Home › Kentucky › Trimble County › US 421 over Little Kentucky River

US 421 over Little Kentucky River

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

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

US 421 over Little Kentucky River in Trimble 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 5 (fair condition) on the 0-9 scale.
It was built in 1982, making it 43 years old at the 2025 inventory.
It carries about 2,170 vehicles a day (traffic count year 2021).
Its listed owner is the state highway agency.
It is one of 39 of the 46 inventoried bridges in Trimble County rated fair (84.8%); 4 (8.7%) 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 single box beam
Length	about 228 ft
Location	0.15 Mi N of Ky 316
NBI structure number	112B00023N
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
US 421 over Ohio River	2014	8,975	Fair
US 421 Escape Ramp over Tiber Creek	1989	5,533	Fair
Ky 36 over Canip Creek	1933	3,978	Poor
US 421 over Town Branch	1984	2,170	Fair
US 421 over Trib to Town Branch	1984	2,170	Good
US 42 over Trib to Little Ky River	1931	1,493	Fair