I think part of this is because the Delaware is wide enough to be a divider - you can't comfortably walk across it, for example. (If I recall correctly only on

I think part of this is because the Delaware is wide enough to be a divider - you can't comfortably walk across it, for example. (If I recall correctly only one of the Philadelphia-area bridges even has pedestrian access.) The Schuylkill, on the other hand, is easy to cross.