US Bridges

Audubon Ave over Lafourche Bayou

FairPosted for load

Lafourche Parish, Louisiana · 00.01 Log Mi. from LA 308 · Structure no. 022929478904821

Built
1986
39 years old
Condition
Fair
inspected June 2023
Type
Slab
Concrete
Length
229 ft
12 main spans
Daily traffic
7,219
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

Audubon Ave over Lafourche Bayou is a concrete slab carrying Audubon Ave over Lafourche Bayou in Lafourche Parish, Louisiana. It was built in 1986, so it is 39 years old, younger 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. Its operating status is: posted for load restriction.

It carries about 7,219 vehicles a day, projected to reach 7,940 by 2041. The structure is 229 ft (69.8 m) long and 38 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesAudubon Ave
CrossesLafourche Bayou
Location00.01 Log Mi. from LA 308
RouteCounty Highway 0
CountyLafourche Parish
StateLouisiana
Coordinates29.79667, -90.8033
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50.7 US tons
Inventory rating39.2 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans12
Design loadHS 20
Structure length229 ft (69.8 m)
Longest span19 ft (5.8 m)
Deck width38 ft (11.6 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,219 (2021)
Projected traffic7,940 by 2041
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was Audubon Ave over Lafourche Bayou built?

It was built in 1986, making it 39 years old in 2025.

What condition is Audubon Ave over Lafourche Bayou 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 June 2023.

How much traffic does Audubon Ave over Lafourche Bayou carry?

About 7,219 vehicles per day (2021 count).

How long is Audubon Ave over Lafourche Bayou?

The structure is 229 ft (69.8 m) long with a longest span of 19 ft (5.8 m) and a deck 38 ft wide.

Who owns Audubon Ave over Lafourche Bayou?

It is owned by the City or Municipal Highway Agency.