US Bridges

LA0154 over Flat River

Fair

Bossier Parish, Louisiana · .37 MI East of US 71 · Structure no. 040800900100371

Built
1978
47 years old
Condition
Fair
inspected November 2023
Type
Slab
Concrete
Length
192 ft
10 main spans
Daily traffic
3,124
2021 count
Owner
State
State Highway Agency

About this bridge

LA0154 over Flat River is a concrete slab carrying LA0154 over Flat River in Bossier Parish, Louisiana. It was built in 1978, so it is 47 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 5 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 3,124 vehicles a day, roughly 19% of them trucks, projected to reach 3,436 by 2041. The structure is 192 ft (58.5 m) long and 31 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesLA0154
CrossesFlat River
Location.37 MI East of US 71
RouteState Highway 154
CountyBossier Parish
StateLouisiana
Coordinates32.35321, -93.5506
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
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating31.7 US tons
Inventory rating24.7 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans10
Design loadHS 20
Structure length192 ft (58.5 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 traffic3,124 (2021)
Projected traffic3,436 by 2041
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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$865,000
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0154 over Flat River built?

It was built in 1978, making it 47 years old in 2025.

What condition is LA0154 over Flat River 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 November 2023.

How much traffic does LA0154 over Flat River carry?

About 3,124 vehicles per day (2021 count), of which roughly 19% are trucks.

How long is LA0154 over Flat River?

The structure is 192 ft (58.5 m) long with a longest span of 19 ft (5.8 m) and a deck 31 ft wide.

Who owns LA0154 over Flat River?

It is owned by the State Highway Agency.