US 30 continues east as an expressway, passing DeWitt to the south. east of DeWitt, it crosses back over to the north side of the Overland Route. West of the Clinton city limits is an interchange with Clinton County Road Z36 (CR Z36), which serves Low Moor and as a shortcut to southbound US 67. East of CR Z36, it passes the Clinton Municipal Airport and a large chemical plant. As it approaches Mill Creek Parkway, it descends over in elevation into the flat Mississippi River valley, where it meets US 67. US 30 / US 67 head east along Lincoln Way and ascend onto a plateau, atop which reside stores and restaurants. As they continue east, the two routes split into one-way streets, eastbound Liberty Avenue and westbound Camanche Avenue. The one-way street alignment ends at 11th Avenue South, but quickly begins again as US 30 / US 67 turn to the north onto northbound South Third Street and southbound South Fourth Street. At Eighth Avenue South, US 30 splits away from US 67 and onto the Gateway Bridge and crosses into Illinois.