US Bridges

LA0402 over Bayou Lafourche @ Munson

Fair

Assumption Parish, Louisiana · LA0402 · Structure no. 610408041102491

Built
1976
49 years old
Condition
Fair
inspected December 2023
Type
Slab
Concrete
Length
171 ft
9 main spans
Daily traffic
551
2021 count
Owner
State
State Highway Agency

About this bridge

LA0402 over Bayou Lafourche @ Munson is a concrete slab carrying LA0402 over Bayou Lafourche @ Munson in Assumption Parish, Louisiana. It was built in 1976, so it is 49 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 551 vehicles a day, roughly 11% of them trucks, projected to reach 606 by 2041. The structure is 171 ft (52.1 m) long and 35 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesLA0402
CrossesBayou Lafourche @ Munson
LocationLA0402
RouteState Highway 402
CountyAssumption Parish
StateLouisiana
Coordinates29.95542, -91.03045
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.

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
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 rating40.3 US tons
Inventory rating31.4 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans9
Design loadHS 20
Structure length171 ft (52.1 m)
Longest span19 ft (5.8 m)
Deck width35 ft (10.7 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic551 (2021)
Projected traffic606 by 2041
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 LA0402 over Bayou Lafourche @ Munson built?

It was built in 1976, making it 49 years old in 2025.

What condition is LA0402 over Bayou Lafourche @ Munson 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 December 2023.

How much traffic does LA0402 over Bayou Lafourche @ Munson carry?

About 551 vehicles per day (2021 count), of which roughly 11% are trucks.

How long is LA0402 over Bayou Lafourche @ Munson?

The structure is 171 ft (52.1 m) long with a longest span of 19 ft (5.8 m) and a deck 35 ft wide.

Who owns LA0402 over Bayou Lafourche @ Munson?

It is owned by the State Highway Agency.