US Bridges

LA0378 over Bayou

Fair

Calcasieu Parish, Louisiana · .3 MI North of LA 379 · Structure no. 071008101200301

Built
1975
50 years old
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
64 ft
1 main span
Daily traffic
25,890
2021 count
Owner
State
State Highway Agency

About this bridge

LA0378 over Bayou is a prestressed concrete stringer/multi-beam or girder carrying LA0378 over Bayou in Calcasieu 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 25,890 vehicles a day, roughly 17% of them trucks, projected to reach 28,479 by 2041. The structure is 64 ft (19.5 m) long and 72 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesLA0378
CrossesBayou
Location.3 MI North of LA 379
RouteState Highway 378
Coordinates30.24098, -93.25775
Functional classUrban Other Principal 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.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating75.9 US tons
Inventory rating36 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length64 ft (19.5 m)
Longest span64 ft (19.5 m)
Deck width72 ft (22 m)
Roadway width68 ft (20.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25,890 (2021)
Projected traffic28,479 by 2041
Trucks17%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0378 over Bayou built?

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

What condition is LA0378 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 LA0378 over Bayou carry?

About 25,890 vehicles per day (2021 count), of which roughly 17% are trucks.

How long is LA0378 over Bayou?

The structure is 64 ft (19.5 m) long with a longest span of 64 ft (19.5 m) and a deck 72 ft wide.

Who owns LA0378 over Bayou?

It is owned by the State Highway Agency.