78 bridges with vertical clearance data on US-20 in Iowa. Lowest: 135.8ft.
| Clearance | Carries | Crosses | Location | Built | Map |
|---|---|---|---|---|---|
| 135.8ft | Wb Us 20 | Boone River/Rec Trail | 1.2 Mi E Of E Jct Ia 17 | 1974 | Map |
| 145.0ft | Eb Us 20 | Boone River | 1.2 Mi E Of E Jct Ia 17 | 1974 | Map |
| 148.3ft | Eb Us 20 | R-38 | At Junction With Sr R38 | 1975 | Map |
| 149.3ft | Eb Us 20 | Sunnybrook Dr | 1.7 Mi. W Of Ia 12 | 1978 | Map |
| 150.9ft | Us 20 Wb Us 52 Nb | 1St St S | At Jct. Sr Y13 | 1988 | Map |
| 153.2ft | Wb Us 20 | R-38 | At Junction With Sr R38 | 1975 | Map |
| 153.2ft | Eb 20 & Sb 17 | R-27 | 0.8 Mi W Of E Jct Ia 17 | 1978 | Map |
| 153.2ft | Us 20 Eb | T 19 | At Junction With Sr T19 | 2003 | Map |
| 154.2ft | Us 20 Wb | Sr T19 | At Junction With Sr T19 | 2003 | Map |
| 155.8ft | Wb 20 & Nb 17 | R-27 | 0.8 Mi W Of E Jct Ia 17 | 1978 | Map |
| 156.8ft | Wb Us 20 | Sr T55 | At Junction With Sr T55 | 2000 | Map |
| 158.5ft | Wb Us 20 | Sergeant Road | 2.1 Mi. W Of Jct Ia 12 | 1978 | Map |
| 158.5ft | Us 20 Eb | H Avenue | 2.0 Mi. E Of Jct Sr T19 | 2003 | Map |
| 161.7ft | Eb Us 20 | Ia 150 | At Jct.150 | 1978 | Map |
| 161.7ft | Us 20 Eb | Sr T55 | At Junction With Sr T55 | 2000 | Map |
| 161.7ft | Us 20 Eb | D 35 (Elm St) | 3.4 Miles E Of Jct Us 65 | 2003 | Map |
| 163.4ft | Eb Us 20 | I-35 | At Jct Interstate 35 | 1968 | Map |
| 163.4ft | Us 20 Wb | Nb/Wb Ramp I-380 | At East Jct. I-380 | 1980 | Map |
| 165.0ft | Wb Us 20 | Sunnybrook Dr | 1.7 Mi. W Of Ia 12 | 1978 | Map |
| 167.7ft | Wb Us 20 | I-35 | At Jct Interstate 35 | 1968 | Map |
| 167.7ft | Wb Us 20 | Us 169 | At Jct. Us 169 | 1990 | Map |
| 168.3ft | Eb Us 20 | Us 52 Sb | At Jct. Ia 136 | 1987 | Map |
| 168.3ft | Us 20 Eb Us 52 Sb | Y 17 (Epworth) | At Jct. Of Sr Y17 | 1988 | Map |
| 168.3ft | Eb Us 20 | Co Rd S-27 | At Junction With Sr S27 | 1990 | Map |
| 168.3ft | Us 20 Wb | Ia 14 | At Junction With Ia 14 | 2000 | Map |
| 169.3ft | Us 20 Wb | Grundy Rd | At Junction Sr D18 | 2000 | Map |
| 169.9ft | Us 20 Eb | Ia 58 | At The Jct. Iowa #27 & 58 | 1984 | Map |
| 170.9ft | Eb Us 20 | Proposed Rd. | 0.5 Mi W Of Ia 12 | 1978 | Map |
| 170.9ft | Wb Us 20 | Ia 58 | At The Jct. Iowa #27 & 58 | 1984 | Map |
| 171.6ft | Us 20 Eb | Us 65 | At Junction With Us 65 | 2003 | Map |
| 171.6ft | Us 20 Wb | Us 65 | At Junction With Us 65 | 2003 | Map |
| 172.6ft | Us 20 Eb | Nb/Wb Ramp I-380 | At E Jct. I-380 | 1980 | Map |
| 172.6ft | Us 20 Eb Us 52 Sb | 1St St S | At Jct. S.R. Y13 | 1988 | Map |
| 172.6ft | Wb Us 20 | Co Rd S-27 | At Junction With Sr S27 | 1990 | Map |
| 172.6ft | Us 20 Wb | Ia 4 | U.S. 20 Over Ia 4 | 2012 | Map |
| 173.2ft | Wb Us 20 | Proposed Rd. | 0.5 Mi. W Of Ia 12 | 1978 | Map |
| 173.2ft | Us 20 Eb | Ia 4 | Us 20 Over Ia 4 | 2012 | Map |
| 174.2ft | Eb Us 20 | Hess Rd | 0.3 Mi W Of W Jct 380/218 | 1983 | Map |
| 175.9ft | Us 20 Eb | S Fork Catfish Creek | Us 20 & Ia 52 Interchange | 2017 | Map |
| 175.9ft | Us 20 Wb | S Fork Catfish Creek | Us 20 & Ia 52 Interchange | 2018 | Map |
| 175.9ft | Eb Us 20 | Us 169 | At Jct. Us 169 | 1990 | Map |
| 177.5ft | Wb Us 20 | Ia 150 | At Jct. 150 | 1978 | Map |
| 177.5ft | Us 20 Wb Us 52 Nb | Y 17 (Epworth) | At Jct. Of Sr Y17 | 1988 | Map |
| 180.1ft | Us 20 Eb | Grundy Rd | At Junction With Sr D18 | 2000 | Map |
| 181.8ft | Wb 20 | Us 218 | At W Jct. I-380 | 1983 | Map |
| 185.0ft | Wb Us 20 | Hess Rd | 0.3 Mi.W Of W Jct 380/218 | 1983 | Map |
| 185.7ft | Us 20 Wb | H Avenue | 2.0 Miles East Jct Sr T19 | 2003 | Map |
| 188.3ft | Us 20 Eb | Ia 14 | At Junction Ia 14 | 2000 | Map |
| 188.3ft | Us 20 Eb | Us 71 Nb | Us 20 Over Us 71 | 2012 | Map |
| 189.3ft | Eb 20 | Us 218 | At W. Jct. I-380 | 1983 | Map |
| 193.2ft | Us 20 | Ia 376 & Up Rr | At Jct Of Ia. 376 | 1976 | Map |
| 193.2ft | Wb Us 20 | Us 52 Sb | At Jct. Ia 136 | 1987 | Map |
| 194.2ft | Us 20 Wb | 205Th Ave Spring Branch | 2.8 Mi. W Of Jct. Ia 38 | 1973 | Map |
| 195.9ft | Us 20 Eb | 205Th Ave Spring Branch | 2.8 Mi. W Of Jct. Ia 38 | 1973 | Map |
| 195.9ft | Us 20 Wb | D 35 (Elm St) | 3.4 Miles E Of Jct Us 65 | 2003 | Map |
| 197.5ft | Us 20 Wb | Us 71 Nb | Us 20 Over Us 71 | 2012 | Map |
| 200.8ft | Us 20 Wb | Us 71 Sb & Ia 471 | At Jct. Of Us 71 | 2012 | Map |
| 205.1ft | Eb Us 20 | Sergeant Road | 2.1 Mi. W Of Jct. Ia 12 | 1978 | Map |
| 211.6ft | Us 20 Eb | Us 71 Sb & Ia 471 | At Jct. Us 71 | 2012 | Map |
| 217.5ft | U.S. 20 Wb | Iowa River Rr | 0.4 Miles W Of Jct Sr S56 | 2003 | Map |
| 223.4ft | Us 20 Eb | Iowa River Rr | 0.4 Mi West Of Jct Sr S56 | 2003 | Map |
| 234.3ft | Wb Us 20 | Mid Br Catfish Ck Cc Rr | 0.6 Mi. E Of Nw Arterial | 1961 | Map |
| 234.9ft | Eb Us 20 | Over Cc Rr | 0.9 Mi. E Of Jct. Ia 13 | 1971 | Map |
| 234.9ft | Us 20 Eb | Sr D20 & Up Rr | 0.5 Mi E Of Jct Sr D36 | 1990 | Map |
| 234.9ft | Wb Us 20 | Over Up Rr | 1.5 Miles East Of Sr S27 | 1990 | Map |
| 235.9ft | Us 20 Eb | Uprr | 1.5 Miles E Of Jct Sr S27 | 1999 | Map |
| 237.5ft | Us 20 Wb | D 20 & Up Rr | 0.5 Mi E Of Sr D36 | 2008 | Map |
| 238.2ft | Eb Us 20 | Us 63 Sergeant Rd Trail | At Jct. Us 63 | 1983 | Map |
| 239.2ft | Wb Us 20 | Over Abandon Rr | 0.1 Mi E Of Sr D25 | 1978 | Map |
| 240.8ft | Wb Us 20 | Us 63 Sergeant Rd Trail | At Jct. U.S. 63 | 1983 | Map |
| 240.8ft | Us 20 Eb | Cc Rr | 4.0 Mi. E Of Jct. Sr N65 | 2010 | Map |
| 242.5ft | Wb Us 20 | Over Cc Rr | 0.9 Mi. E Of Jct. 13 | 1971 | Map |
| 242.5ft | Us 20 Ramp | Aband Rr | 0.1 Mi. E Of Sr D25 | 1978 | Map |
| 244.1ft | Us 20 Off Ramp | Us 63 | At Jct. U.S. 63 | 1983 | Map |
| 247.4ft | Us 20 Wb | Cc Rr | 4.0 Mi. E Of Jct. Sr N65 | 2011 | Map |
| 257.5ft | Eb Us 20 | Mid Br Catfish Ck Cc Rr | 0.6 Mi. E Of Nw Arterial | 1995 | Map |
| 271.7ft | Us 20 Eb Ia 27 Sb | Ianr Rr,Tx St, Cedar Rvr | 0.4 Mi. S Of Jct. 20 | 1983 | Map |
| 299.2ft | Us 20 | Miss. River, Hwy & Rr | In Dubuque | 1943 | Map |