@Telsyst - You wouldn't get very far in a city like Pittsburgh or New York without the bridges they have. There is a reason that a lot of the stuff in Pittsburgh is called three rivers.
The problem with a lot of rivers, like in Pittsburgh and New York, is the lane closings. There is construction all the time in Pittsburgh. I think it is something I don't mind seeing too much though, better safe than sorry. If I was in the city daily I might have a different point of view.