US Bridges

39th Avenue over I 10

Fair

Maricopa County, Arizona · 2.0 MI West JCT I 17 · Structure no. 01932

Built
1985
40 years old
Condition
Fair
inspected March 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete Continuous
Length
281 ft
2 main spans
Daily traffic
5,517
2022 count
Owner
State
State Highway Agency

About this bridge

39th Avenue over I 10 is a prestressed concrete continuous box beam or girders - single or spread carrying 39th Avenue over I 10 in Maricopa County, Arizona. It was built in 1985, so it is 40 years old, younger 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 5,517 vehicles a day, roughly 4% of them trucks, projected to reach 5,527 by 2042. The structure is 281 ft (85.6 m) long and 57 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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Carries39th Avenue
CrossesI 10
Location2.0 MI West JCT I 17
RouteCity Street 0
CountyMaricopa County
StateArizona
Coordinates33.4615, -112.1432
Functional classUrban Collector

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 inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67 US tons
Inventory rating39 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length281 ft (85.6 m)
Longest span138 ft (42.1 m)
Deck width57 ft (17.3 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,517 (2022)
Projected traffic5,527 by 2042
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.2 mi (2 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 39th Avenue over I 10 built?

It was built in 1985, making it 40 years old in 2025.

What condition is 39th Avenue 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 March 2023.

How much traffic does 39th Avenue over I 10 carry?

About 5,517 vehicles per day (2022 count), of which roughly 4% are trucks.

How long is 39th Avenue over I 10?

The structure is 281 ft (85.6 m) long with a longest span of 138 ft (42.1 m) and a deck 57 ft wide.

Who owns 39th Avenue over I 10?

It is owned by the State Highway Agency.