US Bridges

LA3361 over Teche Bayou

FairPosted for load

St. Martin Parish, Louisiana · 0.1 Mi. E of LA 31 · Structure no. 035000560400141

Built
1951
74 years old
Condition
Fair
inspected August 2024
Type
Movable - Lift
Steel
Length
281 ft
1 main span
Daily traffic
6,798
2021 count
Owner
State
State Highway Agency

About this bridge

LA3361 over Teche Bayou is a steel movable - lift carrying LA3361 over Teche Bayou in St. Martin Parish, Louisiana. It was built in 1951, so it is 74 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. Its operating status is: posted for load restriction.

It carries about 6,798 vehicles a day, roughly 9% of them trucks, projected to reach 7,477 by 2041. The structure is 281 ft (85.6 m) long and 37 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesLA3361
CrossesTeche Bayou
Location0.1 Mi. E of LA 31
RouteState Highway 3361
CountySt. Martin Parish
StateLouisiana
Coordinates30.27536, -91.8978
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39 US tons
Inventory rating16 US tons

Structure

Structure typeMovable - Lift
MaterialSteel
DeckOpen grating
Main spans1 (+7 approach)
Design loadH 15
Structure length281 ft (85.6 m)
Longest span66 ft (20.1 m)
Deck width37 ft (11.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deck15 ft (4.6 m)

Traffic and service

Average daily traffic6,798 (2021)
Projected traffic7,477 by 2041
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.2 million
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was LA3361 over Teche Bayou built?

It was built in 1951, making it 74 years old in 2025.

What condition is LA3361 over Teche Bayou 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 2024.

How much traffic does LA3361 over Teche Bayou carry?

About 6,798 vehicles per day (2021 count), of which roughly 9% are trucks.

How long is LA3361 over Teche Bayou?

The structure is 281 ft (85.6 m) long with a longest span of 66 ft (20.1 m) and a deck 37 ft wide.

Who owns LA3361 over Teche Bayou?

It is owned by the State Highway Agency.