Structure 74I00240003 · Robertson County, TN

Nfa 979 (sa 7401) over I24

Carries Nfa 979 (sa 7401) over I24, 1.3 Mi NW Jct I24&sr256.

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 FT297 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 7/9

297 ft end to end, longest span 116 ft: about 4 semi-trucks nose to tail. 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 box-beam bridge.

Built197353 years old
Length296.9 ft90.5 m
Daily traffic326counted 2021
Last inspectedMarch 2024every 24 months

Location

StateTennessee
CountyRobertson
Location1.3 Mi NW Jct I24&sr256
CarriesNfa 979 (sa 7401)
CrossesI24
Coordinates36.46138, -87.11712

Physical Characteristics

MaterialConcrete Continuous
DesignBox Beam - Multiple
Total Length296.9 ft (90.5 m)
Max Span116.1 ft (35.4 m)
Deck Width32.2 ft (9.8 m)
Deck Area886.9 sq m
Main Spans3
Year Built1973

Traffic

Avg Daily Traffic326 (2021)
Truck Traffic3%
Lanes On Bridge2
Lanes Under Bridge4

Inspection & Ownership

Last InspectionMarch 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceHistorical significance is not determined
Scour CriticalNot applicable
Structure Number74I00240003

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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