US Bridges

Airport Road over I-12

Fair

St. Tammany Parish, Louisiana · 6.2 M E of LA 434 · Structure no. 625204540427561

Built
1972
53 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
285 ft
4 main spans
Daily traffic
4,450
2015 count
Owner
State
State Highway Agency

About this bridge

Airport Road over I-12 is a prestressed concrete stringer/multi-beam or girder carrying Airport Road over I-12 in St. Tammany Parish, Louisiana. It was built in 1972, so it is 53 years old, older than the Louisiana average of 43 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 4,450 vehicles a day, projected to reach 4,895 by 2035. The structure is 285 ft (86.9 m) long and 43 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesAirport Road
CrossesI-12
Location6.2 M E of LA 434
RouteCounty Highway 0
CountySt. Tammany Parish
StateLouisiana
Coordinates30.31283, -89.8259
Functional classUrban Local

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.
Substructure7 GoodSome minor problems.
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 rating89 US tons
Inventory rating39 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length285 ft (86.9 m)
Longest span95 ft (29 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,450 (2015)
Projected traffic4,895 by 2035
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed98.8 mi (159 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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Airport Road over I-12 built?

It was built in 1972, making it 53 years old in 2025.

What condition is Airport Road over I-12 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 Airport Road over I-12 carry?

About 4,450 vehicles per day (2015 count).

How long is Airport Road over I-12?

The structure is 285 ft (86.9 m) long with a longest span of 95 ft (29 m) and a deck 43 ft wide.

Who owns Airport Road over I-12?

It is owned by the State Highway Agency.