US Bridges

I-40 WB over Twin Wash

Fair

Navajo County, Arizona · 6.0 MI E JCT SR 77 · Structure no. 05984

Built
1959
66 years old
Condition
Fair
inspected June 2021
Type
Culvert
Concrete Continuous
Length
55 ft
5 main spans
Daily traffic
9,800
2021 count
Owner
State
State Highway Agency

About this bridge

I-40 WB over Twin Wash is a concrete continuous culvert carrying I-40 WB over Twin Wash in Navajo County, Arizona. It was built in 1959, so it is 66 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 9,800 vehicles a day, roughly 40% of them trucks, projected to reach 9,810 by 2041. The structure is 55 ft (16.8 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-40 WB
CrossesTwin Wash
Location6.0 MI E JCT SR 77
RouteInterstate 40
CountyNavajo County
StateArizona
Coordinates34.9913, -109.9834
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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating79 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans5
Design loadHS 20
Structure length55 ft (16.8 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,800 (2021)
Projected traffic9,810 by 2041
Trucks40%
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 Twin Wash built?

It was built in 1959, making it 66 years old in 2025.

What condition is I-40 WB over Twin Wash 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 2021.

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

About 9,800 vehicles per day (2021 count), of which roughly 40% are trucks.

How long is I-40 WB over Twin Wash?

The structure is 55 ft (16.8 m) long with a longest span of 10 ft (3 m).

Who owns I-40 WB over Twin Wash?

It is owned by the State Highway Agency.