Structure 11000550430463A · Lincoln County, MS

I 55 over Slough

Carries I 55 over Slough, 8.4 Mi N US 84.

Overall conditionFair

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

How ratings work
Culvertsets the rating6/9 · Satisfactory
Channelnot part of overall5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT50 FT ACROSS25 FT0ELEVATION · LENGTHS TO SCALE
Culvert 6/9

A culvert 50 ft across with 2 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.

Built196660 years old
Length49.9 ft15.2 m
Daily traffic10,500counted 2023
Last inspectedFebruary 2025every 24 months

Location

StateMississippi
CountyLincoln
Location8.4 Mi N US 84
CarriesI 55
CrossesSlough
Coordinates31.66802, -90.45684

Physical Characteristics

MaterialConcrete
DesignCulvert
Total Length49.9 ft (15.2 m)
Max Span20.0 ft (6.1 m)
Deck Area203.7 sq m
Main Spans2
Year Built1966

Traffic

Avg Daily Traffic10,500 (2023)
Truck Traffic30%
Lanes On Bridge20

Inspection & Ownership

Last InspectionFebruary 2025
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number11000550430463A

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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