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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.
The Federal Aid Highway Act of 1956 brought the Interstate Highway System to the United States and 700 miles (1,100 km) of new highways to Iowa, which included a highway along the eastern bank of the Missouri River. Construction began, in segments, on what would become I-29 in the late 1950s near Sioux City and Council Bluffs. When the 20-mile ...
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. The new US 63 entered Iowa near Bloomfield and traveled north through Ottumwa to Oskaloosa. There it turned to the northwest to go through Pella, Monroe, and Prairie City.
Dating back to 1910, the route US 6 follows was originally the Great White Way and River-to-River Road. Both were auto trails which connected Council Bluffs and Davenport. When the U.S. Numbered Highway System was created in 1926, the highway was designated U.S. Highway 32 (US 32). US 32 was renumbered in 1931 as US 6 was extended to the west ...
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 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. It travels about 312 miles (502 km ...
Scenic. ← US 65. → US 69. U.S. Highway 67 ( US 67) is a U.S. Highway in extreme eastern Iowa. The route begins in Davenport at the Rock Island Centennial Bridge where it crosses the Mississippi River and ends at an intersection with US 52 and Iowa Highway 64 (Iowa 64) west of Sabula. It passes through Bettendorf, Le Claire, and Clinton.
Iowa Highway 64 ( Iowa 64) is a 64-mile-long (103 km) state highway that runs through two counties in east central Iowa. It begins at an interchange with U.S. Route 151 (US 151) in Anamosa and ends at the Dale Gardner Veterans Memorial Bridge over the Mississippi River near Sabula. It continues through Illinois as Illinois Route 64.