US Bridges

LA0154 over Black Lake Slough

Good

Bienville Parish, Louisiana · 3.5 MI East of LA 792 · Structure no. 040700900407201

Built
1979
46 years old
Condition
Good
inspected May 2023
Type
Slab
Concrete Continuous
Length
300 ft
15 main spans
Daily traffic
856
2021 count
Owner
State
State Highway Agency

About this bridge

LA0154 over Black Lake Slough is a concrete continuous slab carrying LA0154 over Black Lake Slough in Bienville Parish, Louisiana. It was built in 1979, so it is 46 years old, older 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 856 vehicles a day, roughly 19% of them trucks, projected to reach 941 by 2041. The structure is 300 ft (91.4 m) long and 33 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

CarriesLA0154
CrossesBlack Lake Slough
Location3.5 MI East of LA 792
RouteState Highway 154
Coordinates32.36016, -93.1641
Functional classRural Major Collector

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 protection8 Very GoodNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67 US tons
Inventory rating40 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans15
Design loadHS 20
Structure length300 ft (91.4 m)
Longest span20 ft (6.1 m)
Deck width33 ft (10 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic856 (2021)
Projected traffic941 by 2041
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 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 LA0154 over Black Lake Slough built?

It was built in 1979, making it 46 years old in 2025.

What condition is LA0154 over Black Lake Slough 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 May 2023.

How much traffic does LA0154 over Black Lake Slough carry?

About 856 vehicles per day (2021 count), of which roughly 19% are trucks.

How long is LA0154 over Black Lake Slough?

The structure is 300 ft (91.4 m) long with a longest span of 20 ft (6.1 m) and a deck 33 ft wide.

Who owns LA0154 over Black Lake Slough?

It is owned by the State Highway Agency.