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As a total layperson all I can add is that I've read that any time there's concrete with exposed and wet rebar that's an immediate "o shit". https://theconversation.com/the-problem-with-reinforced-conc...

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That is what I thought. I sent this picture of a bridge carrying I-95N to MassDot a year ago:

https://imgur.com/gallery/ZSMg1pZ

They cleaned up the chunks of concrete that had fallen from the beam.

Wow, that looks really bad.

Yikes--it looks even worse on Google Street View.[0] That appears to be bridge P-03-023.[1] According to MassDOT, it was built in 1959 and "reconstructed" in 2010--which apparently meant "replacing the bridge decks, ... and upgrading bridge and approach railings,"[2] not fixes to the part that appears to be disintegrating. It was last inspected in 2019.[1]

[0]: https://www.google.com/maps/@42.5194293,-70.9935589,3a,75y,3...

[1]: https://www.arcgis.com/home/webmap/viewer.html?url=https%3A%...

[2]: https://hwy.massdot.state.ma.us/ProjectInfo/Main.asp?ACTION=...

I like the explanation that concrete isn't set in stone so to speak: https://www.theguardian.com/science/2017/jul/04/why-roman-co...

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