Bridges

A bridge is a structure designed to provide continuous passage over something. Bridges usually carry trains, cars, water, or power lines. There are about eight kinds of bridges, beam, cantilever, arch, truss, suspension, cable-stayed, movable, and floating bridges. Beam bridges are the most simple to build bridges. It is just a beam that is supported at both ends. These were the first bridges to be used. Beam bridges are the most commonly used in highway …

…costly or impractical to build a bridge with a high enough clearance. One example of a swing bridge is in Fort Madison, Iowa. Floating bridges are formed buy floating objects and placing a deck on top of them. Some floating bridges are made buy floating boats with a deck on top, others have pontoons. This is used were water is too deep or It is just temporarily there. They are commonly used for the military.