Structure 27015850005 · Gibson County, TN

Nfa 1585 over Overflow

Carries Nfa 1585 over Overflow, 3.4 Mi NE Jct Sr43&sr77.

Overall conditionPoor

Set by its lowest-rated component: Substructure at 4 of 9.

How ratings work
Deck7/9 · Good
Superstructure5/9 · Fair
Substructuresets the rating4/9 · Poor
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT38 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 5/9Substructure 4/9 · sets the rating

38 ft end to end, longest span 19 ft. 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 or the layout of the shorter spans, so those are drawn as typical for a channel-beam bridge.

Built1971rebuilt 1998
Length38.1 ft11.6 m
Daily traffic93counted 2021
Last inspectedSeptember 2023every 24 months

Location

StateTennessee
CountyGibson
Location3.4 Mi NE Jct Sr43&sr77
CarriesNfa 1585
CrossesOverflow
Coordinates35.95806, -88.73797

Physical Characteristics

MaterialConcrete
DesignChannel Beam
Total Length38.1 ft (11.6 m)
Max Span19.0 ft (5.8 m)
Deck Width21.7 ft (6.6 m)
Deck Area76.6 sq m
Main Spans2
Year Built1971 (reconstructed 1998)

Traffic

Avg Daily Traffic93 (2021)
Truck Traffic2%
Lanes On Bridge2

Inspection & Ownership

Last InspectionSeptember 2023
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceHistorical significance is not determined
Scour Critical3 — Scour critical
Structure Number27015850005

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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