Harrison County
Ohio — Natural Disaster Risk Assessment
Very LowComposite Risk Score
National percentile: 11th
Harrison County faces very low composite natural disaster risk (NRI Risk Index score 11.4, 11th national percentile), driven primarily by landslide and strong wind exposure. Expected annual loss across all 18 hazard types is $4M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Top Hazards
All 18 Hazard Risks
| Landslide | Low | 0.88 / yr | $19K |
| Strong Wind | Medium | 2.17 / yr | $714K |
| Drought | Low | 6.16 / yr | $226K |
| Hail | Low | 3.88 / yr | $133K |
| Lightning | Low | 42.05 / yr | $117K |
| Hurricane | Very Low | 0.01 / yr | $16K |
| Riverine Flood | Very Low | 1.36 / yr | $2M |
| Heat Wave | Very Low | 2.05 / yr | $87K |
| Earthquake | Very Low | 0.00 / yr | $31K |
| Ice Storm | Very Low | 0.27 / yr | $14K |
| Tornado | Very Low | 0.16 / yr | $163K |
| Wildfire | Very Low | 0.00 / yr | $5K |
| Winter Weather | Very Low | 9.68 / yr | $9K |
| Cold Wave | Very Low | 2.84 / yr | $40K |
| Avalanche | Very Low | 0.00 / yr | $0 |
| Coastal Flood | 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 Harrison County?
Harrison County has a composite FEMA National Risk Index score of 11.4 out of 100, placing it in the Very Low category and the 11th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Harrison County?
The three highest-rated hazards are Landslide (Low, $19K EAL), Strong Wind (Medium, $714K EAL), Drought (Low, $226K EAL). These account for most of the county's expected annual losses.
How does Harrison County compare to other Ohio counties?
Harrison County ranks #88 of 88 Ohio 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. Harrison County's $4M EAL is a statistical average, not a guarantee for any specific year or address.