US Bridges

US0071 over Loggy Bayou

Fair

Bossier Parish, Louisiana · 0.2 MI NW of LA 4 · Structure no. 040800100500001

Built
1990
35 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
663 ft
9 main spans
Daily traffic
816
2021 count
Owner
State
State Highway Agency

About this bridge

US0071 over Loggy Bayou is a prestressed concrete stringer/multi-beam or girder carrying US0071 over Loggy Bayou in Bossier Parish, Louisiana. It was built in 1990, so it is 35 years old, younger 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 816 vehicles a day, roughly 26% of them trucks, projected to reach 897 by 2041. The structure is 663 ft (202.1 m) long and 47 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

CarriesUS0071
CrossesLoggy Bayou
Location0.2 MI NW of LA 4
RouteU.S. Route 71
Coordinates32.23683, -93.4262
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70 US tons
Inventory rating41 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans9
Design loadHS 20
Structure length663 ft (202.1 m)
Longest span120 ft (36.6 m)
Deck width47 ft (14.3 m)
Roadway width44 ft (13.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic816 (2021)
Projected traffic897 by 2041
Trucks26%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 US0071 over Loggy Bayou built?

It was built in 1990, making it 35 years old in 2025.

What condition is US0071 over Loggy 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 November 2024.

How much traffic does US0071 over Loggy Bayou carry?

About 816 vehicles per day (2021 count), of which roughly 26% are trucks.

How long is US0071 over Loggy Bayou?

The structure is 663 ft (202.1 m) long with a longest span of 120 ft (36.6 m) and a deck 47 ft wide.

Who owns US0071 over Loggy Bayou?

It is owned by the State Highway Agency.