US Bridges

I-40 WB over B 40

Fair

Navajo County, Arizona · 7.6 MI W JCT SR 77 · Structure no. 01775

Built
1977
48 years old
Condition
Fair
inspected June 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
140 ft
1 main span
Daily traffic
11,092
2021 count
Owner
State
State Highway Agency

About this bridge

I-40 WB over B 40 is a prestressed concrete box beam or girders - single or spread carrying I-40 WB over B 40 in Navajo County, Arizona. It was built in 1977, so it is 48 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 11,092 vehicles a day, roughly 40% of them trucks, projected to reach 11,102 by 2041. The structure is 140 ft (42.7 m) long and 45 ft wide.

Location

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CarriesI-40 WB
CrossesB 40
Location7.6 MI W JCT SR 77
RouteInterstate 40
CountyNavajo County
StateArizona
Coordinates34.906, -110.1861
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.
Substructure7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating80 US tons
Inventory rating36 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length140 ft (42.7 m)
Longest span138 ft (42.1 m)
Deck width45 ft (13.6 m)
Roadway width42 ft (12.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,092 (2021)
Projected traffic11,102 by 2041
Trucks40%
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 B 40 built?

It was built in 1977, making it 48 years old in 2025.

What condition is I-40 WB over B 40 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 B 40 carry?

About 11,092 vehicles per day (2021 count), of which roughly 40% are trucks.

How long is I-40 WB over B 40?

The structure is 140 ft (42.7 m) long with a longest span of 138 ft (42.1 m) and a deck 45 ft wide.

Who owns I-40 WB over B 40?

It is owned by the State Highway Agency.