Structure 47S24100005 · Knox County, TN

Nfa 1256 (sa 4716) over Knob Fork Creek

Carries Nfa 1256 (sa 4716) over Knob Fork Creek, Central Ave-e Of I75.

Overall conditionGood

Set by its lowest-rated component: Culvert at 8 of 9.

How ratings work
Culvertsets the rating8/9 · Very Good
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT70 FT ACROSS25 FT0ELEVATION · LENGTHS TO SCALE
Culvert 8/9

A culvert 70 ft across with 3 openings. 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, so those are drawn as typical for a culvert.

Built200620 years old
Length69.9 ft21.3 m
Daily traffic8,099counted 2021
Last inspectedJune 2024every 24 months

Location

StateTennessee
CountyKnox
LocationCentral Ave-e Of I75
CarriesNfa 1256 (sa 4716)
CrossesKnob Fork Creek
Coordinates36.02542, -83.99097

Physical Characteristics

MaterialConcrete Continuous
DesignCulvert
Total Length69.9 ft (21.3 m)
Max Span22.6 ft (6.9 m)
Deck Width59.4 ft (18.1 m)
Deck Area385.5 sq m
Main Spans3
Year Built2006

Traffic

Avg Daily Traffic8,099 (2021)
Truck Traffic4%
Lanes On Bridge3

Inspection & Ownership

Last InspectionJune 2024
Inspection FrequencyEvery 24 months
OwnerCity/Municipal Highway Agency
Historical SignificanceHistorical significance is not determined
Scour Critical8 — Stable, low risk
Structure Number47S24100005

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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