I lived on Pittsburgh's Northside (and I sure had fun) and this flooding is not uncommon. For the most part it lies along the river. You'll notice the trains running across the river. Little of the infrastructure stops that I noticed. That one section of highway closed is called the "Bathtub" for good reason.
I saw the river so high when it was frozen gigantic chunks of ice, boats and docks were jamming on the underside of the bridges. It was stupendous.
I found Pittsburgh was one of the most photogenic, positive or not, cities in US.
Liberty Avenue 1936 (I believe all of these buildings are still in tact);
Liberty Avenue Flood 1936 by
jackftl, on Flickr
Interesting that if you go down the backside of Mt Washington and the high dollar rooms with views, across the river from Pittsburgh's very dense Downtown is like a scene from Butcher Holler.
Where worlds collide.