US Bridges

I-40 WB over Boulder Wash

Fair

Mohave County, Arizona · 1.3 MI E JCT SR 95 · Structure no. 01588

Built
1972
53 years old
Condition
Fair
inspected April 2024
Type
Slab
Concrete Continuous
Length
141 ft
5 main spans
Daily traffic
8,739
2022 count
Owner
State
State Highway Agency

About this bridge

I-40 WB over Boulder Wash is a concrete continuous slab carrying I-40 WB over Boulder Wash in Mohave County, Arizona. It was built in 1972, so it is 53 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 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 8,739 vehicles a day, roughly 40% of them trucks, projected to reach 8,749 by 2042. The structure is 141 ft (43 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
CrossesBoulder Wash
Location1.3 MI E JCT SR 95
RouteInterstate 40
CountyMohave County
StateArizona
Coordinates34.7304, -114.2945
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry8: Equal to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70 US tons
Inventory rating42 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length141 ft (43 m)
Longest span30 ft (9.1 m)
Deck width45 ft (13.6 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,739 (2022)
Projected traffic8,749 by 2042
Trucks40%
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 Boulder Wash built?

It was built in 1972, making it 53 years old in 2025.

What condition is I-40 WB over Boulder 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 April 2024.

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

About 8,739 vehicles per day (2022 count), of which roughly 40% are trucks.

How long is I-40 WB over Boulder Wash?

The structure is 141 ft (43 m) long with a longest span of 30 ft (9.1 m) and a deck 45 ft wide.

Who owns I-40 WB over Boulder Wash?

It is owned by the State Highway Agency.