US Bridges

US0071 over Bayou Grappe

Fair

Grant Parish, Louisiana · .5 MI North of LA 471 · Structure no. 082200090302271

Built
1931
94 years old
Condition
Fair
inspected July 2024
Type
Tee Beam
Concrete
Length
91 ft
3 main spans
Daily traffic
1,977
2021 count
Owner
State
State Highway Agency

About this bridge

US0071 over Bayou Grappe is a concrete tee beam carrying US0071 over Bayou Grappe in Grant Parish, Louisiana. It was built in 1931, so it is 94 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 6 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 1,977 vehicles a day, roughly 15% of them trucks, projected to reach 2,174 by 2041. The structure is 91 ft (27.7 m) long and 27 ft wide. If it were closed, the detour would be 13 mi (21 km).

Location

Open in Google Maps
CarriesUS0071
CrossesBayou Grappe
Location.5 MI North of LA 471
RouteU.S. Route 71
CountyGrant Parish
StateLouisiana
Coordinates31.5722, -92.7404
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66 US tons
Inventory rating39 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length91 ft (27.7 m)
Longest span30 ft (9.1 m)
Deck width27 ft (8.3 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,977 (2021)
Projected traffic2,174 by 2041
Trucks15%
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$478,000
NavigationNo navigation control on waterway

Frequently asked questions

When was US0071 over Bayou Grappe built?

It was built in 1931, making it 94 years old in 2025.

What condition is US0071 over Bayou Grappe 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 July 2024.

How much traffic does US0071 over Bayou Grappe carry?

About 1,977 vehicles per day (2021 count), of which roughly 15% are trucks.

How long is US0071 over Bayou Grappe?

The structure is 91 ft (27.7 m) long with a longest span of 30 ft (9.1 m) and a deck 27 ft wide.

Who owns US0071 over Bayou Grappe?

It is owned by the State Highway Agency.