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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
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 ...
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
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.
U.S. Highway 18 (US 18) is the northernmost east–west United States Numbered Highway in the state of Iowa. As with all state highways in Iowa, it is maintained by the Iowa Department of Transportation (Iowa DOT). It enters the state by crossing the Big Sioux River between Inwood and Canton, South Dakota.
In Iowa, though, there were two sections in 1988 which were particularly troublesome for travelers. The I-680 interchange near Neola was closed, so I-680-bound traffic was forced to travel through Neola on Iowa 191 to reach that highway. Another bottleneck occurred near Williamsburg, where it was a two-lane road for six miles (9.7 km).
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 ...