US Bridges

I-8 WB over Smith Road

Fair

Pinal County, Arizona · 5.9 MI E JCT SR 84 · Structure no. 01069

Built
1962
63 years old
Condition
Fair
inspected February 2024
Type
Slab
Concrete Continuous
Length
90 ft
3 main spans
Daily traffic
2,227
2023 count
Owner
State
State Highway Agency

About this bridge

I-8 WB over Smith Road is a concrete continuous slab carrying I-8 WB over Smith Road in Pinal County, Arizona. It was built in 1962, so it is 63 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 5 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 2,227 vehicles a day, roughly 17% of them trucks, projected to reach 2,237 by 2042. The structure is 90 ft (27.4 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-8 WB
CrossesSmith Road
Location5.9 MI E JCT SR 84
RouteInterstate 8
CountyPinal County
StateArizona
Coordinates32.8309, -112.0325
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41 US tons
Inventory rating24 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length90 ft (27.4 m)
Longest span33 ft (10.1 m)
Deck width43 ft (13.2 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,227 (2023)
Projected traffic2,237 by 2042
Trucks17%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1,000 (2024 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-8 WB over Smith Road built?

It was built in 1962, making it 63 years old in 2025.

What condition is I-8 WB over Smith Road 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 Smith Road carry?

About 2,227 vehicles per day (2023 count), of which roughly 17% are trucks.

How long is I-8 WB over Smith Road?

The structure is 90 ft (27.4 m) long with a longest span of 33 ft (10.1 m) and a deck 43 ft wide.

Who owns I-8 WB over Smith Road?

It is owned by the State Highway Agency.