Structure 582103440102031 · Franklin County, LA

La0577 over Bull Bayou

Carries La0577 over Bull Bayou, 2.0 Mi East Of La 15.

Overall conditionPoor

Set by its lowest-rated component: Substructure at 4 of 9.

How ratings work
Deck7/9 · Good
Superstructure5/9 · Fair
Substructuresets the rating4/9 · Poor
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT78 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 5/9Substructure 4/9 · sets the rating

78 ft end to end, longest span 19 ft. Lengths and the car 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 multi-beam bridge.

Built195571 years old
Length78.1 ft23.8 m
Daily traffic1,341counted 2021
Last inspectedApril 2023every 12 months

Location

StateLouisiana
CountyFranklin
Location2.0 Mi East Of La 15
CarriesLa0577
CrossesBull Bayou
Coordinates32.24694, -91.70800

Physical Characteristics

MaterialWood or Timber
DesignStringer/Multi-beam
Total Length78.1 ft (23.8 m)
Max Span19.0 ft (5.8 m)
Deck Width27.6 ft (8.4 m)
Deck Area199.9 sq m
Main Spans4
Year Built1955

Traffic

Avg Daily Traffic1,341 (2021)
Truck Traffic21%
Lanes On Bridge2

Inspection & Ownership

Last InspectionApril 2023
Inspection FrequencyEvery 12 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number582103440102031

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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