Allegheny River Bridge Construction Completed in Pennsylvania
Construction of the new twin Allegheny River Bridges in Pennsylvania began on July 9, 2007 to replace the existing 55-year-old steel truss structure. The new 2,350-foot-long, cast-in-place segmental concrete bridges, with main spans of 532 feet, was constructed using the balanced cantilever method with form travelers supplied by SDI. SDI provided the post-tensioning system for the bridges. The $190 million project is complete under contract with the Pennsylvania Turnpike Authority.