Multnomah County and Portland face serious Cascadia Subduction Zone earthquake risk. A full rupture of the Cascadia fault could produce a magnitude 9.0 earthquake and tsunami affecting the entire Pacific Northwest coast. Portland's older building stock — much of it unreinforced masonry — is particularly vulnerable. The Columbia and Willamette Rivers create major flood risk, and the Columbia River Gorge creates wildfire corridors.
// Preparedness Recommendations
- Evacuation routes inland should be identified in advance.
- Store at least 72 hours of food and water.
- Elevate critical belongings above flood level.
- Have backup power ready in case of grid failure.
// Recommended Supplies
Essential gear for power outages, severe weather, and emergency situations in your area.
- Emergency Food Supplies
- Water Filtration & Storage
- Backup Generator
- Solar Backup Power
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// Risk Intelligence
| Threat Score | 7 / 10 High Risk |
| Primary Hazard | Earthquake / Flooding |
| Secondary Hazard | Wildfire |
| FEMA Flood Zone | Zone X (Seismic High Risk) |
| Federally Declared Disasters | 40 |
| Last Major Event | Cascadia Earthquake Risk (ongoing) |
| Event Frequency | Major event every 4–6 years |
// Emergency Operations
| Emergency Mgmt Phone | (503) 988-6700 |
| Emergency Shelters | 44 designated facilities |
| Evacuation Routes | I-5 South, I-84 East, US-26 West, OR-99E South |
// County Profile
| County | Multnomah County OR |
| State | Oregon (OR) |
| Population | 815,428 |
| Area | 465 sq miles |
| FEMA Region | Zone X (Seismic High Risk) |
// Major Cities
// Cities in This County
// Other Oregon Counties
// Nearby Infrastructure Risks
Critical infrastructure facilities within or near this area that could affect civilian safety during emergencies, conflict, or infrastructure failures.
Infrastructure risk data is for emergency preparedness awareness. Facility locations are publicly known. Always follow official emergency guidance.