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Now local roads and County Road B35 Iowa 107: 27.579: 44.384 Iowa 3 near Alexander: CR B35 near Clear Lake: 1920: 2011 All but parts in Meservey and Thornton removed in 2003; now County Roads S25, B65 and S14 Iowa 108: 1.18: 1.90 Delta: Iowa 92 near Delta 1923: 1980 Spur route; now County Road V33 and Iowa 21 Iowa 109
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
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
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).
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 .
Dubuque was the largest city in Iowa to not have a high-speed connection to an Interstate Highway, even though it was the crossroads of four U.S. Highways: US 20, which was the only east–west U.S. Highway, and US 52, US 151, and US 61. From 1934 to 1967, there were five as US 67 ended in Dubuque as well.
The Iowa DOT and Iowa 511 can help you check road conditions and plan for save travel during snowstorms. Here's how to use the resources.
All three sections were originally kept as state highways, but, in 1991, when Iowa DOT first showed the new state highways' designations on the state highway map, the central section already had been turned over to Polk and Jasper counties. The western segment was numbered Iowa 925 and the eastern segment Iowa 927. [41]