US Bridges

LA0316 over St.Louis Canal

Fair

Terrebonne Parish, Louisiana · 0.50 North of LA.24 · Structure no. 025504120400561

Built
1996
29 years old
Condition
Fair
inspected August 2024
Type
Slab
Concrete
Length
84 ft
4 main spans
Daily traffic
7,165
2021 count
Owner
State
State Highway Agency

About this bridge

LA0316 over St.Louis Canal is a concrete slab carrying LA0316 over St.Louis Canal in Terrebonne Parish, Louisiana. It was built in 1996, so it is 29 years old, younger 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 7,165 vehicles a day, roughly 13% of them trucks, projected to reach 7,881 by 2041. The structure is 84 ft (25.6 m) long and 43 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesLA0316
CrossesSt.Louis Canal
Location0.50 North of LA.24
RouteState Highway 316
CountyTerrebonne Parish
StateLouisiana
Coordinates29.70075, -90.7792
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 protection7 GoodSome minor problems.
Last inspectionAugust 2024
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating79 US tons
Inventory rating47 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length84 ft (25.6 m)
Longest span24 ft (7.3 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,165 (2021)
Projected traffic7,881 by 2041
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRelief for waterway
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 statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was LA0316 over St.Louis Canal built?

It was built in 1996, making it 29 years old in 2025.

What condition is LA0316 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 August 2024.

How much traffic does LA0316 over St.Louis Canal carry?

About 7,165 vehicles per day (2021 count), of which roughly 13% are trucks.

How long is LA0316 over St.Louis Canal?

The structure is 84 ft (25.6 m) long with a longest span of 24 ft (7.3 m) and a deck 43 ft wide.

Who owns LA0316 over St.Louis Canal?

It is owned by the State Highway Agency.