East of the Dayton Avenue interchange is I-35, which connects US 30 to Minneapolis, Minnesota, to the north, and Des Moines to the south. Continuing east, the expressway travels to Nevada, more to the US 65 interchange at Colo, to State Center, and the Iowa 330 interchange on the western edge of Marshalltown. to the east are two half-interchanges with U.S. Route 30 Business (US 30 Business). US 30 bypasses Marshalltown approximately south of its business loop. Near Marshalltown Community College, it intersects Iowa 14 at a diamond interchange. The 18th Avenue interchange on the southeastern side of Marhsalltown is the eastern end of the business loop. From Marshalltown, it travels to Le Grand, crossing over the Overland Route rail corridor on the west side. It bypasses Le Grand to the north, where it intersects the northern end of Iowa 146 at a diamond interchange. Continuing east, the highway enters Tama County. It rises over a large hill north of Montour and then descends into the Iowa River valley.