US Bridges

LA0398 over Bayou Morgan City

Fair

Assumption Parish, Louisiana · LA0398 · Structure no. 610408041508611

Built
1969
56 years old
Condition
Fair
inspected February 2023
Type
Slab
Concrete
Length
140 ft
7 main spans
Daily traffic
2,115
2021 count
Owner
State
State Highway Agency

About this bridge

LA0398 over Bayou Morgan City is a concrete slab carrying LA0398 over Bayou Morgan City in Assumption Parish, Louisiana. It was built in 1969, so it is 56 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 2,115 vehicles a day, roughly 10% of them trucks, projected to reach 2,326 by 2041. The structure is 140 ft (42.7 m) long and 34 ft wide. If it were closed, the detour would be 24.9 mi (40 km).

Location

Open in Google Maps
CarriesLA0398
CrossesBayou Morgan City
LocationLA0398
RouteState Highway 398
CountyAssumption Parish
StateLouisiana
Coordinates29.74146, -91.03849
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 protection7 GoodSome minor problems.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 rating79 US tons
Inventory rating48 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length140 ft (42.7 m)
Longest span20 ft (6.1 m)
Deck width34 ft (10.4 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,115 (2021)
Projected traffic2,326 by 2041
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.9 mi (40 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 LA0398 over Bayou Morgan City built?

It was built in 1969, making it 56 years old in 2025.

What condition is LA0398 over Bayou Morgan City 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 February 2023.

How much traffic does LA0398 over Bayou Morgan City carry?

About 2,115 vehicles per day (2021 count), of which roughly 10% are trucks.

How long is LA0398 over Bayou Morgan City?

The structure is 140 ft (42.7 m) long with a longest span of 20 ft (6.1 m) and a deck 34 ft wide.

Who owns LA0398 over Bayou Morgan City?

It is owned by the State Highway Agency.