US Bridges

LA0934 over Black Bayou

PoorPosted for load

Ascension Parish, Louisiana · 0.6 Mi. E of LA 44 · Structure no. 610308031200611

Built
1971
54 years old
Condition
Poor
inspected January 2024
Type
Slab
Concrete
Length
59 ft
3 main spans
Daily traffic
5,367
2021 count
Owner
State
State Highway Agency

About this bridge

LA0934 over Black Bayou is a concrete slab carrying LA0934 over Black Bayou in Ascension Parish, Louisiana. It was built in 1971, so it is 54 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 5,367 vehicles a day, roughly 11% of them trucks, projected to reach 5,903 by 2041. The structure is 59 ft (18 m) long and 31 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesLA0934
CrossesBlack Bayou
Location0.6 Mi. E of LA 44
RouteState Highway 934
Coordinates30.26207, -90.91059
Functional classUrban Collector

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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJanuary 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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating25.7 US tons
Inventory rating17.9 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length59 ft (18 m)
Longest span19 ft (5.8 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,367 (2021)
Projected traffic5,903 by 2041
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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$319,000
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0934 over Black Bayou built?

It was built in 1971, making it 54 years old in 2025.

What condition is LA0934 over Black Bayou 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 January 2024.

How much traffic does LA0934 over Black Bayou carry?

About 5,367 vehicles per day (2021 count), of which roughly 11% are trucks.

How long is LA0934 over Black Bayou?

The structure is 59 ft (18 m) long with a longest span of 19 ft (5.8 m) and a deck 31 ft wide.

Who owns LA0934 over Black Bayou?

It is owned by the State Highway Agency.