US Bridges

Troy ST over Drain Bayou

PoorPosted for load

East Baton Rouge Parish, Louisiana · Troy Street · Structure no. 611730331910821

Built
1975
50 years old
Condition
Poor
inspected December 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
38 ft
2 main spans
Daily traffic
600
2019 count
Owner
County
County Highway Agency

About this bridge

Troy ST over Drain Bayou is a wood or timber stringer/multi-beam or girder carrying Troy ST over Drain Bayou in East Baton Rouge Parish, Louisiana. It was built in 1975, so it is 50 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: posted for load restriction.

It carries about 600 vehicles a day, projected to reach 660 by 2039. The structure is 38 ft (11.6 m) long and 25 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesTroy ST
CrossesDrain Bayou
LocationTroy Street
RouteCounty Highway 0
Coordinates30.55187, -91.13848
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionDecember 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 adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating29.3 US tons
Inventory rating22.5 US tons

Structure

MaterialWood or Timber
DeckOther
Main spans2
Design loadH 20
Structure length38 ft (11.6 m)
Longest span19 ft (5.8 m)
Deck width25 ft (7.6 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic600 (2019)
Projected traffic660 by 2039
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$160,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Troy ST over Drain Bayou built?

It was built in 1975, making it 50 years old in 2025.

What condition is Troy ST over Drain 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 December 2024.

How much traffic does Troy ST over Drain Bayou carry?

About 600 vehicles per day (2019 count).

How long is Troy ST over Drain Bayou?

The structure is 38 ft (11.6 m) long with a longest span of 19 ft (5.8 m) and a deck 25 ft wide.

Who owns Troy ST over Drain Bayou?

It is owned by the County Highway Agency.