US Bridges

LA0155 over Black Lake Bayou Relief

Good

Red River Parish, Louisiana · 11.4 MI E. of US 71 · Structure no. 044100000040321

Built
2015
10 years old
Condition
Good
inspected June 2023
Type
Slab
Concrete
Length
340 ft
17 main spans
Daily traffic
618
2021 count
Owner
State
State Highway Agency

About this bridge

LA0155 over Black Lake Bayou Relief is a concrete slab carrying LA0155 over Black Lake Bayou Relief in Red River Parish, Louisiana. It was built in 2015, so it is 10 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 618 vehicles a day, roughly 19% of them trucks, projected to reach 679 by 2041. The structure is 340 ft (103.6 m) long and 33 ft wide. If it were closed, the detour would be 44.1 mi (71 km).

CarriesLA0155
CrossesBlack Lake Bayou Relief
Location11.4 MI E. of US 71
RouteState Highway 155
Coordinates32.0944, -93.1657
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 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 rating66 US tons
Inventory rating51 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans17
Design loadHL 93
Structure length340 ft (103.6 m)
Longest span20 ft (6.1 m)
Deck width33 ft (10.1 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic618 (2021)
Projected traffic679 by 2041
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed44.1 mi (71 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0155 over Black Lake Bayou Relief built?

It was built in 2015, making it 10 years old in 2025.

What condition is LA0155 over Black Lake Bayou Relief 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 June 2023.

How much traffic does LA0155 over Black Lake Bayou Relief carry?

About 618 vehicles per day (2021 count), of which roughly 19% are trucks.

How long is LA0155 over Black Lake Bayou Relief?

The structure is 340 ft (103.6 m) long with a longest span of 20 ft (6.1 m) and a deck 33 ft wide.

Who owns LA0155 over Black Lake Bayou Relief?

It is owned by the State Highway Agency.