Dewey County
Oklahoma — Natural Disaster Risk Assessment
Very LowComposite Risk Score
National percentile: 16th
Dewey County faces very low composite natural disaster risk (NRI Risk Index score 15.6, 16th national percentile), driven primarily by ice storm and drought exposure. Expected annual loss across all 18 hazard types is $6M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Top Hazards
All 18 Hazard Risks
| Ice Storm | High | 0.94 / yr | $1M |
| Drought | Medium | 90.41 / yr | $1M |
| Wildfire | Low | 0.01 / yr | $215K |
| Landslide | Very Low | 0.46 / yr | $2K |
| Strong Wind | Low | 4.06 / yr | $423K |
| Hail | Low | 7.89 / yr | $162K |
| Tornado | Low | 0.73 / yr | $769K |
| Cold Wave | Low | 2.79 / yr | $582K |
| Heat Wave | Very Low | 7.11 / yr | $103K |
| Winter Weather | Low | 9.32 / yr | $23K |
| Earthquake | Very Low | 0.00 / yr | $35K |
| Hurricane | Very Low | 0.01 / yr | $2K |
| Riverine Flood | Very Low | 0.32 / yr | $753K |
| Lightning | Very Low | 48.84 / yr | $6K |
| 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 Dewey County?
Dewey County has a composite FEMA National Risk Index score of 15.6 out of 100, placing it in the Very Low category and the 16th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Dewey County?
The three highest-rated hazards are Ice Storm (High, $1M EAL), Drought (Medium, $1M EAL), Wildfire (Low, $215K EAL). These account for most of the county's expected annual losses.
How does Dewey County compare to other Oklahoma counties?
Dewey County ranks #74 of 77 Oklahoma 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. Dewey County's $6M EAL is a statistical average, not a guarantee for any specific year or address.