Structure 22929357902341 · Lafourche County, LA

Hamilton ST over Forty Arpent Canal

Carries Hamilton ST over Forty Arpent Canal, 1.3 Mi N. Of La 308.

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 overall5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT52 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 4/9Superstructure 4/9Substructure 3/9 · sets the rating

52 ft end to end, longest span 17 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.

Built196066 years old
Length51.8 ft15.8 m
Daily traffic204counted 2020
Last inspectedJune 2024every 12 months

Location

StateLouisiana
CountyLafourche
Location1.3 Mi N. Of La 308
CarriesHamilton ST
CrossesForty Arpent Canal
Coordinates29.59601, -90.39070

Physical Characteristics

MaterialWood or Timber
DesignStringer/Multi-beam
Total Length51.8 ft (15.8 m)
Max Span17.1 ft (5.2 m)
Deck Width16.4 ft (5 m)
Deck Area79 sq m
Main Spans3
Year Built1960

Traffic

Avg Daily Traffic204 (2020)
Lanes On Bridge1

Inspection & Ownership

Last InspectionJune 2024
Inspection FrequencyEvery 12 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number022929357902341

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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