5 bridges with vertical clearance data on 688 in Virginia. Lowest: 164.0ft.
| Clearance | Carries | Crosses | Location | Built | Map |
|---|---|---|---|---|---|
| 164.0ft | Holland Creek Road | Route 64 Ebl & Wbl | 1.4 From 721 & .75 To 250 | 1970 | Map |
| 218.2ft | Lee Ford Camp Road | Ns Railway | 0.01 Rt 726; 0.02 Rt 220 | 1970 | Map |
| 3277.6ft | Cotton Hill Road | Back Creek | 0.00-Rt221; 0.45-Rt888 | 2013 | Map |
| 3277.6ft | Rose Valley Road | Branch Nottoway River | 0.30 Mi To Int Rte. 684 | 2010 | Map |
| 3277.6ft | Leeds Manor Road | West Branch Thumb Run | 1.20 Fr 635 & .70 To 730 | 2016 | Map |