US Bridges

I-80 over Middle River

Fair

Adair County, Iowa · 3.3 Mi. E of SR N-54 · Structure no. 000000000013140

Built
1958
67 years old
Condition
Fair
inspected October 2023
Type
Culvert
Concrete Continuous
Length
51 ft
3 main spans
Daily traffic
24,800
2022 count
Owner
State
State Highway Agency

About this bridge

I-80 over Middle River is a concrete continuous culvert carrying I-80 over Middle River in Adair County, Iowa. It was built in 1958, so it is 67 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 24,800 vehicles a day, roughly 39% of them trucks, projected to reach 24,800 by 2042. The structure is 51 ft (15.5 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesI-80
CrossesMiddle River
Location3.3 Mi. E of SR N-54
RouteInterstate 80
CountyAdair County
StateIowa
Coordinates41.49623, -94.58164
Functional classRural 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.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.6 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20
Structure length51 ft (15.5 m)
Longest span18 ft (5.5 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24,800 (2022)
Projected traffic24,800 by 2042
Trucks39%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was I-80 over Middle River built?

It was built in 1958, making it 67 years old in 2025.

What condition is I-80 over Middle River 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 October 2023.

How much traffic does I-80 over Middle River carry?

About 24,800 vehicles per day (2022 count), of which roughly 39% are trucks.

How long is I-80 over Middle River?

The structure is 51 ft (15.5 m) long with a longest span of 18 ft (5.5 m).

Who owns I-80 over Middle River?

It is owned by the State Highway Agency.