US Bridges

LA0378-S over Indian Bayou

Good

Calcasieu Parish, Louisiana · 0.2 MI N of LA 378 · Structure no. 071000000070023

Built
2019
6 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
675 ft
9 main spans
Daily traffic
4,182
2021 count
Owner
State
State Highway Agency

About this bridge

LA0378-S over Indian Bayou is a prestressed concrete stringer/multi-beam or girder carrying LA0378-S over Indian Bayou in Calcasieu Parish, Louisiana. It was built in 2019, so it is 6 years old, younger than the Louisiana average of 43 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 4,182 vehicles a day, roughly 13% of them trucks, projected to reach 4,600 by 2041. The structure is 675 ft (205.7 m) long and 43 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesLA0378-S
CrossesIndian Bayou
Location0.2 MI N of LA 378
RouteState Highway 378
CountyCalcasieu Parish
StateLouisiana
Coordinates30.30274, -93.24707
Functional classUrban Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than 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 alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating60.4 US tons
Inventory rating49.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans9
Design loadGreater than HL 93
Structure length675 ft (205.7 m)
Longest span75 ft (22.9 m)
Deck width43 ft (13 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,182 (2021)
Projected traffic4,600 by 2041
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 LA0378-S over Indian Bayou built?

It was built in 2019, making it 6 years old in 2025.

What condition is LA0378-S over Indian Bayou in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2023.

How much traffic does LA0378-S over Indian Bayou carry?

About 4,182 vehicles per day (2021 count), of which roughly 13% are trucks.

How long is LA0378-S over Indian Bayou?

The structure is 675 ft (205.7 m) long with a longest span of 75 ft (22.9 m) and a deck 43 ft wide.

Who owns LA0378-S over Indian Bayou?

It is owned by the State Highway Agency.