US Bridges

Thompson RD over Bayou Petit Caillou

Good

Terrebonne Parish, Louisiana · 1.3 Mi. E. of LA 57 · Structure no. 025500000020544

Built
2016
9 years old
Condition
Good
inspected April 2023
Type
Slab
Concrete
Length
160 ft
8 main spans
Daily traffic
4,256
2021 count
Owner
County
County Highway Agency

About this bridge

Thompson RD over Bayou Petit Caillou is a concrete slab carrying Thompson RD over Bayou Petit Caillou in Terrebonne Parish, Louisiana. It was built in 2016, so it is 9 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 4,256 vehicles a day, projected to reach 4,681 by 2041. The structure is 160 ft (48.8 m) long and 42 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesThompson RD
CrossesBayou Petit Caillou
Location1.3 Mi. E. of LA 57
RouteCounty Highway 0
Coordinates29.54545, -90.65604
Functional classRural Local

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 protection8 Very GoodNo problems noted.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53.9 US tons
Inventory rating41.8 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans8
Design loadHL 93
Structure length160 ft (48.8 m)
Longest span20 ft (6.1 m)
Deck width42 ft (12.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,256 (2021)
Projected traffic4,681 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

OwnerCounty Highway Agency
Maintained byCounty 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 Thompson RD over Bayou Petit Caillou built?

It was built in 2016, making it 9 years old in 2025.

What condition is Thompson RD over Bayou Petit Caillou 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 April 2023.

How much traffic does Thompson RD over Bayou Petit Caillou carry?

About 4,256 vehicles per day (2021 count).

How long is Thompson RD over Bayou Petit Caillou?

The structure is 160 ft (48.8 m) long with a longest span of 20 ft (6.1 m) and a deck 42 ft wide.

Who owns Thompson RD over Bayou Petit Caillou?

It is owned by the County Highway Agency.