| Fleetwood RD over Bear CR | Poor | 22.0 ft | 589 | 1930 |
| Bridge ST over Honey Creek | Poor | 149.9 ft | 589 | 1973 |
| Grandview RD over Volga River | Poor | 299.9 ft | 491 | 1960 |
| 6th ST over Drainage | Poor | 22.0 ft | 242 | 1920 |
| Mesquite RD over Peck Creek | Poor | 42.0 ft | 113 | 1913 |
| Glacier RD over Stream | Poor | 28.9 ft | 79 | 1925 |
| Hornet RD over Bear Creek | Poor | 82.0 ft | 73 | 1923 |
| Essex AVE over Stream | Poor | 23.0 ft | 73 | 1910 |
| Kennedy RD over Stream | Poor | 25.9 ft | 62 | 1955 |
| Keystone RD over Stream | Poor | 32.2 ft | 62 | 1957 |
| Bighorn RD over Hewett Creek | Poor | 42.0 ft | 51 | 1920 |
| Coffee RD over Plum Creek | Poor | 27.9 ft | 49 | 1900 |
| Chariot RD over Small Stream | Poor | 44.0 ft | 49 | 1956 |
| Main St-fox AVE over Honey Creek | Poor | 84.0 ft | 47 | 1925 |
| Oak ST over Nagle Creek | Poor | 45.9 ft | 45 | 1915 |
| 300th ST over Miners Creek | Poor | 40.0 ft | 39 | 1916 |
| 318th ST over Cox Creek | Poor | 21.0 ft | 30 | 1920 |
| 265th ST over Stream | Poor | 41.0 ft | 26 | 1925 |
| 155th ST over Silver Creek | Poor | 25.9 ft | 26 | 1925 |
| Hennepin RD over Elk Creek | Poor | 82.0 ft | 25 | 1920 |
| June AVE over Small Stream | Poor | 25.9 ft | 21 | 1910 |
| Kahle AVE over Carlan CR | Poor | 40.4 ft | 21 | 1900 |
| Harvest RD over Stream | Poor | 24.0 ft | 21 | 1920 |
| Delta AVE over Stream | Poor | 23.0 ft | 16 | 1905 |
| Colony RD over Wolf Creek | Poor | 29.9 ft | 16 | 1916 |
| 172nd ST over Stream | Poor | 40.0 ft | 16 | 1916 |
| Essex RD over Roberts Creek | Poor | 50.9 ft | 16 | 1917 |
| Echo AVE over Stream | Poor | 25.9 ft | 11 | 1920 |
| Lantern AVE over Miners Creek | Poor | 33.1 ft | 11 | 1912 |
| A AVE over Stream | Poor | 22.0 ft | 11 | 1900 |
| 270th ST over Sm Stream | Poor | 29.9 ft | 11 | 1920 |
| Dove AVE over Roberts Creek | Poor | 37.1 ft | 11 | 1964 |
| Lantern AVE over Mill Creek | Poor | 22.0 ft | 11 | 1940 |
| 300th ST over Branch Nagel Creek | Poor | 52.2 ft | 11 | 1935 |
| Home Ent (sdb) over Panther Creek | Poor | 32.2 ft | 10 | 1920 |
| Drumlin RD over Schneiders Creek | Poor | 74.1 ft | 10 | 1914 |
| B60-ivory RD over North Cedar Creek | Poor | 34.1 ft | 5 | 1913 |
| 310th ST over Miners Creek | Poor | 37.1 ft | 4 | 1915 |
| US 18 over Mississippi River Ia 76 | Fair | 2561.0 ft | 10,100 | 1974 |
| Bridge ST over Turkey River | Fair | 189.0 ft | 4,755 | 1889 |
| US 18 over Unnamed Creek | Fair | 44.0 ft | 4,730 | 1988 |
| US 18 & 52 over Branch Roberts Creek | Fair | 41.0 ft | 4,140 | 1967 |
| US 18 over Bloody Run & Dme Rr | Fair | 470.1 ft | 4,140 | 1988 |
| US 52 over Turkey River | Fair | 522.0 ft | 3,340 | 1968 |
| US 52 over Miners Creek | Fair | 120.1 ft | 3,340 | 1974 |
| US 52 over Little Turkey River | Fair | 205.1 ft | 2,780 | 1974 |
| Ia 13 over Cox Creek | Fair | 129.9 ft | 2,680 | 1978 |
| Ia 13 over Cox Creek | Fair | 154.9 ft | 2,680 | 1978 |
| Ia 13 over Volga River | Fair | 313.0 ft | 2,680 | 1978 |
| Ia 56 over Pony Creek | Fair | 52.2 ft | 1,280 | 1983 |
| Great River RD over Buck Creek | Fair | 162.1 ft | 1,228 | 1979 |
| FM over Sny Magill | Fair | 158.1 ft | 953 | 1980 |
| Grandview RD over Small Stream | Fair | 24.9 ft | 874 | 1984 |
| C-02w over Volga River | Fair | 254.9 ft | 690 | 1975 |
| Basswood AVE over Roberts Creek | Fair | 128.0 ft | 668 | 2002 |
| Garber RD over South Cedar Creek | Fair | 129.9 ft | 638 | 2009 |
| Domino RD over Pine Creek | Fair | 75.1 ft | 619 | 1973 |
| Domino RD over Wolf Creek | Fair | 87.9 ft | 619 | 1973 |
| Domino RD over Schneiders Creek | Fair | 75.1 ft | 619 | 1973 |
| Domino RD over Stream | Fair | 30.8 ft | 619 | 1920 |
| Great River RD over Panther Creek | Fair | 100.1 ft | 579 | 1968 |
| Forestville RD over Stream | Fair | 61.0 ft | 560 | 1949 |
| Diplomat RD over Hickory Creek | Fair | 44.0 ft | 511 | 1953 |
| Co X21 over Volga River | Fair | 240.2 ft | 462 | 1953 |
| Osterdock RD over Turkey River | Fair | 410.1 ft | 440 | 1957 |
| HWY 410 over Drainage Ditch | Fair | 22.0 ft | 422 | 1928 |
| Osterdock RD over Joles Creek | Fair | 123.0 ft | 412 | 1942 |
| Great River RD over Blue Bell Creek | Fair | 116.1 ft | 403 | 1983 |
| Apple RD over Stream | Fair | 29.9 ft | 403 | 1949 |
| Great River RD over Little Turkey River | Fair | 150.9 ft | 403 | 1983 |
| X-28 over Roberts Creek | Fair | 89.9 ft | 350 | 1941 |
| Great River RD over Panther CR | Fair | 100.1 ft | 344 | 1968 |
| FM over Howard Creek | Fair | 103.0 ft | 344 | 1983 |
| Osterdock RD over Carlan Creek | Fair | 26.9 ft | 311 | 1981 |
| Agate RD over Sand Creek | Fair | 103.0 ft | 295 | 2002 |
| Agate RD over Small Stream | Fair | 27.9 ft | 295 | 1978 |
| Canoe RD over Nagle Creek | Fair | 115.2 ft | 280 | 2007 |
| C 24 Canoe RD over Hewett Creek | Fair | 60.0 ft | 275 | 1935 |
| Aspen RD over Willow Creek | Fair | 25.9 ft | 275 | 1914 |
| Bush RD over Deep Creek | Fair | 103.0 ft | 275 | 1978 |
| Jupiter RD over Wayman Creek | Fair | 125.0 ft | 246 | 1951 |
| Tuff ST over Small Creek | Fair | 39.0 ft | 232 | 1973 |
| 190th ST over Stream | Fair | 20.0 ft | 206 | 1988 |
| Grape RD over Robert Creek | Fair | 210.0 ft | 196 | 1946 |
| Local over Small Ditch | Fair | 24.9 ft | 180 | 1908 |
| Mississippi RD over Small | Fair | 43.0 ft | 157 | 1979 |
| Aspen AVE over Roberts Creek | Fair | 26.9 ft | 157 | 1957 |
| Froelich RD over Stream | Fair | 30.8 ft | 154 | 1904 |
| 145th ST over Stream | Fair | 30.8 ft | 137 | 1925 |
| Emblem RD over Cox Creek | Fair | 120.1 ft | 135 | 2008 |
| 232nd ST over Buck Creek | Fair | 124.0 ft | 113 | 1973 |
| 390th ST over Maquoketa River | Fair | 125.0 ft | 108 | 1958 |
| Glacier RD over Doe CR | Fair | 125.0 ft | 108 | 1958 |
| 165th ST over Deer CR | Fair | 44.0 ft | 108 | 1957 |
| 165th ST over Roberts CR | Fair | 82.0 ft | 108 | 1958 |
| Hickory AVE over Bloody Run | Fair | 30.8 ft | 108 | 1920 |
| Cherryvalley RD over Small Stream | Fair | 25.9 ft | 104 | 2012 |
| Eagle RD over Roberts Creek | Fair | 125.0 ft | 98 | 1986 |
| Dogwood AVE over Silver Creek | Fair | 26.9 ft | 98 | 1930 |
| 120th ST over Roberts Creek | Fair | 37.1 ft | 98 | 1900 |
| Spook Cave RD over Sm Stream | Fair | 24.9 ft | 91 | 1954 |
| Dolphin AVE over Stream | Fair | 44.0 ft | 88 | 1953 |
| 290th ST over Coon Creek | Fair | 33.1 ft | 82 | 1920 |
| Heron AVE over Dry Mill Creek | Fair | 33.1 ft | 82 | 1960 |
| 125th ST over Stream | Fair | 26.9 ft | 82 | 1957 |
| Iowa AVE over Stream | Fair | 26.9 ft | 79 | 1940 |
| Horseshoe RD over Elk Creek | Fair | 109.9 ft | 79 | 1939 |
| Lace AVE over Sm Stream | Fair | 30.8 ft | 79 | 1955 |
| FM Buck Ck RD over Stream | Fair | 67.9 ft | 79 | 1954 |
| Buck Creek RD over Stream | Fair | 30.8 ft | 79 | 1954 |
| Egret RD over Stream | Fair | 49.9 ft | 79 | 1940 |
| King RD over Buck Creek | Fair | 23.0 ft | 79 | 1938 |
| Chariot RD over Stream | Fair | 55.1 ft | 79 | 1954 |
| Chariot RD over Sm Stream | Fair | 26.9 ft | 73 | 1953 |
| 125th ST over Stream | Fair | 56.1 ft | 73 | 1957 |
| Lumber RD over Small | Fair | 24.0 ft | 70 | 1976 |
| Grape RD over Dry Mill CR | Fair | 127.0 ft | 69 | 1959 |
| Cable AVE over Turkey River | Fair | 319.9 ft | 69 | 1953 |
| 145th ST over Small Creek | Fair | 24.9 ft | 69 | 1986 |
| Eagle RD over Stream | Fair | 44.0 ft | 69 | 1955 |
| Nickel RD over Little Turkey | Fair | 60.0 ft | 62 | 1935 |
| Marble RD over Little Turkey River | Fair | 128.0 ft | 62 | 1979 |
| Landau RD over Little Turkey | Fair | 110.9 ft | 62 | 1955 |
| Graham RD over Stream | Fair | 22.0 ft | 62 | 1918 |
| Bixby RD over Nagle Creek | Fair | 44.0 ft | 62 | 1960 |
| Kayak RD over Sny Magill Creek | Fair | 120.1 ft | 62 | 1947 |
| Keystone RD over Stream | Fair | 26.9 ft | 62 | 1925 |
| Keystone RD over Stream | Fair | 26.9 ft | 62 | 1957 |
| Horseshoe RD over Steeles Creek | Fair | 82.0 ft | 59 | 1953 |
| King RD over Sny Magill CR | Fair | 149.9 ft | 59 | 1945 |
| 145th ST over Roberts Creek | Fair | 125.0 ft | 59 | 1953 |
| 160th ST over Deer Creek | Fair | 44.0 ft | 51 | 1958 |
| 160th ST over Deer Creek | Fair | 56.1 ft | 51 | 1956 |
| Chariot RD over Small Stream | Fair | 57.1 ft | 49 | 1953 |
| 165th ST over Stream | Fair | 37.1 ft | 47 | 1975 |
| Big Springs RD over Stream | Fair | 56.1 ft | 47 | 1954 |
| Concord AVE over Stream | Fair | 26.9 ft | 47 | 1948 |
| Lower Cedar RD over Cedar Creek | Fair | 44.0 ft | 44 | 1930 |
| Crystal RD over Hewett Creek | Fair | 100.1 ft | 44 | 1977 |
| 352nd ST over Stream | Fair | 22.0 ft | 41 | 1998 |
| 260th ST over Schneiders Creek | Fair | 32.2 ft | 41 | 1915 |
| Dove AVE over Silver Creek | Fair | 24.9 ft | 41 | 1984 |
| Echo AVE over Honey Creek | Fair | 120.1 ft | 39 | 1951 |
| Fort RD over Stream | Fair | 26.9 ft | 39 | 1931 |
| ST Sebald RD over Stream | Fair | 60.0 ft | 39 | 1939 |
| Bear RD over Ensign Hollow | Fair | 20.0 ft | 39 | 1976 |
| Buck Creek RD over Buck Creek | Fair | 125.0 ft | 39 | 1954 |
| 330th ST over Spring Creek | Fair | 109.9 ft | 35 | 2012 |
| 190th ST over Sny Magill Creek | Fair | 35.1 ft | 35 | 1915 |
| Granite AVE over Dry Hollow | Fair | 46.9 ft | 35 | 1950 |
| Kennedy RD over Cedar Creek | Fair | 125.0 ft | 34 | 1955 |
| Kennedy RD over Stream | Fair | 26.9 ft | 34 | 1955 |
| Kennedy RD over Sm Stream | Fair | 33.1 ft | 34 | 1955 |
| Chariot RD over Stream | Fair | 43.0 ft | 34 | 1957 |
| Chariot RD over Sm Stream | Fair | 26.9 ft | 34 | 1957 |
| Chariot RD over Stream | Fair | 21.0 ft | 34 | 1954 |
| Belgiam RD over Stream | Fair | 26.9 ft | 30 | 1930 |
| Hemlock RD over Stream | Fair | 39.0 ft | 30 | 1999 |
| Hazel RD over Stream | Fair | 26.9 ft | 30 | 1954 |
| Keystone RD over Stream | Fair | 44.9 ft | 30 | 1958 |
| Concord AVE over Roberts Creek | Fair | 81.0 ft | 30 | 1958 |
| Wayman RD over Wayman Creek | Fair | 67.9 ft | 29 | 1952 |
| Harber RD over Stream | Fair | 26.9 ft | 29 | 1954 |
| 172nd ST over Small Stream | Fair | 22.0 ft | 26 | 2016 |
| Farmersburg RD over Roberts Creek | Fair | 89.9 ft | 25 | 1933 |
| Abbey RD over Stream | Fair | 27.9 ft | 25 | 1955 |
| Jigsaw RD over Cedar Creek | Fair | 44.0 ft | 21 | 1925 |
| Aztec RD over Mink Creek | Fair | 125.0 ft | 20 | 1963 |
| Fantail RD over Stream | Fair | 24.9 ft | 15 | 1925 |
| Jasmine RD over Cedar Creek | Fair | 125.0 ft | 15 | 1953 |
| Bush RD over Willow Creek | Fair | 38.1 ft | 15 | 1948 |
| 220th ST over Buck Creek | Fair | 21.0 ft | 15 | 1978 |
| 265th ST over Small Stream | Fair | 26.9 ft | 15 | 1977 |
| Birch RD over Stream | Fair | 26.9 ft | 15 | 1946 |
| A AVE over Stream | Fair | 33.1 ft | 15 | 1900 |
| 225th ST over Stream | Fair | 21.0 ft | 11 | 1916 |
| 160th ST over Stream | Fair | 20.0 ft | 11 | 1981 |
| Wayman RD over Wayman Creek | Fair | 55.1 ft | 10 | 1952 |
| Dolphin AVE over Schneider Creek | Fair | 26.9 ft | 10 | 1977 |
| Ia 13 over Roberts Creek | Good | 271.0 ft | 4,900 | 1979 |
| US 18 & 52 over Natural Stream | Good | 297.9 ft | 3,780 | 1967 |
| Ia 76 over Bloody Run Creek | Good | 180.1 ft | 3,580 | 1994 |
| Ia 13 over Dry Run Creek | Good | 30.8 ft | 3,370 | 1977 |
| Ia 13 over Turkey River | Good | 280.8 ft | 2,800 | 1982 |
| Ia 13 over Turkey River Overflow | Good | 190.9 ft | 2,800 | 1982 |
| US 52 over Mill Creek | Good | 39.0 ft | 2,780 | 1974 |
| Ia 13 over Dry Hollow Creek | Good | 171.9 ft | 2,380 | 1978 |
| US 52 over Branch Pony Creek | Good | 22.0 ft | 1,740 | 1975 |
| Ia 128 over Dry Mill Creek | Good | 202.1 ft | 1,420 | 1979 |
| Garber RD over Miners Creek | Good | 107.0 ft | 1,259 | 2018 |
| Ia 76 over Tang Creek | Good | 22.0 ft | 1,250 | 1969 |
| X 28 over Small Stream | Good | 140.1 ft | 1,179 | 2014 |
| FM over Buck Creek | Good | 125.0 ft | 894 | 1986 |
| Laredo RD over Turkey River | Good | 441.9 ft | 799 | 2002 |
| Jaguar RD over Elk Creek | Good | 150.9 ft | 579 | 2009 |
| 205th ST over Roberts Creek | Good | 204.1 ft | 304 | 1991 |
| B64 Agate RD over Stream | Good | 109.9 ft | 295 | 2018 |
| Tollgate RD over Small Stream | Good | 32.2 ft | 246 | 1982 |
| Jupiter RD over Turkey River | Good | 304.1 ft | 246 | 1983 |
| 250th ST over Stream | Good | 49.9 ft | 206 | 1999 |
| Mississippi RD over Stream | Good | 26.9 ft | 157 | 2005 |
| 165th ST over Silver Creek | Good | 112.9 ft | 137 | 1990 |
| Fawn Hollow over Roberts Creek | Good | 177.2 ft | 128 | 1984 |
| Fawn Hollow over Roberts Creek | Good | 177.2 ft | 118 | 1984 |
| Spook Cave RD over Bloody Run | Good | 116.1 ft | 113 | 2004 |
| C 5x Harvester RD over Bear Creek | Good | 140.1 ft | 108 | 2011 |
| Fawn Hollow over Roberts Creek | Good | 179.1 ft | 108 | 1984 |
| Cherry Valley R over Stream | Good | 26.9 ft | 104 | 1996 |
| Dolphin AVE over Hickory Creek | Good | 100.1 ft | 98 | 2013 |
| Crystal RD over Stream | Good | 125.0 ft | 88 | 1988 |
| Evergreen RD over Volga River | Good | 327.1 ft | 88 | 1995 |
| Iowa AVE over Elk Creek | Good | 181.1 ft | 79 | 2014 |
| Grape RD over Dry Mill Creek | Good | 120.1 ft | 79 | 2011 |
| 390th ST over Small Stream | Good | 30.8 ft | 79 | 1958 |
| Iowa AVE over Small Stream | Good | 27.9 ft | 79 | 2005 |
| 310th ST over Stream | Good | 22.0 ft | 73 | 2018 |
| Glider AVE over Stream | Good | 22.0 ft | 73 | 1985 |
| 145th ST over Silver Creek | Good | 24.9 ft | 69 | 1986 |
| Acorn RD over Stream | Good | 22.0 ft | 62 | 2000 |
| Keystone RD over Sny Magill | Good | 181.1 ft | 62 | 2017 |
| 130th ST over Roberts Creek | Good | 100.1 ft | 62 | 2017 |
| South ST over Small Stream | Good | 100.1 ft | 60 | 1979 |
| Iris AVE over Bloody Run | Good | 125.0 ft | 59 | 1996 |
| 295th ST over Stream | Good | 69.9 ft | 51 | 2023 |
| 215th ST over Small Stream | Good | 21.0 ft | 49 | 1986 |
| 230th Street over Dry Mill Creek | Good | 112.9 ft | 44 | 1993 |
| Mesquite RD over Small Stream | Good | 24.9 ft | 41 | 1986 |
| A AVE over Stream | Good | 25.9 ft | 39 | 1996 |
| 250th ST over Dry Mill Creek | Good | 129.9 ft | 35 | 2022 |
| 250th ST over Dry Mill Creek | Good | 43.0 ft | 35 | 2022 |
| Empire RD over Stream | Good | 24.0 ft | 35 | 2017 |
| Aztec RD over Stream | Good | 42.7 ft | 35 | 2020 |
| 348th ST over Dry Run Creek | Good | 100.1 ft | 30 | 2006 |
| Belgiam RD over Kleinlein Hollow | Good | 26.9 ft | 30 | 2004 |
| Hazel RD over Stream | Good | 26.9 ft | 30 | 1978 |
| Hawk AVE over Stream | Good | 21.0 ft | 30 | 2020 |
| Coral AVE over Silver Creek | Good | 23.0 ft | 30 | 2021 |
| Galaxy RD over Turkey River | Good | 191.9 ft | 30 | 2012 |
| Joles Hollow RD over Joles Creek | Good | 24.0 ft | 29 | 2018 |
| 172nd Street over Roberts Creek | Good | 100.1 ft | 26 | 1993 |
| 150th ST over Roberts Creek | Good | 109.9 ft | 26 | 2016 |
| 390th ST over Lindsey Creek | Good | 36.1 ft | 26 | 2006 |
| 290th ST over Stream | Good | 23.0 ft | 21 | 2018 |
| Armada RD over Stream | Good | 24.0 ft | 21 | 2020 |
| Hawk AVE over Stream | Good | 49.9 ft | 20 | 2016 |
| Delta AVE over Stream | Good | 30.8 ft | 16 | 1955 |
| Dogwood AVE over Stream | Good | 69.9 ft | 16 | 2020 |
| Acorn RD over Stream | Good | 42.7 ft | 11 | 2023 |
| Grain RD over Stream | Good | 23.0 ft | 11 | 2014 |
| Lace AVE over Small Stream | Good | 78.1 ft | 11 | 2005 |
| A AVE over Deep Creek | Good | 25.9 ft | 11 | 1998 |
| Golden AVE over Doe Creek | Good | 55.1 ft | 11 | 2002 |
| Nature AVE over Small Stream | Good | 23.0 ft | 11 | 2014 |
| 258th ST over Dry Mill Creek | Good | 28.9 ft | 10 | 2008 |
| Fawn Hollow RD over Stream | Good | 24.0 ft | 10 | 1979 |
| B45 over Unamed Creek | Good | 26.9 ft | 10 | 1988 |
| Big Spring Hatch over Stream | Good | 90.9 ft | 10 | 1992 |