Structure 35100050100001 · St. Mary County, LA

La0182 over Atchaf.r/berwick Bay

Carries La0182 over Atchaf.r/berwick Bay, 1.4 Mi West Of US 90.

Overall conditionPoor

Set by its lowest-rated component: Substructure at 2 of 9.

How ratings work
Deck5/9 · Fair
Superstructure5/9 · Fair
Substructuresets the rating2/9 · Critical
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT3,746 FT OVERALL500 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9Superstructure 5/9Substructure 2/9 · sets the rating

3,746 ft end to end, longest span 608 ft: about 10 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 through truss.

Built193393 years old
Length3746.1 ft1141.8 m
Daily traffic12,788counted 2021
Last inspectedMarch 2024every 12 months

Location

StateLouisiana
CountySt. Mary
Location1.4 Mi West Of US 90
CarriesLa0182
CrossesAtchaf.r/berwick Bay
Coordinates29.69443, -91.21981

Physical Characteristics

MaterialSteel
DesignTruss - Thru
Total Length3746.1 ft (1141.8 m)
Max Span607.9 ft (185.3 m)
Deck Width29.5 ft (9 m)
Deck Area10276.2 sq m
Main Spans3
Year Built1933

Traffic

Avg Daily Traffic12,788 (2021)
Truck Traffic9%
Lanes On Bridge2

Inspection & Ownership

Last InspectionMarch 2024
Inspection FrequencyEvery 12 months
OwnerState Highway Agency
Historical SignificanceBridge is eligible for the National Register
Scour Critical2 — Bridge closed (monitoring)
Structure Number035100050100001

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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