On Aug 2, 1:50?pm, Gregory Morrow wrote:

> There is a famous case of a newly - built bridge
> collapsing in the Pacific Northwest around 1940.
> IIRC it was a suspension bridge and the wind set up
> harmonic vibrations that eventually collapsed it. It
> was a big deal at the time, you may have seen newsreel
> footage of it...

Tacoma Narrows bridge. It was eventually rebuilt. A
new, second suspension span was opened recently.