Cass Street Bascule Bridge

Title

Cass Street Bascule Bridge

Artist

John McArthur

Medium

Photograph - Photography / Digital Art

Description

Night view of the Cass Street Bascule Bridge in Joilet, IL. This bridge is one of four rare Scherzer rolling lift bascule bridges in Joliet.
http://historicbridges.org/illinois/cass/ad_large.jpg

These bridges have a similar truss design with double truss leaves that cantilever out to the center of the channel. The trusses follow a Pratt configuration. In this sense, they are similar to the trunnion bridges of downtown Chicago like the Clark Street Bridge in that the trusses have that unusual "U" shape that you see when these bridges are in the closed position. The rolling lift bascule bridges in Joliet differ visually from the trunnion bascules in Chicago in that the trusses are taller, and lead up to an overhead concrete counterweight that is present above the roadway rather than hidden below in a counterweight pit. These counterweights are held stable on the bridge via trussed towers. The key feature of the rolling lift bascule is the use of a roller and track upon which the bridge rolls to open rather than rotating around an axel as a trunnion bascule bridge does. The rolling lift action is very visible on these bridges, and you can easily see the part that the bridge rolls on directly below the counterweight. These bridges have unusual cantilevered plates of steel that hold electrical wires and allow them to span across the river above the bridge. This design limits the height of boats that can pass under the bridge. This was not an issue as the taller Great Lakes freighters and tall sailboats never came down this section of river. Most of the bascule bridges in Joliet have beautiful overhead arches that appear at the center of the bridge and at the approach to the bridge. These were for cable-cars/trolleys that once would have crossed the bridge. Chicago's bascule bridges once had supports for this purpose but they have all been removed. These supports remain in place here in Joliet, a testimony to a long-lost type of transportation in this region.

With riveted, built-up beams on the bascule bridges, v-lacing and lattice can be found on select parts of the bridges. Connections on the bridge are all riveted. The bridge-tenders houses are original, and are not as fancy and ornate as the downtown Chicago bridges, but are still tastefully designed to look nice. The bridges retain original railings that have a decorative design to them. These bridges continue to operate for boats, mostly barges, as needed.

Uploaded

May 17th, 2016

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Viewed 67 Times  -  Last Visitor from White Plains, NY on 04/13/2024 at 9:14 PM

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