Structure 33I01240014 · Hamilton County, TN

I124 Sbl over W. 9th St. (fau 3551)

Carries I124 Sbl over W. 9th St. (fau 3551), 3 Mi S Of Tn River.

Overall conditionGood

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

How ratings work
Decksets the rating7/9 · Good
Superstructuresets the rating7/9 · Good
Substructuresets the rating7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT138 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 7/9

138 ft end to end. Lengths and the semi-truck 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.

Built20206 years old
Length138.5 ft42.2 m
Daily traffic—reported figure implausible
Last inspectedAugust 2024every 24 months

Location

StateTennessee
CountyHamilton
Location3 Mi S Of Tn River
CarriesI124 Sbl
CrossesW. 9th St. (fau 3551)
Coordinates35.04650, -85.31418

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length138.5 ft (42.2 m)
Max Span133.2 ft (40.6 m)
Deck Width74.8 ft (22.8 m)
Deck Area962.2 sq m
Main Spans1
Year Built2020

Traffic

Avg Daily Traffic64,726 (2021)
That is about 64,726 vehicles per lane per day — beyond what any U.S. road carries (the busiest freeways run about 25,000–30,000). It is almost certainly a data-entry error in the National Bridge Inventory, so we leave this bridge out of traffic rankings.
Truck Traffic6%
Lanes On Bridge1
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 Number33I01240014

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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