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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. US 20 / US 75 at Sioux City: 1979: current Serves Sioux City area; former routing of US 20
Section from US 20 to Holstein replaced by realigned US 59; rest given to county because US 59 was realigned Iowa 131: 4.520: 7.274 Iowa 21 in Belle Plaine: US 30 near Belle Plaine 1937: 2003 Part of the Lincoln Highway; now County Road V40 Iowa 132: 5.74 [19] 9.24 I-35 / I-80 in Des Moines: Iowa 90 (now US 6) in Des Moines
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.
I-129 / US 20 / US 75 at Sioux City: I-29 / US 20 / US 75 at Sioux City 1976: current I-235: 14.585: 23.472 I-35 / I-80 at West Des Moines: I-35 / I-80 at Des Moines: 1961: current I-280: 9.862: 15.871 I-80 / US 6 at Davenport: I-280 at Rock Island, Ill. 1973: current I-380: 72.969: 117.432 I-80 / U.S. Route 218 / Iowa 27 near Coralville
As I-80 enters the Iowa City area, the speed limit drops to 65 mph (105 km/h). [27] On the edge of Coralville is an interchange with US 218 and Iowa 27. This interchange is also the beginning of I-380, which heads north along US 218 and Iowa 27 toward Cedar Rapids and Waterloo. [28]
From 1922 to 1978, it was also used on Iowa license plates [9] until it was replaced by the full county name. Finally, the number in the column headed "Map #" is used by the National Atlas of the United States, shown on the left; for purposes of the National Atlas, counties are numbered in geographical order beginning in the NW corner of the map.
The Pershing Map FDR's hand-drawn map from 1938. The United States government's efforts to construct a national network of highways began on an ad hoc basis with the passage of the Federal Aid Road Act of 1916, which provided $75 million over a five-year period for matching funds to the states for the construction and improvement of highways. [8]
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.