Structure 625230364901311 · St. Tammany County, LA

N. Wllie RD over Drainage Ditch

Carries N. Wllie RD over Drainage Ditch, 2.2 M North Of La 1077.

Overall conditionPoor

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

How ratings work
Culvertsets the rating4/9 · Poor
Channelnot part of overall5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT41 FT ACROSS25 FT0ELEVATION · LENGTHS TO SCALE
Culvert 4/9

A culvert 41 ft across with 4 openings. 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, so those are drawn as typical for a culvert.

Built199036 years old
Length41.0 ft12.5 m
Daily traffic2,255counted 2022
Last inspectedNovember 2024every 24 months

Location

StateLouisiana
CountySt. Tammany
Location2.2 M North Of La 1077
CarriesN. Wllie RD
CrossesDrainage Ditch
Coordinates30.60753, -90.21955

Physical Characteristics

MaterialSteel
DesignCulvert
Total Length41.0 ft (12.5 m)
Max Span7.9 ft (2.4 m)
Deck Width80.1 ft (24.4 m)
Deck Area305 sq m
Main Spans4
Year Built1990

Traffic

Avg Daily Traffic2,255 (2022)
Lanes On Bridge2

Inspection & Ownership

Last InspectionNovember 2024
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number625230364901311

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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