Most Flood-Prone Counties in North Dakota

Based on NOAA Storm Events Database records from 1996 to 2025, these are the North Dakota counties with the most recorded flood events. Cass County tops the list with 74 events. The data includes river floods, flash floods, coastal flooding, and hurricane-related flooding.

Rank	County	Total Events	River Floods	Flash Floods
1	Cass County	74	24	50
2	Grand Forks County	70	16	54
3	Richland County	64	20	44
4	Benson County	46	25	21
5	Nelson County	45	30	15
6	Pembina County	42	29	13
7	Ramsey County	42	25	17
8	Walsh County	42	25	17
9	Sargent County	34	12	22
10	Burleigh County	32	10	22
11	Ransom County	31	13	18
12	Barnes County	25	8	17
13	Ward County	25	10	15
14	Traill County	24	10	14
15	Stutsman County	23	5	18
16	Steele County	22	10	12
17	Eddy County	21	5	16
18	Morton County	20	11	9
19	Towner County	17	9	8
20	Cavalier County	17	10	7
21	McHenry County	16	9	7
22	Bottineau County	15	8	7
23	Mountrail County	15	8	7
24	Wells County	15	4	11
25	Rolette County	13	4	9
26	Sioux County	13	5	8
27	Dickey County	12	4	8
28	Griggs County	12	5	7
29	Dunn County	11	7	4
30	LaMoure County	11	3	8
31	McLean County	11	5	6
32	Mercer County	11	7	4
33	Renville County	11	4	7
34	Oliver County	10	5	5
35	Williams County	10	6	4
36	Grant County	9	4	5
37	Emmons County	8	2	6
38	Hettinger County	8	4	4
39	Foster County	7	3	4
40	Kidder County	7	2	5
41	McKenzie County	7	7	0
42	Stark County	6	2	4
43	Golden Valley County	5	1	4
44	Billings County	5	2	3
45	Logan County	5	2	3
46	Pierce County	5	3	2
47	Bowman County	4	3	1
48	McIntosh County	4	2	2
49	Adams County	4	3	1
50	Burke County	3	2	1
51	Sheridan County	2	1	1
52	Divide County	2	2	0
53	Slope County	1	1	0

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

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