Misplaced Pages

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
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

Number	Length (mi)	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

Number	Length (mi)	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

Number	Length (mi)	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. ^ "Road Network (Portal)" (ESRI shapefile). Ames: Iowa Department of Transportation. April 9, 2021. Retrieved April 19, 2021.

External links

• The Iowa Highways Page by Jason Hancock
• Interstate Guide

• Lists of roads in Iowa
• Interstate Highways in Iowa