 For about one mile (1.6 km), I-74 / US 6 forms the boundary of Davenport and Bettendorf.The two routes completely enter Bettendorf and descend into the Mississippi River valley, where they meet US 67 at a complex series of exit and entrance ramps.They then ascend the Iowa-Illinois Memorial Bridge, known locally as the I-74 Bridge, and cross the Mississippi River into Illinois.