List of Interstate Highways in Iowa

"Iowa Interstate" redirects here. For the railroad, see Iowa Interstate Railroad.

Interstate Highways of the Iowa Primary Highway System
Highway markers for I-80, I-380, and I-35 Bus. Loop
Interstate Highways in Iowa highlighted in red
System information
FormedAugust 14, 1957[1]
Highway names
InterstatesInterstate X (I-X)
Business Loops:Interstate X Business (I-X Bus.)
System links

Interstate Highways in Iowa form a network of freeways that cross the U.S. state of Iowa as part of the Interstate Highway System.

Primary Interstates

Number Length (mi)[2] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed
I-29 151.941 244.525 I-29 at Hamburg I-29 at Sioux City 01958-10-011958 current
I-35 218.532 351.693 I-35 near Lamoni I-35 near Albert Lea, Minn. 01958-09-211958 current
I-74 5.399 8.689 I-80 at Davenport I-74 / US 6 at Bettendorf 01968-08-301968 current
I-80 306.392 493.090 I-80 at Council Bluffs I-80 at LeClaire 01958-09-211958 current

Auxiliary Interstates

Number Length (mi)[2] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
I-80N 17.102 27.523 I-29 at Loveland I-80 near Neola 01966-01-011966 01973-01-011973 Replaced by I-680; now I-880
I-129 0.286 0.460 I-129 / US 20 / US 75 at Sioux City I-29 / US 20 / US 75 at Sioux City 01976-11-221976 current
I-235 14.585 23.472 I-35 / I-80 at West Des Moines I-35 / I-80 at Des Moines 01961-12-141961 current
I-280 9.862 15.871 I-80 / US 6 at Davenport I-280 at Rock Island, Ill. 01973-10-251973 current
I-380 72.969 117.432 I-80 / U.S. Route 218 / Iowa 27 near Coralville US 218 at Waterloo 01973-09-191973 current
I-480 0.877 1.411 I-480 / US 6 at Council Bluffs I-29 / US 6 at Council Bluffs 01966-09-211966 current
I-680 3.353 5.396 I-680 at Omaha, Neb. I-29 near Crescent 01966-12-131966 current
I-880 17.102 27.523 I-29 at Loveland I-80 near Neola 02019-10-052019 current Replaced a portion of I-680
  •       Former

Business routes

Number Length (mi)[2] Length (km) Southern or western terminus Northern or eastern terminus Cities Formed Removed
I-35 Business Loop 6.927 11.148 I-35 / US 30 in Ames I-35 in Ames Ames 01995-10-271995 current
I-35 Business Loop 2.979 4.794 I-35 / US 18 in Clear Lake I-35 / US 18 / Iowa 122 in Clear Lake Clear Lake 01999-04-171999 current

References

  1. ^ Official Route Numbering for the National System of Interstate and Defense Highways (Map). American Association of State Highway Officials. August 14, 1957.
  2. ^ a b c "Road Network (Portal)" (ESRI shapefile). Ames: Iowa Department of Transportation. April 9, 2021. Retrieved April 19, 2021.
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