US Bridges

NB I-35/EB I-80 over Ia 28

Good

Polk County, Iowa · At Jct. Ia 28 · Structure no. 000000000041441

Built
1999
26 years old
Condition
Good
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
266 ft
2 main spans
Daily traffic
40,100
2023 count
Owner
State
State Highway Agency

About this bridge

NB I-35/EB I-80 over Ia 28 is a steel continuous stringer/multi-beam or girder carrying NB I-35/EB I-80 over Ia 28 in Polk County, Iowa. It was built in 1999, so it is 26 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 40,100 vehicles a day, roughly 24% of them trucks, projected to reach 40,100 by 2043. The structure is 266 ft (81.1 m) long and 63 ft wide.

Location

Open in Google Maps
CarriesNB I-35/EB I-80
CrossesIa 28
LocationAt Jct. Ia 28
RouteInterstate 80
CountyPolk County
StateIowa
Coordinates41.65205, -93.69816
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating71.4 US tons
Inventory rating42.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length266 ft (81.1 m)
Longest span131 ft (39.9 m)
Deck width63 ft (19.3 m)
Roadway width60 ft (18.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40,100 (2023)
Projected traffic40,100 by 2043
Trucks24%
Lanes on structure3
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 NB I-35/EB I-80 over Ia 28 built?

It was built in 1999, making it 26 years old in 2025.

What condition is NB I-35/EB I-80 over Ia 28 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2023.

How much traffic does NB I-35/EB I-80 over Ia 28 carry?

About 40,100 vehicles per day (2023 count), of which roughly 24% are trucks.

How long is NB I-35/EB I-80 over Ia 28?

The structure is 266 ft (81.1 m) long with a longest span of 131 ft (39.9 m) and a deck 63 ft wide.

Who owns NB I-35/EB I-80 over Ia 28?

It is owned by the State Highway Agency.