[Lady Heron]

A University of Minnesota Civil Engineer in a report to MN-DOT recently noted that this bridge is considered to be a non-redundant structure. That is, if any one member fails, the entire bridge can collapse

Nevermind, maybe it does make sense. Only have to take out one pylon to take out the whole bridge post 1919. LOL, I won't tell where I though was the best place to put explosives with an untrained mind and he found this info on the internet.

Just like I thought no demolition expert needed.

[wagglebee]

Superstructure Condition: Poor.
Substructure Condition: Satisfactory.
Scour: Foundations determined to be stable.
Bridge Railings: Meets currently acceptable standards.
Structural Evaluation: Meets minimum tolerable limits to be left in place as-is.

It also sounds like it was a disaster waiting to happen and if the work that was being done affected anything structural (which is entirely possible), then it could easily have resulted in this disaster.