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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
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).
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
US 61 / Iowa 64 in western Maquoketa 1998: current Serves Maquoketa; unsigned US 63 Bus. 6.426: 10.342 US 34 / US 63 in southeastern Ottumwa: US 34 / Iowa 149 / Iowa 163 north of Ottumwa 2007: current Serves Ottumwa; former routing of US 63 US 63 Bus. — — US 18 / US 63 south of New Hampton: US 63 north of New Hampton 2002
As the main purpose of these routes is to serve a certain downtown or urban area, business Interstates are typically routed along surface roads rather than limited-access freeway segments. This allows the business route to directly connect to and navigate a local street network, providing more accessible connections to the central business ...
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.
The two routes, now on a four-lane, controlled-access highway, follow a path which passes to the south of Mason City. They meet US 65 and US 18 Bus. at exit 186. [5] US 18/US 218/Iowa 27 pass a wind farm near Charles City. At the Floyd county line, US 18 and Iowa 27 become a limited-access road and angle slightly to the northeast, passing Rudd.