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Nfa 1179 (sa 1408) over Knob Creek

Clay County, Tennessee · rated Fair in the 2025 National Bridge Inventory

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

Nfa 1179 (sa 1408) over Knob Creek in Clay County, Tennessee, 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 1976, making it 49 years old at the 2025 inventory.
It carries about 461 vehicles a day (traffic count year 2021).
Its listed owner is the county highway agency.
It is one of 51 of the 64 inventoried bridges in Clay County rated fair (79.7%); 3 (4.7%) 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 stringer or multi-beam girder
Length	about 185 ft
Location	3 Mi S of SR-52
NBI structure number	14S42320001
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
Fap 52 over Cumberland River	1988	6,000	Fair
Fap 52 over Overflow & Kyle St (A290	1987	6,000	Fair
Fap 52 over Wet Weather Branch	2013	3,949	Good
Fap 52 over Wet Weather Branch	2013	3,949	Good
Fap 52 over SR-52 / Wet Mill CR. Rd.	2013	3,949	Fair
Fap 52 over SR-52 / Wet Mill CR. Rd.	2013	3,949	Fair