US Bridges

LA3008 over Black Bayou

Poor

Webster Parish, Louisiana · 1.4 MI South of LA 160 · Structure no. 046002880206911

Built
1974
51 years old
Condition
Poor
inspected September 2024
Type
Slab
Concrete
Length
210 ft
11 main spans
Daily traffic
145
2021 count
Owner
State
State Highway Agency

About this bridge

LA3008 over Black Bayou is a concrete slab carrying LA3008 over Black Bayou in Webster Parish, Louisiana. It was built in 1974, so it is 51 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.

It carries about 145 vehicles a day, roughly 20% of them trucks, projected to reach 159 by 2041. The structure is 210 ft (64 m) long and 31 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

CarriesLA3008
CrossesBlack Bayou
Location1.4 MI South of LA 160
RouteState Highway 3008
Coordinates32.84646, -93.3231
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, 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 inspectionSeptember 2024
Inspection intervalevery 12 months
Operating statusOpen, no 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 adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating37.8 US tons
Inventory rating27.4 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans11
Design loadHS 20
Structure length210 ft (64 m)
Longest span19 ft (5.8 m)
Deck width31 ft (9.4 m)
Roadway width29 ft (8.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic145 (2021)
Projected traffic159 by 2041
Trucks20%
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$936,000
NavigationNo navigation control on waterway

Frequently asked questions

When was LA3008 over Black Bayou built?

It was built in 1974, making it 51 years old in 2025.

What condition is LA3008 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 September 2024.

How much traffic does LA3008 over Black Bayou carry?

About 145 vehicles per day (2021 count), of which roughly 20% are trucks.

How long is LA3008 over Black Bayou?

The structure is 210 ft (64 m) long with a longest span of 19 ft (5.8 m) and a deck 31 ft wide.

Who owns LA3008 over Black Bayou?

It is owned by the State Highway Agency.