Lewis County
New York — Natural Disaster Risk Assessment
Very LowComposite Risk Score
National percentile: 25th
Lewis County faces very low composite natural disaster risk (NRI Risk Index score 24.7, 25th national percentile), driven primarily by ice storm and winter weather exposure. Expected annual loss across all 18 hazard types is $9M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Top Hazards
All 18 Hazard Risks
| Ice Storm | Medium | 0.73 / yr | $294K |
| Winter Weather | Medium | 42.14 / yr | $136K |
| Landslide | Very Low | 0.62 / yr | $2K |
| Riverine Flood | Low | 1.04 / yr | $7M |
| Hurricane | Very Low | 0.01 / yr | $64K |
| Earthquake | Very Low | 0.00 / yr | $255K |
| Strong Wind | Low | 0.94 / yr | $354K |
| Cold Wave | Low | 5.16 / yr | $380K |
| Lightning | Very Low | 25.77 / yr | $89K |
| Tornado | Very Low | 0.13 / yr | $201K |
| Heat Wave | Very Low | 1.16 / yr | $41K |
| Wildfire | Very Low | 0.00 / yr | $5K |
| Hail | Very Low | 1.04 / yr | $22K |
| Avalanche | Very Low | 0.00 / yr | $0 |
| Coastal Flood | Very Low | 0.00 / yr | $0 |
| Drought | 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 Lewis County?
Lewis County has a composite FEMA National Risk Index score of 24.7 out of 100, placing it in the Very Low category and the 25th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Lewis County?
The three highest-rated hazards are Ice Storm (Medium, $294K EAL), Winter Weather (Medium, $136K EAL), Landslide (Very Low, $2K EAL). These account for most of the county's expected annual losses.
How does Lewis County compare to other New York counties?
Lewis County ranks #59 of 62 New York 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. Lewis County's $9M EAL is a statistical average, not a guarantee for any specific year or address.