WB I-80 over 50th Street

Fair

Poweshiek County, Iowa · 2.1 Mi. E of JCT Ia 146 · Structure no. 000000000046110

Built: 1963; 62 years old
Condition: Fair; inspected June 2023
Type: Slab; Concrete Continuous
Length: 114 ft; 3 main spans
Daily traffic: 14,000; 2022 count
Owner: State; State Highway Agency

About this bridge

WB I-80 over 50th Street is a concrete continuous slab carrying WB I-80 over 50th Street in Poweshiek County, Iowa. It was built in 1963, so it is 62 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 14,000 vehicles a day, roughly 39% of them trucks, projected to reach 14,000 by 2042. The structure is 114 ft (34.7 m) long and 46 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesWB I-80

Crosses50th Street

Location2.1 Mi. E of JCT Ia 146

RouteInterstate 80

CountyPoweshiek County

StateIowa

Coordinates41.69552, -92.68829

Functional classRural 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.

Component	Rating	Meaning
Deck	5 Fair	All primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure	5 Fair	All primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure	6 Satisfactory	Structural elements show some minor deterioration.

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 geometry7: Better than present minimum criteria

Approach roadway alignment8: Equal to present desirable criteria

Operating rating49.1 US tons

Inventory rating29.5 US tons

Structure

Structure typeSlab

MaterialConcrete Continuous

DeckConcrete, cast-in-place

Main spans3

Design loadHS 20

Structure length114 ft (34.7 m)

Longest span44 ft (13.4 m)

Deck width46 ft (14 m)

Roadway width40 ft (12.2 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,000 (2022)

Projected traffic14,000 by 2042

Trucks39%

Lanes on structure2

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 50th Street built?

It was built in 1963, making it 62 years old in 2025.

What condition is WB I-80 over 50th Street 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 50th Street carry?

About 14,000 vehicles per day (2022 count), of which roughly 39% are trucks.

How long is WB I-80 over 50th Street?

The structure is 114 ft (34.7 m) long with a longest span of 44 ft (13.4 m) and a deck 46 ft wide.

Who owns WB I-80 over 50th Street?

It is owned by the State Highway Agency.