Structure 17720 · Smyth County, VA
Carries Lyons Gap Ave. over Carlock Creek, .5 To R637 & .05 To R731.
Set by its lowest-rated component: Deck and Superstructure and Substructure at 6 of 9.
How ratings work24 ft end to end. Lengths are drawn to scale; at this length a semi-truck would be a speck. Each part is colored by its latest inspection rating. The inventory records lengths but not heights or the layout of the shorter spans, so those are drawn as typical for a slab bridge.
| State | Virginia |
| County | Smyth |
| Location | .5 To R637 & .05 To R731 |
| Carries | Lyons Gap Ave. |
| Crosses | Carlock Creek |
| Coordinates | 36.80897, -81.67390 |
| Material | Concrete |
| Design | Slab |
| Total Length | 24.0 ft (7.3 m) |
| Max Span | 21.0 ft (6.4 m) |
| Deck Width | 30.8 ft (9.4 m) |
| Deck Area | 68.6 sq m |
| Main Spans | 1 |
| Year Built | 1930 (reconstructed 1981) |
| Avg Daily Traffic | 1,831 (2022) |
| Truck Traffic | 1% |
| Lanes On Bridge | 2 |
| Last Inspection | November 2024 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 5 — Stable for scour |
| Structure Number | 000000000017720 |
Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."
A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.