US Bridges

T-Bois Bridge RD over Bayou Lafourche

Good

Lafourche Parish, Louisiana · 0.01 N. of LA 1 · Structure no. 022929576903991

Built
2007
18 years old
Condition
Good
inspected July 2023
Type
Movable - Lift
Steel
Length
279 ft
1 main span
Daily traffic
1,928
2020 count
Owner
County
County Highway Agency

About this bridge

T-Bois Bridge RD over Bayou Lafourche is a steel movable - lift carrying T-Bois Bridge RD over Bayou Lafourche in Lafourche Parish, Louisiana. It was built in 2007, so it is 18 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 1,928 vehicles a day, projected to reach 2,120 by 2040. The structure is 279 ft (85 m) long and 88 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesT-Bois Bridge RD
CrossesBayou Lafourche
Location0.01 N. of LA 1
RouteCounty Highway 0
CountyLafourche Parish
StateLouisiana
Coordinates29.57556, -90.399
Functional classRural Local

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 inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than 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 alignment6: Equal to present minimum criteria
Operating rating52.1 US tons
Inventory rating40.3 US tons

Structure

Structure typeMovable - Lift
MaterialSteel
DeckOpen grating
Main spans1 (+7 approach)
Design loadHS 20
Structure length279 ft (85 m)
Longest span143 ft (43.6 m)
Deck width88 ft (26.9 m)
Roadway width29 ft (8.7 m)
Vertical clearance over deck18 ft (5.5 m)

Traffic and service

Average daily traffic1,928 (2020)
Projected traffic2,120 by 2040
Trucks—
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

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was T-Bois Bridge RD over Bayou Lafourche built?

It was built in 2007, making it 18 years old in 2025.

What condition is T-Bois Bridge RD 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 July 2023.

How much traffic does T-Bois Bridge RD over Bayou Lafourche carry?

About 1,928 vehicles per day (2020 count).

How long is T-Bois Bridge RD over Bayou Lafourche?

The structure is 279 ft (85 m) long with a longest span of 143 ft (43.6 m) and a deck 88 ft wide.

Who owns T-Bois Bridge RD over Bayou Lafourche?

It is owned by the County Highway Agency.