I-8 EB over Santa Rosa Wash

Fair

Pinal County, Arizona · 11.3 MI E JCT SR 84 · Structure no. 01092

Built: 1965; 60 years old
Condition: Fair; inspected February 2024
Type: Slab; Concrete Continuous
Length: 620 ft; 18 main spans
Daily traffic: 3,369; 2022 count
Owner: State; State Highway Agency

About this bridge

I-8 EB over Santa Rosa Wash is a concrete continuous slab carrying I-8 EB over Santa Rosa Wash in Pinal County, Arizona. It was built in 1965, so it is 60 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 3,369 vehicles a day, roughly 19% of them trucks, projected to reach 3,379 by 2042. The structure is 620 ft (189 m) long and 35 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-8 EB

CrossesSanta Rosa Wash

Location11.3 MI E JCT SR 84

RouteInterstate 8

CountyPinal County

StateArizona

Coordinates32.82807, -111.9382

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.

Component	Rating	Meaning
Deck	6 Satisfactory	Structural elements show some minor deterioration.
Superstructure	6 Satisfactory	Structural elements show some minor deterioration.
Substructure	6 Satisfactory	Structural elements show some minor deterioration.
Channel and channel protection	6 Satisfactory	Structural elements show some minor deterioration.

Last inspectionFebruary 2024

Inspection intervalevery 24 months

Operating statusOpen, no restriction

ScourCountermeasures installed to correct a previously existing problem

Structural evaluation6: Equal to present minimum criteria

Deck geometry4: Meets minimum tolerable limits to be left in place as is

Waterway adequacy7: Better than present minimum criteria

Approach roadway alignment8: Equal to present desirable criteria

Operating rating65 US tons

Inventory rating39 US tons

Structure

Structure typeSlab

MaterialConcrete Continuous

DeckConcrete, cast-in-place

Main spans18

Design loadHS 20

Structure length620 ft (189 m)

Longest span35 ft (10.7 m)

Deck width35 ft (10.7 m)

Roadway width32 ft (9.8 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,369 (2022)

Projected traffic3,379 by 2042

Trucks19%

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 EB over Santa Rosa Wash built?

It was built in 1965, making it 60 years old in 2025.

What condition is I-8 EB over Santa Rosa 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 February 2024.

How much traffic does I-8 EB over Santa Rosa Wash carry?

About 3,369 vehicles per day (2022 count), of which roughly 19% are trucks.

How long is I-8 EB over Santa Rosa Wash?

The structure is 620 ft (189 m) long with a longest span of 35 ft (10.7 m) and a deck 35 ft wide.

Who owns I-8 EB over Santa Rosa Wash?

It is owned by the State Highway Agency.