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This bridge is an example of an older Calumet Sag Channel through truss. As an older bridge it uses only rivets and no bolts, and also uses v-lacing and lattice extensively on its built-up beams. These aspects give the bridge a superior geometric beauty to the many later truss bridges crossing the waterway. This bridge carries heavy traffic but remains in good condition overall. It appears that the piers were altered with supplemental supports that extend behind the piers, perhaps to prevent the piers from rotating into the channel over time. The approach spans have been replaced with pre-stressed stringer spans. The through truss span retains good historic integrity however.
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Main Plaque STATION 297 - 50BUILT 1932 BY STATE OF ILLINOIS BOND ISSUE ROUTE 49 SECTION 146 - B2 |
Rehabilitation Plaque STATION 1+000.000REBUILT 1997 BY STATE OF ILLINOIS F.A.U. RT. 2857 SEC. 146 (B&C) 2 R-1 F.A. PROJ. ACDPU-DPU-STPM-0016(3) LOADING MS18 STR. NO. 016-0294 |
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Chicago River Bridges - By Patrick T. McBriarty, this is a great companion to Holth's book shown above. This much larger book offers an extremely in-depth exploration of Chicago's movable highway bridges, including many crossings that have not existed for many years. Order Now Direct From The Publisher! or order on Amazon.
View Historic American Engineering Record (HAER) Overview of Chicago Bascule Bridges (HAER Data Pages, PDF)
Chicago Loop Bridges - Chicago Loop Bridges is another website on the Internet that is a great companion to the HistoricBridges.org coverage of the 18 movable bridges within the Chicago Loop. This website includes additional information such as connections to popular culture, overview discussions and essays about Chicago's movable bridges, additional videos, and current news and events relating to the bridges.
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