US Bridges

LA0024 over St. Louis Bayou

Fair

Lafourche Parish, Louisiana · 10.6 MI West of LA 1 · Structure no. 022900650110631

Built
1975
50 years old
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
78 ft
1 main span
Daily traffic
5,271
2021 count
Owner
State
State Highway Agency

About this bridge

LA0024 over St. Louis Bayou is a steel stringer/multi-beam or girder carrying LA0024 over St. Louis Bayou in Lafourche Parish, Louisiana. It was built in 1975, so it is 50 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 5,271 vehicles a day, roughly 20% of them trucks, projected to reach 5,798 by 2041. The structure is 78 ft (23.8 m) long and 43 ft wide.

Location

Open in Google Maps
CarriesLA0024
CrossesSt. Louis Bayou
Location10.6 MI West of LA 1
RouteState Highway 24
CountyLafourche Parish
StateLouisiana
Coordinates29.55144, -90.5301
Functional classRural Minor Arterial

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating69 US tons
Inventory rating41 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadHS 20
Structure length78 ft (23.8 m)
Longest span38 ft (11.6 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,271 (2021)
Projected traffic5,798 by 2041
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0024 over St. Louis Bayou built?

It was built in 1975, making it 50 years old in 2025.

What condition is LA0024 over St. Louis 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 February 2023.

How much traffic does LA0024 over St. Louis Bayou carry?

About 5,271 vehicles per day (2021 count), of which roughly 20% are trucks.

How long is LA0024 over St. Louis Bayou?

The structure is 78 ft (23.8 m) long with a longest span of 38 ft (11.6 m) and a deck 43 ft wide.

Who owns LA0024 over St. Louis Bayou?

It is owned by the State Highway Agency.