US Bridges

LA0078 over Port Allen Lock

Fair

Pointe Coupee Parish, Louisiana · 256 Ft S of LA 979 · Structure no. 613902290503021

Built
1980
45 years old
Condition
Fair
inspected February 2023
Type
Slab
Concrete
Length
240 ft
12 main spans
Daily traffic
4,464
2023 count
Owner
State
State Highway Agency

About this bridge

LA0078 over Port Allen Lock is a concrete slab carrying LA0078 over Port Allen Lock in Pointe Coupee Parish, Louisiana. It was built in 1980, so it is 45 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 4,464 vehicles a day, roughly 10% of them trucks, projected to reach 4,910 by 2043. The structure is 240 ft (73.2 m) long and 43 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesLA0078
CrossesPort Allen Lock
Location256 Ft S of LA 979
RouteState Highway 78
CountyPointe Coupee Parish
StateLouisiana
Coordinates30.58516, -91.52539
Functional classRural Major 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating42.1 US tons
Inventory rating32.5 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans12
Design loadHS 20
Structure length240 ft (73.2 m)
Longest span20 ft (6.1 m)
Deck width43 ft (13 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,464 (2023)
Projected traffic4,910 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-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 LA0078 over Port Allen Lock built?

It was built in 1980, making it 45 years old in 2025.

What condition is LA0078 over Port Allen Lock 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 February 2023.

How much traffic does LA0078 over Port Allen Lock carry?

About 4,464 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is LA0078 over Port Allen Lock?

The structure is 240 ft (73.2 m) long with a longest span of 20 ft (6.1 m) and a deck 43 ft wide.

Who owns LA0078 over Port Allen Lock?

It is owned by the State Highway Agency.