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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.
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
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. U.S. Highway 63 ( US 63) is a United States Highway that runs through the eastern third of Iowa. It begins at the Missouri state line southwest of Bloomfield and travels north through Ottumwa, Oskaloosa, Tama, Waterloo, and New Hampton. It ends at the Minnesota state line at Chester. Between Ottumwa and Oskaloosa, the highway ...
Scenic. ← Iowa 86. → Iowa 93. Iowa Highway 92 ( Iowa 92) is a state highway that runs from east to west across the state of Iowa. Iowa 92 is 279 miles (449 km) long and is part of a continuous 886-mile (1,426 km) four-state "Highway 92" which begins in Torrington, Wyoming, goes through Nebraska and Iowa and ends in La Moille, Illinois. It ...
The United States Numbered Highway System (often called U.S. Routes or U.S. Highways) is an integrated network of roads and highways numbered within a nationwide grid in the contiguous United States. As the designation and numbering of these highways were coordinated among the states, they are sometimes called Federal Highways, but the roadways ...
List of Interstate Highways. There are 70 primary Interstate Highways in the Interstate Highway System, a network of freeways in the United States. These primary highways are assigned one- or two-digit route numbers, whereas their associated auxiliary Interstate Highways receive three-digit route numbers. Typically, odd-numbered Interstates run ...