US Bridges

LA0406 over Planters Canal

Fair

Plaquemines Parish, Louisiana · 1.71 MI North of LA 23 · Structure no. 023808380301711

Built
1977
48 years old
Condition
Fair
inspected September 2023
Type
Slab
Concrete
Length
80 ft
4 main spans
Daily traffic
12,412
2021 count
Owner
State
State Highway Agency

About this bridge

LA0406 over Planters Canal is a concrete slab carrying LA0406 over Planters Canal in Plaquemines Parish, Louisiana. It was built in 1977, so it is 48 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 12,412 vehicles a day, roughly 11% of them trucks, projected to reach 13,653 by 2041. The structure is 80 ft (24.4 m) long and 42 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

Open in Google Maps
CarriesLA0406
CrossesPlanters Canal
Location1.71 MI North of LA 23
RouteState Highway 406
CountyPlaquemines Parish
StateLouisiana
Coordinates29.88518, -89.9946
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75 US tons
Inventory rating45 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length80 ft (24.4 m)
Longest span20 ft (6.1 m)
Deck width42 ft (12.9 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,412 (2021)
Projected traffic13,653 by 2041
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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 LA0406 over Planters Canal built?

It was built in 1977, making it 48 years old in 2025.

What condition is LA0406 over Planters 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 September 2023.

How much traffic does LA0406 over Planters Canal carry?

About 12,412 vehicles per day (2021 count), of which roughly 11% are trucks.

How long is LA0406 over Planters Canal?

The structure is 80 ft (24.4 m) long with a longest span of 20 ft (6.1 m) and a deck 42 ft wide.

Who owns LA0406 over Planters Canal?

It is owned by the State Highway Agency.