The San Diego-Coronado Bridge, locally referred to as the Coronado Bridge, is a "prestressed concrete/steel" girder bridge, crossing over San Diego Bay in the United States, linking San Diego with Coronado, California. The bridge is signed as part of State Route 75.
The 11,179-foot-long (3,407 m or 2.1 mi) bridge ascends from Coronado at a 4.67 percent grade before curving 80 degrees toward San Diego. The span reaches a maximum height of 200 feet (61m), allowing the U.S. Navy ships which operate out of the nearby Naval Station San Diego to pass underneath it. The five-lane bridge featured the longest box girder in the world until it was surpassed by a bridge in Chongqing, China in 2008. The bridge doesn't form a direct path to Coronado, but rather has a curve. This was done so it would be high enough for all U.S. Navy ships to pass underneath but not too steep for vehicles to ascend and descend.
The bridge contains five lanes: two eastbound, two westbound, and a reversible middle lane with a moveable barrier system which can be used to create a third lane in either direction in response to traffic volume. The eastern end of the bridge connects directly to a T interchange with Interstate 5, just southeast of downtown San Diego. It is designated and signed as part of California State Highway 75. The bridge was designed entirely and exclusively for motor vehicle traffic; there are no pedestrian walkways, bike paths, or shoulders ("breakdown lanes"). Beginning in 2008, cyclists have the once-a-year opportunity to ride over the bridge in the Bike the Bay "fun ride".