US Bridges

I 8; WB over I 10

Fair

Pinal County, Arizona · At JCT of I 10 · Structure no. 01102

Built
1966
59 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
286 ft
4 main spans
Daily traffic
3,152
2022 count
Owner
State
State Highway Agency

About this bridge

I 8; WB over I 10 is a steel continuous stringer/multi-beam or girder carrying I 8; WB over I 10 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 3,152 vehicles a day, roughly 19% of them trucks, projected to reach 3,162 by 2042. The structure is 286 ft (87.2 m) long and 35 ft wide.

Location

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CarriesI 8; WB
CrossesI 10
LocationAt JCT of I 10
RouteInterstate 8
CountyPinal County
StateArizona
Coordinates32.8194, -111.6839
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating67 US tons
Inventory rating40 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length286 ft (87.2 m)
Longest span91 ft (27.7 m)
Deck width35 ft (10.7 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,152 (2022)
Projected traffic3,162 by 2042
Trucks19%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate 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$2,000 (2023 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 8; WB over I 10 built?

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

What condition is I 8; WB over I 10 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 October 2023.

How much traffic does I 8; WB over I 10 carry?

About 3,152 vehicles per day (2022 count), of which roughly 19% are trucks.

How long is I 8; WB over I 10?

The structure is 286 ft (87.2 m) long with a longest span of 91 ft (27.7 m) and a deck 35 ft wide.

Who owns I 8; WB over I 10?

It is owned by the State Highway Agency.