Nfa A556 over Riley Creek

Roane County, Tennessee · rated Good in the 2025 National Bridge Inventory

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

• Nfa A556 over Riley Creek in Roane County, Tennessee, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
• Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
• It was built in 1996, making it 29 years old at the 2025 inventory.
• It carries about 840 vehicles a day (traffic count year 2020).
• Its listed owner is the county highway agency.
• It is one of 77 of the 159 inventoried bridges in Roane County rated good (48.4%); 4 (2.5%) are rated poor.
• A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

View this bridge on a map → (35.81088, -84.55241)

Component ratings

Bridge details

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

Busiest bridges in Roane County

All bridges nearby: Roane County, TN bridge conditions · every bridge in Roane County · Tennessee bridges.

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