I-40 WB over SR 77

Fair

Navajo County, Arizona · At JCT SR 77 · Structure no. 00904

Built: 1967; 58 years old, rebuilt 2012
Condition: Fair; inspected June 2023
Type: Slab; Concrete Continuous
Length: 108 ft; 3 main spans
Daily traffic: 10,197; 2021 count
Owner: State; State Highway Agency

About this bridge

I-40 WB over SR 77 is a concrete continuous slab carrying I-40 WB over SR 77 in Navajo County, Arizona. It was built in 1967 and reconstructed in 2012, so it is 58 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 10,197 vehicles a day, roughly 42% of them trucks, projected to reach 10,207 by 2041. The structure is 108 ft (32.9 m) long and 45 ft wide.

Location

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CarriesI-40 WB

CrossesSR 77

LocationAt JCT SR 77

RouteInterstate 40

CountyNavajo County

StateArizona

Coordinates34.9735, -110.0871

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	7 Good	Some minor problems.
Superstructure	7 Good	Some minor problems.
Substructure	6 Satisfactory	Structural elements show some minor deterioration.

Last inspectionJune 2023

Inspection intervalevery 24 months

Operating statusOpen, no restriction

ScourBridge not over waterway

Structural evaluation6: Equal to present minimum criteria

Deck geometry8: Equal to present desirable criteria

Approach roadway alignment7: Better than present minimum criteria

Operating rating99 US tons

Inventory rating78 US tons

Structure

Structure typeSlab

MaterialConcrete Continuous

DeckConcrete, cast-in-place

Main spans3

Design loadHS 20

Structure length108 ft (32.9 m)

Longest span40 ft (12.2 m)

Deck width45 ft (13.7 m)

Roadway width42 ft (12.8 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,197 (2021)

Projected traffic10,207 by 2041

Trucks42%

Lanes on structure2

Traffic directionOne-way traffic

CarriesOverpass structure at an interchange

CrossesHighway

Detour if closed—

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—

NavigationNot applicable (no waterway)

Frequently asked questions

When was I-40 WB over SR 77 built?

It was built in 1967, making it 58 years old in 2025. It was reconstructed in 2012.

What condition is I-40 WB over SR 77 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 SR 77 carry?

About 10,197 vehicles per day (2021 count), of which roughly 42% are trucks.

How long is I-40 WB over SR 77?

The structure is 108 ft (32.9 m) long with a longest span of 40 ft (12.2 m) and a deck 45 ft wide.

Who owns I-40 WB over SR 77?

It is owned by the State Highway Agency.