🌉 THE BRIDGE THAT DANCED ITSELF TO DEATH
November 7
At 11:00 a.m. on November 7, 1940, the Tacoma Narrows Bridge — opened barely four months earlier — began to twist in a wind of only 42 mph, and the roadway rippled like a ribbon in a slow, terrible S-wave. Engineers called it "Galloping Gertie"; drivers had learned to time their crossings to its rhythm. That morning the motion grew until the whole 2,800-foot span tore itself apart and dropped, in one roaring sheet of concrete and steel, into the cold water of Puget Sound. A newsreel cameraman filming from the shore — and a dog trapped in an abandoned car on the deck — became the only casualties of the most famous engineering failure ever caught on film. The disaster rewrote the science of bridge aerodynamics forever.
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