Longest Bridges in Iowa

The longest bridge in Iowa spans 5759.8 feet. The table below ranks the state's bridges by total structure length — from major river crossings and causeway spans to long highway overpasses.

How this ranking works

Length comes from the NBI structure length field and is shown in feet. It is best read as a scale and maintenance-complexity signal, not by itself as a safety signal.

Bridge	County	Length	Condition	Year Built
US 20 over Miss. River HWY & Rr	Dubuque	5759.8 ft	Fair	1943
Ia 14 over Des Moines River & Res	Marion	5652.9 ft	Fair	1965
Ia 415 over Saylorville Reservoir	Polk	4933.1 ft	Fair	1973
US 275 & Ia 92 over Missouri River And Rr	Pottawattamie	4296.9 ft	Good	2010
I-280 over Mississippi River & Road	Scott	4192.9 ft	Fair	1970
US 30 over Mississippi Rvr Rr S 2nd	Clinton	4165.0 ft	Fair	1956
US 61 & 151 over Peosta Chl & City ST	Dubuque	4029.9 ft	Fair	1991
Ia 12 over Bnsf Rvr Sts & Ia 376	Woodbury	3970.1 ft	Poor	1936
US 67 over Miss Rvr Rr & Ia 461	Scott	3854.0 ft	Poor	1940
I 80 WB Flyover over I80 US 6 I29 & Bnsf Iir	Pottawattamie	3678.1 ft	Good	2017
I-80 over Mississippi River & Rr	Scott	3487.9 ft	Fair	1967
I 74 EB over Mississippi River	Scott	3396.0 ft	Good	2021
I 74 WB over Mississippi River	Scott	3386.2 ft	Good	2020
I 80 WB US 6 WB over I29 Rr Langdon BLVD	Pottawattamie	3357.9 ft	Good	2017
US 136 over Mississippi River Rr RD	Lee	3346.1 ft	Fair	1985
I 80 US 6 EB over I29 Rr Harrylangdon BLVD	Pottawattamie	3336.9 ft	Good	2019
US 34 over Missouri River	Mills	3282.2 ft	Good	2014
Ia 92 over Mississippi River & Rr	Muscatine	3018.0 ft	Fair	1972
Ia 136 over Mississippi River & Rr	Clinton	3012.1 ft	Fair	1974
US 61 & 151 over Mississippi River Island	Dubuque	2950.1 ft	Fair	1982
SB Ia 27 over Cedar River & Rr	Black Hawk	2861.9 ft	Good	1995
NB Ia 27 over Cedar River & Ia North R	Black Hawk	2860.9 ft	Good	1995
I80 EB To I380 NB over I 80/us 218/ia 27	Johnson	2771.0 ft	Good	2020
South Expressway over Viaduct(rr & Streets)	Pottawattamie	2649.0 ft	Poor	1976
South Expressway over Viaduct Over Rr & Street	Pottawattamie	2649.0 ft	Fair	1976
I 29 SB To I 80 EB over I 29 & Cbec Rr	Pottawattamie	2645.7 ft	Good	2019
I 129 over Missouri River & I-29	Woodbury	2607.0 ft	Fair	1976
US 18 over Mississippi River Ia 76	Clayton	2561.0 ft	Fair	1974
I 80 WB over Missouri Rvr RD Rr	Pottawattamie	2482.9 ft	Good	2010
I-80 EB over Missouri River RD & Rr	Pottawattamie	2467.8 ft	Fair	1972
US 52 & Ia 64 over Mississippi River	Jackson	2454.1 ft	Good	2017
Ia 141 Fly Over over I 35/80 Ia 141 & Rr	Polk	2385.5 ft	Good	2019
Ia 149 over Dm River Streets Bnsf Rr	Wapello	2318.9 ft	Fair	1964
I 380 SB over Ia 922	Linn	2295.9 ft	Fair	1979
I 74 & US 6 WB over US 67 Dme Rr City Sts	Scott	2279.5 ft	Good	2019
I 74 EB US 6 EB over US 67 Rr City Streets	Scott	2271.7 ft	Good	2021
US 34 over Mississippi River	Des Moines	2270.0 ft	Fair	1994
I 29 SB over I-80 & I-29 Interchange	Pottawattamie	2173.9 ft	Good	2014
I 380 NB over Ia 922	Linn	2171.9 ft	Fair	1979
Ia 316 over Des Moines River	Polk	2139.1 ft	Fair	1968
I-480 Ramp H over I 29 2 AVE EB Bdwy Frt R	Pottawattamie	2100.1 ft	Good	2023
Jefferson ST over Des Moines Rvr & Rr	Wapello	2080.1 ft	Fair	1936
I 80 EB To I 29 NB over I80 & I29 Interchange	Pottawattamie	1985.9 ft	Good	2014
US 30 over Missouri River	Harrison	1982.9 ft	Fair	1991
Bunge AVE over Missouri River (toll)	Mills	1969.2 ft	Fair	1952
Ia 175 over Missouri River	Monona	1956.0 ft	Fair	1950
Ia 2 over Missouri River	Fremont	1895.0 ft	Good	1986
Ia 100 over Cedar River & Ianr Rr	Linn	1885.2 ft	Good	2016
NB I-380 over Cc Rr & Ash Pit	Linn	1763.1 ft	Fair	1979
SB I-380 over Cc Rr & Ash Pit	Linn	1763.1 ft	Fair	1979
WB I-680 over Missouri River & City ST	Pottawattamie	1711.0 ft	Fair	1975
I 35 Fly Over Ramp over I 35 & US 30	Story	1699.1 ft	Good	2019
I480 EB To I29 NB over I 29 US 6 AVE G	Pottawattamie	1688.0 ft	Good	2022
I-480 & US 6 over Missouri River & Rr	Pottawattamie	1687.0 ft	Fair	1966
US 20 over Iowa River	Hardin	1639.1 ft	Good	2003
Ia 9 over Mississippi River	Allamakee	1629.9 ft	Poor	1931
So Center ST over Rr And Madison ST	Marshall	1604.0 ft	Poor	1951
EB I-680 over Missouri River & City ST	Pottawattamie	1603.0 ft	Fair	1952
W Broadway over Up&cnic Rr&city Streets	Pottawattamie	1543.0 ft	Fair	2011
US 20 EB Ia 27 SB over Ianr Rr Tx ST Cedar Rvr	Black Hawk	1540.0 ft	Fair	1983
I 380 NB over Ianr Rr Tx ST Cedar Rvr	Black Hawk	1526.9 ft	Fair	1983
SW 8th ST over Rr Cherry Mlk Jr PKWY	Polk	1515.1 ft	Poor	1967
US 77 over Missouri River & RD	Woodbury	1502.0 ft	Fair	1981
I380 SB Flyover over US 20 & US 218	Black Hawk	1498.0 ft	Fair	1983
NB I-380 over City Sts Ccp& Up Rr	Linn	1479.0 ft	Fair	1979
SB I-380 over City Streets Up &ccp Rr	Linn	1470.1 ft	Fair	1979
Ia 137 over Des Moines River	Wapello	1460.0 ft	Good	2006
Ia 92 over Iowa River	Louisa	1449.1 ft	Fair	1985
NB US 61 & 151 over Ia 946 & City Sts& Ccp R	Dubuque	1435.0 ft	Fair	1990
US 6 EB over Frnt RD & 2nd AVE	Pottawattamie	1421.9 ft	Good	2022
US 69 over Bn Rr Scott Ave& Mlk Pkw	Polk	1407.2 ft	Fair	1937
SB US 61 & 151 over Ia 946 & City Sts& Ccp R	Dubuque	1370.1 ft	Fair	1990
Us218nb To I80 WB over I 80 Ramps F & G	Johnson	1350.1 ft	Good	2023
SW 9th ST over Cherry Rr Mlk PKWY	Polk	1334.0 ft	Poor	1967
US 218 SB over 4th 5th 6th & W Park	Black Hawk	1333.0 ft	Good	1991
NB US 218 over 4th 5th 6th & W Park	Black Hawk	1316.9 ft	Good	1991
US 61 & 136 over Des Moines Rvr Rr & RD	Lee	1302.2 ft	Fair	1994
G Avenue over Rrs N 10th And N 13th	Pottawattamie	1290.0 ft	Fair	2006
Ol Mormon Br RD over Pigeon CR And Up Rr	Pottawattamie	1280.8 ft	Fair	2005
M AVE over Iowa River	Iowa	1265.1 ft	Poor	1950
FM over Des Moines River	Wapello	1245.1 ft	Poor	1957
2nd AVE S over Des Moines River	Webster	1209.0 ft	Fair	1959
X 99 Franklin ST over Iowa River	Louisa	1199.1 ft	Good	2020
Westown Parkway over I-80/I-35	Polk	1195.9 ft	Good	1997
I80us6 WB To I29nb over II Rr & Drainage Ditch	Pottawattamie	1192.9 ft	Good	2017
EB I-80 over Cedar River	Cedar	1188.3 ft	Good	2009
I 80 WB over Cedar River	Cedar	1188.3 ft	Good	2010
X 99 over Iowa River	Louisa	1159.1 ft	Fair	2014
F44 290th ST over Cedar River	Cedar	1145.0 ft	Poor	1948
WB US 30 over Cedar River	Linn	1141.1 ft	Fair	1975
US 30 EB over Cedar River	Linn	1140.1 ft	Good	2022
FM over Dm River	Mahaska	1139.1 ft	Good	2010
SW 9th ST over Raccoon River & Trail	Polk	1136.2 ft	Poor	1967
Ia 2 EB over Missouri River Overflow	Fremont	1103.0 ft	Good	2019
Ia 2 WB over Missouri River Overflow	Fremont	1103.0 ft	Good	2020
Ia 4 (n Elm St) over Up Rr & Mckinley ST	Greene	1100.1 ft	Good	2012
Chillicothe RD over Des Moines River	Wapello	1080.1 ft	Good	2011
US 6 over US 6 To I 80 EB	Pottawattamie	1077.1 ft	Good	2019
Floyd BLVD over 3rd ST & Rr	Woodbury	1074.1 ft	Fair	1986
US 151 NB over Maquoketa River	Jones	1073.2 ft	Good	2003
US 151 SB over Maquoketa River	Jones	1073.2 ft	Good	2003
Ia 92 WB over Mosquito Creek & Rr	Pottawattamie	1065.0 ft	Good	2015
Ia 92 EB over Mosquito Creek & II Rr	Pottawattamie	1063.6 ft	Good	2016
I 29 NB over Mosquito Ck II Rr Path	Pottawattamie	1056.1 ft	Good	2016
I 29 SB over Mosquito Ck II Rr Path	Pottawattamie	1056.1 ft	Good	2016
FM over Cedar River	Muscatine	1054.1 ft	Poor	1966
WB I-235 over Ia 163/univ Ave/ramp	Polk	1045.9 ft	Good	2004
1st AVE S over 21st ST & Rr	Webster	1044.0 ft	Fair	1968
US 61 over Iowa River	Louisa	1040.0 ft	Fair	1980
FM over Cedar River	Benton	1038.1 ft	Poor	1968
Ia 1 over Cedar River	Linn	1036.1 ft	Good	1992
Lewis Access RD over Cedar River	Linn	1036.1 ft	Fair	1961
US 6 over Cedar River	Muscatine	1036.1 ft	Fair	1972
FM over Cedar River	Benton	1034.1 ft	Poor	1969
Ia 210 over Des Moines River	Boone	1021.0 ft	Fair	1973
EB I-235 over University AVE	Polk	1019.0 ft	Good	2005
6th ST over Floyd Clark & Rr	Woodbury	1012.1 ft	Fair	1965
200th Street over Floyd River	Plymouth	1001.0 ft	Fair	2007
US 30 EB over Up Rr 21st ST SW Creek	Linn	996.1 ft	Fair	1980
US 30 WB over Up Rr 21st ST SW Creek	Linn	996.1 ft	Fair	1980
Ia 17 over Des Moines River	Polk	987.9 ft	Fair	1959
Ia 22 over Cedar River	Muscatine	965.9 ft	Good	1987
FM over Des Moines River	Van Buren	961.0 ft	Fair	1985
I29 SB To I480 WB over Frontage WB Broadway	Pottawattamie	960.0 ft	Good	2023
FM over Des Moines River	Van Buren	949.1 ft	Fair	1977
Fleur DR over Raccoon And Rr	Polk	946.9 ft	Poor	1936
Uni AVE WB Entr over WB Exit Ramp Univ. Ave.	Polk	938.0 ft	Good	2004
W40 over Des Moines River	Van Buren	937.0 ft	Poor	1960
I29 NB To I80 WB over I 29 NB	Pottawattamie	920.6 ft	Good	2019
Mlk Jr PKWY N over Racoon River Fleur Rr	Polk	919.9 ft	Good	2004
Mlk Jr PKWY S over Racoon River Fleur Rr	Polk	919.9 ft	Good	2004
NB US 65 over Des Moines River	Polk	919.9 ft	Good	1997
SB US 65 over Des Mones River	Polk	919.9 ft	Good	1997
North 3rd ST over Soldier Creek & Trail	Webster	918.0 ft	Poor	1961
Outer Drive over Floyd River & Cnic Rr	Woodbury	912.1 ft	Good	2009
Ia 27 SB over Des Moines River	Lee	907.2 ft	Fair	2002
Ia 27 NB over Des Moines River	Lee	907.2 ft	Fair	2002
NW Beaver DR over I 35 I 80 Beaver Creek	Polk	903.5 ft	Good	2016
Local over Des Moines River	Mahaska	902.9 ft	Fair	1987
Edgewood RD over Prairie Creek & Up Rr	Linn	901.9 ft	Good	2009
NE 22nd ST over I 80 & I 35	Polk	898.6 ft	Good	2017
Ia 57 over Cedar River	Black Hawk	898.0 ft	Fair	1974
NB US 218 over Black Hawk Ck & RD	Black Hawk	897.0 ft	Fair	1991
SB US 218 over Black Hawk Ck & RD	Black Hawk	897.0 ft	Fair	1991
I 380 SB over Ianr Rr Tx ST Cedar Rvr	Black Hawk	887.1 ft	Fair	1983
I80 EB To Us218 SB over I80 WB To US 218 SB	Johnson	876.6 ft	Good	2020
FM Sutliff RD over Cedar River	Johnson	872.0 ft	Fair	1983
Market ST over Des Moines River	Wapello	867.1 ft	Fair	1972
I 235 over Des Moines Rvr Rbrtraydr	Polk	863.8 ft	Good	1962
Ia 14 over Up Rr Madison&market ST	Marshall	861.9 ft	Fair	1985
I380 SB To I80 EB over I 80 Ramps E & G	Johnson	861.2 ft	Good	2022
US 61/151 SB over 4th 5th White ST	Dubuque	860.9 ft	Fair	1992
US 75 NB over Ccp Rr & Bnsf Rr & Bus 7	Woodbury	857.0 ft	Fair	1999
S 3rd ST over Up Rr & ST	Marshall	854.0 ft	Fair	1984
Univ AVE over Des Moines River	Polk	849.1 ft	Fair	1920
NW 66th AVE over Des Moines River	Polk	834.0 ft	Good	2016
US 34 over E Nodaway River & Bnsf R	Adams	831.0 ft	Fair	1964
SE 6th ST over Des Moines River	Polk	830.1 ft	Poor	1976
US 218 over Cedar Rvr & Trail	Black Hawk	828.1 ft	Fair	1989
FM over Cedar River	Cedar	827.1 ft	Poor	1966
Ia5 W To I35 S over I-35 & Ia #5 Ramp C	Polk	827.1 ft	Good	2000
Cedar River PKWY over Cedar River	Bremer	826.1 ft	Good	2019
FM over Cedar River	Muscatine	815.9 ft	Fair	1997
V64 over Des Moines River	Van Buren	815.9 ft	Good	2016
County Line RD over Ia 5	Warren	814.0 ft	Good	2000
Ia 150 over Cedar River	Benton	812.0 ft	Fair	1980
12th AVE over Cedar River & RD	Linn	799.9 ft	Fair	1974
SW 7th ST over Raccoon R & Trail	Polk	798.9 ft	Fair	1915
Ia 2 over Des Moines River	Van Buren	796.3 ft	Good	2012
US 75 SB over Floyd River	Woodbury	784.1 ft	Fair	1999
US 75 NB over Floyd River	Woodbury	784.1 ft	Fair	2000
US 30 over Boyer Rvr & Cc Rr & Road	Harrison	782.2 ft	Fair	1973
US 151 NB over N Fork Maquoketa River	Dubuque	778.9 ft	Good	2002
US 151 SB over N Fork Maquoketa River	Dubuque	778.9 ft	Good	2002
FM over Des Moines River	Wapello	776.9 ft	Good	1985
US 34 & 63 over Des Moines River	Wapello	775.9 ft	Good	2013
FM S-25 over I 35	Franklin	771.0 ft	Fair	1973
E Wahsburn RD over Cedar River	Black Hawk	769.0 ft	Fair	1958
Ia 2 over W Nishnabotna River Ovfl	Fremont	762.1 ft	Fair	1953
US 34 Ramp C over Bnsf Rr & City Streets	Des Moines	759.8 ft	Fair	1972
221st Street over Over Bnsf Rr	Mills	759.8 ft	Fair	2009
US 69 over Des Moines River	Polk	757.9 ft	Fair	1936
US 75 SB over Ccp Rr & Bnsf Rr & Ramp	Woodbury	756.9 ft	Fair	1999
US 218 over Quarry Lake & Wyth RD	Black Hawk	755.9 ft	Fair	1989
FM over Des Moines River	Van Buren	753.0 ft	Fair	1960
Scott AVE over Des Moines River	Polk	747.0 ft	Fair	1937
NB US 61/151 over 4th 5th White ST	Dubuque	743.1 ft	Fair	1992
NE 54th AVE over I 35	Polk	742.8 ft	Good	2017
Kenyon RD SB over Cn Rr And 7th Street	Webster	742.1 ft	Fair	1936
Kenyon RD NB over Cn Rr And 7th ST	Webster	742.1 ft	Fair	1977
US 20 EB US 71 SB over North Raccoon River	Sac	735.2 ft	Good	2012
US 20 WB US 71 NB over North Raccoon River	Sac	735.2 ft	Good	2012
Ia 1 over Skunk River & Access RD	Washington	733.9 ft	Good	2015
Ia 44 over North Raccoon River	Dallas	730.0 ft	Fair	1973
US 30 WB over Des Moines River	Boone	724.1 ft	Fair	1963
FM over Des Moines River	Boone	724.1 ft	Fair	1980
3rd ST over US 61 & 151	Dubuque	724.1 ft	Good	1991
FM over Des Moines River	Boone	723.1 ft	Poor	1972
Guthrie AVE over Over Up Rr	Polk	721.1 ft	Fair	1978
Mlk EB over Des Moines River	Polk	720.1 ft	Good	2010