US Bridges

I-40 EB over Griffith Wash

Fair

Mohave County, Arizona · 8.5 MI S JCT US 93 · Structure no. 00369

Built
1949
76 years old, rebuilt 1974
Condition
Fair
inspected May 2024
Type
Slab
Concrete Continuous
Length
140 ft
5 main spans
Daily traffic
6,984
2022 count
Owner
State
State Highway Agency

About this bridge

I-40 EB over Griffith Wash is a concrete continuous slab carrying I-40 EB over Griffith Wash in Mohave County, Arizona. It was built in 1949 and reconstructed in 1974, so it is 76 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 6,984 vehicles a day, roughly 40% of them trucks, projected to reach 6,994 by 2042. The structure is 140 ft (42.7 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 EB
CrossesGriffith Wash
Location8.5 MI S JCT US 93
RouteInterstate 40
CountyMohave County
StateArizona
Coordinates35.082, -114.1211
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 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 rating44 US tons
Inventory rating26 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length140 ft (42.7 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 traffic6,984 (2022)
Projected traffic6,994 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 EB over Griffith Wash built?

It was built in 1949, making it 76 years old in 2025. It was reconstructed in 1974.

What condition is I-40 EB over Griffith 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 EB over Griffith Wash carry?

About 6,984 vehicles per day (2022 count), of which roughly 40% are trucks.

How long is I-40 EB over Griffith Wash?

The structure is 140 ft (42.7 m) long with a longest span of 30 ft (9.1 m) and a deck 45 ft wide.

Who owns I-40 EB over Griffith Wash?

It is owned by the State Highway Agency.