US Bridges

EB I-80 over SR N-28

Fair

Cass County, Iowa · At Jct. SR N-28 · Structure no. 000000000018110

Built
1959
66 years old, rebuilt 2012
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
154 ft
3 main spans
Daily traffic
11,450
2022 count
Owner
State
State Highway Agency

About this bridge

EB I-80 over SR N-28 is a prestressed concrete stringer/multi-beam or girder carrying EB I-80 over SR N-28 in Cass County, Iowa. It was built in 1959 and reconstructed in 2012, 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 11,450 vehicles a day, roughly 42% of them trucks, projected to reach 11,450 by 2042. The structure is 154 ft (46.9 m) long and 46 ft wide.

Location

Open in Google Maps
CarriesEB I-80
CrossesSR N-28
LocationAt Jct. SR N-28
RouteInterstate 80
CountyCass County
StateIowa
Coordinates41.49731, -94.86894
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating84.7 US tons
Inventory rating37.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length154 ft (46.9 m)
Longest span56 ft (17.1 m)
Deck width46 ft (14.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,450 (2022)
Projected traffic11,450 by 2042
Trucks42%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
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 EB I-80 over SR N-28 built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 2012.

What condition is EB I-80 over SR N-28 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 March 2023.

How much traffic does EB I-80 over SR N-28 carry?

About 11,450 vehicles per day (2022 count), of which roughly 42% are trucks.

How long is EB I-80 over SR N-28?

The structure is 154 ft (46.9 m) long with a longest span of 56 ft (17.1 m) and a deck 46 ft wide.

Who owns EB I-80 over SR N-28?

It is owned by the State Highway Agency.