Looks a bit over-sharpened but the DOF is just right for giving an impression of depth, IMHO. Did you also try in landscape format to include more of the bridge?
I read a tutorial yesterday where dramatic appearances can be gotten by raising or lowering the camera and I'm thinking that this bridge with it's interesting wall detail might be shot with the cam much closer to the ground making the walls look, like, 20 ft tall, coming in from almost the top of the frame sides (or even the actual top of the frame) with a viewpoint down in the lower 1/3 of the frame. A dog's-eye view, so to speak.