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Ky-21 over I-75

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

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

Ky-21 over I-75 in Madison County, Kentucky, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 2002, making it 23 years old at the 2025 inventory.
It carries about 13,303 vehicles a day (traffic count year 2022).
Its listed owner is the state highway agency.
It is one of 105 of the 157 inventoried bridges in Madison County rated fair (66.9%); 13 (8.3%) 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	Continuous prestressed concrete stringer or multi-beam girder
Length	about 256 ft
Location	.5 Mi W Jct US 25
NBI structure number	076B00107N
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
I-75 over Ky 52	2002	66,135	Fair
I-75 over Ky 595	2003	64,079	Fair
I-75 over Walnut Meadow Branch	1966	59,929	Fair
I-75 Nc over Ky 169	1999	34,709	Good
I-75 over Ky 169	1999	34,709	Good
I-75 Nc over Silver Creek&menelaus Rd	2003	32,040	Fair