// Risk Intelligence
| Risk Score | 8 / 10 High |
| Facility Type | 🌊 Major Dam / Flood Control |
| Operator / Branch | US Army Corps of Engineers |
| Host County | Hughes County SD |
| Nearest City | Washington DC |
| Primary Risk Radius | 50 miles |
| Secondary Risk Radius | 200 miles |
// Strategic Significance
Oahe Dam near Pierre South Dakota creates Lake Oahe the largest reservoir in the US by volume. A failure would send catastrophic Missouri River flooding through South Dakota Nebraska Kansas and Missouri. The Dakota Access Pipeline controversy brought national attention to this region.
// Civilian Impact Assessment
Hughes County with 17,000 residents and the Standing Rock and Crow Creek tribal nations downstream. Vast downstream Missouri River communities face catastrophic flooding risk.
// Evacuation & Shelter Guidance
US-83, SD Route 34, Missouri River. Hughes County Emergency Management coordinates dam failure protocols.