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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
Number Length (mi) [2] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes I-80N: 17.102: 27.523 I-29 at Loveland: I-80 near Neola: 1966
U.S. Highway 63 was designated along Primary Roads No. 13, 24, and 2, which was the Daniel Boone Trail from Missouri to Des Moines. [6] 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
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 US 20 Bus. — — US 20 west of Fort Dodge: US 20 east of Fort Dodge 1996
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).
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]
Iowa 12 north (Riverside Boulevard) / Loess Hills National Scenic Byway – Akron: Northern end of Iowa 12 overlap; IowaDOT signs this as southern end of Iowa 12: Big Sioux River: 151.826: 244.340: Iowa–South Dakota state line: I-29 north – Sioux Falls: Continuation into South Dakota: 1.000 mi = 1.609 km; 1.000 km = 0.621 mi
US 30 enters Logan and intersects the eastern end of Iowa Highway 127 (Iowa 127). The highway runs parallel to the Boyer River as well as the Overland Route in a general northeast direction from Logan. [3] Four miles (6.4 km) east of Logan is the western end of Iowa 44, which extends 105 miles (169 km) east to Des Moines. [6]