Arch bridges ... River bridge Today materials like steel and pre-stressed concrete have made it possible to build longer and more elegant arches, including a spectacular 1700 foot span in New ...

Arch bridges ... River bridge Today materials like steel and pre-stressed concrete have made it possible to build longer and more elegant arches, including a spectacular 1,700-foot span in New ...

When have three bridges opened to let another bridge pass underneath them? It happened in New Jersey Wednesday afternoon, when the first of three giant steel ... has three arch spans totaling ...