Eads Bridge

Eads Bridge is a combined road and railway bridge over the Mississippi River connecting the cities of St. Louis, Missouri and East St. Louis, Illinois. It is located on the St. Louis riverfront between Laclede's Landing, to the north, and the grounds of the Gateway Arch, to the south. The bridge is named for its designer and builder, James Buchanan Eads. Work on the bridge began in 1867, and it was completed in 1874. Eads Bridge was the first bridge across the Mississippi south of the Missouri River. Earlier bridges were located north of the Missouri, where the Mississippi is smaller. None of the earlier bridges survive, which means that Eads Bridge is also the oldest bridge on the river.
In order to accommodate the massive size and strength of the Mississippi River, the Eads Bridge required a number of engineering feats. Perhaps most importantly, it was the first large-scale use of steel as a structural material and initiated the shift from wrought-iron to steel as the default material for large structures. Its foundations were the deepest underwater constructions at the time, at more than 100 feet below water level.
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