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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. Currently, the longest primary highway is U.S. Highway 30 at 332 miles (534 km). The shortest highway is Interstate 129 at 0.27 miles (430 m).
U.S. Highway 30 ( US 30) is a major east–west U.S. Highway which spans 330 miles (530 km) across the state of Iowa. It is the longest primary highway in the state and is maintained by the Iowa Department of Transportation (Iowa DOT). The route in Iowa begins at the Missouri River crossing at Blair, Nebraska, and ends at the Mississippi River ...
Once the U.S. Highway System was established, the automobile association-sponsored roads gradually disappeared. A map of Iowa's U.S. Highways as laid out in 1926. The new US 63 entered Iowa near Bloomfield and traveled north through Ottumwa to Oskaloosa. There it turned to the northwest to go through Pella, Monroe, and Prairie City.
01958-09-21. 1958. current. Primary Interstates. I-29 as viewed from the Sergeant Floyd Monument. I-35 approaching exit 182. The Interstate 74 Bridge carrying I-74 across the Mississippi River. I-80 in western Iowa near Walnut. Traffic congestion on I‑35 / I‑80 during the Iowa flood of 2008.
Secondary. Scenic. ← Iowa 28. → US 30. In the US state of Iowa, Interstate 29 ( I-29) is a north–south Interstate Highway which closely parallels the Missouri River. I-29 enters Iowa from Missouri near Hamburg and heads to the north-northwest through the Omaha–Council Bluffs and the Sioux City areas.
U.S. Highway 20 US 20 highlighted in red Route information Maintained by Iowa DOT Length 300.270 mi (483.238 km) Existed 1926–present Major junctions West end I-129 US 75 at South Sioux City, Neb. Major intersections I-29 in Sioux City US 75 at Sioux City US 71 near Early and Sac City US 169 near Fort Dodge I-35 near Williams US 65 near Iowa Falls I-380 / US 218 in Waterloo US 52 in Dubuque ...
Interstate 35(I-35) is a north–south Interstate Highwayin 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. It enters the state near Lamonifrom Missouriand continues north through the ...
U.S. Highway 61 US 61 highlighted in red Route information Maintained by Iowa DOT Length 192.663 mi (310.061 km) Existed July 1, 1926 (1926-07-01) –present Major junctions South end US 61 / US 136 south of Keokuk Major intersections US 218 at Keokuk US 34 at Burlington I-80 at Davenport US 30 at DeWitt US 151 south of Dubuque US 20 at Dubuque North end US 61 / US 151 at Dubuque Location ...