California Bridges
SF-Oakland Bay Bridge

This bridge is the often over-shadowed by its neighbor, the Golden Gate Bridge. However it has more superlatives than the GG. Open earlier, more traffic, more lanes, longer overall spans, and 2 decks of traffic.

The Bay Bridge actually consists of 3 bridges, a causeway and tunnel. From Oakland cars after the toll plaza, cars enter the causeway. The causeway steadily rises to the Cantilever span. From there you make landfall onto Yerba-Buena Island. Here you enter a tunnel. After the tunnel, you enter onto the  2 back-to-back suspension bridges, linked at the middle by a concrete pier. 

The upper-deck is for SF bound traffic, lower, Oakland. Originally the top deck was two-way traffic for cars only. The lower deck was for trucks/busses, plus 2 tracks for interurbans from Oakland & the East Bay.

This bridge suffered damage from the Loma Prieta earthquake in 1989. The Cantilevered span is due to be replaced due to earthquakes, but not sure when it will be built.