>> There is a bridge in Flint where the support pillars are held together by giant steel clamps because the concrete is crumbling underneath them.

They've been replacing a bunch of bridges on I-94 in Detroit. Many of them had lots of rebar showing on the pillars where the concrete had crumbled a way. Not just a bar showing, but a decent sized grid. It doesn't surprise me that a pedestrian bridge got overlooked with all the road bridges in need. Still no excuse.