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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 .
Interstate Highways of the Iowa Primary Highway System; Highway markers for I-80, I-380, and I-35 Bus. Loop ... I-29 / US 20 / US 75 at Sioux City
Section from Iowa 58 to US 20 was deleted in 1980; removed after US 20 freeway was constructed Iowa 57: 43.765: 70.433 US 65 near Iowa Falls: US 218 / Iowa 27 / Iowa 58 at Cedar Falls: 1986: current Formerly US 20 Iowa 58: 12.030: 19.360 US 63 at Hudson: US 218 / Iowa 27 / Iowa 57 at Cedar Falls: 1920: current Iowa 59: 197 [10] 317
From Moville through north of Early at the junction with U.S. Route 71 and Iowa Highway 471, US 20 was reconstructed from a rural two-lane highway to a four-lane road. This segment re-opened October 19, 2018 and made it so that US 20 is a continuous four-lane highway for its entire length in Iowa.
U.S. Highway 20 (US-20) is a part of the United States Numbered Highway System that runs for 3,365 miles (5,415 km) from Newport, Oregon, to Boston, Massachusetts.Within the state of Nebraska, it is a state highway that begins on the Wyoming–Nebraska state line west of Harrison near the Niobrara River and runs to the Nebraska–Iowa state line in South Sioux City.
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.
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. US 20 / US 75 at Sioux City: 1979: current Serves Sioux City area; former routing of US 20 US 20 Bus. — — US 20 west of Fort Dodge: US 20 east of Fort Dodge 1996: current
North of Council Bluffs, a 20-mile (32 km) section to Missouri Valley opened in November 1958. By December 1967, the two sections were connected, creating 100 miles (160 km) of continuous interstate highway. [2] Due to a shortage of male workers, at least 20 women were enlisted to help build this section of I-29.