US Bridges

I 8 over Wash

Good

Maricopa County, Arizona · 2.2 MI E JCT SR 85 · Structure no. 06497

Built
1970
55 years old, rebuilt 1973
Condition
Good
inspected March 2023
Type
Culvert
Concrete Continuous
Length
59 ft
4 main spans
Daily traffic
6,664
2021 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 1970 and reconstructed in 1973, so it is 55 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 6,664 vehicles a day, roughly 27% of them trucks, projected to reach 6,674 by 2041. The structure is 59 ft (18 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI 8
CrossesWash
Location2.2 MI E JCT SR 85
RouteInterstate 8
CountyMaricopa County
StateArizona
Coordinates32.93108, -112.6977
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
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating83 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans4
Design loadHS 20
Structure length59 ft (18 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,664 (2021)
Projected traffic6,674 by 2041
Trucks27%
Lanes on structure4
Traffic directionTwo-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 over Wash built?

It was built in 1970, making it 55 years old in 2025. It was reconstructed in 1973.

What condition is I 8 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 March 2023.

How much traffic does I 8 over Wash carry?

About 6,664 vehicles per day (2021 count), of which roughly 27% are trucks.

How long is I 8 over Wash?

The structure is 59 ft (18 m) long with a longest span of 12 ft (3.7 m).

Who owns I 8 over Wash?

It is owned by the State Highway Agency.