The Lake Pontchartrain Causeway (New Orleans)...the World's Longest Bridge. The Causeway is the longest over-water highway bridge in the world.
The northbound span extends 23.87 miles and the southbound 23.86 miles.
The longest suspension bridge - to date -in America is: Verrazano-Narrows 1298 New York, NY USA 1964 Above graph taken from : http://www.tkk.fi/Units/Bridge/longspan.html
This bridge, which has the longest center span of any suspension bridge in the world, is located in Kobe, Japan.
Akashi-Kaikyo Bridge, Japan is the longest single span bridge which is 1,991 meters long.
The longest single span bridges are suspension bridges. Currently the longest is the Akashi-Kaikyo Bridge in Japan. Its main span is 1,991 metres.
The longest Girder bridge in the world is located in Ponte Costa e Silva, Brazil its total length is 700m and its center span is 300m.
The worlds longest cantilever bridge, by span, is Quebec Bridge, Canada at 1800 feet. The second longest is the Forth Bridge, Scotland at 1710 feet
Main span means the longest part of the bridge.
It is the Benjamin Franklin Bridge, with a span of 1,750 feet.
The Sutong Bridge in China, the longest cable-stayed bridge in the World, has a span of 1,088 metres or 3,570 feet
The Akashi-Kaikyo Bridge in Japan
If the question is which type of bridge the answer is a suspension bridge.
16 years
London Bridge spans the River Thames in Central London