Loma Prieta earthquake (1989)
The 6.9-magnitude earthquake collapsed the Cypress Street Viaduct in Oakland, killing 42 people, and damaged San Francisco's Embarcadero and Central freeways. The quake exposed the vulnerability of the city's aging elevated freeways.
The damaged Embarcadero and Central freeways were demolished rather than rebuilt, reshaping San Francisco's waterfront and removing two elevated structures from the city.
The quake accelerated the end of San Francisco's elevated freeway era, with the city choosing surface boulevards over rebuilding. The remaining freeways, including 101's Hospital Curve, continued aging without major investment.
The Hospital Curve and other Fab 4 corridors are the same generation of freeway infrastructure that the 1989 quake damaged elsewhere. Their current rehabilitation addresses decades of deferred maintenance.
