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Number Length (mi) [2] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes I-80N: 17.102: 27.523 I-29 at Loveland: I-80 near Neola: 1966
Spur route; originally began at Iowa 8 (later US 34) east of Agency, but was shortened to Iowa 16 near Douds in 1942 (this section became Iowa 16); now County Road V64 Iowa 99: 33: 53 US 30 near Camanche: US 61 in Davenport: 1920: 1931 Replaced by US 55 (later US 67) Iowa 99: 33.232: 53.482 US 34 in Burlington: US 61 in Wapello
The Iowa Department of Transportation is responsible for the day-to-day maintenance of the primary highway system, which consists of Interstate Highways, United States Highways, and Iowa state highways. Currently, the longest primary highway is U.S. Highway 30 at 332 miles (534 km). The shortest highway is Interstate 129 at 0.27 miles (430 m).
U.S. Highway 20 (US 20) in Iowa is a major east–west artery which runs across the state, separating the northern third of Iowa from the southern two-thirds. It enters Iowa from Nebraska , concurrent with Interstate 129 (I-129) and US 75 , crossing the Missouri River at Sioux City .
United States Numbered Highways of the Iowa Primary Highway System Highway markers from different years for former US 32 (1926), US 75 (1961) and current US 151 (1971) U.S. Highways in Iowa highlighted in red
All three sections were originally kept as state highways, but, in 1991, when Iowa DOT first showed the new state highways' designations on the state highway map, the central section already had been turned over to Polk and Jasper counties. The western segment was numbered Iowa 925 and the eastern segment Iowa 927. [41]
In 1920, the Iowa General Assembly enacted a primary road bill that shifted maintenance of highways in the state from associations to Iowa's 99 counties. At this time, the Davenport -to- Dubuque branch of the Mississippi Valley Highway, as the Burlington Way as known by then, was designated Primary Road No. 20. [ 6 ]
Interstate 35 (I-35) is a north–south Interstate Highway in the United States that runs from Laredo, Texas, to Duluth, Minnesota. In Iowa , the highway runs from south to north through the center of the state, roughly parallel to U.S. Highway 69 (US 69) and US 65 .