List of Interstate Highways in Iowa
From Wikipedia, the free encyclopedia
Interstate Highways in Iowa form a network of freeways that cross the U.S. state of Iowa as part of the Interstate Highway System.
FormedAugust 14, 1957[1]
InterstatesInterstate X (I-X)
Business Loops:Interstate X Business (I-X Bus.)
| Interstate Highways of the Iowa Primary Highway System | |
|---|---|
.svg) .svg)  Highway markers for I-80, I-380, and I-35 Bus. Loop | |
 Interstate Highways in Iowa highlighted in red | |
| System information | |
| Formed | August 14, 1957[1] |
| Highway names | |
| Interstates | Interstate X (I-X) |
| Business Loops: | Interstate X Business (I-X Bus.) |
| System links | |
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 | 1958 | current | ||
 I-35 |
218.532 | 351.693 | I-35 near Lamoni | I-35 near Albert Lea, Minn. | 1958 | current | ||
 I-74 |
5.399 | 8.689 | I-80 at Davenport | I-74 / US 6 at Bettendorf | 1968 | current | ||
 I-80 |
306.392 | 493.090 | I-80 at Council Bluffs | I-80 at LeClaire | 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
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 | 1966 | 1973 | 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 | 1976 | current | ||
 I-235 |
14.585 | 23.472 | I-35 / I-80 at West Des Moines | I-35 / I-80 at Des Moines | 1961 | current | ||
 I-280 |
9.862 | 15.871 | I-80 / US 6 at Davenport | I-280 at Rock Island, Ill. | 1973 | current | ||
 I-380 |
72.969 | 117.432 | I-80 / U.S. Route 218 / Iowa 27 near Coralville | US 218 at Waterloo | 1973 | current | ||
 I-480 |
0.877 | 1.411 | I-480 / US 6 at Council Bluffs | I-29 / US 6 at Council Bluffs | 1966 | current | ||
 I-680 |
3.353 | 5.396 | I-680 at Omaha, Neb. | I-29 near Crescent | 1966 | current | ||
 I-880 |
17.102 | 27.523 | I-29 at Loveland | I-80 near Neola | 2019 | current | Replaced a portion of I-680 | |
| ||||||||
- Auxiliary Interstates
I‑235 crossing the Des Moines River in Des Moines, Iowa
The Edna M. Griffin Memorial Bridge carrying I‑235 across the Des Moines River
I‑280 crosses the Mississippi River over the Baker Bridge.
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 | 1995 | 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 | 1999 | current | |
