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Route map Interstate Highways of the Iowa Primary Highway System ... Highway markers for I-80, I-380, and I-35 Bus. Loop ... I-80 / U.S. Route 218 / Iowa 27 near ...
Near the Mississippi River, the Interstate takes a sharp curve to the southeast to line up perpendicularly to the river. Just before the base of the bridge is an interchange with US 67, the last exit in Iowa. I-80 ends its 306-mile-long (492 km) journey through Iowa over the Mississippi River on the Fred Schwengel Memorial Bridge.
Interstate 35 (I-35) is a north–south Interstate Highway in the United States that runs from Laredo, Texas, to Duluth, Minnesota.In Iowa, the highway runs from south to north through the center of the state, roughly parallel to U.S. Highway 69 (US 69) and US 65.
Between August 1918 and June 1919, Iowa's first seedling mile was built in Linn County, west of Mount Vernon. The ribbon of concrete, which was 16 feet (4.9 m) wide, 7 + 1 ⁄ 2 inches (19 cm) thick, and crowned for drainage 1 + 1 ⁄ 2 inches (3.8 cm), cost nearly $35,000 (equivalent to $460,000 in 2023 dollars [ 18 ] ) to build.
I-29 was built in sections over a period of 15 years. When there was a shortage of male workers, female workers stepped in to build a 20-mile (32 km) section near Missouri Valley. Between Council Bluffs and Sioux City, I-29 replaced U.S. Highway 75 (US 75) as the major route in western Iowa.
It enters Iowa from Nebraska, concurrent with Interstate 129 (I-129) and US 75, crossing the Missouri River at Sioux City. US 20 runs in a more-or-less straight line across Iowa, paralleling 42° 27' N. It leaves Iowa in Dubuque by crossing the Mississippi River into Illinois. Since October 2018, US 20 is a four-lane divided highway for its ...
Interstate 380 (I-380) is a 73-mile (117 km) auxiliary Interstate Highway in eastern Iowa. The route extends from I-80 near Coralville to Waterloo . I-380 connects the cities of Cedar Rapids and Waterloo, the state's second- and sixth-largest cities, respectively, to the Interstate Highway System .
Renumbered Iowa 389 so Iowa 160 could be reused as a spur of Iowa 60 (this section now Iowa 415) Iowa 160: 2.446: 3.936 Iowa 415 at Ankeny: I-35 at Ankeny 1947: current extended east from US 69 to I-35 in 1980 Iowa 161: 1.15 [8] 1.85 Iowa 25 in Guthrie County: Springbrook State Park: 1938: 1944