US Bridges

Black RD over Drainage Bayou

PoorPosted for load

East Baton Rouge Parish, Louisiana · 2.3 MI E LA 64 LA67 JCT · Structure no. 611730389910041

Built
1988
37 years old
Condition
Poor
inspected April 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
45 ft
4 main spans
Daily traffic
4
2019 count
Owner
County
County Highway Agency

About this bridge

Black RD over Drainage Bayou is a wood or timber stringer/multi-beam or girder carrying Black RD over Drainage Bayou in East Baton Rouge Parish, Louisiana. It was built in 1988, so it is 37 years old, younger than the Louisiana average of 43 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 4 vehicles a day, projected to reach 4 by 2039. The structure is 45 ft (13.7 m) long and 19 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesBlack RD
CrossesDrainage Bayou
Location2.3 MI E LA 64 LA67 JCT
RouteCounty Highway 0
Coordinates30.64982, -91.06583
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
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 rating29.3 US tons
Inventory rating22.8 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans4
Design loadH 20
Structure length45 ft (13.7 m)
Longest span19 ft (5.8 m)
Deck width19 ft (5.8 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4 (2019)
Projected traffic4 by 2039
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesOther
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Black RD over Drainage Bayou built?

It was built in 1988, making it 37 years old in 2025.

What condition is Black RD over Drainage Bayou in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in April 2024.

How much traffic does Black RD over Drainage Bayou carry?

About 4 vehicles per day (2019 count).

How long is Black RD over Drainage Bayou?

The structure is 45 ft (13.7 m) long with a longest span of 19 ft (5.8 m) and a deck 19 ft wide.

Who owns Black RD over Drainage Bayou?

It is owned by the County Highway Agency.