LA0998 over Bayou Lafourche

Fair

Assumption Parish, Louisiana · LA0998 · Structure no. 610408043600021

Built: 1972; 53 years old
Condition: Fair; inspected June 2024
Type: Slab; Concrete
Length: 169 ft; 10 main spans
Daily traffic: 877; 2021 count
Owner: State; State Highway Agency

About this bridge

LA0998 over Bayou Lafourche is a concrete slab carrying LA0998 over Bayou Lafourche in Assumption Parish, Louisiana. It was built in 1972, so it is 53 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 877 vehicles a day, roughly 11% of them trucks, projected to reach 964 by 2041. The structure is 169 ft (51.5 m) long and 35 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesLA0998

CrossesBayou Lafourche

LocationLA0998

RouteState Highway 998

CountyAssumption Parish

StateLouisiana

Coordinates30.05011, -91.04101

Functional classUrban Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

Component	Rating	Meaning
Deck	6 Satisfactory	Structural elements show some minor deterioration.
Superstructure	6 Satisfactory	Structural elements show some minor deterioration.
Substructure	6 Satisfactory	Structural elements show some minor deterioration.
Channel and channel protection	6 Satisfactory	Structural elements show some minor deterioration.

Last inspectionJune 2024

Inspection intervalevery 24 months

Operating statusOpen, no restriction

ScourFoundations stable; scour above top of footing

Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is

Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is

Waterway adequacy8: Equal to present desirable criteria

Approach roadway alignment8: Equal to present desirable criteria

Operating rating32.2 US tons

Inventory rating24.7 US tons

Structure

Structure typeSlab

MaterialConcrete

DeckConcrete, precast panels

Main spans10

Design loadHS 20

Structure length169 ft (51.5 m)

Longest span17 ft (5.2 m)

Deck width35 ft (10.7 m)

Roadway width28 ft (8.5 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic877 (2021)

Projected traffic964 by 2041

Trucks11%

Lanes on structure2

Traffic directionTwo-way traffic

CarriesHighway

CrossesWaterway

Detour if closed3.7 mi (6 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 LA0998 over Bayou Lafourche built?

It was built in 1972, making it 53 years old in 2025.

What condition is LA0998 over Bayou Lafourche 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 June 2024.

How much traffic does LA0998 over Bayou Lafourche carry?

About 877 vehicles per day (2021 count), of which roughly 11% are trucks.

How long is LA0998 over Bayou Lafourche?

The structure is 169 ft (51.5 m) long with a longest span of 17 ft (5.2 m) and a deck 35 ft wide.

Who owns LA0998 over Bayou Lafourche?

It is owned by the State Highway Agency.