US Bridges

LA0661 over Bayou Lacarpe

Fair

Terrebonne Parish, Louisiana · .48 MI North of LA 315 · Structure no. 025508550800481

Built
1965
60 years old
Condition
Fair
inspected September 2024
Type
Movable - Lift
Steel
Length
196 ft
1 main span
Daily traffic
10,945
2021 count
Owner
State
State Highway Agency

About this bridge

LA0661 over Bayou Lacarpe is a steel movable - lift carrying LA0661 over Bayou Lacarpe in Terrebonne Parish, Louisiana. It was built in 1965, so it is 60 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.

It carries about 10,945 vehicles a day, roughly 11% of them trucks, projected to reach 12,039 by 2041. The structure is 196 ft (59.7 m) long and 31 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesLA0661
CrossesBayou Lacarpe
Location.48 MI North of LA 315
RouteState Highway 661
CountyTerrebonne Parish
StateLouisiana
Coordinates29.57355, -90.7123
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating28.5 US tons
Inventory rating21.8 US tons

Structure

Structure typeMovable - Lift
MaterialSteel
DeckOpen grating
Main spans1 (+6 approach)
Design loadH 15
Structure length196 ft (59.7 m)
Longest span76 ft (23.2 m)
Deck width31 ft (9.5 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deck17 ft (5.1 m)

Traffic and service

Average daily traffic10,945 (2021)
Projected traffic12,039 by 2041
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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$880,000
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was LA0661 over Bayou Lacarpe built?

It was built in 1965, making it 60 years old in 2025.

What condition is LA0661 over Bayou Lacarpe 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 September 2024.

How much traffic does LA0661 over Bayou Lacarpe carry?

About 10,945 vehicles per day (2021 count), of which roughly 11% are trucks.

How long is LA0661 over Bayou Lacarpe?

The structure is 196 ft (59.7 m) long with a longest span of 76 ft (23.2 m) and a deck 31 ft wide.

Who owns LA0661 over Bayou Lacarpe?

It is owned by the State Highway Agency.