US Bridges

I-40 EB over Canyon Diablo

Fair

Coconino County, Arizona · 15.5 MI W JCT SR 99 · Structure no. 01671

Built
1940
85 years old, rebuilt 1976
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
224 ft
3 main spans
Daily traffic
11,735
2022 count
Owner
State
State Highway Agency

About this bridge

I-40 EB over Canyon Diablo is a steel continuous stringer/multi-beam or girder carrying I-40 EB over Canyon Diablo in Coconino County, Arizona. It was built in 1940 and reconstructed in 1976, so it is 85 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 11,735 vehicles a day, roughly 49% of them trucks, projected to reach 11,745 by 2042. The structure is 224 ft (68.3 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
CrossesCanyon Diablo
Location15.5 MI W JCT SR 99
RouteInterstate 40
CountyCoconino County
StateArizona
Coordinates35.1174, -111.1001
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating35.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length224 ft (68.3 m)
Longest span83 ft (25.3 m)
Deck width45 ft (13.6 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,735 (2022)
Projected traffic11,745 by 2042
Trucks49%
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 Canyon Diablo built?

It was built in 1940, making it 85 years old in 2025. It was reconstructed in 1976.

What condition is I-40 EB over Canyon Diablo 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 October 2024.

How much traffic does I-40 EB over Canyon Diablo carry?

About 11,735 vehicles per day (2022 count), of which roughly 49% are trucks.

How long is I-40 EB over Canyon Diablo?

The structure is 224 ft (68.3 m) long with a longest span of 83 ft (25.3 m) and a deck 45 ft wide.

Who owns I-40 EB over Canyon Diablo?

It is owned by the State Highway Agency.