US Bridges

FM X-46 over I-80

Fair

Cedar County, Iowa · 2.0 Mi. W of W Jct. Ia 38 · Structure no. 000000000018600

Built
1960
65 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
218 ft
4 main spans
Daily traffic
620
2022 count
Owner
State
State Highway Agency

About this bridge

FM X-46 over I-80 is a prestressed concrete stringer/multi-beam or girder carrying FM X-46 over I-80 in Cedar County, Iowa. It was built in 1960, so it is 65 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 6 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 620 vehicles a day, roughly 56% of them trucks, projected to reach 620 by 2043. The structure is 218 ft (66.4 m) long and 34 ft wide. If it were closed, the detour would be 19.3 mi (31 km).

Location

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CarriesFM X-46
CrossesI-80
Location2.0 Mi. W of W Jct. Ia 38
RouteCounty Highway 0
CountyCedar County
StateIowa
Coordinates41.64576, -91.15187
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating72.8 US tons
Inventory rating31.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length218 ft (66.4 m)
Longest span65 ft (19.8 m)
Deck width34 ft (10.4 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic620 (2022)
Projected traffic620 by 2043
Trucks56%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed19.3 mi (31 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 FM X-46 over I-80 built?

It was built in 1960, making it 65 years old in 2025.

What condition is FM X-46 over I-80 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 October 2023.

How much traffic does FM X-46 over I-80 carry?

About 620 vehicles per day (2022 count), of which roughly 56% are trucks.

How long is FM X-46 over I-80?

The structure is 218 ft (66.4 m) long with a longest span of 65 ft (19.8 m) and a deck 34 ft wide.

Who owns FM X-46 over I-80?

It is owned by the State Highway Agency.