// Risk Intelligence
| Risk Score | 8 / 10 High |
| Facility Type | 🌉 Bridge / Critical Crossing |
| Operator / Branch | California Department of Transportation |
| Host County | Alameda County CA |
| Nearest City | Washington DC |
| Primary Risk Radius | 5 miles |
| Secondary Risk Radius | 25 miles |
// Strategic Significance
The San Francisco-Oakland Bay Bridge is the busiest bridge in the US carrying 270,000 vehicles daily. During the 1989 Loma Prieta earthquake a 50-foot section of the upper deck collapsed onto the lower deck killing 1 person and closing the bridge for a month. The eastern span was replaced in 2013 after decades of seismic retrofit work. A major Hayward Fault earthquake could again damage the bridge. The Bay Bridge is more critical to Bay Area supply chains than the Golden Gate Bridge due to its freight traffic volume.
// Civilian Impact Assessment
Alameda County with 1.7 million residents and San Francisco County with 875,000 residents. The Bay Bridge carries 270,000 vehicles daily. The 1989 Loma Prieta earthquake caused a section collapse and month-long closure. A major Hayward Fault earthquake could again damage the bridge disrupting the Bay Area economy.
// Evacuation & Shelter Guidance
I-80, I-580, Bay Bridge Toll Plaza. Alameda County and San Francisco Emergency Management coordinate earthquake and bridge closure protocols.