Structure 40800010306052 · Bossier County, LA

Us0080 over Alligator Bayou

Carries Us0080 over Alligator Bayou, 1.2 Mi E Of La782-2.

Overall conditionPoor

Set by its lowest-rated component: Substructure at 3 of 9.

How ratings work
Deck4/9 · Poor
Superstructure4/9 · Poor
Substructuresets the rating3/9 · Serious
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT162 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 4/9Superstructure 4/9Substructure 3/9 · sets the rating

162 ft end to end, longest span 20 ft: about 2 semi-trucks nose to tail. Lengths and the semi-truck on the deck are drawn to the same scale. Each part is colored by its latest inspection rating. The inventory records lengths but not heights or the layout of the shorter spans, so those are drawn as typical for a slab bridge.

Built193690 years old
Length162.1 ft49.4 m
Daily traffic2,376counted 2021
Last inspectedNovember 2024every 12 months

Location

StateLouisiana
CountyBossier
Location1.2 Mi E Of La782-2
CarriesUs0080
CrossesAlligator Bayou
Coordinates32.54023, -93.65160

Physical Characteristics

MaterialConcrete
DesignSlab
Total Length162.1 ft (49.4 m)
Max Span20.0 ft (6.1 m)
Deck Width28.2 ft (8.6 m)
Deck Area424.8 sq m
Main Spans8
Year Built1936

Traffic

Avg Daily Traffic2,376 (2021)
Truck Traffic8%
Lanes On Bridge2

Inspection & Ownership

Last InspectionNovember 2024
Inspection FrequencyEvery 12 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number040800010306052

How Bridge Ratings Work

Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."

0Failed
1Imminent failure
2Critical
3Serious
4Poor
5Fair
6Satisfactory
7Good
8Very good
9Excellent
Good · lowest component 7–9
Fair · lowest component 5–6
Poor · lowest component 0–4

A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.

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