US Bridges

LA0660 over Bayou Terrebonne

Good

Terrebonne Parish, Louisiana · 2.0 MI S of US 90 · Structure no. 025500000020000

Built
2019
6 years old
Condition
Good
inspected May 2024
Type
Culvert
Steel
Length
30 ft
3 main spans
Daily traffic
10,321
2021 count
Owner
State
State Highway Agency

About this bridge

LA0660 over Bayou Terrebonne is a steel culvert carrying LA0660 over Bayou Terrebonne in Terrebonne Parish, Louisiana. It was built in 2019, so it is 6 years old, younger 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, projected to reach 11,353 by 2041. The structure is 30 ft (9.1 m) long and 116 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesLA0660
CrossesBayou Terrebonne
Location2.0 MI S of US 90
RouteState Highway 660
CountyTerrebonne Parish
StateLouisiana
Coordinates29.65542, -90.76649
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
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107.1 US tons
Inventory rating82.1 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans3
Design loadGreater than HL 93
Structure length30 ft (9.1 m)
Longest span8 ft (2.4 m)
Deck width116 ft (35.4 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,321 (2021)
Projected traffic11,353 by 2041
Trucks—
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 statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0660 over Bayou Terrebonne built?

It was built in 2019, making it 6 years old in 2025.

What condition is LA0660 over Bayou Terrebonne 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 May 2024.

How much traffic does LA0660 over Bayou Terrebonne carry?

About 10,321 vehicles per day (2021 count).

How long is LA0660 over Bayou Terrebonne?

The structure is 30 ft (9.1 m) long with a longest span of 8 ft (2.4 m) and a deck 116 ft wide.

Who owns LA0660 over Bayou Terrebonne?

It is owned by the State Highway Agency.