US Bridges

EB I-80 over South Skunk River

Fair

Jasper County, Iowa · 2.5 Miles W of JCT Ia 117 · Structure no. 000000000030890

Built
1960
65 years old, rebuilt 1979
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
390 ft
3 main spans
Daily traffic
18,350
2023 count
Owner
State
State Highway Agency

About this bridge

EB I-80 over South Skunk River is a steel continuous stringer/multi-beam or girder carrying EB I-80 over South Skunk River in Jasper County, Iowa. It was built in 1960 and reconstructed in 1979, so it is 65 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 18,350 vehicles a day, roughly 31% of them trucks, projected to reach 18,350 by 2043. The structure is 390 ft (118.9 m) long and 42 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesEB I-80
CrossesSouth Skunk River
Location2.5 Miles W of JCT Ia 117
RouteInterstate 80
StateIowa
Coordinates41.68344, -93.29372
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68.8 US tons
Inventory rating41.3 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length390 ft (118.9 m)
Longest span150 ft (45.7 m)
Deck width42 ft (12.9 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,350 (2023)
Projected traffic18,350 by 2043
Trucks31%
Lanes on structure2
Traffic directionOne-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 EB I-80 over South Skunk River built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 1979.

What condition is EB I-80 over South Skunk 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 May 2023.

How much traffic does EB I-80 over South Skunk River carry?

About 18,350 vehicles per day (2023 count), of which roughly 31% are trucks.

How long is EB I-80 over South Skunk River?

The structure is 390 ft (118.9 m) long with a longest span of 150 ft (45.7 m) and a deck 42 ft wide.

Who owns EB I-80 over South Skunk River?

It is owned by the State Highway Agency.