Structure 11000550821271A · Yazoo County, MS

I 55 over Relief Slough

Carries I 55 over Relief Slough, 0.2 Mi N Madison Cl.

Overall conditionFair

Set by its lowest-rated component: Deck at 5 of 9.

How ratings work
Decksets the rating5/9 · Fair
Superstructure8/9 · Very Good
Substructure6/9 · Satisfactory
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT280 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9 · sets the ratingSuperstructure 8/9Substructure 6/9

280 ft end to end, longest span 40 ft: about 4 semi-trucks nose to tail. 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 multi-beam bridge.

Built196957 years old
Length279.9 ft85.3 m
Daily traffic10,000counted 2023
Last inspectedJune 2024every 24 months

Location

StateMississippi
CountyYazoo
Location0.2 Mi N Madison Cl
CarriesI 55
CrossesRelief Slough
Coordinates32.73799, -90.05311

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length279.9 ft (85.3 m)
Max Span40.0 ft (12.2 m)
Deck Width44.0 ft (13.4 m)
Deck Area1143.0 sq m
Main Spans7
Year Built1969

Traffic

Avg Daily Traffic10,000 (2023)
Truck Traffic24%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJune 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number11000550821271A

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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