US Bridges

NB I-35 EB I-80 over 6th Ave

Fair

Polk County, Iowa · 0.4 Mi. W of Jct. Ia 415 · Structure no. 000000000041570

Built
1958
67 years old, rebuilt 1991
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
141 ft
3 main spans
Daily traffic
44,550
2023 count
Owner
State
State Highway Agency

About this bridge

NB I-35 EB I-80 over 6th Ave is a prestressed concrete stringer/multi-beam or girder carrying NB I-35 EB I-80 over 6th Ave in Polk County, Iowa. It was built in 1958 and reconstructed in 1991, so it is 67 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 44,550 vehicles a day, roughly 21% of them trucks, projected to reach 44,550 by 2043. The structure is 141 ft (43 m) long and 67 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesNB I-35 EB I-80
Crosses6th Ave
Location0.4 Mi. W of Jct. Ia 415
RouteInterstate 80
CountyPolk County
StateIowa
Coordinates41.64939, -93.62816
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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 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 geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70.4 US tons
Inventory rating32 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length141 ft (43 m)
Longest span52 ft (15.9 m)
Deck width67 ft (20.3 m)
Roadway width62 ft (19 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic44,550 (2023)
Projected traffic44,550 by 2043
Trucks21%
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 NB I-35 EB I-80 over 6th Ave built?

It was built in 1958, making it 67 years old in 2025. It was reconstructed in 1991.

What condition is NB I-35 EB I-80 over 6th Ave 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 NB I-35 EB I-80 over 6th Ave carry?

About 44,550 vehicles per day (2023 count), of which roughly 21% are trucks.

How long is NB I-35 EB I-80 over 6th Ave?

The structure is 141 ft (43 m) long with a longest span of 52 ft (15.9 m) and a deck 67 ft wide.

Who owns NB I-35 EB I-80 over 6th Ave?

It is owned by the State Highway Agency.