We all know about Bay Bridge.This is located in San Francisco.It is most beautiful bridge in our world.Bay Bridge  has one of the longest spans in the world.This Maintained by California Department of Transportation.Bay Bridge carries approximately 280,000 vehicles per day on its two decks.

More Details about Bay Bridge
Carries- 10 lanes
Crosses- San Francisco Bay via Yerba Buena Island
Locale- San Francisco and Oakland
Maintained by- California Department of Transportation
Designer- Charles H. Purcell
Material- Steel, concrete
Total length- West span: 10,304 feet (3,141 m)
                     East span: 10,176 feet (3,102 m)
Toll- Cars (east span, westbound only)
        $6.00 (rush hours)
        $2.50 (carpool rush hours)
        $4.00 (weekday non-rush hours)
        $5.00 (weekend all day
        Total: 4.46 miles (7.18 km)
Construction Started-  8 July 1933
Opened- November 12, 1936
              excluding approaches
Width- 5 traffic lanes totaling 57.5 feet(17.5 m)
Height-West- 526 feet (160 m)
source-wikipedia