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Former route of Iowa 141; now County Roads E60 and N33 Iowa 162: 2.660: 4.281 Pammel State Park: Iowa 92 in Madison County: 1930: 1982 Park access road; renumbered Iowa 322 to avoid confusion with nearby US 169 Iowa 162: 2.0: 3.2 US 18 in Charles City: US 218 in Charles City 2000: 2006
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
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).
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
The Iowa Department of Transportation maintains a system of state highways, usually called Iowa Highways. Within the State of Iowa, state route markers consist of a white circle against a black background, with a black route number in the center. U.S. and Interstate highways are also classified as state highways in Iowa.
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]
Iowa Highway 2 (Iowa 2) is a 251-mile-long (404 km) state highway which runs across the southernmost tier of counties in the U.S. state of Iowa. At no point along its route is Iowa 2 more than 15 miles (24 km) from the Missouri state line, except for a small section near its eastern terminus.
U.S. Highway 18 (US 18) is the northernmost east–west United States Numbered Highway in the state of Iowa. As with all state highways in Iowa, it is maintained by the Iowa Department of Transportation (Iowa DOT). It enters the state by crossing the Big Sioux River between Inwood and Canton, South Dakota.