This bridge is one of several truss bridges on the Calumet Sag Channel that date to the 1960s. They are noted for having built-up beams held together by rivets but having all connections being bolted. There also are some welded details. While not very old or overly significant, they are more visually attractive than any modern bridge could hope to be. In addition, these bridges are quite important in conveying the final chapter in the story of the historic metal truss bridge. The use of rivets only on the built-up beams in these 1960s bridges represents the final years of the use of rivets in metal truss (and any type of metal bridge) construction. Already at this time, historical techniques like using lattice and v-lacing on built-up beams had been largely abandoned. By the 1970s, rivets were abandoned completely. After around 1970, metal truss bridges might be built occasionally for specialized situations, but were largely abandoned as a bridge type considered for a new bridge project. In addition, any truss bridges built after approximately 1970 no longer used rivets, ending a historical construction method that had been used essentially since the beginning of metal bridge construction in the United States. The elimination of this final historical construction technique by 1970 is largely why HistoricBridges.org has set 1970 as the general cutoff date to consider a bridge for historical significance and inclusion in the Bridge Browser.
This particular bridge stands out among the group since it is actually two identical bridges side by side forming a one-way couplet. The bridges serve a divided highway.
Main Plaque (On Southbound Bridge)96TH AVE. HIGHWAY BRIDGE
BUILT 1967 BY
STATE OF ILLINOIS
S. B. I. ROUTE 51 - F. A. ROUTE 45
SECTION 511 - B - C - R
Rehabilitation Plaque (On Southbound Bridge)STATION 1+688.653
REBUILT 2001 BY
STATE OF ILLINOIS
F. A. P. ROUTE 330 SECTION 511B - C - R - 1
F. A. U. PROJ. ACBHF - 330 (26)
LOADING MS 18
STRUCTURE NO. 016 - 0343 (SB)
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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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