I 8; WB over Wash

Good

Maricopa County, Arizona · 26.9 MI E JCT SR 85 · Structure no. 05298

Built: 1959; 66 years old, rebuilt 1980
Condition: Good; inspected January 2023
Type: Culvert; Concrete Continuous
Length: 65 ft; 6 main spans
Daily traffic: 3,373; 2021 count
Owner: State; State Highway Agency

About this bridge

I 8; WB over Wash is a concrete continuous culvert carrying I 8; WB over Wash in Maricopa County, Arizona. It was built in 1959 and reconstructed in 1980, 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 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 3,373 vehicles a day, roughly 42% of them trucks, projected to reach 3,383 by 2041. The structure is 65 ft (19.8 m) long and 46 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI 8; WB

CrossesWash

Location26.9 MI E JCT SR 85

RouteInterstate 8

CountyMaricopa County

StateArizona

Coordinates32.8463, -112.2897

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.

Component	Rating	Meaning
Channel and channel protection	7 Good	Some minor problems.
Culvert	7 Good	Some minor problems.

Last inspectionJanuary 2023

Inspection intervalevery 48 months

Operating statusOpen, no restriction

ScourFoundations stable; scour above top of footing

Structural evaluation7: Better than present minimum criteria

Deck geometry6: Equal to present minimum criteria

Waterway adequacy8: Equal to present desirable criteria

Approach roadway alignment8: Equal to present desirable criteria

Operating rating59 US tons

Inventory rating35.1 US tons

Structure

Structure typeCulvert

MaterialConcrete Continuous

DeckConcrete, cast-in-place

Main spans6

Design loadHS 20

Structure length65 ft (19.8 m)

Longest span10 ft (3 m)

Deck width46 ft (14 m)

Roadway width38 ft (11.6 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,373 (2021)

Projected traffic3,383 by 2041

Trucks42%

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 8; WB over Wash built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 1980.

What condition is I 8; WB over 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 January 2023.

How much traffic does I 8; WB over Wash carry?

About 3,373 vehicles per day (2021 count), of which roughly 42% are trucks.

How long is I 8; WB over Wash?

The structure is 65 ft (19.8 m) long with a longest span of 10 ft (3 m) and a deck 46 ft wide.

Who owns I 8; WB over Wash?

It is owned by the State Highway Agency.