US Bridges

LA 515 over Four Mile Bayou

Good

Red River Parish, Louisiana · 4.4 MI NW of US 71 · Structure no. 044100000000257

Built
2024
1 years old
Condition
Good
inspected September 2024
Type
Slab
Concrete
Length
60 ft
3 main spans
Daily traffic
468
2023 count
Owner
State
State Highway Agency

About this bridge

LA 515 over Four Mile Bayou is a concrete slab carrying LA 515 over Four Mile Bayou in Red River Parish, Louisiana. It was built in 2024, so it is 1 years old, younger than the Louisiana average of 43 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 468 vehicles a day, roughly 19% of them trucks, projected to reach 514 by 2043. The structure is 60 ft (18.3 m) long and 35 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesLA 515
CrossesFour Mile Bayou
Location4.4 MI NW of US 71
RouteState Highway 515
Coordinates32.14257, -93.4268
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating87.9 US tons
Inventory rating67.9 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadGreater than HL 93
Structure length60 ft (18.3 m)
Longest span20 ft (6.1 m)
Deck width35 ft (10.6 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic468 (2023)
Projected traffic514 by 2043
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 515 over Four Mile Bayou built?

It was built in 2024, making it 1 years old in 2025.

What condition is LA 515 over Four Mile Bayou in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2024.

How much traffic does LA 515 over Four Mile Bayou carry?

About 468 vehicles per day (2023 count), of which roughly 19% are trucks.

How long is LA 515 over Four Mile Bayou?

The structure is 60 ft (18.3 m) long with a longest span of 20 ft (6.1 m) and a deck 35 ft wide.

Who owns LA 515 over Four Mile Bayou?

It is owned by the State Highway Agency.