List of Interstate Highways in Iowa

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Highway markers for I-29, I-680, and I-35 Bus. Loop
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 state.


Primary Interstates

Number Length (mi) Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
I-29 151.826 244.340 I-29 at Hamburg I-29 at Sioux City 01958-10-011958 current All of I-29 is part of the Lewis & Clark Trail; completed in 1972[2]
I-35 218.432 351.532 I-35 near Lamoni I-35 near Albert Lea, Minn. 01958-09-211958 current
I-74 5.386 8.668 I-80 at Davenport I-74 / US 6 at Bettendorf 01968-08-301968 current
I-80 306.268 492.891 I-80 at Council Bluffs I-80 at LeClaire 01958-09-211958 current I-80 is the longest Interstate Highway in Iowa; completed in 1972

Auxiliary Interstates

Number Length (mi) Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
I-80N 16.565 26.659 I-29 at Loveland I-80 near Neola 01966-01-011966 01973-01-011973 Now the eastern end of I-680, I-80N was a spur from Loveland to Neola
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 13.816 22.235 I-35 / I-80 at West Des Moines I-35 / I-80 at Des Moines 01961-12-141961 current
I-280 9.581 15.419 I-80 / US 6 at Davenport I-280 at Rock Island, Ill. 01973-10-251973 current
I-380 73.080 117.611 I-80 / US 218 / Iowa 27 near Coralville US 218 at Waterloo 01973-09-191973 current
I-480 0.721 1.160 I-480 / US 6 at Council Bluffs I-29 / US 6 at Council Bluffs 01966-09-211966 current
I-680 29.391 47.300 I-680 at Omaha, Nebr. I-80 near Neola 01966-12-131966 current
  •       Former

Business routes

Number Length (mi) Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
I-35 Business Loop — — I-35 / US 30 in Ames I-35 in Ames — — Serves Ames
I-35 Business Loop — — I-35 / US 18 in Clear Lake I-35 / US 18 / Iowa 122 in Clear Lake — — Serves Clear Lake

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. ^ Completion Map of Interstate System (PDF) (Map). Iowa Department of Transportation. January 1, 1982. Retrieved September 8, 2010.

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