I-40 WB over Griffith Wash

Good

Mohave County, Arizona · 8.5 MI W JCT US 93 · Structure no. 01658

Built: 1974; 51 years old
Condition: Good; inspected May 2024
Type: Slab; Concrete Continuous
Length: 141 ft; 5 main spans
Daily traffic: 7,765; 2022 count
Owner: State; State Highway Agency

About this bridge

I-40 WB over Griffith Wash is a concrete continuous slab carrying I-40 WB over Griffith Wash in Mohave County, Arizona. It was built in 1974, so it is 51 years old, older than the Arizona average of 47.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 7,765 vehicles a day, roughly 40% of them trucks, projected to reach 7,775 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

CrossesGriffith Wash

Location8.5 MI W JCT US 93

RouteInterstate 40

CountyMohave County

StateArizona

Coordinates35.082, -114.1218

Functional classRural Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

Component	Rating	Meaning
Deck	8 Very Good	No problems noted.
Superstructure	8 Very Good	No problems noted.
Substructure	7 Good	Some minor problems.
Channel and channel protection	7 Good	Some minor problems.

Last inspectionMay 2024

Inspection intervalevery 24 months

Operating statusOpen, no restriction

ScourCountermeasures installed to correct a previously existing problem

Structural evaluation7: Better than 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 rating68 US tons

Inventory rating40 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 traffic7,765 (2022)

Projected traffic7,775 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 Griffith Wash built?

It was built in 1974, making it 51 years old in 2025.

What condition is I-40 WB over Griffith Wash in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2024.

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

About 7,765 vehicles per day (2022 count), of which roughly 40% are trucks.

How long is I-40 WB over Griffith 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 Griffith Wash?

It is owned by the State Highway Agency.