// Risk Intelligence
| Risk Score | 8 / 10 High |
| Facility Type | 🌊 Major Dam / Flood Control |
| Operator / Branch | King County Flood Control District |
| Host County | King County WA |
| Nearest City | Pepperell MA |
| Primary Risk Radius | 10 miles |
| Secondary Risk Radius | 50 miles |
// Strategic Significance
The Green River levee system protects the Green River valley south of Seattle including Auburn Kent Renton and Tukwila from catastrophic flooding. Howard Hanson Dam upstream was found to have a seepage problem in 2009 requiring emergency repairs and reducing its flood storage capacity. During the 2009 emergency King County issued evacuation orders for 70,000 valley residents as officials feared the dam could fail.
// Civilian Impact Assessment
The Green River valley with 100,000 residents and massive industrial warehousing supporting Seattle area commerce faces serious flood risk. Howard Hanson Dam seepage problems reduced protection. Boeing facilities and major distribution centers are in the flood zone.
// Evacuation & Shelter Guidance
SR-167, SR-18, Auburn Way. King County Emergency Management maintains detailed Green River valley evacuation plans with 70,000 resident warning protocols.