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This bridge is a cantilever truss bridge which includes a system of anchor arms and cantilever arms holding a suspended span. Visually, this bridge is a variety of cantilever truss that eliminates the pointy towers commonly found in cantilever through truss bridges, and also visually hides the suspended span. The intent was to create a more aesthetically pleasing truss, and also one in which the trusses were above the roadway over the navigation channel so as to increase clearance for boats. This variety of cantilever truss is often called an "arched cantilever" because its trusses form an arch-like shape. The design is similar to "suspended deck cantilever trusses" except that the truss does not rise so far above the deck so as to require a suspension system. The truss layout of the arched cantilever design was also sometimes used in rigid continuous trusses (ie examples without hinges and suspended spans). Both arched continuous trusses and arched cantilever trusses are uncommon bridge types, and most early examples date to the 1930s. Constructed in 1938, the Trammell Bridge is part of this group of early arched trusses.
The Trammell Bridge is also noteworthy for its overall size. The bridge includes an extensive curved approach system consisting of simple span deck truss spans and steel stringer spans. Finally, the bridge is also noteworthy as a major project associated with Depression-era relief programs.
In 1998, a new bridge was built next to this bridge, to form a one-way couplet of bridges with the historic bridge carrying westbound traffic.
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