South of Bertram, the two routes cross the Cedar River before US 151 splits away from US 30 to the north at a trumpet interchange. This interchange is the southern end of Iowa 13. The road dips southeast, ultimately bypassing the cities of Mount Vernon and Lisbon. Over the next , US 30 passes through a small town every . In Cedar County it passes through Mechanicsville, Stanwood, Clarence and Lowden. In Stanwood, it is overlapped by Iowa 38 for . In Clinton County, it passes through Wheatland, Calamus, and Grand Mound before reaching a full cloverleaf interchange with US 61 at DeWitt. US 30 overlaps US 61 for , crossing the Union Pacific Overland Route in the process, and leaves US 61 via a trumpet interchange.