List of Interstate Highways in Iowa

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70px I-680 (IA).svg Business Loop 35.svg
Highway markers for I-29, I-680, and I-35 Bus. Loop
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) 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 1958 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. 1958 current
I‑74 5.386 8.668 I-80 at Davenport I-74 / US 6 at Bettendorf 1968 current
I‑80 306.268 492.891 I-80 at Council Bluffs I-80 at LeClaire 1958 current I-80 is the longest Interstate Highway in Iowa; completed in 1972
  • Primary Interstates

  • I-29 crossing over the mouth of the Floyd River

  • Photograph

    I-35 approaching exit 182

  • IA 5 interchange from I-35.JPG

    Exit 68 to Iowa Highway 5 on I-35 south of West Des Moines

  • I-74 bridge toward Bettendorf.JPG

    The Interstate 74 Bridge carrying I-74 across the Mississippi River

  • Photograph

    I-80 in western Iowa near Walnut

  • Iowa Flood I-80 DSM 20080613.jpg

    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
x25px I‑80N 16.565 26.659 I-29 at Loveland I-80 near Neola 1966 1973 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 1976 current
I‑235 13.816 22.235 I-35 / I-80 at West Des Moines I-35 / I-80 at Des Moines 1961 current
I‑280 9.581 15.419 I-80 / US 6 at Davenport I-280 at Rock Island, Ill. 1973 current
I‑380 73.080 117.611 I-80 / US 218 / Iowa 27 near Coralville US 218 at Waterloo 1973 current
I‑480 0.721 1.160 I-480 / US 6 at Council Bluffs I-29 / US 6 at Council Bluffs 1966 current
I‑680 29.391 47.300 I-680 at Omaha, Nebr. I-80 near Neola 1966 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

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External links

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