US Bridges

N Bayou Black DR over Coulee

FairPosted for load

Terrebonne Parish, Louisiana · 0.9 MI SE of Diana St. · Structure no. 025529370905381

Built
1974
51 years old
Condition
Fair
inspected April 2023
Type
Slab
Concrete
Length
57 ft
3 main spans
Daily traffic
1,248
2020 count
Owner
County
County Highway Agency

About this bridge

N Bayou Black DR over Coulee is a concrete slab carrying N Bayou Black DR over Coulee in Terrebonne Parish, Louisiana. It was built in 1974, so it is 51 years old, older 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. Its operating status is: posted for load restriction.

It carries about 1,248 vehicles a day, projected to reach 1,372 by 2040. The structure is 57 ft (17.4 m) long and 26 ft wide.

Location

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CarriesN Bayou Black DR
CrossesCoulee
Location0.9 MI SE of Diana St.
RouteCounty Highway 0
CountyTerrebonne Parish
StateLouisiana
Coordinates29.61635, -90.89672
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating25.7 US tons
Inventory rating20 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length57 ft (17.4 m)
Longest span19 ft (5.8 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,248 (2020)
Projected traffic1,372 by 2040
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$217,000
NavigationNo navigation control on waterway

Frequently asked questions

When was N Bayou Black DR over Coulee built?

It was built in 1974, making it 51 years old in 2025.

What condition is N Bayou Black DR over Coulee 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 April 2023.

How much traffic does N Bayou Black DR over Coulee carry?

About 1,248 vehicles per day (2020 count).

How long is N Bayou Black DR over Coulee?

The structure is 57 ft (17.4 m) long with a longest span of 19 ft (5.8 m) and a deck 26 ft wide.

Who owns N Bayou Black DR over Coulee?

It is owned by the County Highway Agency.