US Bridges

LA0178 over Bayou

Fair

Acadia Parish, Louisiana · 1.3 MI NE of LA 95 · Structure no. 030102080101441

Built
1975
50 years old
Condition
Fair
inspected December 2023
Type
Slab
Concrete
Length
60 ft
3 main spans
Daily traffic
3,177
2021 count
Owner
State
State Highway Agency

About this bridge

LA0178 over Bayou is a concrete slab carrying LA0178 over Bayou in Acadia 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 3,177 vehicles a day, roughly 13% of them trucks, projected to reach 3,494 by 2041. The structure is 60 ft (18.3 m) long and 42 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesLA0178
CrossesBayou
Location1.3 MI NE of LA 95
RouteState Highway 178
CountyAcadia Parish
StateLouisiana
Coordinates30.41608, -92.1989
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.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating80 US tons
Inventory rating48 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length60 ft (18.3 m)
Longest span20 ft (6.1 m)
Deck width42 ft (12.9 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,177 (2021)
Projected traffic3,494 by 2041
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0178 over Bayou built?

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

What condition is LA0178 over 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 December 2023.

How much traffic does LA0178 over Bayou carry?

About 3,177 vehicles per day (2021 count), of which roughly 13% are trucks.

How long is LA0178 over Bayou?

The structure is 60 ft (18.3 m) long with a longest span of 20 ft (6.1 m) and a deck 42 ft wide.

Who owns LA0178 over Bayou?

It is owned by the State Highway Agency.