US Bridges

I-80 over Drainage Ditch

Fair

Adair County, Iowa · 1.7 Mi. E of Jct. SR P-28 · Structure no. 000000000013280

Built
1959
66 years old, rebuilt 2005
Condition
Fair
inspected December 2022
Type
Culvert
Concrete Continuous
Length
26 ft
2 main spans
Daily traffic
27,600
2022 count
Owner
State
State Highway Agency

About this bridge

I-80 over Drainage Ditch is a concrete continuous culvert carrying I-80 over Drainage Ditch in Adair County, Iowa. It was built in 1959 and reconstructed in 2005, so it is 66 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 6 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 27,600 vehicles a day, roughly 34% of them trucks, projected to reach 27,600 by 2042. The structure is 26 ft (7.9 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-80
CrossesDrainage Ditch
Location1.7 Mi. E of Jct. SR P-28
RouteInterstate 80
CountyAdair County
StateIowa
Coordinates41.49293, -94.28453
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 protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2022
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating31.7 US tons
Inventory rating19.3 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length26 ft (7.9 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic27,600 (2022)
Projected traffic27,600 by 2042
Trucks34%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 Drainage Ditch built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 2005.

What condition is I-80 over Drainage Ditch 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 December 2022.

How much traffic does I-80 over Drainage Ditch carry?

About 27,600 vehicles per day (2022 count), of which roughly 34% are trucks.

How long is I-80 over Drainage Ditch?

The structure is 26 ft (7.9 m) long with a longest span of 12 ft (3.7 m).

Who owns I-80 over Drainage Ditch?

It is owned by the State Highway Agency.