Number 6: I-355 Extension Bridge

I-355 Extension Bridge
I-355 Extension Bridge

This bridge will rise 90 ft above the ground at its highest point. It is the focal point of a project that will reduce congestion in one of the fastest-growing counties in the U.S. The contractor had to work around several endangered species and work within a limited footprint.

Location: Lemont, Ill.
Cost: $124 million
Length: 1.3 miles
Type: Precast, post-tensioned concrete bridge
Designer: American Consulting Engineers, Crawford, Murphy & Tilley, V3 Cos. of Illinois, Bollinger Lach & Assoc., Wight & Co.
Owner: Illinois Tollway
Contractor: Walsh Construction Co.