Interstate 280 (Iowa–Illinois)

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Interstate 280

I-280 highlighted in red
Route information
Auxiliary route of I-80
Maintained by Iowa DOT and IDOT
Length26.98 mi[1] (43.42 km)
NHSEntire route
Major junctions
West end I-80 / US 6 / US 61 in Davenport, Iowa
Major intersections
East end I-74 / I-80 near Colona, Ill.
CountryUnited States
Highway system
US 275IA Iowa 281
I-270IL I-290

Interstate 280 (I-280) is an auxiliary Interstate Highway that makes up the western and southern portions of the beltway around the Quad Cities of Illinois and Iowa. The freeway starts at I-80 near Davenport, Iowa, and ends at I-80 near Colona, Illinois; its eastern part runs concurrent with I-74 to return to I-80. I-280 forms the southern part of a circle around the Quad Cities as well as forming part of a bypass (along with I-80) for US Route 61 (US 61) around Davenport. This road is 26.98 miles (43.42 km) long.[1]

Route description

I-280 begins at a directional T interchange with I-80 on the northwestern outskirts of Davenport. US 6 and US 61 join I-280 from opposite directions of I-80 at the interchange. It heads south along the western edge of Davenport. At the Kimberly Road exit, US 6 splits off to the east. It continues south for four miles (6.4 km), crossing Duck Creek, toward a diamond interchange with Scott County Road F65 (CR F65), which becomes Locust Street in Davenport.[2]

A bridge with a large arch crosses a river.
I-280 crosses the Mississippi River over the Baker Bridge.

Further south, I-280 passes the 620-acre (250 ha) West Lake Park.[3] South of West Lake Park, US 61 splits away from the Interstate on its way toward Muscatine. In the other direction, US 61 Business (US 61 Bus) heads toward the Davenport riverfront. South of US 61, I-280 curves to the southeast towards the Mississippi River. It drops into the river valley and meets Iowa Highway 22 (Iowa 22). It continues southeast and crosses the river via the Sergeant John F. Baker Jr. Bridge.[2]

Eastern terminus at the Big X interchange

In Illinois, I-280 runs for 17.6 miles (28.3 km).[1][4] It runs southeast from the Baker Bridge to Milan, where it parallels the Rock River. I-280 joins with I-74 at Quad Cities International Airport; this concurrency continues for 9.4 miles (15.1 km) before terminating at the I-74/I-80 interchange.

On the southeast corner of the Quad Cities (in Illinois), I-280 heading east ends and becomes I-80 while I-80 heads south from LeClaire, Rapids City, and Port Byron. I-80 heading south becomes I-74 which (after going through the center of the Quad Cities) hooks up with I-280. This exchange is called the Big X.


The original plan of I-280 matches the western half of the route today.

I-280 has been at the center of a few debates regarding its routing. In the early 1990s, the state of Illinois suggested, via American Association of State Highway and Transportation Officials (AASHTO) and Intermodal Surface Transportation Efficiency Act (ISTEA) hearings, swapping the I-80 and I-280 designations around the Quad Cities. The plan would have also changed I-74 to I-174. This was challenged by the state of Iowa, and the idea was dropped.

One of the reasons Illinois pursued the matter was due to the configuration of the eastern terminus of I-280; as a simple cloverleaf interchange, through I-80 traffic (along the north and east branches) was required to exit on both directions. Through I-74 traffic (along the west and south branches) is also required to exit on both directions. I-280 runs due west from the interchange.

Exit list


I-80 / US 6 west / US 61 north – Des Moines, Chicago
Western end of US 6 / US 61 overlap

US 6 east / CR F58 west (Kimberly Road) – Walcott
Eastern end of US 6 overlap
4.5257.2824 CR F65 (Locust Street, 160th Street) – St. Ambrose University

US 61 south / US 61 Bus. (West River Drive) – Muscatine
Eastern end of US 61 overlap
8.30413.3648 Iowa 22 / Great River Road (Rockingham Road) – Buffalo
Mississippi River9.58115.419Sergeant John F. Baker, Jr. Bridge
IllinoisRock IslandRock Island10.9817.6711 IL 92 / Great River Road – Andalusia, Rock IslandSigned as exits 11A (west) and 11B (east)
Airport Road to US 67 – Milan

I-74 west / US 6 to US 150 – Quad City Airport, Moline
Western end of I-74 overlap; signed as exits 18A (US 6 east) and 18B (I-74/US 6 west) eastbound; signed as exits 5A (I-74/US 6 west) and 5B (US 6 east) westbound

I-74 east / IL 110 (CKC) west – Peoria

I-80 / IL 110 (CKC) east to I-88 – Des Moines, Chicago
Big X; eastern end of I-74 overlap
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


  1. ^ a b c "Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System Of Interstate and Defense Highways". FHWA Route Log and Finder List. Federal Highway Administration. December 31, 2021. Retrieved July 4, 2022.
  2. ^ a b c Iowa Department of Transportation (2011). State of Iowa Transportation Map (PDF) (Map). Ames: Iowa Department of Transportation. Quad Cities inset. Retrieved July 25, 2011.
  3. ^ Scott County Conservation. "West Lake Park". Retrieved July 28, 2011.
  4. ^ a b Illinois Technology Transfer Center (2006). "T2 GIS Data". Retrieved November 8, 2007.
  5. ^ 2009 Volume of Traffic on the Primary Road System of Iowa (PDF) (Report). Iowa Department of Transportation. January 1, 2009. Retrieved March 22, 2010.