Structure 616330532912901 · West Feliciana County, LA

Plettenberg Road over Polly Creek

Carries Plettenberg Road over Polly Creek, 3.5 Mi. SW Of La968.

Overall conditionPoor

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

How ratings work
Deck5/9 · Fair
Superstructure6/9 · Satisfactory
Substructuresets the rating3/9 · Serious
Channelnot part of overall5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT110 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9Superstructure 6/9Substructure 3/9 · sets the rating

110 ft end to end, longest span 40 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.

Built197551 years old
Length109.9 ft33.5 m
Daily traffic110counted 2020
Last inspectedSeptember 2024every 12 months

Location

StateLouisiana
CountyWest Feliciana
Location3.5 Mi. SW Of La968
CarriesPlettenberg Road
CrossesPolly Creek
Coordinates30.88548, -91.48376

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length109.9 ft (33.5 m)
Max Span40.0 ft (12.2 m)
Deck Width24.0 ft (7.3 m)
Deck Area244.6 sq m
Main Spans5
Year Built1975

Traffic

Avg Daily Traffic110 (2020)
Lanes On Bridge2

Inspection & Ownership

Last InspectionSeptember 2024
Inspection FrequencyEvery 12 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number616330532912901

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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