US Bridges

I-40 WB over SB 40

Poor

Navajo County, Arizona · 3.0 MI W JCT SR 77 · Structure no. 01370

Built
1969
56 years old
Condition
Poor
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
268 ft
3 main spans
Daily traffic
21,131
2022 count
Owner
State
State Highway Agency

About this bridge

I-40 WB over SB 40 is a steel continuous stringer/multi-beam or girder carrying I-40 WB over SB 40 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 21,131 vehicles a day, roughly 15% of them trucks, projected to reach 21,141 by 2042. The structure is 268 ft (81.7 m) long and 41 ft wide.

Location

Open in Google Maps
CarriesI-40 WB
CrossesSB 40
Location3.0 MI W JCT SR 77
RouteInterstate 40
CountyNavajo County
StateArizona
Coordinates34.9392, -110.1292
Functional classRural Principal Arterial - Interstate

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67 US tons
Inventory rating40 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length268 ft (81.7 m)
Longest span100 ft (30.5 m)
Deck width41 ft (12.4 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21,131 (2022)
Projected traffic21,141 by 2042
Trucks15%
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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$990,000 (2023 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-40 WB over SB 40 built?

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

What condition is I-40 WB over SB 40 in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2023.

How much traffic does I-40 WB over SB 40 carry?

About 21,131 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is I-40 WB over SB 40?

The structure is 268 ft (81.7 m) long with a longest span of 100 ft (30.5 m) and a deck 41 ft wide.

Who owns I-40 WB over SB 40?

It is owned by the State Highway Agency.