List of Interstate Highways in Iowa
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| 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 | |
Interstate Highways in Iowa form a network of freeways that cross the state.
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
Traffic congestion on I‑35 / I‑80 during the Iowa flood of 2008
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
The I‑480 bridge over the Missouri River between Council Bluffs, Iowa and Downtown Omaha, Nebraska
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 | |
References
- ^ Official Route Numbering for the National System of Interstate and Defense Highways (Map). American Association of State Highway Officials. August 14, 1957.
- ^ a b c "Road Network (Portal)" (ESRI shapefile). Ames: Iowa Department of Transportation. April 9, 2021. Retrieved April 19, 2021.
External links
Wikimedia Commons has media related to Interstate Highways in Iowa.
- The Iowa Highways Page by Jason Hancock
- Interstate Guide