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The Interstate 74 Bridge carrying I-74 across the Mississippi River I-80 in western Iowa near Walnut Traffic congestion on I‑35 / I‑80 during the Iowa flood of 2008
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).
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
Originally a spur route west to Thurman; extended west in 1980; now County Road J24 Iowa 146: 42.735: 68.775 US 63 / Iowa 102 in New Sharon: US 30 in Le Grand: 1926: current Iowa 147: 6.706: 10.792 Rockford: Iowa 14 in Floyd County: 1926: 2003 Spur route, former Iowa 53; now County Road B45 Iowa 148: 66.828: 107.549
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)
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Endpoints at highways in unincorporated areas Iowa Highway 1: US 151 near Anamosa Endpoints at state lines, continuing as numbered highway U.S. Route 20 in Iowa: US 20 at the Illinois state line Endpoints at unnumbered (town/city/county) roads in minor town/city limits Iowa Highway 85: Montezuma city limits
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.