US Bridges

LA3220 over Bayou Lafourche

Fair

Lafourche Parish, Louisiana · .01 MI East of LA 1 · Structure no. 022908292700011

Built
1986
39 years old
Condition
Fair
inspected August 2023
Type
Movable - Swing
Steel
Length
267 ft
1 main span
Daily traffic
3,859
2021 count
Owner
State
State Highway Agency

About this bridge

LA3220 over Bayou Lafourche is a steel movable - swing carrying LA3220 over Bayou Lafourche in Lafourche Parish, Louisiana. It was built in 1986, so it is 39 years old, younger 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 3,859 vehicles a day, roughly 11% of them trucks, projected to reach 4,244 by 2041. The structure is 267 ft (81.4 m) long and 35 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesLA3220
CrossesBayou Lafourche
Location.01 MI East of LA 1
RouteState Highway 3220
CountyLafourche Parish
StateLouisiana
Coordinates29.63673, -90.5127
Functional classUrban Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 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 alignment6: Equal to present minimum criteria
Operating rating61.9 US tons
Inventory rating37 US tons

Structure

Structure typeMovable - Swing
MaterialSteel
DeckOpen grating
Main spans1 (+4 approach)
Design loadHS 20
Structure length267 ft (81.4 m)
Longest span187 ft (57 m)
Deck width35 ft (10.6 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deck19 ft (5.8 m)

Traffic and service

Average daily traffic3,859 (2021)
Projected traffic4,244 by 2041
Trucks11%
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

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was LA3220 over Bayou Lafourche built?

It was built in 1986, making it 39 years old in 2025.

What condition is LA3220 over Bayou Lafourche 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 August 2023.

How much traffic does LA3220 over Bayou Lafourche carry?

About 3,859 vehicles per day (2021 count), of which roughly 11% are trucks.

How long is LA3220 over Bayou Lafourche?

The structure is 267 ft (81.4 m) long with a longest span of 187 ft (57 m) and a deck 35 ft wide.

Who owns LA3220 over Bayou Lafourche?

It is owned by the State Highway Agency.