Riverine Flood Risk in North Dakota

All North Dakota counties ranked by FEMA National Risk Index riverine flood score

Riverine Flood risk — rivers and streams overflowing their banks after heavy rain or snowmelt — is rated for 53 of 53 North Dakota counties in FEMA's National Risk Index. Cass County carries the state's highest riverine flood score at 80.6, with $34M in expected annual riverine flood losses.

No North Dakota county reaches the High band for riverine flood, and expected annual losses from riverine flood total roughly $161M statewide. The full ranking below links to each county's complete 18-hazard risk profile.

County Rankings — Riverine Flood

#CountyRiverine Flood ScoreRatingAnn. Freq.Ann. Loss
1 Cass County
80.6
Medium 2.18 / yr $34M
2 Burleigh County
77.4
Medium 1.04 / yr $23M
3 Grand Forks County
61.7
Low 1.89 / yr $12M
4 Williams County
42.9
Low 0.39 / yr $8M
5 Ward County
41.9
Low 0.82 / yr $8M
6 Barnes County
41.3
Low 0.86 / yr $4M
7 Morton County
40.4
Low 0.68 / yr $8M
8 Walsh County
35.4
Low 1.61 / yr $5M
9 McLean County
33.1
Very Low 0.43 / yr $5M
10 Emmons County
30.9
Very Low 0.32 / yr $3M
11 Richland County
29.5
Very Low 2.14 / yr $4M
12 Pembina County
28.7
Very Low 1.75 / yr $3M
13 Stutsman County
26.9
Very Low 0.79 / yr $3M
14 Stark County
22.3
Very Low 0.25 / yr $3M
15 Rolette County
21.6
Very Low 0.43 / yr $2M
16 Mercer County
16.4
Very Low 0.43 / yr $3M
17 McKenzie County
15.3
Very Low 0.29 / yr $3M
18 Ransom County
14.3
Very Low 1.36 / yr $2M
19 Traill County
12.7
Very Low 1.11 / yr $3M
20 Mountrail County
11.9
Very Low 0.57 / yr $1M
21 Bottineau County
11.6
Very Low 0.50 / yr $2M
22 McIntosh County
10.8
Very Low 0.14 / yr $971K
23 Dunn County
10.1
Very Low 0.46 / yr $1M
24 Sioux County
10.0
Very Low 0.43 / yr $726K
25 Ramsey County
10.0
Very Low 2.07 / yr $2M
26 Hettinger County
9.7
Very Low 0.32 / yr $1M
27 McHenry County
8.1
Very Low 0.57 / yr $2M
28 Cavalier County
6.8
Very Low 0.71 / yr $835K
29 Benson County
6.7
Very Low 2.18 / yr $584K
30 Grant County
6.7
Very Low 0.29 / yr $729K
31 Dickey County
6.5
Very Low 0.46 / yr $918K
32 Oliver County
6.5
Very Low 0.36 / yr $1M
33 Divide County
6.1
Very Low 0.07 / yr $711K
34 Logan County
5.9
Very Low 0.21 / yr $677K
35 LaMoure County
5.5
Very Low 0.39 / yr $876K
36 Wells County
4.9
Very Low 0.57 / yr $691K
37 Nelson County
4.3
Very Low 2.00 / yr $460K
38 Sheridan County
4.1
Very Low 0.07 / yr $862K
39 Foster County
3.2
Very Low 0.25 / yr $525K
40 Golden Valley County
3.1
Very Low 0.14 / yr $444K
41 Kidder County
3.1
Very Low 0.29 / yr $683K
42 Billings County
3.0
Very Low 0.21 / yr $723K
43 Sargent County
2.7
Very Low 1.11 / yr $662K
44 Adams County
2.5
Very Low 0.14 / yr $321K
45 Pierce County
2.5
Very Low 0.14 / yr $582K
46 Bowman County
2.4
Very Low 0.14 / yr $551K
47 Steele County
2.3
Very Low 0.75 / yr $505K
48 Griggs County
1.7
Very Low 0.61 / yr $319K
49 Renville County
1.7
Very Low 0.39 / yr $488K
50 Burke County
1.7
Very Low 0.11 / yr $475K
51 Eddy County
1.4
Very Low 0.86 / yr $416K
52 Towner County
1.1
Very Low 0.79 / yr $314K
53 Slope County
0.6
Very Low 0.04 / yr $220K

53 North Dakota counties with measurable riverine flood risk. See the national riverine flood ranking or all North Dakota counties by overall risk.

Frequently Asked Questions

Which North Dakota county has the highest riverine flood risk?

Cass County has the highest FEMA riverine flood risk score in North Dakota at 80.6 (Medium), with $34M in expected annual losses and about 2.18 events per year.

How many North Dakota counties face significant riverine flood risk?

53 North Dakota counties record measurable riverine flood risk in FEMA's National Risk Index; 0 of them are rated High or Very High.

Other Hazards in North Dakota

Cold Wave Drought Earthquake Hail Heat Wave Ice Storm Landslide Lightning Strong Wind Tornado Wildfire Winter Weather