The Wells Street Bridge is one of the most iconic bridges in Chicago, making appearances in film and TV often.
The bridge is one of the most unique structures in Chicago, and one of only two that is a double deck structure.
The lower deck of the structure carries Wells Street, while the upper deck carries CTA "L" Trains.
This fixed trunnion bascule bridge is one of the finest in Chicago, joining the ranks of many other bridges, such as the Lake Street Bridge.
The bridge is a double leaf style trunnion bascule bridge, with each leaf containing 8 riveted panels.
In addition, the bottom chords are curved on either end to allow the bridge to raise and lower, meaning the clear span of the river is only 184 feet, as the sides are much too low for navigation.
The substructures are made of stone and concrete, which include an ornate cut stone abutment, operators tower and stairs to the river walk on the south side.
In addition, the railroad deck contains an 11 panel, riveted Warren Pony Truss approach on the south side. One oddity about the approach span is the fact it does not contain any verticals between panels. This pony truss connects directly to an 1890s elevated viaduct, part of the CTA.
Being located in downtown Chicago, with a large system of waterways; the bridge will raise and lower many times per day. Because of how massive the structure is, it is really unique to see how the bridge moves. The trunnion feature forces the bridge to pivot as it is being raised.
The previous bridges at this location also have a lot of history. The first wooden floating bridge was built in 1840, and was destroyed by ice and replaced in 1849, again being replaced in 1856 and 1862. After the 1862 structure burned in the Great Chicago Fire of 1871, an iron swing bridge would be constructed. Another would be built in 1888, which was converted to a double deck bridge in 1896.
The current bridge was constructed without interrupting traffic, similar to the Lake Street Bridge. Chicago Engineer of Bridges Thomas Pihlfeldt marveled at this fact, and considered it to be his greatest achievement.
In 2013, the Chicago Department of Transportation (CDOT) opted to rehabilitate this historic bridge, instead of replace. Part of the rehabilitation included:
Replacing outer panels of each leaf, roadway stringers, bracing and the bottom chord and replace non historic railing with historic replica.
In addition, rehabilitating the bridge house, mechanical systems, substructures, and the architectural elements of the bridge.
The 5 outermost panels on each leaf would be floated into place, and put into place. These new panels replicated every detail of the original ones.
Work was completed very rapidly, with minimal closures to traffic. Work would be completed in November 2013.
Overall, the bridge appears to be in good condition, and has little notable deterioration.
The author has ranked this bridge as being highly significant, due to the unique design.
The photo below is the builders plate. Below is a set of detail photos.
The photo above is an overview.
| Upstream | State Street Subway |
| Downstream | Lake Street Bridge |
