US Bridges

US0080 over Alligator Bayou

Poor

Bossier Parish, Louisiana · 1.2 MI E of LA782-2 · Structure no. 040800010306052

Built
1936
89 years old
Condition
Poor
inspected November 2024
Type
Slab
Concrete
Length
162 ft
8 main spans
Daily traffic
2,376
2021 count
Owner
State
State Highway Agency

About this bridge

US0080 over Alligator Bayou is a concrete slab carrying US0080 over Alligator Bayou in Bossier Parish, Louisiana. It was built in 1936, so it is 89 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 3 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 2,376 vehicles a day, roughly 8% of them trucks, projected to reach 2,613 by 2041. The structure is 162 ft (49.4 m) long and 28 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesUS0080
CrossesAlligator Bayou
Location1.2 MI E of LA782-2
RouteU.S. Route 80
CountyBossier Parish
StateLouisiana
Coordinates32.54023, -93.6516
Functional classUrban Other Principal Arterial

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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating27.4 US tons
Inventory rating21.4 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans8
Design loadH 15
Structure length162 ft (49.4 m)
Longest span20 ft (6.1 m)
Deck width28 ft (8.6 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,376 (2021)
Projected traffic2,613 by 2041
Trucks8%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes

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$748,000
NavigationNo navigation control on waterway

Frequently asked questions

When was US0080 over Alligator Bayou built?

It was built in 1936, making it 89 years old in 2025.

What condition is US0080 over Alligator Bayou 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 November 2024.

How much traffic does US0080 over Alligator Bayou carry?

About 2,376 vehicles per day (2021 count), of which roughly 8% are trucks.

How long is US0080 over Alligator Bayou?

The structure is 162 ft (49.4 m) long with a longest span of 20 ft (6.1 m) and a deck 28 ft wide.

Who owns US0080 over Alligator Bayou?

It is owned by the State Highway Agency.