Landslide Risk in Iowa

All Iowa counties ranked by FEMA National Risk Index landslide score

Landslide risk — downhill movement of rock, soil, and debris on unstable slopes — is rated for 99 of 99 Iowa counties in FEMA's National Risk Index. Allamakee County carries the state's highest landslide score at 92.0, with $66K in expected annual landslide losses.

No Iowa county reaches the High band for landslide, and expected annual losses from landslide total roughly $807K statewide. The full ranking below links to each county's complete 18-hazard risk profile.

County Rankings — Landslide

#CountyLandslide ScoreRatingAnn. Freq.Ann. Loss
1 Allamakee County
92.0
Medium 0.69 / yr $66K
2 Pottawattamie County
91.3
Medium 0.53 / yr $77K
3 Clayton County
91.1
Medium 0.81 / yr $71K
4 Jackson County
88.9
Medium 0.72 / yr $63K
5 Dubuque County
86.6
Low 0.51 / yr $67K
6 Harrison County
84.6
Low 0.44 / yr $27K
7 Woodbury County
84.0
Low 0.45 / yr $26K
8 Plymouth County
81.1
Low 0.18 / yr $20K
9 Winneshiek County
80.9
Low 0.30 / yr $23K
10 Crawford County
79.8
Low 0.53 / yr $16K
11 Davis County
79.5
Low 0.27 / yr $10K
12 Johnson County
79.1
Low 0.20 / yr $20K
13 Madison County
78.7
Low 0.26 / yr $13K
14 Mills County
78.4
Low 0.20 / yr $20K
15 Monona County
76.8
Low 0.29 / yr $11K
16 Lee County
75.0
Low 0.21 / yr $9K
17 Lucas County
73.8
Low 0.30 / yr $7K
18 Guthrie County
73.7
Low 0.31 / yr $13K
19 Jasper County
73.5
Low 0.26 / yr $10K
20 Wapello County
73.4
Low 0.18 / yr $8K
21 Marion County
73.2
Low 0.28 / yr $10K
22 Appanoose County
73.1
Low 0.28 / yr $6K
23 Van Buren County
73.0
Low 0.25 / yr $6K
24 Des Moines County
72.7
Low 0.14 / yr $8K
25 Decatur County
72.7
Low 0.39 / yr $7K
26 Warren County
72.4
Low 0.27 / yr $12K
27 Jones County
71.8
Low 0.24 / yr $11K
28 Poweshiek County
71.8
Low 0.22 / yr $8K
29 Clinton County
71.6
Low 0.19 / yr $7K
30 Shelby County
71.2
Low 0.38 / yr $11K
31 Scott County
71.0
Low 0.12 / yr $8K
32 Iowa County
70.6
Low 0.25 / yr $7K
33 Monroe County
69.9
Low 0.39 / yr $8K
34 Audubon County
69.1
Low 0.27 / yr $5K
35 Fremont County
68.7
Low 0.17 / yr $6K
36 Polk County
68.4
Low 0.12 / yr $6K
37 Linn County
68.3
Low 0.14 / yr $6K
38 Muscatine County
68.2
Low 0.09 / yr $5K
39 Fayette County
68.1
Low 0.16 / yr $4K
40 Delaware County
67.9
Low 0.11 / yr $5K
41 Clarke County
67.5
Low 0.28 / yr $7K
42 Cass County
65.5
Low 0.21 / yr $3K
43 Louisa County
64.7
Low 0.10 / yr $5K
44 Tama County
64.4
Low 0.17 / yr $3K
45 Union County
62.8
Low 0.18 / yr $3K
46 Henry County
62.2
Very Low 0.13 / yr $3K
47 Webster County
61.5
Very Low 0.10 / yr $3K
48 Washington County
61.3
Very Low 0.14 / yr $3K
49 Dallas County
59.9
Very Low 0.11 / yr $5K
50 Adair County
59.6
Very Low 0.24 / yr $2K
51 Page County
59.1
Very Low 0.17 / yr $2K
52 Ringgold County
59.1
Very Low 0.26 / yr $4K
53 Mahaska County
58.9
Very Low 0.15 / yr $3K
54 Jefferson County
58.3
Very Low 0.14 / yr $2K
55 Montgomery County
57.6
Very Low 0.17 / yr $2K
56 Cedar County
57.3
Very Low 0.13 / yr $4K
57 Adams County
56.8
Very Low 0.18 / yr $2K
58 Wayne County
55.6
Very Low 0.21 / yr $2K
59 Keokuk County
54.3
Very Low 0.19 / yr $2K
60 Boone County
53.2
Very Low 0.09 / yr $3K
61 Marshall County
51.0
Very Low 0.11 / yr $1K
62 Taylor County
49.3
Very Low 0.15 / yr $1K
63 Carroll County
44.9
Very Low 0.10 / yr $1K
64 Cherokee County
43.9
Very Low 0.08 / yr $858
65 Story County
43.6
Very Low 0.07 / yr $1K
66 Benton County
42.5
Very Low 0.10 / yr $1K
67 Hardin County
40.6
Very Low 0.08 / yr $697
68 Ida County
40.6
Very Low 0.12 / yr $726
69 Buena Vista County
40.5
Very Low 0.06 / yr $672
70 Dickinson County
36.6
Very Low 0.05 / yr $651
71 Cerro Gordo County
34.3
Very Low 0.07 / yr $411
72 Hamilton County
33.6
Very Low 0.07 / yr $467
73 Greene County
33.5
Very Low 0.07 / yr $481
74 Lyon County
33.4
Very Low 0.07 / yr $615
75 Clay County
32.6
Very Low 0.06 / yr $564
76 Black Hawk County
31.8
Very Low 0.06 / yr $409
77 Kossuth County
31.0
Very Low 0.11 / yr $506
78 Winnebago County
31.0
Very Low 0.05 / yr $325
79 Sioux County
30.2
Very Low 0.08 / yr $538
80 Emmet County
30.0
Very Low 0.05 / yr $320
81 Floyd County
29.4
Very Low 0.05 / yr $281
82 Mitchell County
28.9
Very Low 0.05 / yr $347
83 Humboldt County
25.6
Very Low 0.05 / yr $241
84 Buchanan County
25.3
Very Low 0.06 / yr $312
85 Sac County
24.8
Very Low 0.07 / yr $310
86 Bremer County
24.3
Very Low 0.05 / yr $330
87 Wright County
23.7
Very Low 0.07 / yr $169
88 Hancock County
22.2
Very Low 0.06 / yr $173
89 Howard County
22.1
Very Low 0.05 / yr $218
90 Butler County
21.9
Very Low 0.06 / yr $230
91 Calhoun County
20.5
Very Low 0.06 / yr $116
92 Chickasaw County
20.1
Very Low 0.05 / yr $125
93 Franklin County
20.1
Very Low 0.06 / yr $166
94 Worth County
17.3
Very Low 0.04 / yr $122
95 Pocahontas County
16.9
Very Low 0.06 / yr $83
96 Palo Alto County
16.3
Very Low 0.06 / yr $117
97 Osceola County
15.3
Very Low 0.04 / yr $61
98 O'Brien County
14.2
Very Low 0.06 / yr $98
99 Grundy County
11.9
Very Low 0.05 / yr $64

99 Iowa counties with measurable landslide risk. See the national landslide ranking or all Iowa counties by overall risk.

Frequently Asked Questions

Which Iowa county has the highest landslide risk?

Allamakee County has the highest FEMA landslide risk score in Iowa at 92.0 (Medium), with $66K in expected annual losses and about 0.69 events per year.

How many Iowa counties face significant landslide risk?

99 Iowa counties record measurable landslide risk in FEMA's National Risk Index; 0 of them are rated High or Very High.

Other Hazards in Iowa

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