US Bridges

Dyer RD over South Bayou

PoorPosted for load

East Baton Rouge Parish, Louisiana · 3.5 MI.S.LA67 LA64 I · Structure no. 611730357910651

Built
1960
65 years old
Condition
Poor
inspected June 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
116 ft
6 main spans
Daily traffic
1,636
2019 count
Owner
County
County Highway Agency

About this bridge

Dyer RD over South Bayou is a wood or timber stringer/multi-beam or girder carrying Dyer RD over South Bayou in East Baton Rouge Parish, Louisiana. It was built in 1960, so it is 65 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 4 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 1,636 vehicles a day, projected to reach 1,799 by 2039. The structure is 116 ft (35.4 m) long and 25 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesDyer RD
CrossesSouth Bayou
Location3.5 MI.S.LA67 LA64 I
RouteCounty Highway 0
CountyEast Baton Rouge Parish
StateLouisiana
Coordinates30.59659, -91.10882
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.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating16.3 US tons
Inventory rating10 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckConcrete, cast-in-place
Main spans6
Design loadH 20
Structure length116 ft (35.4 m)
Longest span19 ft (5.8 m)
Deck width25 ft (7.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,636 (2019)
Projected traffic1,799 by 2039
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 Dyer RD over South Bayou built?

It was built in 1960, making it 65 years old in 2025.

What condition is Dyer RD over South 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 June 2023.

How much traffic does Dyer RD over South Bayou carry?

About 1,636 vehicles per day (2019 count).

How long is Dyer RD over South Bayou?

The structure is 116 ft (35.4 m) long with a longest span of 19 ft (5.8 m) and a deck 25 ft wide.

Who owns Dyer RD over South Bayou?

It is owned by the County Highway Agency.