US Bridges

LA0056 over ST Louis Canal

Fair

Terrebonne Parish, Louisiana · 5.96 MI South of LA 58 · Structure no. 025502470305961

Built
1969
56 years old
Condition
Fair
inspected April 2023
Type
Slab
Concrete
Length
100 ft
5 main spans
Daily traffic
7,379
2021 count
Owner
State
State Highway Agency

About this bridge

LA0056 over ST Louis Canal is a concrete slab carrying LA0056 over ST Louis Canal in Terrebonne Parish, Louisiana. It was built in 1969, so it is 56 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 7,379 vehicles a day, roughly 11% of them trucks, projected to reach 8,116 by 2041. The structure is 100 ft (30.5 m) long and 50 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

Location

Open in Google Maps
CarriesLA0056
CrossesST Louis Canal
Location5.96 MI South of LA 58
RouteState Highway 56
CountyTerrebonne Parish
StateLouisiana
Coordinates29.54205, -90.6275
Functional classUrban 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating79 US tons
Inventory rating48 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length100 ft (30.5 m)
Longest span20 ft (6.1 m)
Deck width50 ft (15.2 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,379 (2021)
Projected traffic8,116 by 2041
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.2 mi (18 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 LA0056 over ST Louis Canal built?

It was built in 1969, making it 56 years old in 2025.

What condition is LA0056 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 April 2023.

How much traffic does LA0056 over ST Louis Canal carry?

About 7,379 vehicles per day (2021 count), of which roughly 11% are trucks.

How long is LA0056 over ST Louis Canal?

The structure is 100 ft (30.5 m) long with a longest span of 20 ft (6.1 m) and a deck 50 ft wide.

Who owns LA0056 over ST Louis Canal?

It is owned by the State Highway Agency.