This pictures is of the Historic Eads Bridge - Saint Louis, Missouri. The Eads Bridge was completed in 1874. It was the longest arch bridge in the world, at that time of completion. It was the first bridge to completely use the cantilever design and spans 6,442 feet (1,964 meters). The caissons are some of the deepest ever sunk, causing 15 workers to die from decompression sickness, with another 77 workers permanently disabled. This bridge stands as a testament to 19th Century engineering. It still carries train and automobile traffic today.