US Bridges

LA0055 over ST Louis Canal

Fair

Terrebonne Parish, Louisiana · .5 MI South of LA 24 · Structure no. 025502480304841

Built
1953
72 years old
Condition
Fair
inspected March 2023
Type
Slab
Concrete
Length
80 ft
4 main spans
Daily traffic
4,035
2021 count
Owner
State
State Highway Agency

About this bridge

LA0055 over ST Louis Canal is a concrete slab carrying LA0055 over ST Louis Canal in Terrebonne Parish, Louisiana. It was built in 1953, so it is 72 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 4,035 vehicles a day, roughly 13% of them trucks, projected to reach 4,438 by 2041. The structure is 80 ft (24.4 m) long and 29 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesLA0055
CrossesST Louis Canal
Location.5 MI South of LA 24
RouteState Highway 55
CountyTerrebonne Parish
StateLouisiana
Coordinates29.54114, -90.5829
Functional classUrban 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39 US tons
Inventory rating23 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans4
Design loadH 15
Structure length80 ft (24.4 m)
Longest span20 ft (6.1 m)
Deck width29 ft (8.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,035 (2021)
Projected traffic4,438 by 2041
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed8.7 mi (14 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$412,000
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0055 over ST Louis Canal built?

It was built in 1953, making it 72 years old in 2025.

What condition is LA0055 over ST Louis Canal 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 March 2023.

How much traffic does LA0055 over ST Louis Canal carry?

About 4,035 vehicles per day (2021 count), of which roughly 13% are trucks.

How long is LA0055 over ST Louis Canal?

The structure is 80 ft (24.4 m) long with a longest span of 20 ft (6.1 m) and a deck 29 ft wide.

Who owns LA0055 over ST Louis Canal?

It is owned by the State Highway Agency.