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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 224 events. The data includes river floods, flash floods, coastal flooding, and hurricane-related flooding.

RankCountyTotal EventsRiver FloodsFlash Floods
1Minnehaha County22415767
2Brown County16214022
3Union County15413519
4Brookings County1259728
5Lincoln County1238736
6Bon Homme County1049113
7Spink County100928
8Hutchinson County93849
9Davison County917219
10Moody County91874
11Sanborn County88844
12Yankton County836914
13Codington County837112
14Pennington County764432
15Beadle County715912
16Charles Mix County694920
17Turner County63567
18Clay County634419
19Hamlin County634518
20Hanson County60564
21Corson County503614
22Meade County492821
23Ziebach County402713
24Grant County392514
25Hand County381523
26Custer County371621
27Roberts County362412
28Lyman County332112
29Dewey County311714
30Haakon County31238
31Hughes County311813
32Day County291811
33Edmunds County291217
34Jackson County29209
35Perkins County281414
36Tripp County28199
37Brule County27189
38McCook County27189
39Fall River County271116
40Marshall County271512
41Oglala Lakota County26179
42Lawrence County251114
43Butte County24186
44Lake County241212
45Stanley County24159
46Clark County221210
47Aurora County20146
48Harding County19145
49Hyde County19910
50Jones County19172
51Douglas County18513
52McPherson County17107
53Potter County1789
54Deuel County1688
55Faulk County1697
56Kingsbury County16610
57Buffalo County1587
58Todd County15510
59Walworth County1578
60Mellette County1495
61Gregory County1376
62Sully County1174
63Bennett County1165
64Campbell County1156
65Miner County963
66Jerauld County642

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

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