US Bridges

US0371 over Grand Bayou

Fair

Red River Parish, Louisiana · 2.37 MI North of US 72 · Structure no. 044100270102371

Built
1966
59 years old
Condition
Fair
inspected June 2024
Type
Slab
Concrete
Length
220 ft
11 main spans
Daily traffic
2,500
2021 count
Owner
State
State Highway Agency

About this bridge

US0371 over Grand Bayou is a concrete slab carrying US0371 over Grand Bayou in Red River Parish, Louisiana. It was built in 1966, so it is 59 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.

It carries about 2,500 vehicles a day, roughly 26% of them trucks, projected to reach 2,750 by 2041. The structure is 220 ft (67.1 m) long and 33 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesUS0371
CrossesGrand Bayou
Location2.37 MI North of US 72
RouteU.S. Route 371
CountyRed River Parish
StateLouisiana
Coordinates32.07592, -93.3225
Functional classRural Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating79 US tons
Inventory rating48 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans11
Design loadHS 20
Structure length220 ft (67.1 m)
Longest span20 ft (6.1 m)
Deck width33 ft (10.1 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,500 (2021)
Projected traffic2,750 by 2041
Trucks26%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was US0371 over Grand Bayou built?

It was built in 1966, making it 59 years old in 2025.

What condition is US0371 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 2024.

How much traffic does US0371 over Grand Bayou carry?

About 2,500 vehicles per day (2021 count), of which roughly 26% are trucks.

How long is US0371 over Grand Bayou?

The structure is 220 ft (67.1 m) long with a longest span of 20 ft (6.1 m) and a deck 33 ft wide.

Who owns US0371 over Grand Bayou?

It is owned by the State Highway Agency.