US Bridges

28th ST over I-235

Good

Polk County, Iowa · 1.8 Mi. E of W Jct. 35/80 · Structure no. 000000000042191

Built
2005
20 years old
Condition
Good
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
275 ft
2 main spans
Daily traffic
4,783
2022 count
Owner
State
State Highway Agency

About this bridge

28th ST over I-235 is a prestressed concrete stringer/multi-beam or girder carrying 28th ST over I-235 in Polk County, Iowa. It was built in 2005, so it is 20 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 4,783 vehicles a day, projected to reach 4,783 by 2043. The structure is 275 ft (83.8 m) long and 39 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
Carries28th ST
CrossesI-235
Location1.8 Mi. E of W Jct. 35/80
RouteCity Street 0
CountyPolk County
StateIowa
Coordinates41.59201, -93.74216
Functional classUrban Local

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.
Substructure8 Very GoodNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99.8 US tons
Inventory rating51.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length275 ft (83.8 m)
Longest span136 ft (41.5 m)
Deck width39 ft (12 m)
Roadway width30 ft (9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,783 (2022)
Projected traffic4,783 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

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 28th ST over I-235 built?

It was built in 2005, making it 20 years old in 2025.

What condition is 28th ST over I-235 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 October 2023.

How much traffic does 28th ST over I-235 carry?

About 4,783 vehicles per day (2022 count).

How long is 28th ST over I-235?

The structure is 275 ft (83.8 m) long with a longest span of 136 ft (41.5 m) and a deck 39 ft wide.

Who owns 28th ST over I-235?

It is owned by the State Highway Agency.