Structure 57I00400045 · Madison County, TN

Nfa A186 over Nfa A186/i40

Carries Nfa A186 over Nfa A186/i40, 2.2 Mi NE Jct Sr1&sr20.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructure7/9 · Good
Substructuresets the rating6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT275 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 6/9 · sets the rating

275 ft end to end, longest span 82 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 tee-beam bridge.

Built196462 years old
Length274.9 ft83.8 m
Daily traffic50counted 2020
Last inspectedApril 2023every 24 months

Location

StateTennessee
CountyMadison
Location2.2 Mi NE Jct Sr1&sr20
CarriesNfa A186
CrossesNfa A186/i40
Coordinates35.69456, -88.70039

Physical Characteristics

MaterialConcrete Continuous
DesignTee Beam
Total Length274.9 ft (83.8 m)
Max Span82.0 ft (25 m)
Deck Width27.9 ft (8.5 m)
Deck Area712.3 sq m
Main Spans4
Year Built1964

Traffic

Avg Daily Traffic50 (2020)
Truck Traffic4%
Lanes On Bridge2
Lanes Under Bridge4

Inspection & Ownership

Last InspectionApril 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceHistorical significance is not determined
Scour CriticalNot applicable
Structure Number57I00400045

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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