US Bridges

LA3125 over Bayou Des Acadiens

Fair

St. James Parish, Louisiana · LA 3125 ST James Par · Structure no. 614704263106901

Built
1980
45 years old
Condition
Fair
inspected June 2024
Type
Slab
Concrete
Length
100 ft
5 main spans
Daily traffic
10,807
2021 count
Owner
State
State Highway Agency

About this bridge

LA3125 over Bayou Des Acadiens is a concrete slab carrying LA3125 over Bayou Des Acadiens in St. James 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 10,807 vehicles a day, roughly 10% of them trucks, projected to reach 11,887 by 2041. The structure is 100 ft (30.5 m) long and 47 ft wide. If it were closed, the detour would be 34.8 mi (56 km).

CarriesLA3125
CrossesBayou Des Acadiens
LocationLA 3125 ST James Par
RouteState Highway 3125
Coordinates30.04518, -90.78819
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 protection8 Very GoodNo problems noted.
Last inspectionJune 2024
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 rating37.8 US tons
Inventory rating31.7 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 width47 ft (14.3 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,807 (2021)
Projected traffic11,887 by 2041
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed34.8 mi (56 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 LA3125 over Bayou Des Acadiens built?

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

What condition is LA3125 over Bayou Des Acadiens 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 June 2024.

How much traffic does LA3125 over Bayou Des Acadiens carry?

About 10,807 vehicles per day (2021 count), of which roughly 10% are trucks.

How long is LA3125 over Bayou Des Acadiens?

The structure is 100 ft (30.5 m) long with a longest span of 20 ft (6.1 m) and a deck 47 ft wide.

Who owns LA3125 over Bayou Des Acadiens?

It is owned by the State Highway Agency.