Earthquake Risk in Idaho
All Idaho counties ranked by FEMA National Risk Index earthquake score
Earthquake risk — ground shaking from sudden movement along geologic faults — is rated for 44 of 44 Idaho counties in FEMA's National Risk Index. Bonneville County carries the state's highest earthquake score at 94.2, with $16M in expected annual earthquake losses.
No Idaho county reaches the High band for earthquake, and expected annual losses from earthquake total roughly $59M statewide. The full ranking below links to each county's complete 18-hazard risk profile.
County Rankings — Earthquake
| # | County | Earthquake Score | Rating | Ann. Freq. | Ann. Loss |
|---|---|---|---|---|---|
| 1 | Bonneville County | Medium | 0.03 / yr | $16M | |
| 2 | Bingham County | Low | 0.02 / yr | $4M | |
| 3 | Ada County | Low | 0.00 / yr | $7M | |
| 4 | Madison County | Low | 0.01 / yr | $4M | |
| 5 | Fremont County | Low | 0.04 / yr | $3M | |
| 6 | Bannock County | Low | 0.01 / yr | $3M | |
| 7 | Jefferson County | Low | 0.01 / yr | $2M | |
| 8 | Custer County | Low | 0.03 / yr | $951K | |
| 9 | Kootenai County | Low | 0.00 / yr | $2M | |
| 10 | Canyon County | Low | 0.00 / yr | $2M | |
| 11 | Teton County | Low | 0.02 / yr | $2M | |
| 12 | Cassia County | Low | 0.01 / yr | $1M | |
| 13 | Minidoka County | Low | 0.00 / yr | $1M | |
| 14 | Twin Falls County | Low | 0.00 / yr | $1M | |
| 15 | Blaine County | Low | 0.01 / yr | $1M | |
| 16 | Caribou County | Low | 0.03 / yr | $1M | |
| 17 | Franklin County | Low | 0.01 / yr | $1M | |
| 18 | Bear Lake County | Low | 0.02 / yr | $1M | |
| 19 | Valley County | Low | 0.01 / yr | $676K | |
| 20 | Jerome County | Very Low | 0.00 / yr | $319K | |
| 21 | Gooding County | Very Low | 0.00 / yr | $412K | |
| 22 | Power County | Very Low | 0.01 / yr | $450K | |
| 23 | Payette County | Very Low | 0.00 / yr | $457K | |
| 24 | Bonner County | Very Low | 0.00 / yr | $353K | |
| 25 | Washington County | Very Low | 0.00 / yr | $253K | |
| 26 | Lemhi County | Very Low | 0.02 / yr | $288K | |
| 27 | Gem County | Very Low | 0.00 / yr | $295K | |
| 28 | Butte County | Very Low | 0.01 / yr | $207K | |
| 29 | Latah County | Very Low | 0.00 / yr | $237K | |
| 30 | Elmore County | Very Low | 0.01 / yr | $218K | |
| 31 | Idaho County | Very Low | 0.00 / yr | $123K | |
| 32 | Boise County | Very Low | 0.01 / yr | $158K | |
| 33 | Oneida County | Very Low | 0.01 / yr | $206K | |
| 34 | Shoshone County | Very Low | 0.00 / yr | $121K | |
| 35 | Nez Perce County | Very Low | 0.00 / yr | $196K | |
| 36 | Adams County | Very Low | 0.00 / yr | $106K | |
| 37 | Owyhee County | Very Low | 0.00 / yr | $65K | |
| 38 | Lincoln County | Very Low | 0.00 / yr | $83K | |
| 39 | Clark County | Very Low | 0.02 / yr | $109K | |
| 40 | Benewah County | Very Low | 0.00 / yr | $46K | |
| 41 | Boundary County | Very Low | 0.00 / yr | $36K | |
| 42 | Lewis County | Very Low | 0.00 / yr | $31K | |
| 43 | Camas County | Very Low | 0.00 / yr | $35K | |
| 44 | Clearwater County | Very Low | 0.00 / yr | $25K |
44 Idaho counties with measurable earthquake risk. See the national earthquake ranking or all Idaho counties by overall risk.
Frequently Asked Questions
Which Idaho county has the highest earthquake risk?
Bonneville County has the highest FEMA earthquake risk score in Idaho at 94.2 (Medium), with $16M in expected annual losses and about 0.03 events per year.
How many Idaho counties face significant earthquake risk?
44 Idaho counties record measurable earthquake risk in FEMA's National Risk Index; 0 of them are rated High or Very High.