US Bridges

N Bayou Black DR over Terr. Laf. Drainage

FairPosted for load

Terrebonne Parish, Louisiana · 1.0 MI E of Sam Rapp St. · Structure no. 025529377905481

Built
1966
59 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
80 ft
1 main span
Daily traffic
1,248
2020 count
Owner
County
County Highway Agency

About this bridge

N Bayou Black DR over Terr. Laf. Drainage is a steel stringer/multi-beam or girder carrying N Bayou Black DR over Terr. Laf. Drainage in Terrebonne Parish, Louisiana. It was built in 1966, so it is 59 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 80 ft (24.4 m) long and 24 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesN Bayou Black DR
CrossesTerr. Laf. Drainage
Location1.0 MI E of Sam Rapp St.
RouteCounty Highway 0
CountyTerrebonne Parish
StateLouisiana
Coordinates29.62753, -90.91358
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
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 evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating25.4 US tons
Inventory rating19.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckOpen grating
Main spans1 (+2 approach)
Design loadHS 20
Structure length80 ft (24.4 m)
Longest span42 ft (12.8 m)
Deck width24 ft (7.3 m)
Roadway width22 ft (6.8 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 closed1.9 mi (3 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$288,000
NavigationNo navigation control on waterway

Frequently asked questions

When was N Bayou Black DR over Terr. Laf. Drainage built?

It was built in 1966, making it 59 years old in 2025.

What condition is N Bayou Black DR over Terr. Laf. Drainage 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 Terr. Laf. Drainage carry?

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

How long is N Bayou Black DR over Terr. Laf. Drainage?

The structure is 80 ft (24.4 m) long with a longest span of 42 ft (12.8 m) and a deck 24 ft wide.

Who owns N Bayou Black DR over Terr. Laf. Drainage?

It is owned by the County Highway Agency.