Structure 39B00023R · Gallatin County, KY

I-71 over Ky47

Carries I-71 over Ky47, Nbl @ Carroll Co.ln..

Overall conditionFair

Set by its lowest-rated component: Substructure at 5 of 9.

How ratings work
Deck6/9 · Satisfactory
Superstructure6/9 · Satisfactory
Substructuresets the rating5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT155 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 6/9Substructure 5/9 · sets the rating

155 ft end to end, longest span 52 ft: about 2 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 tee-beam bridge.

Built196759 years old
Length154.9 ft47.2 m
Daily traffic17,812counted 2023
Last inspectedJuly 2023every 24 months

Location

StateKentucky
CountyGallatin
LocationNbl @ Carroll Co.ln.
CarriesI-71
CrossesKy47
Coordinates38.68222, -84.96389

Physical Characteristics

MaterialConcrete
DesignTee Beam
Total Length154.9 ft (47.2 m)
Max Span51.8 ft (15.8 m)
Deck Width41.7 ft (12.7 m)
Deck Area599.4 sq m
Main Spans3
Year Built1967

Traffic

Avg Daily Traffic17,812 (2023)
Truck Traffic35%
Lanes On Bridge2
Lanes Under Bridge2

Inspection & Ownership

Last InspectionJuly 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is possibly eligible (requires evaluation)
Scour CriticalNot applicable
Structure Number039B00023R

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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