| Needham AVE over Small Natural Stream | Poor | 24.9 ft | 1,117 | 1939 |
| FM over Indian Creek | Poor | 103.0 ft | 938 | 1969 |
| 255th ST over Little Indian Creek | Poor | 25.9 ft | 928 | 1968 |
| FM over Boyer River | Poor | 103.0 ft | 848 | 1956 |
| High ST over Drainage | Poor | 58.1 ft | 479 | 1968 |
| FM over Raccoon River | Poor | 253.0 ft | 290 | 1965 |
| D15 190th ST over Boyer River | Poor | 103.0 ft | 280 | 1964 |
| FM over No Name Creek | Poor | 27.9 ft | 249 | 1925 |
| FM over Overflow On Boyer River | Poor | 78.1 ft | 249 | 1964 |
| Willow ST over Drainage | Poor | 21.0 ft | 232 | 1900 |
| FM over No Name Creek | Poor | 32.2 ft | 170 | 1969 |
| FM over Racoon River | Poor | 170.9 ft | 120 | 1920 |
| FM over Raccoon River | Poor | 246.1 ft | 110 | 1974 |
| FM over Small Stream | Poor | 30.8 ft | 110 | 1977 |
| Local over Stream | Poor | 44.9 ft | 100 | 1957 |
| FM over Odebolt Creek | Poor | 69.9 ft | 71 | 1951 |
| FM over Racoon River | Poor | 154.9 ft | 71 | 1924 |
| FM over Unnamed Creek | Poor | 57.1 ft | 60 | 1955 |
| FM over Boyer River | Poor | 128.0 ft | 60 | 1958 |
| Local over Boyer River | Poor | 92.8 ft | 60 | 1916 |
| FM over Stream | Poor | 27.9 ft | 50 | 1924 |
| Local over Halfway Creek | Poor | 45.9 ft | 50 | 1918 |
| FM over No Name Creek | Poor | 57.1 ft | 45 | 1954 |
| Local over No Name Creek | Poor | 57.1 ft | 45 | 1964 |
| Local RD over Otter Creek | Poor | 57.1 ft | 45 | 1968 |
| FM over Raccoon River | Poor | 184.1 ft | 45 | 1921 |
| Local over Small Stream | Poor | 53.1 ft | 45 | 1914 |
| Local over Dd#16 | Poor | 22.0 ft | 45 | 1924 |
| Local over Stream | Poor | 44.9 ft | 45 | 1961 |
| Local over No Name Creek | Poor | 26.9 ft | 34 | 1926 |
| Local over Stream | Poor | 43.0 ft | 34 | 1934 |
| Local over Small Creek | Poor | 33.1 ft | 34 | 1925 |
| Local over Boyer Valley | Poor | 92.8 ft | 34 | 1925 |
| FM over Cedar Creek D D #181 | Poor | 128.0 ft | 34 | 1966 |
| Local over Stream | Poor | 34.1 ft | 30 | 1917 |
| Local over Small Stream | Poor | 39.0 ft | 30 | 1985 |
| Local Road over Small Stream | Poor | 24.0 ft | 30 | 1923 |
| Local Road over Small Stream | Poor | 29.9 ft | 30 | 1932 |
| Local Road over Drainage | Poor | 32.2 ft | 30 | 1964 |
| Local RD over Small | Poor | 25.9 ft | 30 | 1977 |
| Local over Stream | Poor | 32.2 ft | 30 | 1981 |
| FM over Small Stream | Poor | 39.0 ft | 26 | 1945 |
| Local over Small Stream | Poor | 57.1 ft | 26 | 1971 |
| Local over Small Stream | Poor | 42.0 ft | 26 | 1986 |
| Local over Stream | Poor | 33.1 ft | 26 | 1924 |
| FM over D D #71 | Poor | 24.9 ft | 26 | 1930 |
| Local over Stream | Poor | 103.0 ft | 26 | 1953 |
| Local over Raccoon River | Poor | 91.9 ft | 26 | 1930 |
| FM over Stream | Poor | 44.9 ft | 26 | 1981 |
| FM over Small Stream | Poor | 32.2 ft | 20 | 1974 |
| FM over Dd #71 | Poor | 42.0 ft | 20 | 1920 |
| Local over Small Stream | Poor | 24.9 ft | 20 | 1949 |
| Local over Stream | Poor | 57.1 ft | 20 | 1956 |
| Local over Small Stream | Poor | 60.0 ft | 20 | 1931 |
| Local over Small Stream | Poor | 32.2 ft | 15 | 1974 |
| Local over Boyer River | Poor | 151.9 ft | 15 | 1931 |
| Local over Odebolt Creek | Poor | 58.1 ft | 15 | 1981 |
| Local over Small Stream | Poor | 38.1 ft | 15 | 1923 |
| Local over Small Stream | Poor | 64.0 ft | 15 | 1980 |
| Local over Stream | Poor | 32.2 ft | 15 | 1960 |
| Local over Stream | Poor | 32.2 ft | 11 | 1958 |
| Local over Small Stream | Poor | 86.0 ft | 11 | 1924 |
| Local over Stream | Poor | 29.9 ft | 11 | 1932 |
| Local over Small Stream | Poor | 28.9 ft | 11 | 1953 |
| Local over Small Stream | Poor | 24.0 ft | 11 | 1916 |
| Ia 175 over High ST | Fair | 40.0 ft | 2,540 | 1934 |
| Ia 175 over Stream | Fair | 22.0 ft | 1,820 | 1937 |
| Ia 175 over Boyer River | Fair | 169.9 ft | 1,820 | 1967 |
| Ia 39 over Natural Stream | Fair | 22.0 ft | 1,540 | 1951 |
| Ia 175 over Odebolt Creek | Fair | 98.1 ft | 1,500 | 1994 |
| Ia 471 over Drainage Ditch | Fair | 22.0 ft | 1,320 | 1933 |
| N 5th ST over North Raccoon River | Fair | 204.1 ft | 1,109 | 1973 |
| Ia 471 over Boyer River | Fair | 190.9 ft | 1,070 | 1984 |
| D 36 (255th St) over Drainage Ditch | Fair | 24.9 ft | 679 | 1933 |
| FM over Boyer River | Fair | 210.0 ft | 489 | 1950 |
| FM over Halfway Creek | Fair | 35.1 ft | 469 | 1991 |
| FM over No Name Creek | Fair | 103.0 ft | 450 | 1971 |
| Ahrens ST over Raccoon River | Fair | 230.0 ft | 354 | 1982 |
| FM over Inlet Blackhawk Lk | Fair | 78.1 ft | 330 | 1989 |
| FM over Racoon River | Fair | 203.1 ft | 319 | 1970 |
| FM over Halfway Creek | Fair | 103.0 ft | 319 | 1973 |
| FM over Racoon River | Fair | 203.1 ft | 290 | 1972 |
| FM over Dd 81 | Fair | 24.0 ft | 270 | 1988 |
| Local over Cedar Creek | Fair | 128.9 ft | 230 | 1987 |
| FM over Dd #57 | Fair | 32.2 ft | 210 | 1975 |
| FM over Raccoon River | Fair | 205.1 ft | 159 | 1985 |
| FM over Raccoon River | Fair | 246.1 ft | 150 | 1974 |
| FM over Porter Creek | Fair | 59.1 ft | 100 | 1960 |
| FM over Boyer River | Fair | 179.1 ft | 100 | 1975 |
| FM over Boyer River | Fair | 179.1 ft | 100 | 1979 |
| FM over Small | Fair | 33.1 ft | 71 | 1979 |
| Local over Stream | Fair | 25.9 ft | 60 | 1957 |
| FM over Small Stream | Fair | 102.0 ft | 60 | 1984 |
| Local over Stream | Fair | 44.9 ft | 60 | 1957 |
| FM over Lime Creek | Fair | 24.0 ft | 50 | 1922 |
| FM over Small Stream | Fair | 25.9 ft | 50 | 1930 |
| Local over Stream | Fair | 28.9 ft | 50 | 1924 |
| Local over Raccoon River | Fair | 246.1 ft | 40 | 1976 |
| Local over Stream | Fair | 35.1 ft | 40 | 1934 |
| Local over Stream | Fair | 57.1 ft | 40 | 1960 |
| FM over Dd #31 | Fair | 35.1 ft | 34 | 1919 |
| Local over No Name Creek | Fair | 24.9 ft | 34 | 1988 |
| Local over Boyer Creek | Fair | 103.0 ft | 34 | 1958 |
| Local Road over Boyer River | Fair | 178.1 ft | 30 | 1969 |
| Local over Stream | Fair | 103.0 ft | 30 | 1973 |
| FM over Odebolt Creek | Fair | 32.2 ft | 30 | 1970 |
| FM over Small | Fair | 78.1 ft | 30 | 1978 |
| Local over Elk Creek | Fair | 29.9 ft | 30 | 1984 |
| Local Road over Small Stream | Fair | 24.0 ft | 26 | 1919 |
| FM over Porter Creek | Fair | 103.0 ft | 26 | 1953 |
| FM over Stream | Fair | 152.9 ft | 26 | 1966 |
| Local over Stream | Fair | 26.9 ft | 26 | 1928 |
| FM over Small Creek | Fair | 33.1 ft | 26 | 1919 |
| Local over Small Stream | Fair | 22.0 ft | 26 | 1919 |
| Local over Raccoon River | Fair | 127.0 ft | 26 | 1975 |
| Local over Small Stream | Fair | 23.0 ft | 26 | 1917 |
| FM over Boyer River | Fair | 180.1 ft | 26 | 1976 |
| Local over Stream | Fair | 24.0 ft | 26 | 1985 |
| Local over Small Stream | Fair | 78.1 ft | 20 | 1971 |
| FM over Indian Creek | Fair | 25.9 ft | 20 | 1917 |
| Local over Small Stream | Fair | 127.0 ft | 20 | 1985 |
| Local over Stream | Fair | 28.9 ft | 20 | 1994 |
| Local over Raccoon River | Fair | 226.0 ft | 20 | 1985 |
| FM over Boyer River | Fair | 152.9 ft | 20 | 1967 |
| FM over Stream | Fair | 27.9 ft | 15 | 1923 |
| Local over Wheeler Creek | Fair | 35.1 ft | 15 | 1932 |
| Local over Small Stream | Fair | 90.9 ft | 15 | 1985 |
| Local over Boyer River | Fair | 179.1 ft | 15 | 1974 |
| Local over Boyer River | Fair | 179.1 ft | 15 | 1979 |
| Local over Small Stream | Fair | 56.1 ft | 15 | 1986 |
| Local over Boyer River | Fair | 90.9 ft | 15 | 1981 |
| Local over Small Stream | Fair | 28.9 ft | 15 | 1985 |
| Local over Stream | Fair | 32.2 ft | 11 | 1973 |
| Local over Small Stream | Fair | 42.0 ft | 5 | 1922 |
| Local over Boyer River | Fair | 116.1 ft | 5 | 1978 |
| Pk 607(blkhawk) over Black Hawk Lake | Fair | 47.9 ft | 0 | 1989 |
| US 20 over Unnamed Stream | Good | 24.9 ft | 4,850 | 2017 |
| E Main ST over Raccoon River | Good | 241.1 ft | 3,853 | 2004 |
| US 20 EB US 71 SB over North Raccoon River | Good | 735.2 ft | 3,300 | 2012 |
| US 20 WB US 71 NB over North Raccoon River | Good | 735.2 ft | 3,300 | 2012 |
| US 20 EB over Cedar Creek | Good | 306.1 ft | 2,950 | 2012 |
| US 20 WB over Cedar Creek | Good | 306.1 ft | 2,950 | 2012 |
| US 20 EB over US 71 NB | Good | 201.1 ft | 2,440 | 2012 |
| US 20 WB over US 71 NB | Good | 201.1 ft | 2,440 | 2012 |
| US 20 EB over Boyer River | Good | 307.1 ft | 2,425 | 2018 |
| US 20 WB over Boyer River | Good | 307.1 ft | 2,425 | 2017 |
| US 20 EB over US 71 SB & Ia 471 | Good | 226.4 ft | 2,195 | 2012 |
| US 20 WB over US 71 SB & Ia 471 | Good | 226.4 ft | 2,195 | 2012 |
| US 71 over Raccoon River | Good | 271.0 ft | 1,720 | 2015 |
| US 71 over Cedar Creek | Good | 267.1 ft | 1,720 | 2015 |
| Ia 175 over Stream | Good | 36.1 ft | 1,700 | 2011 |
| Ia 175 over Stream | Good | 24.9 ft | 1,680 | 2002 |
| Ia 39 over Porter Creek | Good | 26.9 ft | 1,450 | 2023 |
| FM over Odebolt Creek | Good | 24.9 ft | 1,228 | 1984 |
| S.center Street over Lime Creek - Dd #3 | Good | 92.8 ft | 1,196 | 2009 |
| S Center Street over Dd #1 | Good | 103.0 ft | 1,196 | 2009 |
| Ia 471 over Branch Boyer River | Good | 24.9 ft | 1,070 | 1984 |
| 255th ST over Big Cedar Creek | Good | 179.1 ft | 1,008 | 1993 |
| Gard AVE over Boyer River | Good | 25.9 ft | 848 | 2010 |
| FM over Small Creek | Good | 25.9 ft | 748 | 2000 |
| FM over Inlet Creek | Good | 25.9 ft | 638 | 1987 |
| FM over Dd #57 | Good | 25.9 ft | 628 | 2007 |
| D54 355th ST over Stream | Good | 29.9 ft | 559 | 2022 |
| M43 Gard AVE over Stream | Good | 21.0 ft | 559 | 2017 |
| M43 Gard AVE over Stream | Good | 21.0 ft | 559 | 2017 |
| FM over Lime Creek | Good | 24.9 ft | 529 | 1999 |
| FM over Dd 38 (buck Run Creek) | Good | 44.0 ft | 509 | 2008 |
| D59 360th ST over Creek | Good | 35.1 ft | 330 | 2014 |
| N14 Union AVE over Stream | Good | 35.1 ft | 330 | 2022 |
| Main ST over Drainage | Good | 26.9 ft | 306 | 2003 |
| FM over No Name Creek | Good | 24.9 ft | 290 | 1992 |
| FM over So Silver Creek | Good | 21.0 ft | 170 | 1999 |
| Cory AVE over Elk Creek | Good | 103.0 ft | 170 | 2010 |
| Quincy AVE over Indian Creek | Good | 102.0 ft | 139 | 2017 |
| Walnut ST over Odebolt Creek | Good | 28.9 ft | 120 | 2023 |
| Otter AVE over Stream | Good | 40.0 ft | 71 | 2019 |
| Local over Lime Creek | Good | 24.9 ft | 50 | 1989 |
| FM over Cedar Creek | Good | 128.0 ft | 50 | 2006 |
| Local over Stream | Good | 128.9 ft | 45 | 1993 |
| Local over Stream | Good | 103.0 ft | 40 | 2005 |
| 320th ST over Indian Creek | Good | 103.0 ft | 40 | 2021 |
| Ira Avenue over Stream | Good | 24.0 ft | 40 | 2022 |
| Local over Boyer River | Good | 152.9 ft | 40 | 1994 |
| Local over Boyer River | Good | 149.9 ft | 40 | 2005 |
| Local over Stream | Good | 83.0 ft | 34 | 2008 |
| Local over Wall Lake Inlet | Good | 27.9 ft | 34 | 2002 |
| Local over Stream | Good | 83.0 ft | 34 | 2008 |
| Local over Small Stream | Good | 25.9 ft | 30 | 1994 |
| Local over Dd #25 | Good | 24.0 ft | 30 | 2001 |
| Local over Wall Lake Outlet | Good | 25.9 ft | 30 | 1993 |
| 300th ST over Small Stream | Good | 24.0 ft | 30 | 2019 |
| Local over Stream | Good | 26.9 ft | 30 | 2001 |
| Local over Raccoon River | Good | 178.1 ft | 30 | 1985 |
| 160th ST over Boyer Creek | Good | 25.9 ft | 30 | 2024 |
| FM over Indian Creek | Good | 128.0 ft | 26 | 1998 |
| Local over Racoon River | Good | 246.1 ft | 26 | 1992 |
| Local over Small Stream | Good | 21.0 ft | 26 | 1999 |
| Local over Boyer River | Good | 160.1 ft | 26 | 1989 |
| 270th ST over Indian River | Good | 32.2 ft | 25 | 2024 |
| Rolland AVE over Outlet Creek | Good | 40.0 ft | 20 | 2022 |
| Local over Stream | Good | 24.9 ft | 20 | 1997 |
| FM over Small Creek | Good | 24.9 ft | 20 | 1993 |
| Buchanan AVE over Stream | Good | 40.0 ft | 20 | 2000 |
| Local over Indian Creek | Good | 24.9 ft | 20 | 1999 |
| Buchanan AVE over Stream | Good | 25.9 ft | 20 | 2024 |
| Local over Stream | Good | 23.0 ft | 20 | 2003 |
| 230th ST over US 20 | Good | 323.2 ft | 20 | 2012 |
| 350th ST over Small Stream | Good | 36.1 ft | 15 | 2017 |
| Local over Stream | Good | 26.9 ft | 15 | 2001 |
| Dean AVE over Small Stream | Good | 24.0 ft | 15 | 2017 |
| Fox AVE over Boyer Creek | Good | 44.9 ft | 15 | 2021 |
| 180th ST over Stream | Good | 24.9 ft | 15 | 1997 |
| 300th ST over Creek | Good | 21.0 ft | 15 | 2014 |
| 380th ST over Small Stream | Good | 26.9 ft | 11 | 2012 |
| Local over Small Stream | Good | 21.0 ft | 11 | 1999 |
| Ira AVE over Stream | Good | 23.0 ft | 11 | 2020 |
| Esther AVE over Small Stream | Good | 20.0 ft | 11 | 2019 |
| Local over Raccoon River | Good | 160.1 ft | 11 | 1989 |
| Local over Stream | Good | 80.1 ft | 11 | 2002 |
| Local Road over Small Stream | Good | 28.9 ft | 5 | 2001 |
| Bettin AVE over Stream | Good | 37.1 ft | 5 | 2017 |