Travelling from the Calumet Harbor to the Calumet River, the first bridge encountered is an imposing structure known as the Elgin, Joliet and Eastern Railroad Bridge or the CN Bridge. Prior to this structure there was a swing bridge at this location.
The current bridge was built in 1974. The builders are listed as the American Bridge Company or United States Steel. The structure is a Warren truss vertical lift bridge. Main span is 242 feet. There is one main span and two approach spans. The bridge is active.