US Bridges

LA0507 over Grand Bayou

FairPosted for load

Red River Parish, Louisiana · 1.73 MI North of US 71 · Structure no. 044103040101731

Built
1972
53 years old
Condition
Fair
inspected June 2023
Type
Slab
Concrete
Length
401 ft
21 main spans
Daily traffic
691
2021 count
Owner
State
State Highway Agency

About this bridge

LA0507 over Grand Bayou is a concrete slab carrying LA0507 over Grand Bayou in Red River Parish, Louisiana. It was built in 1972, so it is 53 years old, older than the Louisiana average of 43 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 691 vehicles a day, roughly 25% of them trucks, projected to reach 760 by 2041. The structure is 401 ft (122.2 m) long and 31 ft wide. If it were closed, the detour would be 13 mi (21 km).

Location

Open in Google Maps
CarriesLA0507
CrossesGrand Bayou
Location1.73 MI North of US 71
RouteState Highway 507
CountyRed River Parish
StateLouisiana
Coordinates31.99943, -93.2003
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating20.7 US tons
Inventory rating15.8 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans21
Design loadHS 20
Structure length401 ft (122.2 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 traffic691 (2021)
Projected traffic760 by 2041
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 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$1.7 million
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0507 over Grand Bayou built?

It was built in 1972, making it 53 years old in 2025.

What condition is LA0507 over Grand Bayou in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in June 2023.

How much traffic does LA0507 over Grand Bayou carry?

About 691 vehicles per day (2021 count), of which roughly 25% are trucks.

How long is LA0507 over Grand Bayou?

The structure is 401 ft (122.2 m) long with a longest span of 19 ft (5.8 m) and a deck 31 ft wide.

Who owns LA0507 over Grand Bayou?

It is owned by the State Highway Agency.