Landslide Risk in Idaho
All Idaho counties ranked by FEMA National Risk Index landslide score
Landslide risk — downhill movement of rock, soil, and debris on unstable slopes — is rated for 44 of 44 Idaho counties in FEMA's National Risk Index. Idaho County carries the state's highest landslide score at 98.9, with $943K in expected annual landslide losses.
3 Idaho counties are rated High or Very High for landslide, and expected annual losses from landslide total roughly $4M statewide. The full ranking below links to each county's complete 18-hazard risk profile.
County Rankings — Landslide
| # | County | Landslide Score | Rating | Ann. Freq. | Ann. Loss |
|---|---|---|---|---|---|
| 1 | Idaho County | High | 6.34 / yr | $943K | |
| 2 | Shoshone County | High | 2.34 / yr | $580K | |
| 3 | Custer County | High | 7.27 / yr | $414K | |
| 4 | Boundary County | Medium | 0.67 / yr | $369K | |
| 5 | Boise County | Medium | 2.09 / yr | $356K | |
| 6 | Clearwater County | Medium | 1.86 / yr | $239K | |
| 7 | Valley County | Medium | 4.25 / yr | $214K | |
| 8 | Lemhi County | Medium | 4.10 / yr | $139K | |
| 9 | Kootenai County | Medium | 0.52 / yr | $171K | |
| 10 | Bonneville County | Medium | 1.53 / yr | $142K | |
| 11 | Bonner County | Medium | 0.76 / yr | $96K | |
| 12 | Benewah County | Medium | 0.35 / yr | $91K | |
| 13 | Twin Falls County | Medium | 0.29 / yr | $95K | |
| 14 | Adams County | Medium | 1.11 / yr | $58K | |
| 15 | Blaine County | Low | 0.88 / yr | $41K | |
| 16 | Bear Lake County | Low | 1.04 / yr | $29K | |
| 17 | Elmore County | Low | 0.89 / yr | $20K | |
| 18 | Fremont County | Low | 0.96 / yr | $19K | |
| 19 | Latah County | Low | 0.65 / yr | $12K | |
| 20 | Washington County | Low | 1.47 / yr | $6K | |
| 21 | Owyhee County | Low | 1.57 / yr | $4K | |
| 22 | Ada County | Low | 0.15 / yr | $9K | |
| 23 | Teton County | Low | 0.47 / yr | $7K | |
| 24 | Bingham County | Low | 0.68 / yr | $6K | |
| 25 | Madison County | Low | 0.26 / yr | $4K | |
| 26 | Bannock County | Very Low | 1.19 / yr | $3K | |
| 27 | Camas County | Very Low | 0.46 / yr | $2K | |
| 28 | Butte County | Very Low | 0.42 / yr | $2K | |
| 29 | Cassia County | Very Low | 0.85 / yr | $1K | |
| 30 | Clark County | Very Low | 0.71 / yr | $2K | |
| 31 | Gem County | Very Low | 0.46 / yr | $1K | |
| 32 | Caribou County | Very Low | 3.42 / yr | $1K | |
| 33 | Nez Perce County | Very Low | 0.40 / yr | $1K | |
| 34 | Franklin County | Very Low | 0.91 / yr | $978 | |
| 35 | Lewis County | Very Low | 0.19 / yr | $519 | |
| 36 | Payette County | Very Low | 0.20 / yr | $633 | |
| 37 | Jefferson County | Very Low | 0.22 / yr | $596 | |
| 38 | Canyon County | Very Low | 0.06 / yr | $420 | |
| 39 | Gooding County | Very Low | 0.10 / yr | $210 | |
| 40 | Oneida County | Very Low | 0.96 / yr | $213 | |
| 41 | Power County | Very Low | 0.59 / yr | $116 | |
| 42 | Jerome County | Very Low | 0.06 / yr | $22 | |
| 43 | Minidoka County | Very Low | 0.09 / yr | $27 | |
| 44 | Lincoln County | Very Low | 0.18 / yr | $22 |
44 Idaho counties with measurable landslide risk. See the national landslide ranking or all Idaho counties by overall risk.
Frequently Asked Questions
Which Idaho county has the highest landslide risk?
Idaho County has the highest FEMA landslide risk score in Idaho at 98.9 (High), with $943K in expected annual losses and about 6.34 events per year.
How many Idaho counties face significant landslide risk?
44 Idaho counties record measurable landslide risk in FEMA's National Risk Index; 3 of them are rated High or Very High.