US Bridges

Caroll ST over Black Bayou

Good

Terrebonne Parish, Louisiana · 0.1 Mi. S. of LA 20 · Structure no. 025500000025502

Built
2020
5 years old
Condition
Good
inspected April 2023
Type
Slab
Concrete
Length
115 ft
6 main spans
Daily traffic
1,929
2020 count
Owner
County
County Highway Agency

About this bridge

Caroll ST over Black Bayou is a concrete slab carrying Caroll ST over Black Bayou in Terrebonne Parish, Louisiana. It was built in 2020, so it is 5 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,929 vehicles a day, roughly 5% of them trucks, projected to reach 2,121 by 2040. The structure is 115 ft (35.1 m) long and 36 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesCaroll ST
CrossesBlack Bayou
Location0.1 Mi. S. of LA 20
RouteCounty Highway 0
CountyTerrebonne Parish
StateLouisiana
Coordinates29.6868, -90.99078
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
Deck9 ExcellentNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure8 Very GoodNo problems noted.
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 evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66.8 US tons
Inventory rating51.8 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans6
Design loadGreater than HL 93
Structure length115 ft (35.1 m)
Longest span20 ft (6.1 m)
Deck width36 ft (11 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,929 (2020)
Projected traffic2,121 by 2040
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
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 Caroll ST over Black Bayou built?

It was built in 2020, making it 5 years old in 2025.

What condition is Caroll ST over Black Bayou 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 Caroll ST over Black Bayou carry?

About 1,929 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is Caroll ST over Black Bayou?

The structure is 115 ft (35.1 m) long with a longest span of 20 ft (6.1 m) and a deck 36 ft wide.

Who owns Caroll ST over Black Bayou?

It is owned by the County Highway Agency.