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Route map Interstate Highways of the Iowa Primary Highway System ... Interstate Highways of the Iowa Primary Highway System; Highway markers for I-80, I-380, and I-35 ...
US 34 / US 218 / Iowa 27 / Iowa 163 at Mount Pleasant: 2005: current Serves Mount Pleasant area; former routing of US 34 US 52 Alt. — — US 52 / US 61 / US 151 in Dubuque: US 52 / Iowa 3 in Luxemburg: 1964: 1967 Original routing of US 52; mainline US 52 traffic diverted to allow for repairs on the alternate route US 61 Bus.
Since before the Iowa Primary Highway System was created in 1920, the Council Bluffs-to-Davenport, by way of Des Moines, corridor has always been important. Two roughly parallel auto trails, the Great White Way and the River-to-River Road, served cross-state traffic. The two routes were merged into one route, the Whiteway Highway, in 1922. [44]
Spur route; replaced by an extended Iowa 16, and Iowa 98 was reassigned to the old route of Iowa 16 Iowa 98: 1.814: 2.919 Leando: Iowa 16 near Douds: 1920: 2017 Spur route; originally began at Iowa 8 (later US 34) east of Agency, but was shortened to Iowa 16 near Douds in 1942 (this section became Iowa 16); now County Road V64 Iowa 99
Interstate 35 (I-35) is a north–south Interstate Highway in the United States that runs from Laredo, Texas, to Duluth, Minnesota. In Iowa , the highway runs from south to north through the center of the state, roughly parallel to U.S. Highway 69 (US 69) and US 65 .
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]
U.S. Highway 20 (US 20) in Iowa is a major east–west artery which runs across the state, separating the northern third of Iowa from the southern two-thirds. It enters Iowa from Nebraska, concurrent with Interstate 129 (I-129) and US 75, crossing the Missouri River at Sioux City. US 20 runs in a more-or-less straight line across Iowa ...
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.
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