US Bridges

339th Avenue over I 10

Fair

Maricopa County, Arizona · 9.31 MI West of JCT SR 85 · Structure no. 01644

Built
1974
51 years old
Condition
Fair
inspected May 2023
Type
Box Beam or Girders - Single or Spread
Concrete Continuous
Length
253 ft
2 main spans
Daily traffic
5,000
2023 count
Owner
State
State Highway Agency

About this bridge

339th Avenue over I 10 is a concrete continuous box beam or girders - single or spread carrying 339th Avenue over I 10 in Maricopa County, Arizona. It was built in 1974, so it is 51 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 5,000 vehicles a day, roughly 26% of them trucks, projected to reach 5,010 by 2042. The structure is 253 ft (77.1 m) long and 31 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
Carries339th Avenue
CrossesI 10
Location9.31 MI West of JCT SR 85
RouteCounty Highway 0
CountyMaricopa County
StateArizona
Coordinates33.4623, -112.7816
Functional classRural Major 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating64 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length253 ft (77.1 m)
Longest span125 ft (38.1 m)
Deck width31 ft (9.3 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,000 (2023)
Projected traffic5,010 by 2042
Trucks26%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.7 mi (6 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 339th Avenue over I 10 built?

It was built in 1974, making it 51 years old in 2025.

What condition is 339th 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 May 2023.

How much traffic does 339th Avenue over I 10 carry?

About 5,000 vehicles per day (2023 count), of which roughly 26% are trucks.

How long is 339th Avenue over I 10?

The structure is 253 ft (77.1 m) long with a longest span of 125 ft (38.1 m) and a deck 31 ft wide.

Who owns 339th Avenue over I 10?

It is owned by the State Highway Agency.