US Bridges

SR B 8 over I-8

Fair

Maricopa County, Arizona · 3.8 MI E JCT SR 85 · Structure no. 01345

Built
1969
56 years old
Condition
Fair
inspected January 2025
Type
Box Beam or Girders - Single or Spread
Concrete Continuous
Length
280 ft
2 main spans
Daily traffic
4,296
2022 count
Owner
State
State Highway Agency

About this bridge

SR B 8 over I-8 is a concrete continuous box beam or girders - single or spread carrying SR B 8 over I-8 in Maricopa County, Arizona. It was built in 1969, so it is 56 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 4,296 vehicles a day, roughly 56% of them trucks, projected to reach 4,306 by 2042. The structure is 280 ft (85.3 m) long and 43 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesSR B 8
CrossesI-8
Location3.8 MI E JCT SR 85
RouteState Highway 8
CountyMaricopa County
StateArizona
Coordinates32.92569, -112.67141
Functional classRural Principal Arterial - Other

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 inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating81 US tons
Inventory rating49.1 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length280 ft (85.3 m)
Longest span137 ft (41.8 m)
Deck width43 ft (13 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,296 (2022)
Projected traffic4,306 by 2042
Trucks56%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

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 SR B 8 over I-8 built?

It was built in 1969, making it 56 years old in 2025.

What condition is SR B 8 over I-8 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 January 2025.

How much traffic does SR B 8 over I-8 carry?

About 4,296 vehicles per day (2022 count), of which roughly 56% are trucks.

How long is SR B 8 over I-8?

The structure is 280 ft (85.3 m) long with a longest span of 137 ft (41.8 m) and a deck 43 ft wide.

Who owns SR B 8 over I-8?

It is owned by the State Highway Agency.