Nfa 4748 (sa 9423) over Overflow W. Harpeth Riv.

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

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

• Nfa 4748 (sa 9423) over Overflow W. Harpeth Riv. in Williamson County, Tennessee, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
• Its lowest-rated component is the superstructure, rated 5 (fair condition) on the 0-9 scale.
• It was built in 1999, making it 26 years old at the 2025 inventory.
• It carries about 2,592 vehicles a day (traffic count year 2021).
• Its listed owner is the county highway agency.
• It is one of 174 of the 531 inventoried bridges in Williamson County rated fair (32.8%); 16 (3.0%) 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.

View this bridge on a map → (35.96603, -86.9192)

Component ratings

Bridge details

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

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Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.