US Bridges

Roy Rd. over Blanc Bayou

PoorPosted for load

Acadia Parish, Louisiana · 0.7 Mi. S. of US 90 · Structure no. 030130094922681

Built
1965
60 years old, rebuilt 1999
Condition
Poor
inspected July 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
48 ft
3 main spans
Daily traffic
28
2020 count
Owner
County
County Highway Agency

About this bridge

Roy Rd. over Blanc Bayou is a wood or timber stringer/multi-beam or girder carrying Roy Rd. over Blanc Bayou in Acadia Parish, Louisiana. It was built in 1965 and reconstructed in 1999, so it is 60 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 28 vehicles a day, projected to reach 30 by 2040. The structure is 48 ft (14.6 m) long and 20 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesRoy Rd.
CrossesBlanc Bayou
Location0.7 Mi. S. of US 90
RouteCounty Highway 0
Coordinates30.17077, -92.447
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 inspectionJuly 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 alignment8: Equal to present desirable criteria
Operating rating27.4 US tons
Inventory rating20 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadH 10
Structure length48 ft (14.6 m)
Longest span16 ft (4.9 m)
Deck width20 ft (6.1 m)
Roadway width19 ft (5.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic28 (2020)
Projected traffic30 by 2040
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 Roy Rd. over Blanc Bayou built?

It was built in 1965, making it 60 years old in 2025. It was reconstructed in 1999.

What condition is Roy Rd. over Blanc 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 July 2024.

How much traffic does Roy Rd. over Blanc Bayou carry?

About 28 vehicles per day (2020 count).

How long is Roy Rd. over Blanc Bayou?

The structure is 48 ft (14.6 m) long with a longest span of 16 ft (4.9 m) and a deck 20 ft wide.

Who owns Roy Rd. over Blanc Bayou?

It is owned by the County Highway Agency.