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There are many things an engineer has to look for when designing a major structure such as the Tacoma Narrows Bridge.
On July 1, 1940 the Tacoma Narrows Bridge was open to traffic and was the third longest suspension bridge in the united state during the 1940's. It had a span of 5939 feet measuring the approaches. It had two towers of 425 feet tall that were connected to the bridge. During the design they picked that it should be a suspension bridge because it was only supporting cars which were much lighter then trains. Due to only have cars on the bridge they used shallow plate girders instead of trusses because they didn't cost as much and the bridge didn't need to hold as weight up...
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