Structure 40900780200151 · Caddo County, LA

La0538 over Twelve Mile Bayou

Carries La0538 over Twelve Mile Bayou, 00.15 Mi N. Of La 3049.

Overall conditionFair

Set by its lowest-rated component: Substructure at 6 of 9.

How ratings work
Deck7/9 · Good
Superstructure7/9 · Good
Substructuresets the rating6/9 · Satisfactory
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT760 FT OVERALL100 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 6/9 · sets the rating

760 ft end to end, longest span 180 ft: about 2.1 football fields. 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 multi-beam bridge.

Built200521 years old
Length759.8 ft231.6 m
Daily traffic6,777counted 2021
Last inspectedJanuary 2025every 48 months

Location

StateLouisiana
CountyCaddo
Location00.15 Mi N. Of La 3049
CarriesLa0538
CrossesTwelve Mile Bayou
Coordinates32.55554, -93.77330

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length759.8 ft (231.6 m)
Max Span180.1 ft (54.9 m)
Deck Width42.7 ft (13 m)
Deck Area3010.8 sq m
Main Spans4
Year Built2005

Traffic

Avg Daily Traffic6,777 (2021)
Truck Traffic10%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJanuary 2025
Inspection FrequencyEvery 48 months
OwnerState Highway Agency
Historical SignificanceHistorical significance is not determined
Scour Critical8 — Stable, low risk
Structure Number040900780200151

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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