// Risk Intelligence
| Risk Score | 7 / 10 High |
| Facility Type | 🌊 Major Dam / Flood Control |
| Operator / Branch | US Army Corps of Engineers |
| Host County | Umatilla County OR |
| Nearest City | Washington DC |
| Primary Risk Radius | 20 miles |
| Secondary Risk Radius | 100 miles |
// Strategic Significance
McNary Dam on the Columbia River near the Oregon-Washington border creates Lake Wallula and is a key navigation and power facility. It is the furthest inland port accessible to ocean-going vessels on the Columbia-Snake River system.
// Civilian Impact Assessment
Umatilla OR and Kennewick-Richland-Pasco WA with 300,000 combined residents are in the downstream zone. The Tri-Cities WA metro faces serious inundation risk.
// Evacuation & Shelter Guidance
US-730, US-395. Umatilla County and Benton County WA Emergency Management coordinate with Army Corps.