Structure 150A4630001 · Cocke County, TN

Nfa A463 over Cosby Creek

Carries Nfa A463 over Cosby Creek, W Off Sr32-4 M N Of Cosby.

Overall conditionPoor

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

How ratings work
Deck5/9 · Fair
Superstructuresets the rating4/9 · Poor
Substructure5/9 · Fair
Channelnot part of overall5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT60 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9Superstructure 4/9 · sets the ratingSubstructure 5/9

60 ft end to end, longest span 20 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 multi-beam bridge.

Built197056 years old
Length59.7 ft18.2 m
Daily traffic80counted 2020
Last inspectedOctober 2024every 24 months

Location

StateTennessee
CountyCocke
LocationW Off Sr32-4 M N Of Cosby
CarriesNfa A463
CrossesCosby Creek
Coordinates35.85462, -83.21910

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length59.7 ft (18.2 m)
Max Span20.0 ft (6.1 m)
Deck Width16.1 ft (4.9 m)
Deck Area89.2 sq m
Main Spans3
Year Built1970

Traffic

Avg Daily Traffic80 (2020)
Truck Traffic2%
Lanes On Bridge1

Inspection & Ownership

Last InspectionOctober 2024
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceHistorical significance is not determined
Scour Critical4 — Foundations need monitoring
Structure Number150A4630001

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.

Nearby Bridges