US Bridges

WB I-80 over NE 29th ST

Fair

Polk County, Iowa · 0.7 Mi. E of E Jct. I-35 · Structure no. 000000000041960

Built
1959
66 years old, rebuilt 1992
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
312 ft
6 main spans
Daily traffic
44,500
2022 count
Owner
State
State Highway Agency

About this bridge

WB I-80 over NE 29th ST is a prestressed concrete stringer/multi-beam or girder carrying WB I-80 over NE 29th ST in Polk County, Iowa. It was built in 1959 and reconstructed in 1992, 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 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 44,500 vehicles a day, roughly 18% of them trucks, projected to reach 44,500 by 2042. The structure is 312 ft (95.1 m) long and 59 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesWB I-80
CrossesNE 29th ST
Location0.7 Mi. E of E Jct. I-35
RouteInterstate 80
CountyPolk County
StateIowa
Coordinates41.65446, -93.5604
Functional classUrban 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating80.4 US tons
Inventory rating42.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length312 ft (95.1 m)
Longest span65 ft (19.8 m)
Deck width59 ft (18.1 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic44,500 (2022)
Projected traffic44,500 by 2042
Trucks18%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was WB I-80 over NE 29th ST built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 1992.

What condition is WB I-80 over NE 29th ST 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 June 2023.

How much traffic does WB I-80 over NE 29th ST carry?

About 44,500 vehicles per day (2022 count), of which roughly 18% are trucks.

How long is WB I-80 over NE 29th ST?

The structure is 312 ft (95.1 m) long with a longest span of 65 ft (19.8 m) and a deck 59 ft wide.

Who owns WB I-80 over NE 29th ST?

It is owned by the State Highway Agency.