I-280 over Mississippi River & Road

Fair

Scott County, Iowa · In Rock Island · Structure no. 000000000600690

Built: 1970; 55 years old
Condition: Fair; inspected August 2024
Type: Arch - Thru; Steel
Length: 4,193 ft; 1 main span
Daily traffic: 24,200; 2022 count
Owner: State; State Highway Agency

About this bridge

I-280 over Mississippi River & Road is a steel arch - thru carrying I-280 over Mississippi River & Road in Scott County, Iowa. It was built in 1970, so it is 55 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 24,200 vehicles a day, roughly 31% of them trucks, projected to reach 24,200 by 2044. The structure is 4,193 ft (1,278 m) long and 85 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesI-280

CrossesMississippi River & Road

LocationIn Rock Island

RouteInterstate 280

CountyScott County

StateIowa

Coordinates41.48311, -90.63764

Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

Component	Rating	Meaning
Deck	6 Satisfactory	Structural elements show some minor deterioration.
Superstructure	5 Fair	All primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure	5 Fair	All primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection	8 Very Good	No problems noted.

Last inspectionAugust 2024

Inspection intervalevery 24 months

Operating statusOpen, no restriction

ScourFoundations stable; scour within limits of footing or piles

Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is

Deck geometry9: Superior to present desirable criteria

Waterway adequacy8: Equal to present desirable criteria

Approach roadway alignment8: Equal to present desirable criteria

Operating rating63.6 US tons

Inventory rating38.3 US tons

Structure

Structure typeArch - Thru

MaterialSteel

DeckConcrete, cast-in-place

Main spans1 (+27 approach)

Design loadHS 20 + Mod

Structure length4,193 ft (1,278 m)

Longest span570 ft (173.7 m)

Deck width85 ft (25.9 m)

Roadway width82 ft (25 m)

Vertical clearance over deck19 ft (5.7 m)

Traffic and service

Average daily traffic24,200 (2022)

Projected traffic24,200 by 2044

Trucks31%

Lanes on structure4

Traffic directionTwo-way traffic

CarriesHighway

CrossesHighway and waterway

Detour if closed3.7 mi (6 km)

TollOn a free road

National Highway SystemYes

Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency

Maintained byState Highway Agency

Historic statusNot eligible for the National Register of Historic Places

Work proposedNone recorded

Estimated improvement cost—

NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was I-280 over Mississippi River & Road built?

It was built in 1970, making it 55 years old in 2025.

What condition is I-280 over Mississippi River & Road in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in August 2024.

How much traffic does I-280 over Mississippi River & Road carry?

About 24,200 vehicles per day (2022 count), of which roughly 31% are trucks.

How long is I-280 over Mississippi River & Road?

The structure is 4,193 ft (1,278 m) long with a longest span of 570 ft (173.7 m) and a deck 85 ft wide.

Who owns I-280 over Mississippi River & Road?

It is owned by the State Highway Agency.