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Galloping Gertie
A staple in engineering textbooks, construction workers nicknamed the first Tacoma Narrows Bridge, “Galloping Gertie” during construction.
Shortly after opening, Galloping Gertie, the 3rd longest suspension bridge in the world, fell 200 feet into the river below.
Gertie took 3 cars down, but all the occupants of the car escaped without harm.
... "Bridge engineering is not, as popularly assumed, an exact science. While ordinary structures are closely controlled by ample experience and experiments, every structure which projects into new and unexplored fields of magnitude involves new problems, for the solution of which neither theory nor practical experience can furnish an adequate guide."
Othmar Hermann Ammann, Swiss-American Civil Engineer and member of the Federal Works Agency Commission that investigated the collapse.
A key advancement, stemming from this incident, was the development of box girder bridges, incorporating aerodynamic design, that we see today.
"I thought she would be able to fight it out. I was the only person on the Narrows Bridge when it collapsed ...
at least six lamp posts were snapped off while I watched. A few minutes later, I saw a side girder bulge out. But, though the bridge was bucking up at an angle of 45 degrees, I thought she would be able to fight it out. But, that wasn't to be.
"The bridge dropped from under me. I fell and broke one of my cameras. The portion where I was had dropped 30 feet when the tension was released. I kneeled on the roadway and stayed to complete the picture."
F.B. Farquharson, Professor of Engineering, University of Washington