53 bridges with vertical clearance data on US-421 in North Carolina. Lowest: 144.0ft.
| Clearance | Carries | Crosses | Location | Built | Map |
|---|---|---|---|---|---|
| 144.0ft | Us421 Nbl | Sr1710 | .2 Mi.S.Jct.Sr1146 | 1960 | Map |
| 144.7ft | Us421 Nbl | Us601 | .8 Mi.N.Jct.Sr1150 | 1960 | Map |
| 148.3ft | Us421 Nbl | Us21 | .7 Mi.N.Jct.Sr1137 | 2002 | Map |
| 149.9ft | Us421 Nbl | Sr2402 | .4 Mi.S.Jct.Sr2303 | 2004 | Map |
| 149.9ft | Us421 Sbl | Sr1300 | .6 Mi.N.Jct.Sr1314 | 2005 | Map |
| 151.6ft | Us421 Sbl | Sr2325 | 0.3 Mi.N.Jct.Sr2576 | 2002 | Map |
| 153.2ft | Us421 Ferry | Cape Fear River | 0.2 Mi. W. End. Us421 | 1964 | Map |
| 153.2ft | Us421 Nbl | Sr2309 | .7 Mi.S.Jct.Sr2316 | 2003 | Map |
| 153.2ft | Us421 Sbl | Us601 | 1.14 Mi.N.Jct.Sr1765 | 1991 | Map |
| 154.2ft | Us421 Nbl | Sr1125 | 1.2 Mi. N. Jct. Us21 | 2002 | Map |
| 157.5ft | Us421 Nbl | Sr1300 | .6 Mi.N.Jct.Sr1314 | 2005 | Map |
| 163.1ft | Us421 Nbl | Sr2113 | 1.5 Mi. S. Jct. Sr2110 | 1991 | Map |
| 164.7ft | Us421S | Sr1006 | 1.2 Mi. S. Jct. Nc49 | 1987 | Map |
| 165.7ft | Us421S, Nc87S Byp. | Nc42 | 0.9 Mi. N. Jct. Us421Bus. | 2007 | Map |
| 166.7ft | Us421S,Nc87S | Us421 Bus | 1.0 Mi. S. Jct. Nc42 | 2013 | Map |
| 167.3ft | Us421Nb,Nc87N Byp. | Nc42 | .09 Mi. N. Jct. Us421 Bus | 2007 | Map |
| 168.0ft | Us421S | Sr2110 | 1.3 Mi. S. Jct. Us64 | 1982 | Map |
| 168.0ft | Us421 Sbl | Sr1125 | 1.2 Mi. N. Jct. Us21 | 2002 | Map |
| 168.3ft | Us421Nbl | Sr2325 | 0.3Mi.N.Jct.Sr2576 | 2003 | Map |
| 169.0ft | Us421 Sbl | Us21 | .7 Mi.N.Jct.Sr1137 | 2002 | Map |
| 171.6ft | Us421 Sbl | I40 Bus Wbl | 0.6 Mi. S. Jct. Sr1122 | 1992 | Map |
| 171.6ft | Us421N | Nc24 | 1.2 Mi. N. Jct. Sr1227 | 2021 | Map |
| 173.2ft | Us421 Nbl Byp. | Nc268 | .2 Mi.S.Jct.Sr1198 | 2003 | Map |
| 174.9ft | Us421S | Nc24 | 1.2 Mi. N. Jct. Sr1227 | 2022 | Map |
| 176.5ft | Us421,Nc87 Sbl Col | Us1,Us15/501,Nc87 Bus | 0.45 Mi N Jct Us1Bus | 2007 | Map |
| 179.1ft | Us421 Sbl | Sr2309 | .7 Mi.S.Jct.2316 | 2003 | Map |
| 181.4ft | Us 421S.Ramp | Winston Salem Northern B | .4 Mi.S.Jct.Us.421 N Ramp | 2014 | Map |
| 182.4ft | Col.Ramp To Us421 | Us 421 | 0,7Mi.N.Jct. Us421 Ramp | 2019 | Map |
| 182.7ft | Us421 Sbl Ramp | I40, I40 Bus,Us421 | 1.2 Mi. N. Jct. Us158 | 1990 | Map |
| 186.7ft | Us421 Byp Sbl | Nc 268 | .7 Mi.N.Jct.Nc16 | 2004 | Map |
| 186.7ft | Us421 Sbl | Sr1710 | .2 Mi.S.Jct.Sr1146 | 1991 | Map |
| 187.3ft | Us421 Sbl | Sr2402 | .4 Mi.S.Jct.Sr2303 | 2004 | Map |
| 189.0ft | Us421N | Sr2110 | 1.3 Mi. S. Jct. Us64 | 1982 | Map |
| 190.0ft | Us421N | Sr1006 | 1.2 Mi. S. Jct. Nc49 | 1987 | Map |
| 191.6ft | Us421,Nc87N | Us421S&Us421N,Bus | 1.0 Mi. S. Jct. Nc42 | 2013 | Map |
| 197.2ft | Us421S | Us1 | 1.1 Mi. N. Jct. Sr1415 | 2007 | Map |
| 214.9ft | Us421 Nbl | Dunn Erwin Rail Trail | 0.9 Mi.S.Jct.Nc55 | 1957 | Map |
| 219.8ft | Us421S, Nc55 | Dunn-Erwin Rail Trail | 0.1 Mi. N. Of Jct. Sr1703 | 1957 | Map |
| 224.1ft | Us421N | Southern Railway | .2 Mi. S. Jct. Sr2195 | 1957 | Map |
| 224.1ft | Us421S | Southern Railway | 0.1 Mi. N. Jct.Sr1006 | 1973 | Map |
| 224.1ft | Us421B,Nc115 | Sr2333,Yadkin Rvr.,So.Rr | .1 Mi.S.Jct.Nc18 | 1991 | Map |
| 226.4ft | Us421N,Nc87 | Us1 | 1.1Mi.N.Jct.Sr1415 | 2007 | Map |
| 230.0ft | Us421N | Norfolk Southern Rr | 0.3 Mi. N. Jct. Sr1007 | 1957 | Map |
| 230.0ft | Us421,Nc87N.Byp | A & W Railroad | 1.65 Mi. S. Of Jct Sr1400 | 2015 | Map |
| 233.3ft | Us421S | Southern Railway | 0.2 Mi. S. Jct. Sr2195 | 2008 | Map |
| 236.5ft | Us421, Nc87N | Csxrr, Little Buffalo Cr | 0.4 Mi.S. Jct. Us1 Bus. | 2005 | Map |
| 239.8ft | Us421(Fut) Nbl Col | Us1 | 1.1 Mi. N. Jct.Sr1415 | 2007 | Map |
| 240.5ft | Us421,Nc87S.Byp | Csxrr, Little Buffalo Ck | 0.4 Mi. S. Jct. Us1 Bus | 2005 | Map |
| 244.1ft | Us421S | Norfolk Southern Rr | 0.3 Mi. N. Jct. Sr1007 | 2008 | Map |
| 244.1ft | Us421N | Southern Railway | 0.1 Mi.N. Jct.Sr1006 | 1973 | Map |
| 247.4ft | Us421,Nc87S.Byp | A & W Railroad | 1.65 Mi S. Jct Sr1400 | 2015 | Map |
| 322.2ft | Us421 | Spencer Farlow Dr, Snows | 6.0 Mi. S. Jct. Nc 132 | 1962 | Map |
| 347.4ft | Us421 S.Ramp | I-40/Us 421 | 0.2 Mi.S.Jct.Us421 N.Ramp | 2020 | Map |