I-40 WB over 8th Avenue

Fair

Navajo County, Arizona · 6.3 MI W JCT SR 77 · Structure no. 01365

Built: 1969; 56 years old
Condition: Fair; inspected June 2023
Type: Slab; Concrete Continuous
Length: 100 ft; 3 main spans
Daily traffic: 9,375; 2021 count
Owner: State; State Highway Agency

About this bridge

I-40 WB over 8th Avenue is a concrete continuous slab carrying I-40 WB over 8th Avenue in Navajo County, Arizona. It was built in 1969, so it is 56 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 9,375 vehicles a day, roughly 42% of them trucks, projected to reach 9,385 by 2041. The structure is 100 ft (30.5 m) long and 41 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-40 WB

Crosses8th Avenue

Location6.3 MI W JCT SR 77

RouteInterstate 40

CountyNavajo County

StateArizona

Coordinates34.911, -110.1693

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.

Component	Rating	Meaning
Deck	5 Fair	All primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure	5 Fair	All primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure	7 Good	Some minor problems.

Last inspectionJune 2023

Inspection intervalevery 24 months

Operating statusOpen, no restriction

ScourBridge not over waterway

Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is

Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is

Approach roadway alignment8: Equal to present desirable criteria

Operating rating51 US tons

Inventory rating30 US tons

Structure

Structure typeSlab

MaterialConcrete Continuous

DeckConcrete, cast-in-place

Main spans3

Design loadHS 20

Structure length100 ft (30.5 m)

Longest span42 ft (12.8 m)

Deck width41 ft (12.4 m)

Roadway width38 ft (11.5 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,375 (2021)

Projected traffic9,385 by 2041

Trucks42%

Lanes on structure2

Traffic directionOne-way traffic

CarriesHighway

CrossesHighway

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 proposedReplacement because of substandard load-carrying capacity or roadway geometry

Estimated improvement cost—

NavigationNot applicable (no waterway)

Frequently asked questions

When was I-40 WB over 8th Avenue built?

It was built in 1969, making it 56 years old in 2025.

What condition is I-40 WB over 8th Avenue 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 June 2023.

How much traffic does I-40 WB over 8th Avenue carry?

About 9,375 vehicles per day (2021 count), of which roughly 42% are trucks.

How long is I-40 WB over 8th Avenue?

The structure is 100 ft (30.5 m) long with a longest span of 42 ft (12.8 m) and a deck 41 ft wide.

Who owns I-40 WB over 8th Avenue?

It is owned by the State Highway Agency.