US Bridges

LA 124 over Larto Lake Bayou

PoorPosted for load

Catahoula Parish, Louisiana · 27.4 MI S of US 84 · Structure no. 581308132407981

Built
1958
67 years old
Condition
Poor
inspected December 2024
Type
Slab
Concrete
Length
114 ft
6 main spans
Daily traffic
514
2021 count
Owner
State
State Highway Agency

About this bridge

LA 124 over Larto Lake Bayou is a concrete slab carrying LA 124 over Larto Lake Bayou in Catahoula Parish, Louisiana. It was built in 1958, so it is 67 years old, older than the Louisiana average of 43 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 2 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 514 vehicles a day, roughly 15% of them trucks, projected to reach 565 by 2041. The structure is 114 ft (34.7 m) long and 23 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesLA 124
CrossesLarto Lake Bayou
Location27.4 MI S of US 84
RouteState Highway 3102
Coordinates31.33379, -91.9358
Functional classRural Minor Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Superstructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Substructure2 CriticalAdvanced deterioration of primary structural elements. Bridge may be closed until corrective action is taken.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating51 US tons
Inventory rating30 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans6
Design loadH 15
Structure length114 ft (34.7 m)
Longest span19 ft (5.8 m)
Deck width23 ft (7 m)
Roadway width20 ft (6.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic514 (2021)
Projected traffic565 by 2041
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 LA 124 over Larto Lake Bayou built?

It was built in 1958, making it 67 years old in 2025.

What condition is LA 124 over Larto Lake Bayou in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in December 2024.

How much traffic does LA 124 over Larto Lake Bayou carry?

About 514 vehicles per day (2021 count), of which roughly 15% are trucks.

How long is LA 124 over Larto Lake Bayou?

The structure is 114 ft (34.7 m) long with a longest span of 19 ft (5.8 m) and a deck 23 ft wide.

Who owns LA 124 over Larto Lake Bayou?

It is owned by the State Highway Agency.