I asked Bad Tim what went wrong:
Modernists were jumping all over each other to create a sleeker, more streamlined suspension bridge, and this one was the absolute masterpiece. Unfortunately, they neglected to account for the heavy winds thru the narrows and didn't realize that they would create a resonance in the span. it was like striking a tuning fork. Once the vibration got started, the wind kept feeding it until it started swaying like that.
This is why suspension bridges are often double-deckers or have deep, open trusses under their decks. It makes the deck stiffer so it won't oscillate a lot of them also use grates for the deck instead of concrete, so the wind can blow thru without setting off the wave action.
It was a gorgeous bridge, though, wasn't it? It's tragic about the dog.
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