There are single-leaf bascule bridges, which were constructed where the river was not very wide and often used for trains, and double-leaf bascule bridges, which could be compared to two seesaws across from each other.After 1910, involvement from the Chicago Plan Commission and architect Edward Bennett improved the bridges’ architectural elements, including bridge houses. It is unknown at this time when the bridges will be lowered.“The trucks are staged at various locations to help usmanage potentially large crowds,” a city spokeswoman said. Those grumbling should take note, however, that the bridges used to lift much more frequently than they do today.
In 1863, the Rush Street bridge actually collapsed under the weight of a herd of cattle being driven over it, further proving that the bridges were unstable and impractical.
Constructed of timber, it was similar to bridges found over moats at medieval castles, with large chains lifting it. Bascule bridges were the most practical for these large and growing numbers of people and remain common today.Some of the bridges that are still utilized in the downtown area are double decker, with vehicle traffic on the bottom level and L trains passing through on the upper level. The stunning architecture and skyscrapers give us plenty of reasons to look up, but next time you cross the river along Michigan Avenue, State Street, Wells Street or Wabash Avenue, look down. Today, the Main Stem of the Chicago River flows west from Lake Michigan to Wolf Point, where it converges with the North Branch to form the South Branch, which flows southwest and empties into the Chicago Sanitary a… NBC 5’s Lisa Chavarria has the story. Don't miss a thing.
One of the few remaining swing bridges can be found east of Cicero Avenue across the Chicago Sanitary and Ship Canal.Every day, Chicagoans head downtown, traveling to and from work, shopping, dining and generally navigating the area. In the 19th Century and part of the 20th Century, bridges were lifted or spinned on demand, whenever a boat needed to pass by. “It is standardpractice for CPD to put public safety protocols in place, including managingand redirecting the flow of vehicular traffic in order to ensure the safety ofparticipants during large-scale events and protests.”Numerous protests took place in Grant Park Saturdayafternoon, with marches making their way through the city during the eveninghours. After another day of protests and rallies across the city of Chicago, several bridges were left raised over the Chicago River to limit access into the downtown business district. In 1830, right around the time of the first movable bridge design, the city’s population was about 4,000. The Chicago River system flows 156 miles (251 km) from Park City (north) to Lockport (south); some 45 bridges span the river. The Scherzer rolling lift bridge is similar to a rocking chair, with large counterweights above the road level to help balance the bridge as it opens and closes.Chicago is not just home to many of the world’s earliest skyscrapers—it’s also a city of bridges. Translated from French, “trunnion” means “pivot point” and “bascule” means “seesaw.” Also known as the “Chicago Style,” the bridge's leaves are suspended on axles (trunnions), with massive concrete counterweights located below the bridge, in the riverbank pit. When it followed its natural course, the North and South Branches of the Chicago River converged at Wolf Point to form the Main Stem, which jogged southward from the present course of the river to avoid a baymouth bar, entering Lake Michigan at about the level of present-day Madison Street. In the years that followed, there was much trial and error as new styles were designed.
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