St. Charles Air Line Bridge

The St. Charles Air Line Bridge is a Strauss Trunnion bascule bridge which spans the Chicago River in Chicago, Illinois.
Built as part of the St. Charles Air [Line Railroad] by the American Bridge Company in 1919, the bridge originally had a span of. This bridge held the world record for longest bascule-type span until 1930, when it was shortened to during a relocation as a result of straightening the river channel. The chief design engineer of the original bridge was Leonard O. Hopkins.