US Bridges

LA0507 over Black Lake Bayou

Fair

Bienville Parish, Louisiana · 4.56 MI West of LA 153 · Structure no. 040701000300001

Built
1980
45 years old
Condition
Fair
inspected April 2023
Type
Slab
Concrete
Length
421 ft
22 main spans
Daily traffic
582
2021 count
Owner
State
State Highway Agency

About this bridge

LA0507 over Black Lake Bayou is a concrete slab carrying LA0507 over Black Lake Bayou in Bienville Parish, Louisiana. It was built in 1980, so it is 45 years old, older 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 582 vehicles a day, roughly 19% of them trucks, projected to reach 640 by 2041. The structure is 421 ft (128.3 m) long and 35 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesLA0507
CrossesBlack Lake Bayou
Location4.56 MI West of LA 153
RouteState Highway 507
CountyBienville Parish
StateLouisiana
Coordinates32.20429, -93.21419
Functional classRural Major Collector

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating38.6 US tons
Inventory rating29.7 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans22
Design loadHS 20
Structure length421 ft (128.3 m)
Longest span19 ft (5.8 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic582 (2021)
Projected traffic640 by 2041
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 LA0507 over Black Lake Bayou built?

It was built in 1980, making it 45 years old in 2025.

What condition is LA0507 over Black Lake Bayou 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 April 2023.

How much traffic does LA0507 over Black Lake Bayou carry?

About 582 vehicles per day (2021 count), of which roughly 19% are trucks.

How long is LA0507 over Black Lake Bayou?

The structure is 421 ft (128.3 m) long with a longest span of 19 ft (5.8 m) and a deck 35 ft wide.

Who owns LA0507 over Black Lake Bayou?

It is owned by the State Highway Agency.