US Bridges

I 40; WB over Johnson Canyon

Fair

Coconino County, Arizona · 2.5 MI E JCT SR 89 · Structure no. 00441

Built
1955
70 years old
Condition
Fair
inspected September 2024
Type
Slab
Concrete Continuous
Length
52 ft
2 main spans
Daily traffic
8,187
2021 count
Owner
State
State Highway Agency

About this bridge

I 40; WB over Johnson Canyon is a concrete continuous slab carrying I 40; WB over Johnson Canyon in Coconino County, Arizona. It was built in 1955, so it is 70 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 8,187 vehicles a day, roughly 24% of them trucks, projected to reach 8,197 by 2041. The structure is 52 ft (15.8 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
CrossesJohnson Canyon
Location2.5 MI E JCT SR 89
RouteInterstate 40
CountyCoconino County
StateArizona
Coordinates35.2147, -112.4281
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43 US tons
Inventory rating26 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length52 ft (15.8 m)
Longest span25 ft (7.6 m)
Deck width45 ft (13.7 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,187 (2021)
Projected traffic8,197 by 2041
Trucks24%
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was I 40; WB over Johnson Canyon built?

It was built in 1955, making it 70 years old in 2025.

What condition is I 40; WB over Johnson Canyon 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 September 2024.

How much traffic does I 40; WB over Johnson Canyon carry?

About 8,187 vehicles per day (2021 count), of which roughly 24% are trucks.

How long is I 40; WB over Johnson Canyon?

The structure is 52 ft (15.8 m) long with a longest span of 25 ft (7.6 m) and a deck 45 ft wide.

Who owns I 40; WB over Johnson Canyon?

It is owned by the State Highway Agency.