I-270 Chain of Rocks Bridge
Location
Granite City, Illinois
Owner
Illinois Department of Transportation
Architect
Parsons Transportation Group, Inc.
Contract Value
$496,200,000
Walsh Construction is replacing the I-270 Chain of Rocks Bridge over the Mississippi River. This new structure is being built directly south of the existing Chain of Rocks Bridge and is the first of the project's twin bridges to be built. The second will be constructed on the same alignment as the existing bridge. The new structure consists of new abutments, piers on drilled shafts with permanent casing and rock sockets, steel plate girders, slab deck, removal of the existing structure and a new roadway pavement.