Route I-81 over Rock Branch

Roanoke County, Virginia · rated Fair in the 2025 National Bridge Inventory

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

• Route I-81 over Rock Branch in Roanoke County, Virginia, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
• Its lowest-rated component is the culvert, rated 6 (satisfactory condition) on the 0-9 scale.
• It was built in 1964, making it 61 years old at the 2025 inventory.
• It carries about 56,324 vehicles a day (traffic count year 2022).
• Its listed owner is the state highway agency.
• It is one of 124 of the 207 inventoried bridges in Roanoke County rated fair (59.9%); 1 (0.5%) 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 → (37.27452, -80.13967)

Component ratings

Bridge details

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

Busiest bridges in Roanoke County

All bridges nearby: Roanoke County, VA bridge conditions · every bridge in Roanoke County · Virginia bridges.

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