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
Formed| August 14, 1957[1]
Highway names
Interstates| Interstate X (I-X)
Business Loops:| Interstate X Business (I-X Bus.)
System links

* Iowa Primary Highway System

* Interstate
* US
* State
* Secondary
* Scenic

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

[edit]

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

* 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

[edit]

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

* 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

[edit]

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

[edit]

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.

## External links

[edit]

Wikimedia Commons has media related to Interstate Highways in Iowa.

KML file (edit • help)

Template:Attached KML/List of Interstate Highways in Iowa

KML is from Wikidata

* The Iowa Highways Page by Jason Hancock
* Interstate Guide