I-81 Sbl over Route 8
Montgomery County, Virginia · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- I-81 Sbl over Route 8 in Montgomery County, Virginia, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 8 (very good condition) on the 0-9 scale.
- It was built in 2019, making it 6 years old at the 2025 inventory.
- It carries about 25,152 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 87 of the 196 inventoried bridges in Montgomery County rated good (44.4%); 5 (2.6%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated October 2024, on a 24-month routine inspection cycle.
- 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 → (37.11619, -80.42299)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 8 | 8 | Very good condition |
| Superstructure | 8 | 8 | Very good condition |
| Substructure | 8 | 8 | Very good condition |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 147 ft |
| Location | 5.13rt-177; 4.05rt-460 |
| NBI structure number | 000000000030365 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | October 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | N: not over a waterway |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Virginia department of transportation.
Busiest bridges in Montgomery County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| 81 over Br. N Fork Roanoke River | 1968 | 53,173 | Fair |
| RTE 0460/By-Pass over Va Tech Pvt Rd | 1994 | 40,932 | Good |
| 460 Ramp A over 460 Ramps C & D | 2003 | 37,000 | Good |
| Rte. 460/BY-PASS over Smithfield Road | 1994 | 36,455 | Fair |
| Nbl Route 0081 over NS Railway & Rte 641 | 1970 | 27,266 | Fair |
| 81 Nbl over 11/460 Roanoke Rd | 2001 | 27,266 | Good |
All bridges nearby: Montgomery County, VA bridge conditions · every bridge in Montgomery County · Virginia bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.