US Bridges

NB US 59 over I-80

Fair

Pottawattamie County, Iowa · At Jct. I-80 · Structure no. 000000000043470

Built
1965
60 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
239 ft
4 main spans
Daily traffic
2,900
2023 count
Owner
State
State Highway Agency

About this bridge

NB US 59 over I-80 is a prestressed concrete stringer/multi-beam or girder carrying NB US 59 over I-80 in Pottawattamie County, Iowa. It was built in 1965, so it is 60 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 2,900 vehicles a day, roughly 17% of them trucks, projected to reach 2,900 by 2043. The structure is 239 ft (72.8 m) long and 36 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesNB US 59
CrossesI-80
LocationAt Jct. I-80
RouteU.S. Route 59
CountyPottawattamie County
StateIowa
Coordinates41.49728, -95.33635
Functional classRural Principal Arterial - Other

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating78.6 US tons
Inventory rating27.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length239 ft (72.8 m)
Longest span69 ft (21 m)
Deck width36 ft (11 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,900 (2023)
Projected traffic2,900 by 2043
Trucks17%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 NB US 59 over I-80 built?

It was built in 1965, making it 60 years old in 2025.

What condition is NB US 59 over I-80 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 August 2024.

How much traffic does NB US 59 over I-80 carry?

About 2,900 vehicles per day (2023 count), of which roughly 17% are trucks.

How long is NB US 59 over I-80?

The structure is 239 ft (72.8 m) long with a longest span of 69 ft (21 m) and a deck 36 ft wide.

Who owns NB US 59 over I-80?

It is owned by the State Highway Agency.