Most Flood-Prone Counties in Wisconsin

Based on NOAA Storm Events Database records from 1996 to 2025, these are the Wisconsin counties with the most recorded flood events. Vernon County tops the list with 151 events. The data includes river floods, flash floods, coastal flooding, and hurricane-related flooding.

Rank	County	Total Events	River Floods	Flash Floods
1	Vernon County	151	108	43
2	Grant County	133	64	69
3	Crawford County	121	81	40
4	Trempealeau County	98	77	21
5	La Crosse County	80	64	16
6	Dane County	79	32	47
7	Rock County	78	55	23
8	Jackson County	75	62	13
9	Columbia County	66	42	24
10	Milwaukee County	66	30	36
11	Sauk County	60	25	35
12	Waukesha County	57	21	36
13	Kenosha County	54	32	22
14	Jefferson County	48	32	16
15	Green County	46	28	18
16	Lafayette County	44	24	20
17	Juneau County	43	37	6
18	Richland County	43	17	26
19	Racine County	41	26	15
20	Dodge County	39	17	22
21	Buffalo County	36	15	21
22	Ozaukee County	36	21	15
23	Bayfield County	36	4	32
24	Clark County	36	23	13
25	Monroe County	33	15	18
26	Sheboygan County	29	17	12
27	Walworth County	28	11	17
28	Fond du Lac County	25	13	12
29	Iowa County	23	9	14
30	Douglas County	22	6	16
31	Brown County	21	9	12
32	Ashland County	20	7	13
33	Chippewa County	20	2	18
34	Oconto County	20	18	2
35	Sawyer County	20	6	14
36	Adams County	19	12	7
37	Marathon County	19	7	12
38	Eau Claire County	18	2	16
39	Price County	17	3	14
40	Washington County	17	5	12
41	Dunn County	16	1	15
42	Wood County	16	5	11
43	Kewaunee County	16	16	0
44	St. Croix County	16	0	16
45	Calumet County	15	4	11
46	Outagamie County	15	5	10
47	Portage County	15	6	9
48	Manitowoc County	14	7	7
49	Pierce County	12	1	11
50	Winnebago County	12	6	6
51	Green Lake County	11	8	3
52	Marquette County	11	7	4
53	Taylor County	11	7	4
54	Washburn County	11	2	9
55	Waupaca County	11	4	7
56	Waushara County	11	5	6
57	Pepin County	11	2	9
58	Burnett County	10	3	7
59	Barron County	9	0	9
60	Rusk County	9	0	9
61	Oneida County	9	6	3
62	Marinette County	8	3	5
63	Polk County	8	1	7
64	Iron County	6	2	4
65	Vilas County	6	4	2
66	Langlade County	6	4	2
67	Lincoln County	5	4	1
68	Shawano County	4	2	2
69	Forest County	3	0	3
70	Florence County	3	0	3
71	Menominee County	3	2	1
72	Door County	2	0	2

Source: NOAA Storm Events Database (1996–2025).

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Most Flood-Prone Counties in Wisconsin

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