Most Flood-Prone Counties in South Dakota

Based on NOAA Storm Events Database records from 1996 to 2025, these are the South Dakota counties with the most recorded flood events. Minnehaha County tops the list with 229 events. The data includes river floods, flash floods, coastal flooding, and hurricane-related flooding.

Rank	County	Total Events	River Floods	Flash Floods
1	Minnehaha County	229	162	67
2	Brown County	192	170	22
3	Union County	160	141	19
4	Brookings County	129	101	28
5	Lincoln County	127	91	36
6	Spink County	116	108	8
7	Bon Homme County	107	94	13
8	Hutchinson County	100	91	9
9	Davison County	99	80	19
10	Sanborn County	95	91	4
11	Moody County	95	91	4
12	Yankton County	89	75	14
13	Codington County	88	76	12
14	Pennington County	80	48	32
15	Beadle County	78	66	12
16	Hamlin County	77	51	18
17	Charles Mix County	71	51	20
18	Hanson County	67	63	4
19	Turner County	67	60	7
20	Clay County	67	48	19
21	Corson County	55	41	14
22	Meade County	51	30	21
23	Grant County	44	29	14
24	Roberts County	43	30	12
25	Hand County	42	19	23
26	Custer County	41	20	21
27	Ziebach County	41	28	13
28	Day County	39	25	11
29	Lyman County	38	26	12
30	Hughes County	35	22	13
31	Dewey County	34	20	14
32	Marshall County	34	22	12
33	Haakon County	32	24	8
34	Stanley County	32	23	9
35	Edmunds County	31	14	17
36	McCook County	30	21	9
37	Jackson County	30	21	9
38	Perkins County	30	16	14
39	Tripp County	30	21	9
40	Brule County	29	20	9
41	Fall River County	28	12	16
42	Lawrence County	27	13	14
43	Clark County	27	17	10
44	Oglala Lakota County	27	18	9
45	Butte County	26	20	6
46	Jones County	26	24	2
47	Lake County	26	14	12
48	Aurora County	22	16	6
49	Hyde County	22	12	10
50	Douglas County	20	7	13
51	Harding County	20	15	5
52	Deuel County	19	11	8
53	Faulk County	19	12	7
54	McPherson County	19	12	7
55	Potter County	19	10	9
56	Buffalo County	18	11	7
57	Kingsbury County	18	8	10
58	Walworth County	18	10	8
59	Mellette County	16	11	5
60	Todd County	16	6	10
61	Gregory County	15	9	6
62	Sully County	14	10	4
63	Campbell County	14	8	6
64	Bennett County	12	7	5
65	Miner County	11	8	3
66	Jerauld County	8	6	2

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

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Most Flood-Prone Counties in South Dakota

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