Built in 1909, this bridge is the only remaining single leaf Chicago bascule bridge from what is called the "first generation" design that is a through truss. All the other such bridges are double-leaf. Indeed, single-leaf bascule bridges are extremely rare among the movable highway bridges in Chicago, nearly all are double-leaf. In contrast, railroad bascule bridges are nearly always single leaf including the historic railroad bascule bridge that sits next to the Kinzie Street Bridge.
Kinzie Street was the site of the first river bridge in the Chicago area. It was a foot bridge completed in 1832, reportedly built to provide better access to a tavern. The next bridge was built in 1870 by Fox and Howard and was a hand-turned iron/wood combination swing bridge that was 170 feet long and 31.5 feet wide.
When time came to replace the old 1870 swing bridge at this location, a temporary bridge was built and opened to traffic December 11, 1907. By December 16, work to remove the old bridge had begun. Construction of the bridge seen today started with the driving of the substructure piles on January 23, 1908. By September 26, 1908 the substructure was completed to the point that superstructure erection could begin, although superstructure erection did not begin until October 15. The superstructure was completed and the bridge opened to traffic May 10, 1909. The bridge substructure was essentially complete by November 13. The substructure cost $99,058.57. The superstructure cost $100,691.73. The total cost of the entire bridge was $218,707.86. John J. Gallery was listed as the superstructure contractor, while the substructure contractor was Great Lakes Dredge and Dock Company.
Approximately three quarters of this bridge has been replaced, but replaced in-kind using built-up beams that have been specially made to replicate the original elements of the bridge. The portion that replaced was that portion that is opposite the mechanics of this single-leaf bascule bridge, the front portion seen in the above photograph, which was taken facing eastward. While the primary goal with any historic bridge should be to preserve as much original material as possible, whenever something is replaced, it should be the goal to replace in-kind with as accurate a replica as possible. While it would be nice to see a greater quantity of original material on this bridge, this is nevertheless a good example of how a bridge beyond repair or nearly beyond repair might still be able to display the features which give it historic value. The only major shortcoming of the replacement is that standard high strength bolts were used instead of rivets. If rivets were used it appears it would be a perfect replication. From an aesthetic standpoint, the city could have partially simulated the appearance of rivets by using round head bolts which would make the bolts look more like rivets than the hex heads on the standard bolts the city used.
The photo below shows the rehabilitation/reconstruction of the bridge, specifically where the replicated section of the bridge is being put into place with assistance of a barge.
Above: This photo showing the heavy rehabilitation and reconstruction shows the portion of the bridge that is either completely or nearly completely made of new materials, which is the bascule leaf, being floated into place on a barge.
Above: When researching this bridge, you may come across historical photos (like the one seen in the advertisement and photo above) which show a mysterious bobtail swing bridge a short distance north of the Kinzie Street Bridge. This was the Chicago, Milwaukee, and St. Pail Railway Bridge, and this bridge and section of railroad line no longer exist.
Above: Photos from 1960 showing the interior of the bridge tender house.
Above: A photo of the bridge as it appeared in 1949.
Above: This photo showing bridge construction at a point where the bascule leaf is complete, but the deck is still being installed.
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This bridge is tagged with the following special condition(s): Unorganized Photos
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