US Bridges

LA0154 over Four Mile Bayou Relief

Fair

Bienville Parish, Louisiana · 1.54 MI East of LA 4 · Structure no. 040700900401541

Built
1948
77 years old
Condition
Fair
inspected April 2024
Type
Tee Beam
Concrete
Length
98 ft
4 main spans
Daily traffic
856
2021 count
Owner
State
State Highway Agency

About this bridge

LA0154 over Four Mile Bayou Relief is a concrete tee beam carrying LA0154 over Four Mile Bayou Relief in Bienville Parish, Louisiana. It was built in 1948, so it is 77 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 856 vehicles a day, roughly 19% of them trucks, projected to reach 941 by 2041. The structure is 98 ft (29.9 m) long and 29 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

CarriesLA0154
CrossesFour Mile Bayou Relief
Location1.54 MI East of LA 4
RouteState Highway 154
Coordinates32.338, -93.2457
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 protection8 Very GoodNo problems noted.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53 US tons
Inventory rating32 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans4
Design loadH 15
Structure length98 ft (29.9 m)
Longest span24 ft (7.3 m)
Deck width29 ft (8.8 m)
Roadway width24 ft (7.3 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
CrossesRelief for waterway
Detour if closed8.7 mi (14 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 Four Mile Bayou Relief built?

It was built in 1948, making it 77 years old in 2025.

What condition is LA0154 over Four Mile Bayou Relief 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 2024.

How much traffic does LA0154 over Four Mile Bayou Relief carry?

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

How long is LA0154 over Four Mile Bayou Relief?

The structure is 98 ft (29.9 m) long with a longest span of 24 ft (7.3 m) and a deck 29 ft wide.

Who owns LA0154 over Four Mile Bayou Relief?

It is owned by the State Highway Agency.