US Bridges

I-280 over Dme RR

Good

Scott County, Iowa · 9.1 Mi. S of Jct. I-80 · Structure no. 000000000600700

Built
1971
54 years old
Condition
Good
inspected December 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
204 ft
3 main spans
Daily traffic
24,200
2022 count
Owner
State
State Highway Agency

About this bridge

I-280 over Dme RR is a prestressed concrete stringer/multi-beam or girder carrying I-280 over Dme RR in Scott County, Iowa. It was built in 1971, so it is 54 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 24,200 vehicles a day, roughly 31% of them trucks, projected to reach 24,200 by 2044. The structure is 204 ft (62.2 m) long and 84 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

CarriesI-280
CrossesDme RR
Location9.1 Mi. S of Jct. I-80
RouteInterstate 280
StateIowa
Coordinates41.48544, -90.64071
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating79.7 US tons
Inventory rating25.9 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length204 ft (62.2 m)
Longest span73 ft (22.3 m)
Deck width84 ft (25.7 m)
Roadway width81 ft (24.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24,200 (2022)
Projected traffic24,200 by 2044
Trucks31%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed8.7 mi (14 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-280 over Dme RR built?

It was built in 1971, making it 54 years old in 2025.

What condition is I-280 over Dme RR in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in December 2024.

How much traffic does I-280 over Dme RR carry?

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

How long is I-280 over Dme RR?

The structure is 204 ft (62.2 m) long with a longest span of 73 ft (22.3 m) and a deck 84 ft wide.

Who owns I-280 over Dme RR?

It is owned by the State Highway Agency.