Rock Island County
Illinois — Natural Disaster Risk Assessment
MediumComposite Risk Score
National percentile: 84th
Rock Island County faces medium composite natural disaster risk (NRI Risk Index score 84.1, 84th national percentile), driven primarily by cold wave and strong wind exposure. Expected annual loss across all 18 hazard types is $45M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Top Hazards
All 18 Hazard Risks
| Cold Wave | High | 6.26 / yr | $11M |
| Strong Wind | High | 6.18 / yr | $2M |
| Heat Wave | Medium | 7.21 / yr | $4M |
| Hail | Medium | 3.99 / yr | $2M |
| Tornado | High | 0.42 / yr | $7M |
| Winter Weather | High | 15.58 / yr | $360K |
| Lightning | High | 44.04 / yr | $1M |
| Landslide | Low | 0.25 / yr | $23K |
| Ice Storm | Medium | 0.67 / yr | $366K |
| Riverine Flood | Medium | 3.07 / yr | $17M |
| Drought | Medium | 8.53 / yr | $464K |
| Earthquake | Low | 0.00 / yr | $451K |
| Hurricane | Very Low | 0.01 / yr | $3K |
| Wildfire | Very Low | 0.00 / yr | $2K |
| 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 Rock Island County?
Rock Island County has a composite FEMA National Risk Index score of 84.1 out of 100, placing it in the Medium category and the 84th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Rock Island County?
The three highest-rated hazards are Cold Wave (High, $11M EAL), Strong Wind (High, $2M EAL), Heat Wave (Medium, $4M EAL). These account for most of the county's expected annual losses.
How does Rock Island County compare to other Illinois counties?
Rock Island County ranks #19 of 102 Illinois counties for overall natural disaster risk, with a medium 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. Rock Island County's $45M EAL is a statistical average, not a guarantee for any specific year or address.