US Bridges

LA3086 over Serpent Bayou

Good

Jefferson Davis Parish, Louisiana · 3.2 MI N of LA 102 · Structure no. 072701980403301

Built
1990
35 years old
Condition
Good
inspected September 2023
Type
Slab
Concrete
Length
160 ft
8 main spans
Daily traffic
369
2021 count
Owner
State
State Highway Agency

About this bridge

LA3086 over Serpent Bayou is a concrete slab carrying LA3086 over Serpent Bayou in Jefferson Davis Parish, Louisiana. It was built in 1990, so it is 35 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 369 vehicles a day, roughly 11% of them trucks, projected to reach 405 by 2041. The structure is 160 ft (48.8 m) long and 31 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesLA3086
CrossesSerpent Bayou
Location3.2 MI N of LA 102
RouteState Highway 3086
Coordinates30.3955, -92.82631
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than 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 rating73 US tons
Inventory rating43 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans8
Design loadHS 20
Structure length160 ft (48.8 m)
Longest span20 ft (6.1 m)
Deck width31 ft (9.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic369 (2021)
Projected traffic405 by 2041
Trucks11%
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 LA3086 over Serpent Bayou built?

It was built in 1990, making it 35 years old in 2025.

What condition is LA3086 over Serpent 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 2023.

How much traffic does LA3086 over Serpent Bayou carry?

About 369 vehicles per day (2021 count), of which roughly 11% are trucks.

How long is LA3086 over Serpent Bayou?

The structure is 160 ft (48.8 m) long with a longest span of 20 ft (6.1 m) and a deck 31 ft wide.

Who owns LA3086 over Serpent Bayou?

It is owned by the State Highway Agency.