US Bridges

I-8 WB over Santa Rosa Wash

Fair

Pinal County, Arizona · 11.3 MI E JCT SR 84 · Structure no. 01093

Built
1965
60 years old
Condition
Fair
inspected February 2024
Type
Slab
Concrete Continuous
Length
620 ft
18 main spans
Daily traffic
3,711
2023 count
Owner
State
State Highway Agency

About this bridge

I-8 WB over Santa Rosa Wash is a concrete continuous slab carrying I-8 WB 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 3,711 vehicles a day, roughly 19% of them trucks, projected to reach 3,721 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

Open in Google Maps
CarriesI-8 WB
CrossesSanta Rosa Wash
Location11.3 MI E JCT SR 84
RouteInterstate 8
CountyPinal County
StateArizona
Coordinates32.82837, -111.93821
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural 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 traffic3,711 (2023)
Projected traffic3,721 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 Rosa Wash built?

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

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

About 3,711 vehicles per day (2023 count), of which roughly 19% are trucks.

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

It is owned by the State Highway Agency.