Van Buren Street Bridge

(Bridge Hunter, Historic Bridges, Chicago Loop, Satellite)

Some of the previous bridges

When I got the satellite link, I noticed they were working on the bridge again so I saved that image.

3D Satellite

Chicago Loop Bridges explains that the new bridge was built while the old one was still operational.
From the 1955 Chicago Public Works Annual Report

Chicagology and Historic Bridges

Just love posted
Van Buren Street, Chicago (1949)
[If you enjoy reading platitudes, then use the link to access the rest of the description.]

Today we still have the 1956 trunnion bridge.

Street View

Now they just closed it for months for auto traffic. At least they are trying to keep the pedestrian crossing open most of the time because of the Union Station commuter traffic that uses it.