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Park access road Iowa 274: 1.99 [12] 3.20 Ambrose A. Call State Park: US 169 near Algona: 1934: 1986 Park access road; formerly Iowa 163 Iowa 276: 4.711: 7.582 Spirit Lake city limits: Minnesota state line 1934: 2003 Park access road Iowa 277: 6.24: 10.04 Numa: Iowa 5 near Centerville: 1935: 1980 Spur route
City US 6: 10.2 [3] 16.4 US 6 in Des Moines: US 6 / US 65 in Des Moines 1934: 1968 Former routing of US 6 US 18 Bus. 10.752: 17.304 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
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.
Number Length (mi) [2] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes I-80N: 17.102: 27.523 I-29 at Loveland: I-80 near Neola: 1966
Near the Boyer River, Iowa 39 intersects the two highways. Just beyond the city limits of Denison, Iowa 141 splits off to the west as US 59 remains on a northwestern vector. [2] [3] South of Schleswig, the highway straightens out to the north and stays in that direction until it reaches Iowa 175 east of Ida Grove.
U.S. Highway 20 (US 20) in Iowa is a major east–west artery which runs across the state, separating the northern third of Iowa from the southern two-thirds. It enters Iowa from Nebraska, concurrent with Interstate 129 (I-129) and US 75, crossing the Missouri River at Sioux City.
The bill gave Iowa's 99 counties the responsibility for maintaining the roads, which had previously fallen upon road associations that sponsored their respective highways. [13] The new primary roads were assigned route numbers, a trend in other Midwestern states .
In southern Iowa, the last section, from Iowa 2 near Decatur City to the state line, was completed on December 2, 1970. In northern Iowa, the section from Iowa 9 near Hanlontown to the state line opened on December 12, 1972. The last section of I-35 to open, from US 20 to Mason City, opened on November 14, 1975. [2]