US Bridges

I 8 over Wash

Fair

Maricopa County, Arizona · 3.6 MI W JCT SR 85 · Structure no. 05273

Built
1938
87 years old, rebuilt 1981
Condition
Fair
inspected March 2023
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
14,459
2022 count
Owner
State
State Highway Agency

About this bridge

I 8 over Wash is a concrete continuous culvert carrying I 8 over Wash in Maricopa County, Arizona. It was built in 1938 and reconstructed in 1981, so it is 87 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 14,459 vehicles a day, roughly 23% of them trucks, projected to reach 14,469 by 2042. The structure is 21 ft (6.4 m) long. If it were closed, the detour would be 9.9 mi (16 km).

Location

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CarriesI 8
CrossesWash
Location3.6 MI W JCT SR 85
RouteInterstate 8
CountyMaricopa County
StateArizona
Coordinates32.93337, -112.79412
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 protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67 US tons
Inventory rating40 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length21 ft (6.4 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 traffic14,459 (2022)
Projected traffic14,469 by 2042
Trucks23%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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$2,000
NavigationNo navigation control on waterway

Frequently asked questions

When was I 8 over Wash built?

It was built in 1938, making it 87 years old in 2025. It was reconstructed in 1981.

What condition is I 8 over 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 March 2023.

How much traffic does I 8 over Wash carry?

About 14,459 vehicles per day (2022 count), of which roughly 23% are trucks.

How long is I 8 over Wash?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m).

Who owns I 8 over Wash?

It is owned by the State Highway Agency.