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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).
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
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. Once the U.S. Highway System was established, the automobile association-sponsored roads gradually disappeared. A map of Iowa's U.S. Highways as laid out in 1926
U.S. Route 20 in Iowa. 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.
U.S. Highway 30 ( US 30) is a major east–west U.S. Highway which spans 330 miles (530 km) across the state of Iowa. It is the longest primary highway in the state and is maintained by the Iowa Department of Transportation (Iowa DOT). The route in Iowa begins at the Missouri River crossing at Blair, Nebraska, and ends at the Mississippi River ...
Iowa Highway 1 ( Iowa 1) is a state highway in the U.S. state of Iowa that extends from Keosauqua to Anamosa. It travels nearly 120 miles (190 km), mainly through rich farmland and small communities. Iowa 1 provides an important link to Iowa City and the University of Iowa as it passes through campus.
Secondary. Scenic. ← Iowa 28. → US 30. In the US state of Iowa, Interstate 29 ( I-29) is a north–south Interstate Highway which closely parallels the Missouri River. I-29 enters Iowa from Missouri near Hamburg and heads to the north-northwest through the Omaha–Council Bluffs and the Sioux City areas.
01958-09-21. 1958. current. Primary Interstates. I-29 as viewed from the Sergeant Floyd Monument. I-35 approaching exit 182. The Interstate 74 Bridge carrying I-74 across the Mississippi River. I-80 in western Iowa near Walnut. Traffic congestion on I‑35 / I‑80 during the Iowa flood of 2008.