US Bridges

I-40 WB over Flat Top Wash

Fair

Mohave County, Arizona · 11.2 MI E JCT SR 95 · Structure no. 01312

Built
1951
74 years old, rebuilt 1989
Condition
Fair
inspected May 2024
Type
Slab
Concrete Continuous
Length
142 ft
5 main spans
Daily traffic
7,333
2022 count
Owner
State
State Highway Agency

About this bridge

I-40 WB over Flat Top Wash is a concrete continuous slab carrying I-40 WB over Flat Top Wash in Mohave County, Arizona. It was built in 1951 and reconstructed in 1989, so it is 74 years old, older than the Arizona average of 47.8 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 7,333 vehicles a day, roughly 55% of them trucks, projected to reach 7,343 by 2042. The structure is 142 ft (43.3 m) long and 45 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-40 WB
CrossesFlat Top Wash
Location11.2 MI E JCT SR 95
RouteInterstate 40
CountyMohave County
StateArizona
Coordinates34.8059, -114.1515
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.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry8: Equal to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating45 US tons
Inventory rating27 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length142 ft (43.3 m)
Longest span30 ft (9.1 m)
Deck width45 ft (13.8 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,333 (2022)
Projected traffic7,343 by 2042
Trucks55%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was I-40 WB over Flat Top Wash built?

It was built in 1951, making it 74 years old in 2025. It was reconstructed in 1989.

What condition is I-40 WB over Flat Top Wash 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 May 2024.

How much traffic does I-40 WB over Flat Top Wash carry?

About 7,333 vehicles per day (2022 count), of which roughly 55% are trucks.

How long is I-40 WB over Flat Top Wash?

The structure is 142 ft (43.3 m) long with a longest span of 30 ft (9.1 m) and a deck 45 ft wide.

Who owns I-40 WB over Flat Top Wash?

It is owned by the State Highway Agency.