US Bridges

50th St-St Farm over I-235

Good

Polk County, Iowa · 0.3 Mi. E of W Jct. I-235 · Structure no. 000000000012511

Built
2000
25 years old
Condition
Good
inspected December 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
341 ft
4 main spans
Daily traffic
18,366
2022 count
Owner
State
State Highway Agency

About this bridge

50th St-St Farm over I-235 is a prestressed concrete stringer/multi-beam or girder carrying 50th St-St Farm over I-235 in Polk County, Iowa. It was built in 2000, so it is 25 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 18,366 vehicles a day, roughly 1% of them trucks, projected to reach 18,366 by 2043. The structure is 341 ft (103.9 m) long and 82 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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Carries50th St-St Farm
CrossesI-235
Location0.3 Mi. E of W Jct. I-235
RouteCity Street 0
CountyPolk County
StateIowa
Coordinates41.59174, -93.77116
Functional classUrban Minor Arterial

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 inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating87.1 US tons
Inventory rating42.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length341 ft (103.9 m)
Longest span93 ft (28.3 m)
Deck width82 ft (25.1 m)
Roadway width68 ft (20.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,366 (2022)
Projected traffic18,366 by 2043
Trucks1%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
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 50th St-St Farm over I-235 built?

It was built in 2000, making it 25 years old in 2025.

What condition is 50th St-St Farm 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 December 2023.

How much traffic does 50th St-St Farm over I-235 carry?

About 18,366 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is 50th St-St Farm over I-235?

The structure is 341 ft (103.9 m) long with a longest span of 93 ft (28.3 m) and a deck 82 ft wide.

Who owns 50th St-St Farm over I-235?

It is owned by the State Highway Agency.