Dome

Bridge crossing San Diego Bay; widest single span at center; Locally referred to as the Coronado Bridge, it is a "pre-stressed concrete/steel" girder bridge, crossing over San Diego Bay, linking San Diego with Coronado. The grade of the bridge and the 90-degree angle turn is to create 200 ft. clearance for an empty oil-fired aircraft carrier to pass beneath it; the longest span is 660 ft. The bridge required 20,000 tons of steel (13,000 tons in structural steel and 7,000 in reinforcing steel) and 94,000 cubic yards of concrete. It supports 5 lanes of vehicular traffic and is 63 ft. wide between the curbs. Source: Wikipedia; http://en.wikipedia.org/wiki/Main_Page (accessed 8/15/2015)