US Bridges

LA0507 over Grand Bayou Relief

Poor

Red River Parish, Louisiana · 1.84 MI North of US 71 · Structure no. 044103040101871

Built
1976
49 years old
Condition
Poor
inspected June 2023
Type
Slab
Concrete
Length
153 ft
8 main spans
Daily traffic
691
2021 count
Owner
State
State Highway Agency

About this bridge

LA0507 over Grand Bayou Relief is a concrete slab carrying LA0507 over Grand Bayou Relief in Red River Parish, Louisiana. It was built in 1976, so it is 49 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 691 vehicles a day, roughly 25% of them trucks, projected to reach 760 by 2041. The structure is 153 ft (46.6 m) long and 31 ft wide. If it were closed, the detour would be 13 mi (21 km).

CarriesLA0507
CrossesGrand Bayou Relief
Location1.84 MI North of US 71
RouteState Highway 507
Coordinates32.0015, -93.2
Functional classRural Minor 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
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.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no 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 rating41.4 US tons
Inventory rating31.7 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans8
Design loadHS 20
Structure length153 ft (46.6 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
CrossesRelief for waterway
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$712,000
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0507 over Grand Bayou Relief built?

It was built in 1976, making it 49 years old in 2025.

What condition is LA0507 over Grand Bayou Relief 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 LA0507 over Grand Bayou Relief carry?

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

How long is LA0507 over Grand Bayou Relief?

The structure is 153 ft (46.6 m) long with a longest span of 19 ft (5.8 m) and a deck 31 ft wide.

Who owns LA0507 over Grand Bayou Relief?

It is owned by the State Highway Agency.