The first 10-mile-long (16 km) section of the route that stretched from Cumming to Urbandale was opened on September 21, 1958. Shortly after, US 18 splits off to the west in Clear Lake, while Iowa 27 runs with I-35 until they reach the Minnesota state line.Ĭonstruction of I-35 in Iowa took place over 17 years. Near Mason City and Clear Lake, US 18 and Iowa Highway 27 (Iowa 27) overlap with I-35. I-235, the only auxiliary route of I-35, serves the suburbs and downtown Des Moines it begins and ends at the two interchanges where I-35 and I-80 meet.

In the Des Moines area, I-35 runs concurrently with I-80, and the two highways bypass Des Moines to the west and north. It enters the state near Lamoni from Missouri and continues north through the southern Iowa drift plain. In Iowa, the highway runs from south to north through the center of the state, roughly parallel to U.S. Interstate 35 ( I-35) is a north–south Interstate Highway in the United States that runs from Laredo, Texas, to Duluth, Minnesota.

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