US Bridges

LA0790 over Grand Bayou

Fair

Bienville Parish, Louisiana · 0.5 MI West of US 371 · Structure no. 040708070103521

Built
1983
42 years old
Condition
Fair
inspected May 2023
Type
Slab
Concrete
Length
95 ft
5 main spans
Daily traffic
50
2021 count
Owner
State
State Highway Agency

About this bridge

LA0790 over Grand Bayou is a concrete slab carrying LA0790 over Grand Bayou in Bienville Parish, Louisiana. It was built in 1983, so it is 42 years old, younger 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 50 vehicles a day, roughly 20% of them trucks, projected to reach 55 by 2041. The structure is 95 ft (29 m) long and 35 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesLA0790
CrossesGrand Bayou
Location0.5 MI West of US 371
RouteState Highway 790
Coordinates32.2714, -93.2837
Functional classRural Local

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 protection7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating72 US tons
Inventory rating43 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans5
Design loadHS 20
Structure length95 ft (29 m)
Longest span19 ft (5.8 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2021)
Projected traffic55 by 2041
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 LA0790 over Grand Bayou built?

It was built in 1983, making it 42 years old in 2025.

What condition is LA0790 over Grand 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 May 2023.

How much traffic does LA0790 over Grand Bayou carry?

About 50 vehicles per day (2021 count), of which roughly 20% are trucks.

How long is LA0790 over Grand Bayou?

The structure is 95 ft (29 m) long with a longest span of 19 ft (5.8 m) and a deck 35 ft wide.

Who owns LA0790 over Grand Bayou?

It is owned by the State Highway Agency.