- Named after the builder, Eads Bridge is a combination road and railway bridge over the Mississippi River. It joins St. Louis with East St. Louis in Illinois. At 6,442 ft, it was the bridge with the longest arch in the world, constructed of steel arch spans, and was the first bridge to use this material. This was also the deepest sunk bridge, and one of the first to use the cantilever support method and pneumatic caissons. It is still open for road and pedestrian traffic, and only light rail traffic passes over it.
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