Structure 23630000900181 · Orleans County, LA

Alvar ST over Almonaster L&n Railroad

Carries Alvar ST over Almonaster L&n Railroad, 0.1 Mi. S. Of Downman RD.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure7/9 · Good
Substructure7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT1,163 FT OVERALL250 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 7/9Substructure 7/9

1,163 ft end to end, longest span 120 ft: about 3.2 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 girder bridge.

Built197848 years old
Length1163.1 ft354.5 m
Last inspectedApril 2023every 24 months

Location

StateLouisiana
CountyOrleans
Location0.1 Mi. S. Of Downman RD
CarriesAlvar ST
CrossesAlmonaster L&n Railroad
Coordinates30.00185, -90.03008

Physical Characteristics

MaterialSteel
DesignGirder and Floorbeam
Total Length1163.1 ft (354.5 m)
Max Span120.1 ft (36.6 m)
Deck Width70.5 ft (21.5 m)
Deck Area7621.8 sq m
Main Spans3
Year Built1978

Traffic

Lanes On Bridge2
Lanes Under Bridge6

Inspection & Ownership

Last InspectionApril 2023
Inspection FrequencyEvery 24 months
OwnerCity/Municipal Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number023630000900181

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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