Structure 33I01240011 · Hamilton County, TN

I124 Nbl over W.12th ST (nfa 410)

Carries I124 Nbl over W.12th ST (nfa 410), 4.2 Mi S Of Tn River.

Overall conditionGood

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

How ratings work
Deck8/9 · Very Good
Superstructure8/9 · Very Good
Substructuresets the rating7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT74 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 8/9Superstructure 8/9Substructure 7/9 · sets the rating

74 ft end to end. 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.

Built20188 years old
Length74.1 ft22.6 m
Daily traffic64,726counted 2021
Last inspectedAugust 2024every 24 months

Location

StateTennessee
CountyHamilton
Location4.2 Mi S Of Tn River
CarriesI124 Nbl
CrossesW.12th ST (nfa 410)
Coordinates35.04275, -85.31420

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length74.1 ft (22.6 m)
Max Span70.2 ft (21.4 m)
Deck Width73.8 ft (22.5 m)
Deck Area508.5 sq m
Main Spans1
Year Built2018

Traffic

Avg Daily Traffic64,726 (2021)
Truck Traffic6%
Lanes On Bridge3
Lanes Under Bridge2

Inspection & Ownership

Last InspectionAugust 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceHistorical significance is not determined
Scour CriticalNot applicable
Structure Number33I01240011

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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