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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).
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Iowa Highway 330 (Iowa 330) is a 47-mile-long (76 km) state highway that travels northeasterly from Altoona past Albion, to just north of Marshalltown in Marshall County. Originally the two-lane, unpaved road was numbered Iowa 88. It became part of Iowa 64 in the 1903s and it received its current route number in 1969. Iowa 330 is mostly a four ...
Former section of Iowa 188; became part of Iowa 188 again Iowa 122: 12.264: 19.737 I-35 / US 18 at Clear Lake: Mason City city limits 1999: current Iowa 123: 10.51: 16.91 I-35 in Des Moines: Iowa 90 in Des Moines 1924: 1959 Partially replaced by Iowa 60; rest now Fleur Drive Iowa 123: 0.45: 0.72 US 34 near Rome: Rome 1969
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That road, Iowa Avenue in Marshalltown, was designated as U.S. Route 30 Business, the first business route along US 30 in Iowa. The four-lane stretch southeast of Cedar Rapids was extended another five miles (8.0 km) to a point two miles (3.2 km) west of Mount Vernon, costing $5.6 million (equivalent to $10 million in 2023 dollars [ 18 ] ) to ...
Before it and the rest of the U.S. Numbered Highway System were designated on November 11, 1926, US 18 was known by two names in the state. It was first known as Primary Road No. 19, which was assigned to the route when the Iowa State Highway Commission published its first state highway map in 1919. [7]