US Bridges

ST John Bridge over Bayou Lafourche

GoodPosted for load

Lafourche Parish, Louisiana · 0.01 MI S. of LA 308 · Structure no. 022929490905281

Built
2006
19 years old
Condition
Good
inspected June 2023
Type
Slab
Concrete
Length
180 ft
9 main spans
Daily traffic
2,824
2020 count
Owner
County
County Highway Agency

About this bridge

ST John Bridge over Bayou Lafourche is a concrete slab carrying ST John Bridge over Bayou Lafourche in Lafourche Parish, Louisiana. It was built in 2006, so it is 19 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. Its operating status is: posted for load restriction.

It carries about 2,824 vehicles a day, projected to reach 3,106 by 2040. The structure is 180 ft (54.9 m) long and 31 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesST John Bridge
CrossesBayou Lafourche
Location0.01 MI S. of LA 308
RouteCounty Highway 0
CountyLafourche Parish
StateLouisiana
Coordinates29.8166, -90.88045
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 inspectionJune 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than 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 alignment6: Equal to present minimum criteria
Operating rating45 US tons
Inventory rating34.6 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans9
Design loadHS 20
Structure length180 ft (54.9 m)
Longest span20 ft (6.1 m)
Deck width31 ft (9.6 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,824 (2020)
Projected traffic3,106 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was ST John Bridge over Bayou Lafourche built?

It was built in 2006, making it 19 years old in 2025.

What condition is ST John Bridge 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 ST John Bridge over Bayou Lafourche carry?

About 2,824 vehicles per day (2020 count).

How long is ST John Bridge over Bayou Lafourche?

The structure is 180 ft (54.9 m) long with a longest span of 20 ft (6.1 m) and a deck 31 ft wide.

Who owns ST John Bridge over Bayou Lafourche?

It is owned by the County Highway Agency.