M
42 Shawano County
59.7
Low 0.29 / yr $10M
43 Barron County
59.1
Low 0.29 / yr $8M
44 Ozaukee County
58.3
Low 1.04 / yr $17M
45 Lincoln County
56.2
Low 0.32 / yr $9M
46 Crawford County
56.1
Low 2.54 / yr $8M
47 Burnett County
55.5
Low 0.29 / yr $6M
48 Polk County
55.2
Low 0.36 / yr $8M
49 Jackson County
54.7
Low 1.75 / yr $6M
50 Door County
52.1
Low 0.21 / yr $7M
51 Dunn County
50.2
Low 0.57 / yr $10M
52 Pierce County
48.7
Low 0.46 / yr $9M
53 Waushara County
44.9
Low 0.39 / yr $6M
54 Rusk County
44.7
Low 0.29 / yr $5M
55 Green County
44.4
Low 1.68 / yr $7M
56 Marquette County
43.5
Low 0.39 / yr $5M
57 Taylor County
42.5
Low 0.36 / yr $5M
58 Langlade County
39.2
Low 0.21 / yr $4M
59 Price County
38.7
Low 0.32 / yr $4M
60 Bayfield County
33.5
Very Low 0.64 / yr $3M
61 Calumet County
33.1
Very Low 0.46 / yr $7M
62 Washburn County
32.5
Very Low 0.14 / yr $4M
63 Iowa County
31.7
Very Low 0.68 / yr $5M
64 Ashland County
28.2
Very Low 0.75 / yr $3M
65 Lafayette County
27.3
Very Low 1.25 / yr $4M
66 Buffalo County
24.6
Very Low 1.00 / yr $3M
67 Kewaunee County
24.4
Very Low 0.68 / yr $4M
68 Forest County
20.7
Very Low 0.14 / yr $2M
69 Iron County
18.4
Very Low 0.32 / yr $2M
70 Pepin County
16.2
Very Low 0.50 / yr $2M
71 Florence County
11.0
Very Low 0.25 / yr $1M
72 Menominee County
7.4
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.

Other Hazards in Wisconsin