11/7/1940: Only four months after its completion, the Tacoma Narrows Bridge in Washington State collapses.
November 7th, 2017‘…………The Tacoma Narrows Bridge opened with great fanfare on July 1, 1940. Human traffic across the waters of the Tacoma Narrows increased dramatically, but many drivers were drawn to the toll bridge not by convenience but by an unusual characteristic of the structure. When moderate to high winds blew, as they invariably do in the Tacoma Narrows, the bridge roadway would sway from side to side and sometimes suffer excessive vertical undulations. Some drivers reported that vehicles ahead of them would disappear and reappear several times as they crossed the bridge. On a windy day, tourists treated the bridge toll as the fee paid to ride a roller-coaster ride, and the Tacoma Narrows Bridge earned the nickname “Galloping Gertie.”….Experts still disagree on the exact cause of the bridge’s destruction, but most agree the collapse was related to resonance, a phenomenon that also comes into play when a soprano shatters a glass with her voice. In the case of the Tacoma Narrows, the wind resonated with the natural frequency of the structure, causing a steady increase in amplitude until the bridge was destroyed……..’