Clark County
Idaho — Natural Disaster Risk Assessment
Very LowComposite Risk Score
National percentile: 1th
Clark County faces very low composite natural disaster risk (NRI Risk Index score 0.8, 1th national percentile), driven primarily by avalanche and wildfire exposure. Expected annual loss across all 18 hazard types is $1M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Top Hazards
All 18 Hazard Risks
| Avalanche | Medium | 0.07 / yr | $468K |
| Wildfire | Low | 0.00 / yr | $151K |
| Landslide | Very Low | 0.71 / yr | $2K |
| Earthquake | Very Low | 0.02 / yr | $109K |
| Volcanic Activity | Very Low | 0.00 / yr | $1 |
| Drought | Very Low | 92.83 / yr | $1K |
| Winter Weather | Very Low | 26.60 / yr | $15K |
| Cold Wave | Very Low | 2.58 / yr | $154K |
| Heat Wave | Very Low | 0.35 / yr | $7K |
| Lightning | Very Low | 35.87 / yr | $14K |
| Riverine Flood | Very Low | 0.29 / yr | $506K |
| Strong Wind | Very Low | 0.62 / yr | $10K |
| Hail | Very Low | 0.22 / yr | $3K |
| Tornado | Very Low | 0.13 / yr | $2K |
| Ice Storm | Very Low | 0.01 / yr | $336 |
| Coastal Flood | Very Low | 0.00 / yr | $0 |
| Hurricane | Very Low | 0.00 / yr | $0 |
| Tsunami | Very Low | 0.00 / yr | $0 |
Frequently Asked Questions
What is the overall natural disaster risk for Clark County?
Clark County has a composite FEMA National Risk Index score of 0.8 out of 100, placing it in the Very Low category and the 1th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Clark County?
The three highest-rated hazards are Avalanche (Medium, $468K EAL), Wildfire (Low, $151K EAL), Landslide (Very Low, $2K EAL). These account for most of the county's expected annual losses.
How does Clark County compare to other Idaho counties?
Clark County ranks #44 of 44 Idaho counties for overall natural disaster risk, with a very low rating.
What does Expected Annual Loss (EAL) mean?
EAL is FEMA's estimate of average annual dollar losses from natural hazards, calculated from historical event data and exposure models. Clark County's $1M EAL is a statistical average, not a guarantee for any specific year or address.