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 155 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	155	112	43
2	Grant County	138	69	69
3	Crawford County	126	86	40
4	Trempealeau County	102	81	21
5	Rock County	85	62	23
6	La Crosse County	83	67	16
7	Dane County	82	35	47
8	Jackson County	75	62	13
9	Milwaukee County	72	34	36
10	Columbia County	70	46	24
11	Sauk County	68	33	35
12	Kenosha County	67	41	22
13	Waukesha County	61	25	36
14	Green County	58	40	18
15	Jefferson County	55	39	16
16	Racine County	52	33	15
17	Lafayette County	48	28	20
18	Juneau County	44	38	6
19	Ozaukee County	44	26	15
20	Richland County	43	17	26
21	Dodge County	42	20	22
22	Bayfield County	40	5	33
23	Buffalo County	39	18	21
24	Clark County	37	24	13
25	Sheboygan County	36	22	12
26	Brown County	34	14	12
27	Monroe County	34	16	18
28	Walworth County	32	15	17
29	Oconto County	31	23	2
30	Marathon County	28	16	12
31	Ashland County	27	10	15
32	Fond du Lac County	27	15	12
33	Manitowoc County	24	13	7
34	Douglas County	24	7	17
35	Iowa County	24	10	14
36	Washington County	23	11	12
37	Wood County	23	12	11
38	Chippewa County	21	3	18
39	Marinette County	21	13	5
40	Sawyer County	21	7	14
41	Adams County	21	14	7
42	Outagamie County	20	10	10
43	Eau Claire County	19	3	16
44	Kewaunee County	19	17	0
45	St. Croix County	19	3	16
46	Price County	18	3	15
47	Winnebago County	18	12	6
48	Dunn County	17	2	15
49	Pierce County	17	6	11
50	Calumet County	16	5	11
51	Portage County	16	7	9
52	Pepin County	15	6	9
53	Green Lake County	14	11	3
54	Taylor County	13	9	4
55	Waupaca County	13	6	7
56	Waushara County	13	7	6
57	Marquette County	12	8	4
58	Oneida County	12	9	3
59	Lincoln County	11	10	1
60	Polk County	11	4	7
61	Washburn County	11	2	9
62	Burnett County	11	4	7
63	Barron County	10	1	9
64	Rusk County	10	1	9
65	Iron County	9	3	6
66	Shawano County	9	7	2
67	Florence County	8	5	3
68	Door County	7	1	2
69	Vilas County	7	5	2
70	Langlade County	7	5	2
71	Forest County	4	1	3
72	Menominee County	4	3	1

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

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Most Flood-Prone Counties in Wisconsin

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