6 bridges with vertical clearance data on 21 in Arkansas. Lowest: 159.4ft.
| Clearance | Carries | Crosses | Location | Built | Map |
|---|---|---|---|---|---|
| 159.4ft | Co Rd 21 | I-30 Eb Log 87.32 | Eb I 30 Lm 87.32 | 1966 | Map |
| 160.8ft | C.R. 21 -E- 2.47 | I 30-Sec 12,Lm 28.19 | Jct I-30 & Co.Rd. 21 | 1967 | Map |
| 161.7ft | Bankhead Drive | I440,Lr Port,Rr,Fourche | I-440 Log 3.24 Airport Ex | 1976 | Map |
| 164.0ft | Co Rd 21 | I-30 Wb Log 87.32 | I-30 Wb Log 87.32 | 1966 | Map |
| 3277.6ft | Cr 21/Burton Rd | North Clear Creek | 0.4 Mi S Bowserrd-Mntcell | 2004 | Map |
| 3277.6ft | Sulphur Springs Rd | Creek | 3 Miles North Of Sh 8 | 2016 | Map |