On November 7, 1940, a twisting motion induced by vortex shedding during a 42-mile-per-hour windstorm led to the catastrophic failure of the bridge. The destruction of the original Tacoma Narrows Bridge was not a waste; it became a pivotal moment in engineering history.
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Engineers and observers watched as the roadway twisted and swayed, revealing a fundamental misunderstanding of the forces exerted by wind on lightweight, flexible structures. The journey to construction began with the Washington State Highway Commission, which spearheaded the project to connect the Olympic Peninsula with the mainland.
The design called for a narrow, two-lane deck suspended from two main cables, a configuration that prioritized slimness and flexibility over rigidity. While Leon Moisseiff's theoretical framework remained respected, the disaster prompted a global reevaluation of suspension bridge design standards.
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