Madison County
Idaho — Natural Disaster Risk Assessment
LowComposite Risk Score
National percentile: 59th
Madison County faces low composite natural disaster risk (NRI Risk Index score 58.6, 59th national percentile), driven primarily by lightning and earthquake exposure. Expected annual loss across all 18 hazard types is $22M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Top Hazards
All 18 Hazard Risks
| Lightning | High | 36.45 / yr | $1M |
| Earthquake | Low | 0.01 / yr | $4M |
| Cold Wave | Medium | 2.12 / yr | $6M |
| Heat Wave | Low | 1.24 / yr | $1M |
| Avalanche | Low | 0.03 / yr | $11K |
| Wildfire | Low | 0.00 / yr | $194K |
| Winter Weather | Medium | 21.27 / yr | $134K |
| Volcanic Activity | Very Low | 0.00 / yr | $63 |
| Landslide | Low | 0.26 / yr | $4K |
| Riverine Flood | Low | 0.64 / yr | $9M |
| Hail | Low | 0.33 / yr | $210K |
| Drought | Very Low | 39.51 / yr | $6K |
| Strong Wind | Low | 0.69 / yr | $187K |
| Ice Storm | Very Low | 0.01 / yr | $13K |
| Tornado | Very Low | 0.04 / yr | $70K |
| 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 Madison County?
Madison County has a composite FEMA National Risk Index score of 58.6 out of 100, placing it in the Low category and the 59th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Madison County?
The three highest-rated hazards are Lightning (High, $1M EAL), Earthquake (Low, $4M EAL), Cold Wave (Medium, $6M EAL). These account for most of the county's expected annual losses.
How does Madison County compare to other Idaho counties?
Madison County ranks #11 of 44 Idaho counties for overall natural disaster risk, with a 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. Madison County's $22M EAL is a statistical average, not a guarantee for any specific year or address.