Clackamas County
Oregon — Natural Disaster Risk Assessment
HighComposite Risk Score
National percentile: 95th
Clackamas County faces high composite natural disaster risk (NRI Risk Index score 94.9, 95th national percentile), driven primarily by earthquake and landslide exposure. Expected annual loss across all 18 hazard types is $219M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Top Hazards
All 18 Hazard Risks
| Earthquake | High | 0.02 / yr | $109M |
| Landslide | Medium | 1.93 / yr | $210K |
| Volcanic Activity | Medium | 0.01 / yr | $495K |
| Heat Wave | Medium | 4.92 / yr | $8M |
| Cold Wave | High | 0.38 / yr | $15M |
| Riverine Flood | High | 0.93 / yr | $77M |
| Strong Wind | High | 0.08 / yr | $3M |
| Ice Storm | High | 1.11 / yr | $1M |
| Wildfire | Low | 0.00 / yr | $1M |
| Avalanche | High | 0.13 / yr | $2M |
| Winter Weather | High | 26.07 / yr | $368K |
| Lightning | High | 8.43 / yr | $1M |
| Tornado | Low | 0.15 / yr | $1M |
| Hail | Very Low | 0.13 / yr | $165K |
| Coastal Flood | Very Low | 0.31 / yr | $200 |
| Drought | Very Low | 6.80 / yr | $378 |
| Hurricane | Very Low | 0.00 / yr | $0 |
| Tsunami | Very Low | 0.00 / yr | $0 |
Frequently Asked Questions
What is the overall natural disaster risk for Clackamas County?
Clackamas County has a composite FEMA National Risk Index score of 94.9 out of 100, placing it in the High category and the 95th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Clackamas County?
The three highest-rated hazards are Earthquake (High, $109M EAL), Landslide (Medium, $210K EAL), Volcanic Activity (Medium, $495K EAL). These account for most of the county's expected annual losses.
How does Clackamas County compare to other Oregon counties?
Clackamas County ranks #6 of 36 Oregon counties for overall natural disaster risk, with a high 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. Clackamas County's $219M EAL is a statistical average, not a guarantee for any specific year or address.