US Bridges

LA0661 over Bayou Terrebonne

Fair

Terrebonne Parish, Louisiana · 0.05 MI North of LA 24 · Structure no. 025508550802451

Built
1999
26 years old
Condition
Fair
inspected July 2023
Type
Movable - Lift
Steel
Length
177 ft
1 main span
Daily traffic
5,780
2021 count
Owner
State
State Highway Agency

About this bridge

LA0661 over Bayou Terrebonne is a steel movable - lift carrying LA0661 over Bayou Terrebonne in Terrebonne Parish, Louisiana. It was built in 1999, so it is 26 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 5,780 vehicles a day, roughly 10% of them trucks, projected to reach 6,358 by 2041. The structure is 177 ft (53.9 m) long and 62 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesLA0661
CrossesBayou Terrebonne
Location0.05 MI North of LA 24
RouteState Highway 661
CountyTerrebonne Parish
StateLouisiana
Coordinates29.59761, -90.6957
Functional classUrban Other Principal 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 protection8 Very GoodNo problems noted.
Last inspectionJuly 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 alignment8: Equal to present desirable criteria
Operating rating68 US tons
Inventory rating41 US tons

Structure

Structure typeMovable - Lift
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+6 approach)
Design loadHS 20
Structure length177 ft (53.9 m)
Longest span57 ft (17.4 m)
Deck width62 ft (18.9 m)
Roadway width53 ft (16.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,780 (2021)
Projected traffic6,358 by 2041
Trucks10%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was LA0661 over Bayou Terrebonne built?

It was built in 1999, making it 26 years old in 2025.

What condition is LA0661 over Bayou Terrebonne 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 July 2023.

How much traffic does LA0661 over Bayou Terrebonne carry?

About 5,780 vehicles per day (2021 count), of which roughly 10% are trucks.

How long is LA0661 over Bayou Terrebonne?

The structure is 177 ft (53.9 m) long with a longest span of 57 ft (17.4 m) and a deck 62 ft wide.

Who owns LA0661 over Bayou Terrebonne?

It is owned by the State Highway Agency.