The most elegant bridge in America opened in July 1940. By November, 40 mph winds had twisted it to pieces — and the only casualty was a dog named Tubby.
The Tacoma Narrows Bridge in Washington State opened on July 1, 1940, and was celebrated as one of the most beautiful suspension bridges ever built. Designed by Leon Moisseiff, its slender, graceful deck saved money on materials — but made it dangerously flexible.
Almost immediately, the bridge began to ripple and sway in moderate winds, earning the nickname 'Galloping Gertie.' The movement was so extreme that workers on the bridge reported seeing oncoming cars disappear into the waves of the deck before reappearing again. Some drivers refused to cross; others found it thrilling.
On November 7, 1940 — just four months after opening — a 40 mph wind caused the bridge to oscillate with increasing violence until it began twisting catastrophically. The central span tore itself apart and plummeted into Puget Sound. The whole event was captured on film, making it one of the most-watched structural failures in history.
The collapse was not caused by simple resonance, as physics textbooks long claimed. Engineers later established that the failure resulted from 'aeroelastic flutter' — a complex self-reinforcing interaction between wind and the bridge's twisting motion that fed on itself until the structure gave way.
The only casualty was a cocker spaniel named Tubby, who belonged to a man who had fled his car as the bridge collapsed. He refused to leave the dog behind and returned multiple times to try to rescue him — but the violent swaying made it impossible. Tubby went down with the bridge.
The Tacoma Narrows disaster revolutionized bridge engineering worldwide. Wind tunnel testing became mandatory for major bridge designs, and aerodynamic considerations that Moisseiff's era had largely ignored were built into every subsequent suspension bridge. The old bridge's concrete deck still lies on the bottom of Puget Sound, now a protected artificial reef.