| County RD X-31 over Mino Creek | Poor | 42.0 ft | 520 | 1966 |
| County RD X-64 over Overflow | Poor | 81.0 ft | 393 | 1950 |
| Stone City Rd. over Crow Creek | Poor | 62.0 ft | 295 | 1975 |
| Stone Bridge RD over Wet Creek | Poor | 67.9 ft | 294 | 1893 |
| 150th Ave. over Small Creek | Poor | 44.0 ft | 242 | 1959 |
| Landis RD over Wapsipinicon River | Poor | 245.1 ft | 78 | 1909 |
| Newport Rd. over Small Creek | Poor | 38.1 ft | 62 | 1945 |
| 200th Ave. over Small Creek | Poor | 33.1 ft | 51 | 1967 |
| Ebys Mill RD over Small Creek | Poor | 30.8 ft | 44 | 1964 |
| 25th AVE over Loss Creek | Poor | 70.9 ft | 11 | 1967 |
| Wapsipinicon Sp over Dutch Creek | Poor | 40.0 ft | 0 | 1925 |
| US 151 over Drainage Ditch | Fair | 22.0 ft | 14,100 | 1964 |
| 3rd Street over Fawn Creek | Fair | 21.0 ft | 7,954 | 1965 |
| US 151 SB over Wapsipinicon River | Fair | 431.1 ft | 7,350 | 1964 |
| US 151 NB over Wapsipinicon River | Fair | 438.0 ft | 7,200 | 2002 |
| US 151 SB over Kitty Creek | Fair | 71.9 ft | 6,250 | 1960 |
| South Main ST over Branch Of Kitty Creek | Fair | 26.9 ft | 6,117 | 1972 |
| US 151 NB over Kitty Creek | Fair | 170.9 ft | 4,300 | 2002 |
| Main ST E over Division Creek | Fair | 26.9 ft | 3,776 | 1900 |
| Ia 38 over Kitty Creek | Fair | 158.1 ft | 3,630 | 1973 |
| Ia 38 over Maquoketa River | Fair | 388.1 ft | 3,310 | 1974 |
| North Main ST over Maquoketa River | Fair | 353.0 ft | 2,787 | 1969 |
| Ia 64 & 136 over Little Bear Creek | Fair | 103.0 ft | 2,470 | 1978 |
| Ia 38 over Walnut Creek | Fair | 201.1 ft | 1,550 | 1977 |
| Ia 38 over Wapsipinicon River | Fair | 624.0 ft | 1,410 | 1977 |
| Ia 38 over Wapsipinicon Overflow | Fair | 201.1 ft | 1,410 | 1977 |
| Ia 38 over Sibles Creek | Fair | 74.1 ft | 1,080 | 1951 |
| Ia 38 over Sibles Creek | Fair | 74.1 ft | 1,080 | 1953 |
| Ia 136 over Little Bear Creek | Fair | 111.9 ft | 930 | 1952 |
| Ia 136 over Maquoketa River | Fair | 458.0 ft | 770 | 1968 |
| Ia 136 over Stream | Fair | 42.0 ft | 770 | 1940 |
| County RD X-40 over Trib To Walnut Creek | Fair | 24.9 ft | 770 | 1998 |
| County RD X-40 over Walnut Creek | Fair | 81.0 ft | 770 | 1960 |
| County RD X-40 over White Oak Creek | Fair | 62.0 ft | 770 | 1960 |
| County RD E-16 over Wet Creek | Fair | 35.1 ft | 727 | 1968 |
| County RD E-16 over Branch Of Wet Creek | Fair | 21.0 ft | 727 | 1968 |
| Ia 136 over Mineral Creek | Fair | 127.0 ft | 710 | 1955 |
| Ia 38 over Drainage Ditch | Fair | 24.0 ft | 680 | 1990 |
| County RD X-44 over Small Creek | Fair | 24.0 ft | 668 | 2007 |
| Co RD E 45 over Catfish Creek | Fair | 24.9 ft | 648 | 2018 |
| Ia 38 over Stream | Fair | 40.0 ft | 630 | 1957 |
| Ia 38 over Drainage Ditch | Fair | 26.9 ft | 630 | 1957 |
| County RD X-44 over Big Bear Creek | Fair | 24.9 ft | 619 | 1978 |
| County RD D-62 over Silver Creek | Fair | 127.0 ft | 599 | 1960 |
| County RD D-62 over Wet Creek | Fair | 24.9 ft | 599 | 1992 |
| County Rd. E-45 over North Fork Walnut Creek | Fair | 77.1 ft | 570 | 1966 |
| County RD E-45 over Small Creek | Fair | 77.1 ft | 570 | 1966 |
| Division ST over Division Creek | Fair | 24.9 ft | 555 | 1900 |
| County Rd. X-28 over Wapsipinicon River | Fair | 262.1 ft | 550 | 1971 |
| County RD X-31 over Sams Creek | Fair | 30.8 ft | 520 | 1966 |
| County RD X-64 over Mill Creek | Fair | 169.9 ft | 432 | 1957 |
| County RD E-45 over Small Creek | Fair | 24.0 ft | 422 | 1980 |
| County RD E-45 over Small Creek | Fair | 24.0 ft | 422 | 1971 |
| Langworthy RD over Kitty Creek | Fair | 127.0 ft | 412 | 1960 |
| Co RD X64 over Wapsipinicon River | Fair | 335.0 ft | 393 | 1949 |
| Stone Bridge RD over Dry Creek | Fair | 24.9 ft | 294 | 1997 |
| Jones ST over Little Bear Creek | Fair | 78.1 ft | 256 | 1989 |
| Webster ST over Little Bear Creek | Fair | 69.9 ft | 230 | 1954 |
| County RD E-45 over Small Creek | Fair | 32.2 ft | 216 | 1985 |
| County RD E-53 over Small Creek | Fair | 24.0 ft | 196 | 1971 |
| Ebys Mill RD over Farm Creek | Fair | 69.9 ft | 187 | 1951 |
| Butterfield Rd. over Farm Creek | Fair | 25.6 ft | 176 | 1974 |
| River Rd. over Small Creek | Fair | 30.8 ft | 176 | 1976 |
| Langworthy RD over Kitty Creek | Fair | 154.9 ft | 147 | 1960 |
| 190th ST over Branch Kitty Creek | Fair | 82.0 ft | 137 | 1959 |
| Old Cass Rd. over Small Creek | Fair | 30.8 ft | 135 | 1900 |
| 60th Ave. over Small Creek | Fair | 22.0 ft | 123 | 2007 |
| Stone Bridge RD over Br Kitty Creek | Fair | 24.9 ft | 113 | 1998 |
| 215th AVE over Dutch Creek | Fair | 24.9 ft | 108 | 1991 |
| County Rd. E-17 over Small Creek | Fair | 58.1 ft | 108 | 1954 |
| 130th Ave. over Branch Of Kitty Creek | Fair | 63.0 ft | 104 | 1975 |
| 190th AVE over Kitty Creek | Fair | 36.1 ft | 104 | 1991 |
| 220th St. over Branch Of Silver Creek | Fair | 84.0 ft | 91 | 1980 |
| County Rd. E-17 over Branch Kitty Creek | Fair | 24.9 ft | 88 | 1997 |
| 170th St. over Branch Kitty Creek | Fair | 101.7 ft | 88 | 1978 |
| Freemont Rd. over Helmer Creek | Fair | 57.1 ft | 88 | 1976 |
| Riverview Rd. over Farm Creek | Fair | 37.4 ft | 82 | 1978 |
| Timber RD over Wet Creek | Fair | 60.0 ft | 82 | 2000 |
| 30th St. over Small | Fair | 21.0 ft | 79 | 1978 |
| 158th St. over Sams Creek | Fair | 27.9 ft | 79 | 1986 |
| Landis Rd. over Small Creek | Fair | 30.8 ft | 78 | 1937 |
| Old Cass Rd. over Helmer Creek | Fair | 24.9 ft | 73 | 1983 |
| 80th St. over Small Creek | Fair | 32.2 ft | 69 | 2011 |
| 148th St. over Mineral Creek | Fair | 24.9 ft | 69 | 1988 |
| Fremont Rd. over Helmer Creek | Fair | 32.2 ft | 69 | 1984 |
| 75th Ave. over Small Creek | Fair | 25.9 ft | 62 | 2006 |
| Jungletown Rd. over Small Creek | Fair | 24.9 ft | 62 | 1998 |
| 130th Ave. over Branch Kitty Creek | Fair | 30.8 ft | 62 | 1969 |
| Military RD over Br Kitty Creek | Fair | 41.0 ft | 62 | 1936 |
| 42nd St. over S Fork Walnut Creek | Fair | 36.1 ft | 59 | 1994 |
| 45th Ave. over Beers Creek | Fair | 30.8 ft | 51 | 1978 |
| 170th Ave. over Bear Creek | Fair | 30.8 ft | 51 | 1976 |
| 95th St. over Small Stream | Fair | 35.1 ft | 51 | 1982 |
| 148th St. over Small Creek | Fair | 24.9 ft | 51 | 1973 |
| 160th Ave. over Walnut Creek | Fair | 175.9 ft | 49 | 1974 |
| White Oak Rd. over South Fork Walnut Creek | Fair | 101.7 ft | 49 | 1970 |
| 200th Ave. over White Oak Creek | Fair | 46.9 ft | 49 | 1947 |
| 200th Ave. over N Fk Walnut Creek | Fair | 101.7 ft | 47 | 1985 |
| 200th Avenue over S Fork Walnut Creek | Fair | 55.1 ft | 47 | 1970 |
| Bear Creek Rd. over Bear Creek | Fair | 116.1 ft | 47 | 1988 |
| 170th Street over Small Creek | Fair | 21.0 ft | 47 | 2001 |
| 222nd Ave. over Grove Creek | Fair | 102.0 ft | 44 | 1976 |
| Linn-jones Rd. over Creek | Fair | 38.1 ft | 44 | 1985 |
| Linn-jones Rd. over Silver Creek | Fair | 45.9 ft | 44 | 1990 |
| 170th ST over Branch Kitty Creek | Fair | 24.9 ft | 41 | 2001 |
| 140th Ave. over Mineral Creek | Fair | 25.9 ft | 41 | 1970 |
| Bluebird RD over Small Creek | Fair | 21.0 ft | 41 | 2014 |
| 100th Ave. over Little Bear Creek | Fair | 25.9 ft | 35 | 2006 |
| 60th Ave. over Mineral Creek | Fair | 127.0 ft | 35 | 1976 |
| 175th St. over Kitty Creek | Fair | 42.0 ft | 35 | 1983 |
| 20th Ave. over Beers Creek | Fair | 42.0 ft | 34 | 1970 |
| 72nd St. over Small Creek | Fair | 45.9 ft | 34 | 1992 |
| 15th Ave. over Mineral Creek | Fair | 111.9 ft | 34 | 1950 |
| 35th St. over So Fork Walnut | Fair | 25.9 ft | 33 | 1990 |
| 35th St. over South Fork Walnut Creek | Fair | 24.9 ft | 33 | 1979 |
| Jones-delaware over Grove Creek | Fair | 36.1 ft | 33 | 1985 |
| Cherry Grove RD over White Oak Creek | Fair | 29.9 ft | 30 | 1978 |
| Finch Rd. over Beers Creek | Fair | 24.9 ft | 30 | 1977 |
| 130th ST over Branch Of Mineral Creek | Fair | 24.9 ft | 30 | 1956 |
| 120th AVE over Branch Kitty Creek | Fair | 33.1 ft | 29 | 1981 |
| County Home Rd. over Mineral Creek | Fair | 56.1 ft | 26 | 1945 |
| 140th Ave. over Small Creek | Fair | 56.1 ft | 25 | 1974 |
| 202nd St. over Farm Creek | Fair | 102.0 ft | 25 | 1956 |
| 120th ST over Big Bear Creek | Fair | 34.1 ft | 21 | 1991 |
| 228th Ave. over Dutch Creek | Fair | 24.9 ft | 21 | 2008 |
| 95th AVE over Branch Of Mineral Creek | Fair | 46.9 ft | 20 | 1953 |
| 230th St. over Silver Creek | Fair | 81.0 ft | 20 | 1971 |
| 180th ST over Small Stream | Fair | 25.9 ft | 20 | 1994 |
| 120th AVE over Small Creek | Fair | 29.9 ft | 16 | 1980 |
| 80th Ave. over Little Bear Creek | Fair | 52.2 ft | 16 | 1957 |
| 80th Ave. over Mineral Creek | Fair | 83.0 ft | 15 | 1979 |
| 150th ST over Br Kitty Creek | Fair | 22.0 ft | 15 | 2001 |
| 215th St. over Branch Of Silver Creek | Fair | 39.0 ft | 15 | 1940 |
| 62nd Street over Small Creek | Fair | 36.1 ft | 11 | 1980 |
| 220th Ave. over White Oak Creek | Fair | 30.8 ft | 11 | 1947 |
| 20th St. over White Oak Creek | Fair | 36.1 ft | 11 | 1985 |
| Bunker Hill RD over Beers Creek | Fair | 26.9 ft | 11 | 2015 |
| Bunker Hill Rd. over Beers Creek Tributary | Fair | 24.9 ft | 11 | 1956 |
| Bunker Hill RD over Beers Creek | Fair | 45.9 ft | 11 | 1981 |
| Bunker Hill Rd. over Beers Creek | Fair | 45.9 ft | 11 | 1977 |
| 155th St. over Branch Of Mineral Creek | Fair | 41.0 ft | 11 | 1941 |
| 190th Ave. over Stream | Fair | 24.9 ft | 11 | 1974 |
| 50th Ave. over Small Creek | Fair | 35.1 ft | 10 | 1983 |
| Wapsipinicon Sp over Dutch Creek | Fair | 40.0 ft | 0 | 1925 |
| Anamosa Reform over Buffalo Creek | Fair | 102.0 ft | 0 | 1900 |
| US 151 over Unnamed Creek | Good | 43.0 ft | 12,200 | 2001 |
| US 151 NB over Kitty Creek | Good | 123.0 ft | 6,250 | 2002 |
| US 151 SB over Ia 64 | Good | 203.1 ft | 6,000 | 2001 |
| US 151 SB over Ia 1 | Good | 204.1 ft | 5,300 | 2001 |
| NB US 151 over Ia 1 | Good | 200.1 ft | 5,200 | 2001 |
| US 151 NB over Ia 64 | Good | 203.1 ft | 4,850 | 2001 |
| US 151 SB over Maquoketa River | Good | 1073.2 ft | 4,500 | 2003 |
| US 151 NB over Maquoketa River | Good | 1073.2 ft | 4,400 | 2003 |
| US 151 SB over W Branch Of Kitty Creek | Good | 248.0 ft | 4,400 | 2003 |
| US 151 NB over W Branch Of Kitty Creek | Good | 248.0 ft | 4,400 | 2003 |
| US 151 SB over Kitty Creek | Good | 170.9 ft | 4,300 | 2002 |
| US 151 SB over Amber RD | Good | 212.9 ft | 4,200 | 2001 |
| US 151 NB over Amber RD | Good | 212.9 ft | 4,100 | 2001 |
| US 151 SB over Iowa 38 | Good | 232.9 ft | 4,100 | 2002 |
| US 151 NB over Iowa 38 | Good | 232.9 ft | 4,000 | 2002 |
| County RD E-34 over Wapsipinicon River | Good | 326.1 ft | 3,896 | 1994 |
| Ia 64 over Drainage Ditch | Good | 21.0 ft | 2,790 | 1979 |
| Ia 64 over Drainage Ditch | Good | 28.9 ft | 2,760 | 1979 |
| Ia 64 over Drainage Ditch | Good | 23.0 ft | 2,760 | 1979 |
| Ia 38 over Sandy Creek | Good | 33.1 ft | 2,380 | 1973 |
| Ia 38 & 64 over Big Bear Creek | Good | 103.0 ft | 1,860 | 1978 |
| Ia 64 over Stream | Good | 38.1 ft | 1,720 | 1979 |
| Ia 64 over Drainage Ditch | Good | 24.9 ft | 1,720 | 1979 |
| County RD E-28 over Buffalo Creek | Good | 229.0 ft | 1,237 | 1995 |
| Sycamore ST over Division Creek | Good | 24.9 ft | 1,011 | 2007 |
| County RD X-44 over Kitty Creek | Good | 103.0 ft | 1,009 | 2010 |
| Ia 136 over Ovrflw S F Maquoketa Rvr | Good | 83.0 ft | 770 | 1987 |
| Ia 136 over Farm Creek | Good | 128.0 ft | 770 | 1986 |
| Ia 136 over Stream | Good | 25.9 ft | 750 | 2016 |
| Ia 136 over Mineral Creek | Good | 58.1 ft | 710 | 1955 |
| Shaw RD over Fawn Creek | Good | 32.2 ft | 671 | 2020 |
| Shaw RD over Division Creek | Good | 29.9 ft | 671 | 2020 |
| Ia 136 over Stream | Good | 32.5 ft | 670 | 2022 |
| Ia 136 over Bear Creek | Good | 132.9 ft | 670 | 1983 |
| County Rd. D-61 over White Water | Good | 216.9 ft | 579 | 2005 |
| Hardscrabble RD over Deer Creek | Good | 128.0 ft | 540 | 2007 |
| E 1st ST over Kitty Creek | Good | 103.0 ft | 529 | 2017 |
| 2nd ST S E over Division Creek | Good | 28.9 ft | 501 | 1988 |
| Buffalo Road over Drainage | Good | 92.8 ft | 442 | 2022 |
| X 75 over Big Bear Creek | Good | 143.0 ft | 403 | 2017 |
| County RD X-31 over Silver Creek | Good | 112.9 ft | 383 | 2010 |
| Forest Chapel over Dutch Creek | Good | 32.2 ft | 304 | 1995 |
| County Rd. X-75 over Wapsipinicon River | Good | 549.5 ft | 226 | 1985 |
| Newport RD over Catfish Creek | Good | 38.1 ft | 206 | 2015 |
| Hard Scrabble over Silver Creek | Good | 182.1 ft | 137 | 1983 |
| 100th AVE over Bear Creek | Good | 132.9 ft | 128 | 2008 |
| Rock RD over Cline Creek | Good | 128.0 ft | 108 | 2002 |
| 32nd St. over Sibles Creek | Good | 126.6 ft | 98 | 1982 |
| Fremont Rd. over Buffalo Creek | Good | 173.9 ft | 98 | 1985 |
| 140th AVE over Bear Creek | Good | 103.0 ft | 91 | 2019 |
| Central Park RD over Mineral Creek | Good | 24.9 ft | 90 | 2015 |
| 35th St. over Walnut Creek | Good | 151.6 ft | 88 | 1980 |
| 100th Avenue over Wapsipinicon River | Good | 346.1 ft | 69 | 2003 |
| 42nd ST over Sybill Creek | Good | 112.9 ft | 69 | 2014 |
| 25th Street over Pioneer Creek | Good | 103.0 ft | 59 | 2004 |
| 215th Ave. over Northfork Walnut Creek | Good | 90.9 ft | 59 | 1988 |
| 130th St. over Big Bear Creek | Good | 46.9 ft | 59 | 1989 |
| 80th St. over Small Creek | Good | 73.2 ft | 59 | 2011 |
| Jones-deleware over Cline Creek | Good | 78.1 ft | 59 | 2006 |
| 158th St. over Helmer Creek | Good | 38.1 ft | 49 | 1988 |
| 230th Ave. over S Fork Walnut Creek | Good | 103.0 ft | 47 | 1990 |
| 35th ST over Walnut Creek | Good | 216.9 ft | 44 | 2005 |
| Cherry Grove RD over S Fork Walnut Creek | Good | 103.0 ft | 44 | 1988 |
| Ebys Mill RD over Maquoketa River | Good | 367.1 ft | 44 | 2009 |
| 170th St. over Kitty Creek | Good | 25.9 ft | 41 | 1988 |
| 70th St. over Small Stream | Good | 23.0 ft | 41 | 1988 |
| Bluebird RD over Farm Creek | Good | 112.9 ft | 39 | 2018 |
| Hard Scrabble over Silver Creek | Good | 154.9 ft | 39 | 1992 |
| 60th AVE over Mill Creek | Good | 92.8 ft | 34 | 1981 |
| 35th St. over White Oak Creek | Good | 103.0 ft | 34 | 1990 |
| Hills Rd. over Farm Creek | Good | 24.0 ft | 29 | 2008 |
| Madison RD over Barto Creek | Good | 22.0 ft | 26 | 2021 |
| 110th AVE over Big Bear Creek | Good | 54.1 ft | 26 | 1989 |
| 20th AVE over Bear Creek | Good | 128.0 ft | 25 | 1991 |
| Temple Hill RD over S Fork Maquoketa River | Good | 392.1 ft | 25 | 1991 |
| 140th AVE over Small Creek | Good | 128.0 ft | 25 | 1987 |
| 98th ST over Little Bear Creek | Good | 92.8 ft | 21 | 2012 |
| 105th AVE over Mineral Creek | Good | 92.8 ft | 20 | 2017 |
| Jones-delaware over Grove Creek | Good | 103.0 ft | 20 | 1992 |
| 88th AVE over Mineral Creek | Good | 20.0 ft | 16 | 1995 |
| Bunker Hill RD over Beers Creek | Good | 27.9 ft | 11 | 2019 |
| 155th St. over Mineral Creek | Good | 30.8 ft | 11 | 1992 |
| 130th St. over Mineral Creek | Good | 42.0 ft | 10 | 1989 |
| 95th Ave. over Mineral Creek | Good | 89.9 ft | 10 | 2006 |
| Wapsipinicon Sp over Dutch Creek | Good | 39.0 ft | 0 | 1995 |