10 bridges with vertical clearance data on 646 in Virginia. Lowest: 163.1ft.
| Clearance | Carries | Crosses | Location | Built | Map |
|---|---|---|---|---|---|
| 163.1ft | Hickory Hill Road | Nbl Route I-95 | 0.45 To 641 & .50 To 793 | 1982 | Map |
| 164.7ft | Hickory Hill Road | Sbl Route I-95 | .40 Fr 641 & .55 To 793 W | 1982 | Map |
| 164.7ft | Mt Hebron Rd | I-81 | 1.80 To 623 - 0.10 To 757 | 1965 | Map |
| 164.7ft | Middle Road | Interstate-295 | 0.80 Fr 630 & 0.64 To 647 | 1991 | Map |
| 167.3ft | Prestwood Road | Route I-85 (Nbl) | 1.59 Fr 634 & 0.98 To 1 | 1969 | Map |
| 167.3ft | Prestwood Road | Route I-85 (Sbl) | 1.67 Fr 634 & 0.93 To 1 | 1969 | Map |
| 233.3ft | Aden Road | Norfolk Southern Rr | 00.98Fr652 00.06To772 | 2016 | Map |
| 233.3ft | Aden Road | Ns Railway | 00.05Fr772/00.30To671 | 1882 | Map |
| 238.2ft | Spring Mill Road | Ns Railway | 0.20-Rt 24 /0 .12-Rt 721 | 1975 | Map |
| 3277.6ft | Hardware Road | Hardware River | 3.08 - Rte 6 & 0.20- D.E. | 2010 | Map |