Civil War, into Council Bluffs with I-480. US 6 crosses the Missouri River via the Grenville Dodge Memorial Bridge, named after the Union Army general during the U.S. However, between Adel and Waukee, the roadway is a four-lane divided highway that has a speed limit of 65 mph (105 km/h). While the route is away from I-80, US 6 is a two-lane highway with a rural speed limit of 55 miles per hour (90 km/h).

The route parallels I-80 for most of its length however, nearly one-third of the route overlaps the Interstate Highway.

US 6 is a cross-state route that connects Council Bluffs and Davenport by way of Des Moines and Iowa City. As a result, the least-traveled sections of the route were moved onto I-80 and control of the vacated sections of highway was given to local jurisdictions. As the Interstate Highway System expanded in the 1950–1970s, US 6's importance as a cross-state route was diminished by I-80. US 32 was renumbered in 1931 as US 6 was extended to the west coast. Numbered Highway System was created in 1926, the highway was designated U.S. Both were auto trails which connected Council Bluffs and Davenport. On the eastern side of Davenport, it joins I-74 and enters Bettendorf before leaving Iowa for Illinois.ĭating back to 1910, the route US 6 follows was originally the Great White Way and River-to-River Road. At Davenport, US 6 then follows I-280 and US 61 before entering the city. Near Wilton, the route heads north to I-80 where it again overlaps to Davenport. From Iowa City, the highway heads to the east-southeast through West Liberty and Atalissa. Through Coralville and Iowa City, US 6 has no direct access to I-80, I-380, or US 218 other routes like Iowa Highway 1 (Iowa 1) and Iowa 965 provide direct access. The highway passes near or through the cities of Kellogg, Grinnell, Victor, Marengo, the Amana Colonies, and Tiffin before entering the Iowa City metropolitan area. Through the Des Moines area, the highway runs about one mile (1.6 km) north or south of the I-35/I-80 corridor.Īt Altoona, the route again overlaps I-80 until Newton, where it splits away from I-80. Between De Soto and Adel, the highway overlaps US 169 before splitting off to the east toward Des Moines. North of Atlantic, the highway overlaps Interstate 80 (I-80) until De Soto. From there, it travels east through Oakland and Atlantic. The route begins at the Missouri River crossing at Council Bluffs. Like all state highways in Iowa, it is maintained by the Iowa Department of Transportation (Iowa DOT). The route is signed in places as the Grand Army of the Republic Highway. Highway 6 ( US 6) is an east–west United States Numbered Highway which runs 322 miles (518 km) across the U.S.

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