US Bridges

IRR SR 387 over I-10

Fair

Pinal County, Arizona · 9.5 MI SE JCT SR 587 · Structure no. 01151

Built
1967
58 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
287 ft
4 main spans
Daily traffic
19,440
2022 count
Owner
State
State Highway Agency

About this bridge

IRR SR 387 over I-10 is a steel continuous stringer/multi-beam or girder carrying IRR SR 387 over I-10 in Pinal County, Arizona. It was built in 1967, so it is 58 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 19,440 vehicles a day, roughly 10% of them trucks, projected to reach 19,450 by 2042. The structure is 287 ft (87.5 m) long and 35 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

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CarriesIRR SR 387
CrossesI-10
Location9.5 MI SE JCT SR 587
RouteState Highway 387
CountyPinal County
StateArizona
Coordinates33.0027, -111.7532
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 inspectionAugust 2024
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 alignment7: Better than 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 length287 ft (87.5 m)
Longest span90 ft (27.4 m)
Deck width35 ft (10.7 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,440 (2022)
Projected traffic19,450 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemYes

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 (2024 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was IRR SR 387 over I-10 built?

It was built in 1967, making it 58 years old in 2025.

What condition is IRR SR 387 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 August 2024.

How much traffic does IRR SR 387 over I-10 carry?

About 19,440 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is IRR SR 387 over I-10?

The structure is 287 ft (87.5 m) long with a longest span of 90 ft (27.4 m) and a deck 35 ft wide.

Who owns IRR SR 387 over I-10?

It is owned by the State Highway Agency.