US Bridges

LA3127 over Union Carbide Canal

Fair

St. Charles Parish, Louisiana · .6 MI East of LA 3142 · Structure no. 024504280306801

Built
1975
50 years old
Condition
Fair
inspected April 2024
Type
Slab
Concrete
Length
60 ft
3 main spans
Daily traffic
6,703
2021 count
Owner
State
State Highway Agency

About this bridge

LA3127 over Union Carbide Canal is a concrete slab carrying LA3127 over Union Carbide Canal in St. Charles 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 6,703 vehicles a day, roughly 20% of them trucks, projected to reach 7,373 by 2041. The structure is 60 ft (18.3 m) long and 43 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesLA3127
CrossesUnion Carbide Canal
Location.6 MI East of LA 3142
RouteState Highway 3127
CountySt. Charles Parish
StateLouisiana
Coordinates29.96457, -90.451
Functional classRural 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 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52.9 US tons
Inventory rating36.8 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length60 ft (18.3 m)
Longest span20 ft (6.1 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,703 (2021)
Projected traffic7,373 by 2041
Trucks20%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 LA3127 over Union Carbide Canal built?

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

What condition is LA3127 over Union Carbide 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 2024.

How much traffic does LA3127 over Union Carbide Canal carry?

About 6,703 vehicles per day (2021 count), of which roughly 20% are trucks.

How long is LA3127 over Union Carbide Canal?

The structure is 60 ft (18.3 m) long with a longest span of 20 ft (6.1 m) and a deck 43 ft wide.

Who owns LA3127 over Union Carbide Canal?

It is owned by the State Highway Agency.