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I was curious too and found this Reddit write-up:

https://www.reddit.com/r/UnresolvedMysteries/comments/6zr2d6...

Picture of the bridge. (I'm EU so couldn't view the previous link)

https://www.reddit.com/r/Seattle/comments/5ticw5/til_a_dange...

Here's a picture from that thread showing how it works and what it's like when it lets boats through: https://i.imgur.com/nIeXbXt.png. I skimmed a bunch of articles about the bridge to figure out how the bulge possibly worked to let boats through, and none were as useful as this diagram.

Ah that's a gem.

Oh now that is a very stupid design. Thanks for the picture!

Yet, it was replicated in Copenhagen (albeit for a bicycle path).

https://www.archdaily.com/868904/copenhagens-latest-piece-of...

I saw "The Unholy Trinity of Bridge Stupidity in Copenhagen" recently https://www.youtube.com/watch?v=McvZ68qlho4 and was shocked that this thing actually exists.

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