US Bridges

I-40 WB over Cottonwood Wash

Good

Navajo County, Arizona · 1.8 MI E JCT SR 87 · Structure no. 00520

Built
1958
67 years old, rebuilt 1980
Condition
Good
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
402 ft
8 main spans
Daily traffic
10,681
2021 count
Owner
State
State Highway Agency

About this bridge

I-40 WB over Cottonwood Wash is a prestressed concrete stringer/multi-beam or girder carrying I-40 WB over Cottonwood Wash in Navajo County, Arizona. It was built in 1958 and reconstructed in 1980, so it is 67 years old, older than the Arizona average of 47.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 10,681 vehicles a day, roughly 34% of them trucks, projected to reach 10,691 by 2041. The structure is 402 ft (122.5 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
CrossesCottonwood Wash
Location1.8 MI E JCT SR 87
RouteInterstate 40
CountyNavajo County
StateArizona
Coordinates35.0044, -110.6107
Functional classRural Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation7: Better than present minimum criteria
Deck geometry8: Equal to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating99 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans8
Design loadHS 20
Structure length402 ft (122.5 m)
Longest span50 ft (15.2 m)
Deck width45 ft (13.8 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,681 (2021)
Projected traffic10,691 by 2041
Trucks34%
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 WB over Cottonwood Wash built?

It was built in 1958, making it 67 years old in 2025. It was reconstructed in 1980.

What condition is I-40 WB over Cottonwood Wash in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2023.

How much traffic does I-40 WB over Cottonwood Wash carry?

About 10,681 vehicles per day (2021 count), of which roughly 34% are trucks.

How long is I-40 WB over Cottonwood Wash?

The structure is 402 ft (122.5 m) long with a longest span of 50 ft (15.2 m) and a deck 45 ft wide.

Who owns I-40 WB over Cottonwood Wash?

It is owned by the State Highway Agency.