US Bridges

Lower Zachary RD over White Bayou

PoorClosed to traffic

East Baton Rouge Parish, Louisiana · 1.1 Mi. W. of LA 67 · Structure no. 611730383910721

Built
1970
55 years old
Condition
Poor
inspected April 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
96 ft
5 main spans
Daily traffic
1,087
2022 count
Owner
County
County Highway Agency

About this bridge

Lower Zachary RD over White Bayou is a wood or timber stringer/multi-beam or girder carrying Lower Zachary RD over White Bayou in East Baton Rouge Parish, Louisiana. It was built in 1970, so it is 55 years old, older 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: closed to all traffic.

It carries about 1,087 vehicles a day, projected to reach 1,195 by 2042. The structure is 96 ft (29.3 m) long and 25 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesLower Zachary RD
CrossesWhite Bayou
Location1.1 Mi. W. of LA 67
RouteCounty Highway 0
Coordinates30.63724, -91.12739
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.
Superstructure7 GoodSome minor problems.
Substructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 12 months
Operating statusClosed to all traffic
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating34 US tons
Inventory rating26.1 US tons

Structure

MaterialWood or Timber
DeckConcrete, cast-in-place
Main spans5
Design loadH 20
Structure length96 ft (29.3 m)
Longest span19 ft (5.8 m)
Deck width25 ft (7.7 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,087 (2022)
Projected traffic1,195 by 2042
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Lower Zachary RD over White Bayou built?

It was built in 1970, making it 55 years old in 2025.

What condition is Lower Zachary RD over White 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 Lower Zachary RD over White Bayou carry?

About 1,087 vehicles per day (2022 count).

How long is Lower Zachary RD over White Bayou?

The structure is 96 ft (29.3 m) long with a longest span of 19 ft (5.8 m) and a deck 25 ft wide.

Who owns Lower Zachary RD over White Bayou?

It is owned by the County Highway Agency.