US Bridges

LA0649 over Bayou Lafourche

Good

Lafourche Parish, Louisiana · .01 MI North of LA 1 · Structure no. 022908291800001

Built
1996
29 years old
Condition
Good
inspected June 2023
Type
Movable - Swing
Steel
Length
167 ft
4 main spans
Daily traffic
1,991
2021 count
Owner
State
State Highway Agency

About this bridge

LA0649 over Bayou Lafourche is a steel movable - swing carrying LA0649 over Bayou Lafourche in Lafourche Parish, Louisiana. It was built in 1996, so it is 29 years old, younger than the Louisiana average of 43 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,991 vehicles a day, roughly 13% of them trucks, projected to reach 2,190 by 2041. The structure is 167 ft (50.9 m) long and 43 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesLA0649
CrossesBayou Lafourche
Location.01 MI North of LA 1
RouteState Highway 649
CountyLafourche Parish
StateLouisiana
Coordinates29.75402, -90.72813
Functional classUrban Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61 US tons
Inventory rating40 US tons

Structure

Structure typeMovable - Swing
MaterialSteel
DeckOpen grating
Main spans4
Design loadHS 20
Structure length167 ft (50.9 m)
Longest span132 ft (40.2 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,991 (2021)
Projected traffic2,190 by 2041
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was LA0649 over Bayou Lafourche built?

It was built in 1996, making it 29 years old in 2025.

What condition is LA0649 over Bayou Lafourche in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2023.

How much traffic does LA0649 over Bayou Lafourche carry?

About 1,991 vehicles per day (2021 count), of which roughly 13% are trucks.

How long is LA0649 over Bayou Lafourche?

The structure is 167 ft (50.9 m) long with a longest span of 132 ft (40.2 m) and a deck 43 ft wide.

Who owns LA0649 over Bayou Lafourche?

It is owned by the State Highway Agency.