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Serves the Mason City area US 18 Bus. 4.149: 6.677 US 18 / Iowa 76 near McGregor: US 18 / Iowa 76 in Marquette: 1989: current Serves McGregor and Marquette; former routing of US 18 US 20 Bus. — — US 77 / US 20 Bus. at South Sioux City, Neb. US 20 / US 75 at Sioux City: 1979: current Serves Sioux City area; former routing of US 20
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.
Spur route; renumbered Iowa 173 when US 169 was created in Iowa Iowa 170: 1.68 [22] 2.70 Everly: US 18 near Everly 1930: 1974 Spur route, former portion of US 18; now County Road M27 Iowa 171: 1: 1.6 Wall Lake State Park (now Big Wall Lake Wildlife Area) US 75 in Onawa: 1930: 1935
From 1922 to 1978, it was also used on Iowa license plates [9] until it was replaced by the full county name. Finally, the number in the column headed "Map #" is used by the National Atlas of the United States, shown on the left; for purposes of the National Atlas, counties are numbered in geographical order beginning in the NW corner of the map.
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 ...
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 highway passes near or through the cities of Kellogg, Grinnell, Victor, Marengo, the Amana Colonies, and Tiffin before entering the Iowa City metropolitan area. Through Coralville and Iowa City, US 6 has no direct access to I-80, I-380, or US 218; other routes like Iowa Highway 1 (Iowa 1) and Iowa 965 provide direct access
Before it and the rest of the U.S. Numbered Highway System were designated on November 11, 1926, US 18 was known by two names in the state. It was first known as Primary Road No. 19, which was assigned to the route when the Iowa State Highway Commission published its first state highway map in 1919. [7]