// Risk Intelligence
| Risk Score | 7 / 10 High |
| Facility Type | 🌊 Major Dam / Flood Control |
| Operator / Branch | US Army Corps of Engineers |
| Host County | Multnomah County OR |
| Nearest City | Washington DC |
| Primary Risk Radius | 10 miles |
| Secondary Risk Radius | 50 miles |
// Strategic Significance
The Willamette River levee system protects Portland and the Willamette Valley from flooding. The 1996 Willamette River flood was the worst in 30 years. Many Willamette River levees provide only minimal protection. The Columbia River Slough adjacent to Portland also poses flood risk for low-lying industrial and residential areas.
// Civilian Impact Assessment
Portland metro with 2.5 million residents faces Willamette River flood risk. The Vanport flood of 1948 destroyed an entire city of 18,000 people overnight when a railroad embankment failed. Low-lying Portland neighborhoods remain vulnerable.
// Evacuation & Shelter Guidance
I-5, I-205, US-30. Multnomah County Emergency Management coordinates Willamette River flood protocols with Portland Emergency Management.