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The Chicago Skyway also known as Chicago Skyway Toll Bridge System is a 7.8 mile (12.5 km) long tollway bridging Interstate 90 at the Dan Ryan Expressway on the west end, and the Indiana Toll Road on the east end. The main feature of the Skyway is a 1/2-mile (800 m) long steel truss bridge, known as the "High Bridge". The bridge spans the Little Calumet River and Calumet Harbor, a major harbor for industrial ships. The main span is 650 feet (197 m) long, provides for 125 feet (37.9 m) of vertical clearance, and is the highest road in Chicago. In 2001-04 authorities spent $250 million (USD) to rebuild much of the Skyway. 

http://www.chicagoskyway.org/