Iowa landslide risk
99 counties scored 0 rated Very High
Allamakee County has the highest landslide risk in Iowa, scoring 92 out of 100 — rated "Relatively Moderate" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
NOAA events 2016–2026 |
|---|---|---|---|---|
| 1 | Allamakee County | 92 | Relatively Moderate | 0 |
| 2 | Pottawattamie County | 91.3 | Relatively Moderate | 0 |
| 3 | Clayton County | 91.1 | Relatively Moderate | 0 |
| 4 | Jackson County | 88.9 | Relatively Moderate | 0 |
| 5 | Dubuque County | 86.6 | Relatively Low | 0 |
| 6 | Harrison County | 84.6 | Relatively Low | 0 |
| 7 | Woodbury County | 84 | Relatively Low | 0 |
| 8 | Plymouth County | 81.1 | Relatively Low | 0 |
| 9 | Winneshiek County | 80.9 | Relatively Low | 0 |
| 10 | Crawford County | 79.8 | Relatively Low | 0 |
| 11 | Davis County | 79.5 | Relatively Low | 0 |
| 12 | Johnson County | 79.1 | Relatively Low | 0 |
| 13 | Madison County | 78.7 | Relatively Low | 0 |
| 14 | Mills County | 78.4 | Relatively Low | 0 |
| 15 | Monona County | 76.8 | Relatively Low | 0 |
| 16 | Lee County | 75 | Relatively Low | 0 |
| 17 | Lucas County | 73.8 | Relatively Low | 0 |
| 18 | Guthrie County | 73.7 | Relatively Low | 0 |
| 19 | Jasper County | 73.5 | Relatively Low | 0 |
| 20 | Wapello County | 73.4 | Relatively Low | 0 |
| 21 | Marion County | 73.2 | Relatively Low | 0 |
| 22 | Appanoose County | 73.1 | Relatively Low | 0 |
| 23 | Van Buren County | 73 | Relatively Low | 0 |
| 24 | Decatur County | 72.7 | Relatively Low | 0 |
| 25 | Des Moines County | 72.7 | Relatively Low | 0 |
| 26 | Warren County | 72.4 | Relatively Low | 0 |
| 27 | Jones County | 71.8 | Relatively Low | 0 |
| 28 | Poweshiek County | 71.8 | Relatively Low | 0 |
| 29 | Clinton County | 71.6 | Relatively Low | 0 |
| 30 | Shelby County | 71.2 | Relatively Low | 0 |
| 31 | Scott County | 71 | Relatively Low | 0 |
| 32 | Iowa County | 70.6 | Relatively Low | 0 |
| 33 | Monroe County | 69.9 | Relatively Low | 0 |
| 34 | Audubon County | 69.1 | Relatively Low | 0 |
| 35 | Fremont County | 68.7 | Relatively Low | 0 |
| 36 | Polk County | 68.4 | Relatively Low | 0 |
| 37 | Linn County | 68.3 | Relatively Low | 0 |
| 38 | Muscatine County | 68.2 | Relatively Low | 0 |
| 39 | Fayette County | 68.1 | Relatively Low | 0 |
| 40 | Delaware County | 67.9 | Relatively Low | 0 |
| 41 | Clarke County | 67.5 | Relatively Low | 0 |
| 42 | Cass County | 65.5 | Relatively Low | 0 |
| 43 | Louisa County | 64.7 | Relatively Low | 0 |
| 44 | Tama County | 64.4 | Relatively Low | 0 |
| 45 | Union County | 62.8 | Relatively Low | 0 |
| 46 | Henry County | 62.2 | Very Low | 0 |
| 47 | Webster County | 61.5 | Very Low | 0 |
| 48 | Washington County | 61.3 | Very Low | 0 |
| 49 | Dallas County | 59.9 | Very Low | 0 |
| 50 | Adair County | 59.6 | Very Low | 0 |
| 51 | Page County | 59.1 | Very Low | 0 |
| 52 | Ringgold County | 59.1 | Very Low | 0 |
| 53 | Mahaska County | 58.9 | Very Low | 0 |
| 54 | Jefferson County | 58.3 | Very Low | 0 |
| 55 | Montgomery County | 57.6 | Very Low | 0 |
| 56 | Cedar County | 57.3 | Very Low | 0 |
| 57 | Adams County | 56.8 | Very Low | 0 |
| 58 | Wayne County | 55.6 | Very Low | 0 |
| 59 | Keokuk County | 54.3 | Very Low | 0 |
| 60 | Boone County | 53.2 | Very Low | 0 |
| 61 | Marshall County | 51 | Very Low | 0 |
| 62 | Taylor County | 49.3 | Very Low | 0 |
| 63 | Carroll County | 44.9 | Very Low | 0 |
| 64 | Cherokee County | 43.9 | Very Low | 0 |
| 65 | Story County | 43.6 | Very Low | 0 |
| 66 | Benton County | 42.5 | Very Low | 0 |
| 67 | Hardin County | 40.6 | Very Low | 0 |
| 68 | Ida County | 40.6 | Very Low | 0 |
| 69 | Buena Vista County | 40.5 | Very Low | 0 |
| 70 | Dickinson County | 36.6 | Very Low | 0 |
| 71 | Cerro Gordo County | 34.3 | Very Low | 0 |
| 72 | Hamilton County | 33.6 | Very Low | 0 |
| 73 | Greene County | 33.5 | Very Low | 0 |
| 74 | Lyon County | 33.4 | Very Low | 0 |
| 75 | Clay County | 32.6 | Very Low | 0 |
| 76 | Black Hawk County | 31.8 | Very Low | 0 |
| 77 | Kossuth County | 31 | Very Low | 0 |
| 78 | Winnebago County | 31 | Very Low | 0 |
| 79 | Sioux County | 30.2 | Very Low | 0 |
| 80 | Emmet County | 30 | Very Low | 0 |
| 81 | Floyd County | 29.4 | Very Low | 0 |
| 82 | Mitchell County | 28.9 | Very Low | 0 |
| 83 | Humboldt County | 25.6 | Very Low | 0 |
| 84 | Buchanan County | 25.3 | Very Low | 0 |
| 85 | Sac County | 24.8 | Very Low | 0 |
| 86 | Bremer County | 24.3 | Very Low | 0 |
| 87 | Wright County | 23.7 | Very Low | 0 |
| 88 | Hancock County | 22.2 | Very Low | 0 |
| 89 | Howard County | 22.1 | Very Low | 0 |
| 90 | Butler County | 21.9 | Very Low | 0 |
| 91 | Calhoun County | 20.5 | Very Low | 0 |
| 92 | Chickasaw County | 20.1 | Very Low | 0 |
| 93 | Franklin County | 20.1 | Very Low | 0 |
| 94 | Worth County | 17.3 | Very Low | 0 |
| 95 | Pocahontas County | 16.9 | Very Low | 0 |
| 96 | Palo Alto County | 16.3 | Very Low | 0 |
| 97 | Osceola County | 15.3 | Very Low | 0 |
| 98 | O'Brien County | 14.2 | Very Low | 0 |
| 99 | Grundy County | 11.9 | Very Low | 0 |
Source: FEMA National Risk Index v1.20.0, December 2025. Scores are 0–100 percentile rankings among all US counties. See the methodology page for definitions. Download the full CSV for all counties.
Landslide risk nationally:
Other hazard risks in Iowa:
Frequently asked questions
What is the highest landslide risk county in Iowa?
Allamakee County, IA has the highest landslide risk in Iowa, with a FEMA National Risk Index score of 92 out of 100 (rated "Relatively Moderate").
What causes landslide risk in Iowa?
Landslide risk covers expected losses from hillslope failures, rockfalls, and debris flows triggered by heavy rainfall, snowmelt, wildfire, or earthquakes. High scores concentrate in the Pacific Northwest, California coastal ranges, Appalachians, and Rocky Mountain foothills, where steep terrain combines with intense precipitation or seismic activity.