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.
The National Bridge Inventory lists this bridge with a 1967 construction date while the plaque says 1970. This suggests that for some reason it took an unusually long three years to build this bridge.
Like other Calumet Sag Channel bridges, this fixed truss bridge was designed such that, as indicated in the original plans for the bridge, the structure could be converted to a vertical lift bridge by the addition of towers in the future if increased clearance for boats was ever needed in future years. This need has never presented itself however, so these changes have never taken place. The plans for this bridge also highlight how narrow the Calumet Sag Channel used to be in terms of width, and how much wider the channel is today. Both the original and current dimensions of the channel are shown in the plans. The construction of this bridge most likely was required to accommodate the construction of this much wider channel.
Main PlaqueRIDGELAND AVENUE BRIDGE
CALUMET SAG CHANNEL
BUILT 1970 BY
COUNTY OF COOK
[REMAINDER OF PLAQUE UNREADABLE]
Complete Bridge List
Chicago and Cook County are home to one of the largest collections of historic bridges in the country, and no other city in the world has more movable bridges. HistoricBridges.org is proud to offer the most extensive coverage of historic Chicago bridges on the Internet.
General Chicago / Cook County Bridge Resources
Chicago's Bridges - By Nathan Holth, author of HistoricBridges.org, this book provides a discussion of the history of Chicago's movable bridges, and includes a virtual tour discussing all movable bridges remaining in Chicago today. Despite this broad coverage, the book is presented in a compact format that is easy to take with you and carry around for reference on a visit to Chicago. The book includes dozens of full color photos. Only $9.95 U.S! ($11.95 Canadian). Order Now Direct From The Publisher! or order on Amazon.
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.
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.
Additional Online Articles and Resources - This page is a large gathering of interesting articles and resources that HistoricBridges.org has uncovered during research, but which were not specific to a particular bridge listing.
Coordinates (Latitude, Longitude):
Search For Additional Bridge Listings:
© Copyright 2003-2022, HistoricBridges.org. All Rights Reserved. Disclaimer: HistoricBridges.org is a volunteer group of private citizens. HistoricBridges.org is NOT a government agency, does not represent or work with any governmental agencies, nor is it in any way associated with any government agency or any non-profit organization. While we strive for accuracy in our factual content, HistoricBridges.org offers no guarantee of accuracy. Information is provided "as is" without warranty of any kind, either expressed or implied. Information could include technical inaccuracies or errors of omission. Opinions and commentary are the opinions of the respective HistoricBridges.org member who made them and do not necessarily represent the views of anyone else, including any outside photographers whose images may appear on the page in which the commentary appears. HistoricBridges.org does not bear any responsibility for any consequences resulting from the use of this or any other HistoricBridges.org information. Owners and users of bridges have the responsibility of correctly following all applicable laws, rules, and regulations, regardless of any HistoricBridges.org information.