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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).
Route map Interstate Highways of the Iowa Primary Highway System ... Interstate Highways of the Iowa Primary Highway System; Highway markers for I-80, I-380, and I-35 ...
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 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.
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
Once the U.S. Highway System was established, the automobile association-sponsored roads gradually disappeared. [8] A map of Iowa's U.S. Highways as laid out in 1926. The new US 63 entered Iowa near Bloomfield and traveled north through Ottumwa to Oskaloosa. There it turned to the northwest to go through Pella, Monroe, and Prairie City.
The current Iowa 1 was designated in the 1926 Iowa highway renumbering, extending from Iowa 3 near Keosauqua to US 32 in Iowa City as a renumbering of a portion of Primary Road No. 11. [3] Iowa 3 was renumbered Iowa 2 in 1941 to match Nebraska's highway. In 1930, it extended east to Iowa 38 in Rochester; it replaced Iowa 139. [4]
Work on modernizing Iowa's highway system began in the 1950s, mostly by straightening and widening the original highways built in the 1930s. [ 13 ] [ 14 ] By the end of the 1950s and into the 1960s, sections of US 34 were identified as parts of important corridors that required expansion to four lanes.
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