US Bridges

Blanchard RD over Bayou Black

Fair

Terrebonne Parish, Louisiana · 0.01 MI N of LA 182 · Structure no. 025529365905131

Built
1976
49 years old
Condition
Fair
inspected April 2023
Type
Slab
Concrete
Length
76 ft
4 main spans
Daily traffic
745
2020 count
Owner
County
County Highway Agency

About this bridge

Blanchard RD over Bayou Black is a concrete slab carrying Blanchard RD over Bayou Black in Terrebonne Parish, Louisiana. It was built in 1976, so it is 49 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.

It carries about 745 vehicles a day, projected to reach 819 by 2040. The structure is 76 ft (23.2 m) long and 35 ft wide.

Location

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CarriesBlanchard RD
CrossesBayou Black
Location0.01 MI N of LA 182
RouteCounty Highway 0
CountyTerrebonne Parish
StateLouisiana
Coordinates29.60853, -90.85489
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating31.4 US tons
Inventory rating21.4 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans4
Design loadUnknown
Structure length76 ft (23.2 m)
Longest span19 ft (5.8 m)
Deck width35 ft (10.7 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic745 (2020)
Projected traffic819 by 2040
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Blanchard RD over Bayou Black built?

It was built in 1976, making it 49 years old in 2025.

What condition is Blanchard RD over Bayou Black 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 Blanchard RD over Bayou Black carry?

About 745 vehicles per day (2020 count).

How long is Blanchard RD over Bayou Black?

The structure is 76 ft (23.2 m) long with a longest span of 19 ft (5.8 m) and a deck 35 ft wide.

Who owns Blanchard RD over Bayou Black?

It is owned by the County Highway Agency.