Structure SA6800000000012 · Tallahatchie County, MS

Allison Road over Tippo Bayou

Carries Allison Road over Tippo Bayou, Sec 14 T23n R 1e.

Overall conditionPoor

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

How ratings work
Deck6/9 · Satisfactory
Superstructure6/9 · Satisfactory
Substructuresets the rating2/9 · Critical
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT207 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 6/9Substructure 2/9 · sets the rating

207 ft end to end, longest span 21 ft: about 3 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.

Built198739 years old
Length207.0 ft63.1 m
Daily traffic40counted 2015
Last inspectedSeptember 2024every 12 months

Location

StateMississippi
CountyTallahatchie
LocationSec 14 T23n R 1e
CarriesAllison Road
CrossesTippo Bayou
Coordinates33.86028, -90.16947

Physical Characteristics

MaterialWood or Timber
DesignStringer/Multi-beam
Total Length207.0 ft (63.1 m)
Max Span21.0 ft (6.4 m)
Deck Width16.1 ft (4.9 m)
Deck Area309.2 sq m
Main Spans11
Year Built1987

Traffic

Avg Daily Traffic40 (2015)
Lanes On Bridge1

Inspection & Ownership

Last InspectionSeptember 2024
Inspection FrequencyEvery 12 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalUnknown
Structure NumberSA6800000000012

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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