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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
Section from US 20 to Holstein replaced by realigned US 59; rest given to county because US 59 was realigned Iowa 131: 4.520: 7.274 Iowa 21 in Belle Plaine: US 30 near Belle Plaine 1937: 2003 Part of the Lincoln Highway; now County Road V40 Iowa 132: 5.74 [19] 9.24 I-35 / I-80 in Des Moines: Iowa 90 (now US 6) in Des Moines
The primary highway system makes up over 9,000 miles (14,000 km), approximately 8 percent of the U.S. state of Iowa's public road system. 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.
I-129 / US 20 / US 75 at Sioux City: I-29 / US 20 / US 75 at Sioux City 1976: current I-235: 14.585: 23.472 I-35 / I-80 at West Des Moines: I-35 / I-80 at Des Moines: 1961: current I-280: 9.862: 15.871 I-80 / US 6 at Davenport: I-280 at Rock Island, Ill. 1973: current I-380: 72.969: 117.432 I-80 / U.S. Route 218 / Iowa 27 near Coralville
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.
Lincoln Highway Bridge (Tama, Iowa) List of state and territory name etymologies of the United States National Register of Historic Places listings in Adair County, Iowa
Within the route log, "U.S. Route" is used in the table of contents, while "United States Highway" appears as the heading for each route. All reports of the Special Committee on Route Numbering since 1989 use "U.S. Route", and federal laws relating to highways use "United States Route" or "U.S. Route" more often than the "Highway" variants.
The United States Numbered Highway System is an older system consisting mostly of surface-level trunk roads, coordinated by the American Association of State Highway and Transportation Officials and maintained by state and local governments. U.S. Highways have been relegated to regional and intrastate traffic, as they have been largely ...