US Bridges

LA0660 over ST Louis Canal

Good

Terrebonne Parish, Louisiana · 3.0 MI North of LA 24 · Structure no. 025508550703031

Built
1958
67 years old
Condition
Good
inspected August 2024
Type
Slab
Concrete
Length
80 ft
4 main spans
Daily traffic
10,321
2021 count
Owner
State
State Highway Agency

About this bridge

LA0660 over ST Louis Canal is a concrete slab carrying LA0660 over ST Louis Canal in Terrebonne Parish, Louisiana. It was built in 1958, so it is 67 years old, older than the Louisiana average of 43 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 10,321 vehicles a day, roughly 11% of them trucks, projected to reach 11,353 by 2041. The structure is 80 ft (24.4 m) long and 30 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesLA0660
CrossesST Louis Canal
Location3.0 MI North of LA 24
RouteState Highway 660
CountyTerrebonne Parish
StateLouisiana
Coordinates29.64796, -90.7229
Functional classUrban Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating28.9 US tons
Inventory rating22.5 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans4
Design loadH 15
Structure length80 ft (24.4 m)
Longest span20 ft (6.1 m)
Deck width30 ft (9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,321 (2021)
Projected traffic11,353 by 2041
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$412,000
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0660 over ST Louis Canal built?

It was built in 1958, making it 67 years old in 2025.

What condition is LA0660 over ST Louis Canal in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2024.

How much traffic does LA0660 over ST Louis Canal carry?

About 10,321 vehicles per day (2021 count), of which roughly 11% are trucks.

How long is LA0660 over ST Louis Canal?

The structure is 80 ft (24.4 m) long with a longest span of 20 ft (6.1 m) and a deck 30 ft wide.

Who owns LA0660 over ST Louis Canal?

It is owned by the State Highway Agency.