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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).
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 ...
U.S. Highway 20 US 20 highlighted in red Route information Maintained by Iowa DOT Length 300.270 mi (483.238 km) Existed 1926–present Major junctions West end I-129 US 75 at South Sioux City, Neb. Major intersections I-29 in Sioux City US 75 at Sioux City US 71 near Early and Sac City US 169 near Fort Dodge I-35 near Williams US 65 near Iowa Falls I-380 / US 218 in Waterloo US 52 in Dubuque ...
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.
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
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.
I-29 / US 77 in Sioux City: Iowa 3 near Brunsville: 1957: 1968 Formerly Iowa 29; portion became Iowa 985 Iowa 7: 73.661: 118.546 Iowa 3 near Aurelia: US 169 at Fort Dodge: 1969: current Formerly Iowa 5 No. 8: 283: 455 No. 6 in Council Bluffs: Illinois state line at Burlington: 1920: 1926 Replaced by US 34 Iowa 8
Route description. U.S. Highway 34 extends across Iowa from west to east through the southern third of the state. It enters the state by crossing the Missouri River near Glenwood and exits over the Mississippi River on the Great River Bridge in Burlington. The majority of the highway follows a two-lane road over the southern Iowa drift plain.