US Bridges

I 8; WB over SR B8 & SPRR

Fair

Maricopa County, Arizona · 4.3 MI W JCT B 8 · Structure no. 01556

Built
1971
54 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
659 ft
7 main spans
Daily traffic
1,620
2022 count
Owner
State
State Highway Agency

About this bridge

I 8; WB over SR B8 & SPRR is a steel continuous stringer/multi-beam or girder carrying I 8; WB over SR B8 & SPRR in Maricopa County, Arizona. It was built in 1971, so it is 54 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 1,620 vehicles a day, roughly 26% of them trucks, projected to reach 1,630 by 2042. The structure is 659 ft (200.9 m) long and 41 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI 8; WB
CrossesSR B8 & SPRR
Location4.3 MI W JCT B 8
RouteInterstate 8
CountyMaricopa County
StateArizona
Coordinates32.9424, -112.7415
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65 US tons
Inventory rating39 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length659 ft (200.9 m)
Longest span102 ft (31.1 m)
Deck width41 ft (12.4 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deck25 ft (7.6 m)

Traffic and service

Average daily traffic1,620 (2022)
Projected traffic1,630 by 2042
Trucks26%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and railroad
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 8; WB over SR B8 & SPRR built?

It was built in 1971, making it 54 years old in 2025.

What condition is I 8; WB over SR B8 & SPRR 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 August 2023.

How much traffic does I 8; WB over SR B8 & SPRR carry?

About 1,620 vehicles per day (2022 count), of which roughly 26% are trucks.

How long is I 8; WB over SR B8 & SPRR?

The structure is 659 ft (200.9 m) long with a longest span of 102 ft (31.1 m) and a deck 41 ft wide.

Who owns I 8; WB over SR B8 & SPRR?

It is owned by the State Highway Agency.