US Bridges

I-8 WB over Santa Cruz Wash

Fair

Pinal County, Arizona · 7.4 MI W JCT I-10 · Structure no. 01143

Built
1966
59 years old
Condition
Fair
inspected February 2024
Type
Slab
Concrete Continuous
Length
351 ft
12 main spans
Daily traffic
3,020
2023 count
Owner
State
State Highway Agency

About this bridge

I-8 WB over Santa Cruz Wash is a concrete continuous slab carrying I-8 WB over Santa Cruz Wash in Pinal County, Arizona. It was built in 1966, so it is 59 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 3,020 vehicles a day, roughly 19% of them trucks, projected to reach 3,030 by 2042. The structure is 351 ft (107 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 WB
CrossesSanta Cruz Wash
Location7.4 MI W JCT I-10
RouteInterstate 8
CountyPinal County
StateArizona
Coordinates32.8282, -111.80257
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 rating64 US tons
Inventory rating38 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans12
Design loadHS 20
Structure length351 ft (107 m)
Longest span30 ft (9.1 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,020 (2023)
Projected traffic3,030 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 WB over Santa Cruz Wash built?

It was built in 1966, making it 59 years old in 2025.

What condition is I-8 WB over Santa Cruz 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 WB over Santa Cruz Wash carry?

About 3,020 vehicles per day (2023 count), of which roughly 19% are trucks.

How long is I-8 WB over Santa Cruz Wash?

The structure is 351 ft (107 m) long with a longest span of 30 ft (9.1 m) and a deck 35 ft wide.

Who owns I-8 WB over Santa Cruz Wash?

It is owned by the State Highway Agency.