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Some counties and the state could never come to an agreement, as was the case in Johnson County regarding Iowa Highway 979 (Iowa 979). The DOT wanted Johnson County to take over maintenance of the 6-mile-long (9.7 km) road and offered $160,000 to repair the road (equivalent to $400,000 in 2023 [4]), while the county wanted the state to take ...
Section from US 69 to Winnebago–Worth county line last shows on 1994 map, so was signed until 1994; now County Road 105 Iowa 106: 8.98: 14.45 Iowa 107 in Clear Lake: US 65 in Mason City: 1920: 1980 Now local roads and County Road B35 Iowa 107: 27.579: 44.384 Iowa 3 near Alexander: CR B35 near Clear Lake: 1920: 2011
I-35 / US 18 / Iowa 122 in Clear Lake: US 18 / US 65 in Mason City: 1998: current Serves the Mason City area US 18 Bus. 4.149: 6.677 US 18 / Iowa 76 near McGregor: US 18 / Iowa 76 in Marquette: 1989: current Serves McGregor and Marquette; former routing of US 18 US 20 Bus. — — US 77 / US 20 Bus. at South Sioux City, Neb.
Number Length (mi) [2] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed I-29: 151.941: 244.525 I-29 at Hamburg: I-29 at Sioux City: 1958: current
The western terminus for this first highway was Iowa 28, which later became U.S. Highway 151 near Marion, Iowa. The eastern terminus was at what today is known as U.S. Highway 30 near Mount Vernon, Iowa. The second Iowa 94 existed from 1966 until it was turned back on July 1, 2003. It was a renumbering of Iowa 74 because of I-74. The portions ...
In 1979, Iowa had the 9th largest public road system in the United States with over 113,000 miles (182,000 km) of roadways, 10,000 miles (16,000 km) of which were primary highways, comprising Interstate Highways, U.S. Highways, and state highways. State planners sought to offload nearly one-third of the primary system.
Iowa Highway 9 is the most northern of Iowa's east–west highways, traversing the entire northern tier of counties. It runs from the eastern terminus of South Dakota Highway 42 at the South Dakota border east of Sioux Falls, South Dakota near Benclare , to the Wisconsin border at Lansing where it continues as Wisconsin Highway 82 .
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.