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Interstate Highways of the Iowa Primary Highway System; Highway markers for I-80, I-380, and I-35 Bus. Loop. Interstate Highways in Iowa highlighted in red.
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
Interstate 29 in Iowa; Interstate 129; Interstate 35 in Iowa; Interstate 35 Business (Ames, Iowa) Interstate 35 Business (Clear Lake, Iowa) Interstate 235 (Iowa) Interstate 335 (Iowa) Interstate 74 in Iowa; Interstate 80 in Iowa; Interstate 280 (Iowa–Illinois) Interstate 380 (Iowa) Interstate 480 (Nebraska–Iowa) Interstate 680 (Nebraska–Iowa)
Originally a spur route from Iowa 2/Iowa 24 (now US 6) to Griswold, this became part of Iowa 48 in 1923; east-west route designated 1921 when Iowa 24 was decommissioned through Lewis, replaced by relocated Iowa 92 Iowa 100: 6.12 [16] 9.85 US 6 near Lewis: US 71 near Atlantic: 1958: 1958
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).
List of Interstate Highways in Iowa; S. List of state highways in Iowa; U. List of U.S. Highways in Iowa This page was last edited on 3 June 2022, at 19:32 (UTC). ...
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.
There are 71 primary Interstate Highways in the Interstate Highway System, a network of freeways in the United States. These primary highways are assigned one- or two-digit route numbers, whereas their associated auxiliary Interstate Highways receive three-digit route numbers. Typically, odd-numbered Interstates run south–north, with lower ...