One would never know (unless you'd been there yourself) that the Mighty Mississippi is between the pole and the Arch. I've honestly not seen the Arch from this view. Well done on the preciseness of your composition.
I am enjoying your composition of the iconic arch, here in the Gateway City. :) I have been meaning to get over on the IL side for a long exposure shot, but have not investigated locations. Super composition... very precise. :) A fav, naturally!