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|Map: Chicago Department of Transportation|
The provisional structure is a Bailey Bridge, named after its inventor, Donald Bailey. An employee of the British War Office during World War II, Bailey liked to create model bridges as hobby, but the design he created for a bridge constructed out of lightweight, precision-made modular steel components was anything but a toy.
Bailey Bridge became the western allies' standard military bridge. Over 2,000 were constructed, with 700,000 Bailey panels providing 350 miles of bridging. Field Marshall Montgomery credited the Baily Bridges with helping speed the path to victory by creating the ability to quickly construct crossings that sustained an aggressive forward movement of troops and supplies. Bailey Bridges remain in use today throughout the world, with the longest spanning 2,585 feet, and the highest rising over 18,000 feet above sea level.
|Rendering: Chicago Department of Transportation|
|photograph: Bob Johnson|