The northern portion of Decatur sits on top of a short hill that overlooks the Tennessee River; this creates a very steep dropoff to the river shore at Rhodes Ferry Park. This hill allows the "Steamboat Bill" Memorial Bridge to leave the mainland at grade without any major sloping required to cross the river while not interfering with Decatur's heavy barge traffic. This hill extends from the banks of the river about south to the 14th St./Magnolia St. intersection with 6th Avenue (US 31).