US Bridges

LA0399 over Little 6 Mile CR

PoorPosted for load

Vernon Parish, Louisiana · .5 MI North of LA 10 · Structure no. 085801380300501

Built
1965
60 years old
Condition
Poor
inspected March 2024
Type
Slab
Concrete
Length
134 ft
7 main spans
Daily traffic
396
2021 count
Owner
State
State Highway Agency

About this bridge

LA0399 over Little 6 Mile CR is a concrete slab carrying LA0399 over Little 6 Mile CR in Vernon Parish, Louisiana. It was built in 1965, so it is 60 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 3 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 396 vehicles a day, roughly 10% of them trucks, projected to reach 435 by 2041. The structure is 134 ft (40.8 m) long and 32 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

CarriesLA0399
CrossesLittle 6 Mile CR
Location.5 MI North of LA 10
RouteState Highway 399
Coordinates30.96954, -93.0134
Functional classRural Local

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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating19.6 US tons
Inventory rating15 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans7
Design loadHS 20
Structure length134 ft (40.8 m)
Longest span19 ft (5.8 m)
Deck width32 ft (9.8 m)
Roadway width29 ft (8.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic396 (2021)
Projected traffic435 by 2041
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$639,000
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0399 over Little 6 Mile CR built?

It was built in 1965, making it 60 years old in 2025.

What condition is LA0399 over Little 6 Mile CR 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 March 2024.

How much traffic does LA0399 over Little 6 Mile CR carry?

About 396 vehicles per day (2021 count), of which roughly 10% are trucks.

How long is LA0399 over Little 6 Mile CR?

The structure is 134 ft (40.8 m) long with a longest span of 19 ft (5.8 m) and a deck 32 ft wide.

Who owns LA0399 over Little 6 Mile CR?

It is owned by the State Highway Agency.