Pittsburgh's bridges falling down

Business on the South Side are taking a hit from the Birmingham Bridge closing. I wonder how much money they've lost? Given the sorry state of bridges and other infrastructure (remember this?) in Pennsylvania and nationwide, you'd have to multiply that figure by thousands -- at least -- to get some sense of the economic impact of this collective neglect. That would also give you some idea of the payoff were public funds invested in infrastructure repair, rather than in convention centers, arenas and luxury condos.