I don't think that something has to be strictly "technical" to be on HN. I would like to see the the story on how the bridge came to be in the state it is in on HN - not just the technical explanation for what happened, but why did we choose to allocate our resources in such a way that the failure occurred.
Comments on reddit mentioned that the bridge was condemned in 1992, and repeatedly since then, but no one bothered to fix it. I thought we had a big goverment stimulus package for shovel-ready projects over the past few years...