Gem County
Idaho — Natural Disaster Risk Assessment
Very LowComposite Risk Score
National percentile: 34th
Gem County faces very low composite natural disaster risk (NRI Risk Index score 34.4, 34th national percentile), driven primarily by wildfire and winter weather exposure. Expected annual loss across all 18 hazard types is $11M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Top Hazards
All 18 Hazard Risks
| Wildfire | Medium | 0.02 / yr | $6M |
| Winter Weather | Low | 11.81 / yr | $74K |
| Earthquake | Very Low | 0.00 / yr | $295K |
| Avalanche | Very Low | 0.03 / yr | $540 |
| Landslide | Very Low | 0.46 / yr | $1K |
| Volcanic Activity | Very Low | 0.00 / yr | $9 |
| Heat Wave | Low | 3.46 / yr | $284K |
| Riverine Flood | Low | 0.36 / yr | $4M |
| Strong Wind | Low | 0.32 / yr | $233K |
| Ice Storm | Very Low | 0.04 / yr | $22K |
| Lightning | Very Low | 20.85 / yr | $69K |
| Drought | Very Low | 12.54 / yr | $77 |
| Cold Wave | Very Low | 0.05 / yr | $34K |
| Tornado | Very Low | 0.03 / yr | $26K |
| Hail | Very Low | 0.23 / yr | $12K |
| 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 Gem County?
Gem County has a composite FEMA National Risk Index score of 34.4 out of 100, placing it in the Very Low category and the 34th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Gem County?
The three highest-rated hazards are Wildfire (Medium, $6M EAL), Winter Weather (Low, $74K EAL), Earthquake (Very Low, $295K EAL). These account for most of the county's expected annual losses.
How does Gem County compare to other Idaho counties?
Gem County ranks #24 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. Gem County's $11M EAL is a statistical average, not a guarantee for any specific year or address.