Ontonagon County
Michigan — Natural Disaster Risk Assessment
Very LowComposite Risk Score
National percentile: 4th
Ontonagon County faces very low composite natural disaster risk (NRI Risk Index score 4.2, 4th national percentile), driven primarily by winter weather and cold wave exposure. Expected annual loss across all 18 hazard types is $2M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Top Hazards
All 18 Hazard Risks
| Winter Weather | Low | 38.84 / yr | $70K |
| Cold Wave | Low | 4.11 / yr | $676K |
| Wildfire | Very Low | 0.00 / yr | $13K |
| Lightning | Low | 23.83 / yr | $79K |
| Drought | Very Low | 2.88 / yr | $6K |
| Strong Wind | Very Low | 0.82 / yr | $118K |
| Hail | Very Low | 0.74 / yr | $45K |
| Coastal Flood | Very Low | 0.00 / yr | $0 |
| Riverine Flood | Very Low | 0.29 / yr | $1M |
| Landslide | Very Low | 0.33 / yr | $16 |
| Tornado | Very Low | 0.15 / yr | $32K |
| Heat Wave | Very Low | 0.32 / yr | $6K |
| Ice Storm | Very Low | 0.01 / yr | $717 |
| Avalanche | Very Low | 0.00 / yr | $0 |
| Earthquake | Very Low | 0.00 / yr | $0 |
| Hurricane | Very Low | 0.00 / yr | $0 |
| Tsunami | Very Low | 0.00 / yr | $0 |
| Volcanic Activity | Very Low | 0.00 / yr | $0 |
Frequently Asked Questions
What is the overall natural disaster risk for Ontonagon County?
Ontonagon County has a composite FEMA National Risk Index score of 4.2 out of 100, placing it in the Very Low category and the 4th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Ontonagon County?
The three highest-rated hazards are Winter Weather (Low, $70K EAL), Cold Wave (Low, $676K EAL), Wildfire (Very Low, $13K EAL). These account for most of the county's expected annual losses.
How does Ontonagon County compare to other Michigan counties?
Ontonagon County ranks #81 of 83 Michigan 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. Ontonagon County's $2M EAL is a statistical average, not a guarantee for any specific year or address.