I’ve always heard that bridge being called “Bouncing Betty.” Had family out there, two uncles were stationed there in WWII and liked it so they stayed. One of them had been on that bridge before when it went off, not the final time when it collapsed, though. He talked about it a lot, must’ve been very memorable.
That's cool you had family who actually experienced it. Must have been incredible to see. The video link below is super...lot of different vids collected into this one:
Watch "Gallopin' Gertie" in Action