US Bridges

LA0670 over Bayou Teche

Fair

St. Mary Parish, Louisiana · 0.017 M E of LA 182 · Structure no. 035108510400171

Built
1990
35 years old
Condition
Fair
inspected August 2024
Type
Movable - Swing
Steel
Length
283 ft
2 main spans
Daily traffic
661
2021 count
Owner
State
State Highway Agency

About this bridge

LA0670 over Bayou Teche is a steel movable - swing carrying LA0670 over Bayou Teche in St. Mary Parish, Louisiana. It was built in 1990, so it is 35 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 661 vehicles a day, roughly 12% of them trucks, projected to reach 727 by 2041. The structure is 283 ft (86.3 m) long and 35 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesLA0670
CrossesBayou Teche
Location0.017 M E of LA 182
RouteState Highway 670
CountySt. Mary Parish
StateLouisiana
Coordinates29.87888, -91.5862
Functional classRural Minor Collector

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.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating28.2 US tons
Inventory rating21.8 US tons

Structure

Structure typeMovable - Swing
MaterialSteel
DeckOpen grating
Main spans2 (+6 approach)
Design loadHS 20
Structure length283 ft (86.3 m)
Longest span135 ft (41.1 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 traffic661 (2021)
Projected traffic727 by 2041
Trucks12%
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 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 LA0670 over Bayou Teche built?

It was built in 1990, making it 35 years old in 2025.

What condition is LA0670 over Bayou Teche 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 LA0670 over Bayou Teche carry?

About 661 vehicles per day (2021 count), of which roughly 12% are trucks.

How long is LA0670 over Bayou Teche?

The structure is 283 ft (86.3 m) long with a longest span of 135 ft (41.1 m) and a deck 35 ft wide.

Who owns LA0670 over Bayou Teche?

It is owned by the State Highway Agency.