US Bridges

LA0509 over Crooked Bayou

Poor

Red River Parish, Louisiana · .90 MI West of LA 1 · Structure no. 044101050301111

Built
1978
47 years old
Condition
Poor
inspected June 2024
Type
Slab
Concrete
Length
115 ft
6 main spans
Daily traffic
1,975
2021 count
Owner
State
State Highway Agency

About this bridge

LA0509 over Crooked Bayou is a concrete slab carrying LA0509 over Crooked Bayou in Red River Parish, Louisiana. It was built in 1978, so it is 47 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.

It carries about 1,975 vehicles a day, roughly 19% of them trucks, projected to reach 2,172 by 2041. The structure is 115 ft (35.1 m) long and 31 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesLA0509
CrossesCrooked Bayou
Location.90 MI West of LA 1
RouteState Highway 509
Coordinates32.13601, -93.4944
Functional classRural Major Collector

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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating32.8 US tons
Inventory rating25.4 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans6
Design loadHS 20
Structure length115 ft (35.1 m)
Longest span19 ft (5.8 m)
Deck width31 ft (9.4 m)
Roadway width29 ft (8.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,975 (2021)
Projected traffic2,172 by 2041
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$561,000
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0509 over Crooked Bayou built?

It was built in 1978, making it 47 years old in 2025.

What condition is LA0509 over Crooked 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 2024.

How much traffic does LA0509 over Crooked Bayou carry?

About 1,975 vehicles per day (2021 count), of which roughly 19% are trucks.

How long is LA0509 over Crooked Bayou?

The structure is 115 ft (35.1 m) long with a longest span of 19 ft (5.8 m) and a deck 31 ft wide.

Who owns LA0509 over Crooked Bayou?

It is owned by the State Highway Agency.