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US-42 over Big South Fork

Gallatin County, Kentucky · rated Fair in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

US-42 over Big South Fork in Gallatin County, Kentucky, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1980, making it 45 years old at the 2025 inventory.
It carries about 4,209 vehicles a day (traffic count year 2021).
Its listed owner is the state highway agency.
It is one of 41 of the 55 inventoried bridges in Gallatin County rated fair (74.5%); 2 (3.6%) are rated poor.
A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.

Component ratings


Structure	Prestressed concrete stringer or multi-beam girder
Length	about 87 ft
Location	.35 Mi S.W. of Boone Cl
NBI structure number	039B00033N
Condition class	Fair

Source: FHWA National Bridge Inventory, 2025 data as reported by the Kentucky department of transportation.

Bridge	Built	Vehicles/day	Condition
I-71 over Big South Fork Creek	1967	37,745	Good
I-71 over Ky 35	2007	37,308	Good
I-71 over KY3002	1967	18,873	Fair
I-71 over KY3002	1967	18,873	Fair
I-71 over Little Sugar Road	1967	18,873	Fair
I-71 over Little Sugar Road	1967	18,873	Fair