Structure 18F00050001 · Cumberland County, TN

Nfa 1170 (sa 1816) over Black Drowning Creek

Carries Nfa 1170 (sa 1816) over Black Drowning Creek, South Of I40.

Overall conditionGood

Set by its lowest-rated component: Culvert at 7 of 9.

How ratings work
Culvertsets the rating7/9 · Good
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT56 FT ACROSS25 FT0ELEVATION · LENGTHS TO SCALE
Culvert 7/9

A culvert 56 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.

Built200026 years old
Length56.4 ft17.2 m
Daily traffic431counted 2021
Last inspectedMay 2024every 24 months

Location

StateTennessee
CountyCumberland
LocationSouth Of I40
CarriesNfa 1170 (sa 1816)
CrossesBlack Drowning Creek
Coordinates36.01327, -85.06956

Physical Characteristics

MaterialConcrete Continuous
DesignCulvert
Total Length56.4 ft (17.2 m)
Max Span15.1 ft (4.6 m)
Deck Width33.5 ft (10.2 m)
Deck Area175.4 sq m
Main Spans3
Year Built2000

Traffic

Avg Daily Traffic431 (2021)
Truck Traffic3%
Lanes On Bridge2

Inspection & Ownership

Last InspectionMay 2024
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number18F00050001

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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