US Bridges

LA8406 over Bayou Desiard

Fair

Ouachita Parish, Louisiana · 2.67 MI NE of N 18th ST · Structure no. 053708370402671

Built
1995
30 years old
Condition
Fair
inspected October 2024
Type
Slab
Concrete
Length
440 ft
22 main spans
Daily traffic
15,737
2021 count
Owner
State
State Highway Agency

About this bridge

LA8406 over Bayou Desiard is a concrete slab carrying LA8406 over Bayou Desiard in Ouachita Parish, Louisiana. It was built in 1995, so it is 30 years old, younger 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 15,737 vehicles a day, roughly 9% of them trucks, projected to reach 17,310 by 2041. The structure is 440 ft (134.1 m) long and 63 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesLA8406
CrossesBayou Desiard
Location2.67 MI NE of N 18th ST
RouteState Highway 8406
CountyOuachita Parish
StateLouisiana
Coordinates32.54331, -92.0947
Functional classUrban Other Principal Arterial

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75 US tons
Inventory rating44 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans22
Design loadHS 20
Structure length440 ft (134.1 m)
Longest span20 ft (6.1 m)
Deck width63 ft (19.2 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,737 (2021)
Projected traffic17,310 by 2041
Trucks9%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2.7 million
NavigationNo navigation control on waterway

Frequently asked questions

When was LA8406 over Bayou Desiard built?

It was built in 1995, making it 30 years old in 2025.

What condition is LA8406 over Bayou Desiard 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 October 2024.

How much traffic does LA8406 over Bayou Desiard carry?

About 15,737 vehicles per day (2021 count), of which roughly 9% are trucks.

How long is LA8406 over Bayou Desiard?

The structure is 440 ft (134.1 m) long with a longest span of 20 ft (6.1 m) and a deck 63 ft wide.

Who owns LA8406 over Bayou Desiard?

It is owned by the State Highway Agency.