| US 151 over Drainage Ditch | 1964 | 14,100 | Fair |
| US 151 over Unnamed Creek | 2001 | 12,200 | Good |
| 3RD Street over Fawn Creek | 1965 | 7,954 | Fair |
| US 151 SB over Wapsipinicon River | 1964 | 7,350 | Fair |
| US 151 NB over Wapsipinicon River | 2002 | 7,200 | Fair |
| US 151 NB over Kitty Creek | 2002 | 6,250 | Good |
| US 151 SB over Kitty Creek | 1960 | 6,250 | Fair |
| South Main St over Branch of Kitty Creek | 1972 | 6,117 | Fair |
| US 151 SB over Ia 64 | 2001 | 6,000 | Good |
| US 151 SB over Ia 1 | 2001 | 5,300 | Good |
| NB US 151 over Ia 1 | 2001 | 5,200 | Good |
| US 151 NB over Ia 64 | 2001 | 4,850 | Good |
| US 151 SB over Maquoketa River | 2003 | 4,500 | Good |
| US 151 NB over Maquoketa River | 2003 | 4,400 | Good |
| US 151 NB over W Branch of Kitty Creek | 2003 | 4,400 | Good |
| US 151 SB over W Branch of Kitty Creek | 2003 | 4,400 | Good |
| US 151 NB over Kitty Creek | 2002 | 4,300 | Fair |
| US 151 SB over Kitty Creek | 2002 | 4,300 | Good |
| US 151 SB over Amber Rd | 2001 | 4,200 | Good |
| US 151 NB over Amber Rd | 2001 | 4,100 | Good |
| US 151 SB over Iowa 38 | 2002 | 4,100 | Good |
| US 151 NB over Iowa 38 | 2002 | 4,000 | Good |
| County Rd E-34 over Wapsipinicon River | 1994 | 3,896 | Good |
| Main St E over Division Creek | 1900 | 3,776 | Fair |
| Ia 38 over Kitty Creek | 1973 | 3,630 | Fair |
| Ia 38 over Maquoketa River | 1974 | 3,310 | Fair |
| Ia 64 over Drainage Ditch | 1979 | 2,790 | Good |
| North Main St over Maquoketa River | 1969 | 2,787 | Fair |
| Ia 64 over Drainage Ditch | 1979 | 2,760 | Good |
| Ia 64 over Drainage Ditch | 1979 | 2,760 | Good |
| Ia 64 & 136 over Little Bear Creek | 1978 | 2,470 | Fair |
| Ia 38 over Sandy Creek | 1973 | 2,380 | Good |
| Ia 38 & 64 over Big Bear Creek | 1978 | 1,860 | Good |
| Ia 64 over Drainage Ditch | 1979 | 1,720 | Good |
| Ia 64 over Stream | 1979 | 1,720 | Good |
| Ia 38 over Walnut Creek | 1977 | 1,550 | Fair |
| Ia 38 over Wapsipinicon Overflow | 1977 | 1,410 | Fair |
| Ia 38 over Wapsipinicon River | 1977 | 1,410 | Fair |
| County Rd E-28 over Buffalo Creek | 1995 | 1,237 | Good |
| Ia 38 over Sibles Creek | 1951 | 1,080 | Fair |
| Ia 38 over Sibles Creek | 1953 | 1,080 | Fair |
| Sycamore St over Division Creek | 2007 | 1,011 | Good |
| County Rd X-44 over Kitty Creek | 2010 | 1,009 | Good |
| Ia 136 over Little Bear Creek | 1952 | 930 | Fair |
| County Rd X-40 over Trib to Walnut Creek | 1998 | 770 | Fair |
| County Rd X-40 over Walnut Creek | 1960 | 770 | Fair |
| County Rd X-40 over White Oak Creek | 1960 | 770 | Fair |
| Ia 136 over Farm Creek | 1986 | 770 | Good |
| Ia 136 over Maquoketa River | 1968 | 770 | Fair |
| Ia 136 over Ovrflw S F Maquoketa Rvr | 1987 | 770 | Good |
| Ia 136 over Stream | 1940 | 770 | Fair |
| Ia 136 over Stream | 2016 | 750 | Good |
| County Rd E-16 over Branch of Wet Creek | 1968 | 727 | Fair |
| County Rd E-16 over Wet Creek | 1968 | 727 | Fair |
| Ia 136 over Mineral Creek | 1955 | 710 | Good |
| Ia 136 over Mineral Creek | 1955 | 710 | Fair |
| Ia 38 over Drainage Ditch | 1990 | 680 | Fair |
| Shaw Rd over Division Creek | 2020 | 671 | Good |
| Shaw Rd over Fawn Creek | 2020 | 671 | Good |
| Ia 136 over Bear Creek | 1983 | 670 | Good |
| Ia 136 over Stream | 2022 | 670 | Good |
| County Rd X-44 over Small Creek | 2007 | 668 | Fair |
| Co Rd E 45 over Catfish Creek | 2018 | 648 | Fair |
| Ia 38 over Drainage Ditch | 1957 | 630 | Fair |
| Ia 38 over Stream | 1957 | 630 | Fair |
| County Rd X-44 over Big Bear Creek | 1978 | 619 | Fair |
| County Rd D-62 over Silver Creek | 1960 | 599 | Fair |
| County Rd D-62 over Wet Creek | 1992 | 599 | Fair |
| County Rd. D-61 over White Water | 2005 | 579 | Good |
| County Rd E-45 over Small Creek | 1966 | 570 | Fair |
| County Rd. E-45 over North Fork Walnut Creek | 1966 | 570 | Fair |
| Division St over Division Creek | 1900 | 555 | Fair |
| County Rd. X-28 over Wapsipinicon River | 1971 | 550 | Fair |
| Hardscrabble Rd over Deer Creek | 2007 | 540 | Good |
| E 1ST St over Kitty Creek | 2017 | 529 | Good |
| County Rd X-31 over Mino Creek | 1966 | 520 | Poor |
| County Rd X-31 over Sams Creek | 1966 | 520 | Fair |
| 2ND St S E over Division Creek | 1988 | 501 | Good |
| Buffalo Road over Drainage | 2022 | 442 | Good |
| County Rd X-64 over Mill Creek | 1957 | 432 | Fair |
| County Rd E-45 over Small Creek | 1980 | 422 | Fair |
| County Rd E-45 over Small Creek | 1971 | 422 | Fair |
| Langworthy Rd over Kitty Creek | 1960 | 412 | Fair |
| X 75 over Big Bear Creek | 2017 | 403 | Good |
| Co Rd X64 over Wapsipinicon River | 1949 | 393 | Fair |
| County Rd X-64 over Overflow | 1950 | 393 | Poor |
| County Rd X-31 over Silver Creek | 2010 | 383 | Good |
| Forest Chapel over Dutch Creek | 1995 | 304 | Good |
| Stone City Rd. over Crow Creek | 1975 | 295 | Poor |
| Stone Bridge Rd over Dry Creek | 1997 | 294 | Fair |
| Stone Bridge Rd over Wet Creek | 1893 | 294 | Poor |
| Jones St over Little Bear Creek | 1989 | 256 | Fair |
| 150TH Ave. over Small Creek | 1959 | 242 | Poor |
| Webster St over Little Bear Creek | 1954 | 230 | Fair |
| County Rd. X-75 over Wapsipinicon River | 1985 | 226 | Good |
| County Rd E-45 over Small Creek | 1985 | 216 | Fair |
| Newport Rd over Catfish Creek | 2015 | 206 | Good |
| County Rd E-53 over Small Creek | 1971 | 196 | Fair |
| Ebys Mill Rd over Farm Creek | 1951 | 187 | Fair |
| Butterfield Rd. over Farm Creek | 1974 | 176 | Fair |
| River Rd. over Small Creek | 1976 | 176 | Fair |
| Langworthy Rd over Kitty Creek | 1960 | 147 | Fair |
| 190TH St over Branch Kitty Creek | 1959 | 137 | Fair |
| Hard Scrabble over Silver Creek | 1983 | 137 | Good |
| Old Cass Rd. over Small Creek | 1900 | 135 | Fair |
| 100TH Ave over Bear Creek | 2008 | 128 | Good |
| 60TH Ave. over Small Creek | 2007 | 123 | Fair |
| Stone Bridge Rd over Br Kitty Creek | 1998 | 113 | Fair |
| 215TH Ave over Dutch Creek | 1991 | 108 | Fair |
| County Rd. E-17 over Small Creek | 1954 | 108 | Fair |
| Rock Rd over Cline Creek | 2002 | 108 | Good |
| 130TH Ave. over Branch of Kitty Creek | 1975 | 104 | Fair |
| 190TH Ave over Kitty Creek | 1991 | 104 | Fair |
| 32ND St. over Sibles Creek | 1982 | 98 | Good |
| Fremont Rd. over Buffalo Creek | 1985 | 98 | Good |
| 140TH Ave over Bear Creek | 2019 | 91 | Good |
| 220TH St. over Branch of Silver Creek | 1980 | 91 | Fair |
| Central Park Rd over Mineral Creek | 2015 | 90 | Good |
| 170TH St. over Branch Kitty Creek | 1978 | 88 | Fair |
| 35TH St. over Walnut Creek | 1980 | 88 | Good |
| County Rd. E-17 over Branch Kitty Creek | 1997 | 88 | Fair |
| Freemont Rd. over Helmer Creek | 1976 | 88 | Fair |
| Riverview Rd. over Farm Creek | 1978 | 82 | Fair |
| Timber Rd over Wet Creek | 2000 | 82 | Fair |
| 158TH St. over Sams Creek | 1986 | 79 | Fair |
| 30TH St. over Small | 1978 | 79 | Fair |
| Landis Rd over Wapsipinicon River | 1909 | 78 | Poor |
| Landis Rd. over Small Creek | 1937 | 78 | Fair |
| Old Cass Rd. over Helmer Creek | 1983 | 73 | Fair |
| 100TH Avenue over Wapsipinicon River | 2003 | 69 | Good |
| 148TH St. over Mineral Creek | 1988 | 69 | Fair |
| 42ND St over Sybill Creek | 2014 | 69 | Good |
| 80TH St. over Small Creek | 2011 | 69 | Fair |
| Fremont Rd. over Helmer Creek | 1984 | 69 | Fair |
| 130TH Ave. over Branch Kitty Creek | 1969 | 62 | Fair |
| 75TH Ave. over Small Creek | 2006 | 62 | Fair |
| Jungletown Rd. over Small Creek | 1998 | 62 | Fair |
| Military Rd over Br Kitty Creek | 1936 | 62 | Fair |
| Newport Rd. over Small Creek | 1945 | 62 | Poor |
| 130TH St. over Big Bear Creek | 1989 | 59 | Good |
| 215TH Ave. over Northfork Walnut Creek | 1988 | 59 | Good |
| 25TH Street over Pioneer Creek | 2004 | 59 | Good |
| 42ND St. over S Fork Walnut Creek | 1994 | 59 | Fair |
| 80TH St. over Small Creek | 2011 | 59 | Good |
| Jones-deleware over Cline Creek | 2006 | 59 | Good |
| 148TH St. over Small Creek | 1973 | 51 | Fair |
| 170TH Ave. over Bear Creek | 1976 | 51 | Fair |
| 200TH Ave. over Small Creek | 1967 | 51 | Poor |
| 45TH Ave. over Beers Creek | 1978 | 51 | Fair |
| 95TH St. over Small Stream | 1982 | 51 | Fair |
| 158TH St. over Helmer Creek | 1988 | 49 | Good |
| 160TH Ave. over Walnut Creek | 1974 | 49 | Fair |
| 200TH Ave. over White Oak Creek | 1947 | 49 | Fair |
| White Oak Rd. over South Fork Walnut Creek | 1970 | 49 | Fair |
| 170TH Street over Small Creek | 2001 | 47 | Fair |
| 200TH Ave. over N Fk Walnut Creek | 1985 | 47 | Fair |
| 200TH Avenue over S Fork Walnut Creek | 1970 | 47 | Fair |
| 230TH Ave. over S Fork Walnut Creek | 1990 | 47 | Good |
| Bear Creek Rd. over Bear Creek | 1988 | 47 | Fair |
| 222ND Ave. over Grove Creek | 1976 | 44 | Fair |
| 35TH St over Walnut Creek | 2005 | 44 | Good |
| Cherry Grove Rd over S Fork Walnut Creek | 1988 | 44 | Good |
| Ebys Mill Rd over Maquoketa River | 2009 | 44 | Good |
| Ebys Mill Rd over Small Creek | 1964 | 44 | Poor |
| Linn-jones Rd. over Creek | 1985 | 44 | Fair |
| Linn-jones Rd. over Silver Creek | 1990 | 44 | Fair |
| 140TH Ave. over Mineral Creek | 1970 | 41 | Fair |
| 170TH St over Branch Kitty Creek | 2001 | 41 | Fair |
| 170TH St. over Kitty Creek | 1988 | 41 | Good |
| 70TH St. over Small Stream | 1988 | 41 | Good |
| Bluebird Rd over Small Creek | 2014 | 41 | Fair |
| Bluebird Rd over Farm Creek | 2018 | 39 | Good |
| Hard Scrabble over Silver Creek | 1992 | 39 | Good |
| 100TH Ave. over Little Bear Creek | 2006 | 35 | Fair |
| 175TH St. over Kitty Creek | 1983 | 35 | Fair |
| 60TH Ave. over Mineral Creek | 1976 | 35 | Fair |
| 15TH Ave. over Mineral Creek | 1950 | 34 | Fair |
| 20TH Ave. over Beers Creek | 1970 | 34 | Fair |
| 35TH St. over White Oak Creek | 1990 | 34 | Good |
| 60TH Ave over Mill Creek | 1981 | 34 | Good |
| 72ND St. over Small Creek | 1992 | 34 | Fair |
| 35TH St. over So Fork Walnut | 1990 | 33 | Fair |
| 35TH St. over South Fork Walnut Creek | 1979 | 33 | Fair |
| Jones-delaware over Grove Creek | 1985 | 33 | Fair |
| 130TH St over Branch of Mineral Creek | 1956 | 30 | Fair |
| Cherry Grove Rd over White Oak Creek | 1978 | 30 | Fair |
| Finch Rd. over Beers Creek | 1977 | 30 | Fair |
| 120TH Ave over Branch Kitty Creek | 1981 | 29 | Fair |
| Hills Rd. over Farm Creek | 2008 | 29 | Good |
| 110TH Ave over Big Bear Creek | 1989 | 26 | Good |
| County Home Rd. over Mineral Creek | 1945 | 26 | Fair |
| Madison Rd over Barto Creek | 2021 | 26 | Good |
| 140TH Ave over Small Creek | 1987 | 25 | Good |
| 140TH Ave. over Small Creek | 1974 | 25 | Fair |
| 202ND St. over Farm Creek | 1956 | 25 | Fair |
| 20TH Ave over Bear Creek | 1991 | 25 | Good |
| Temple Hill Rd over S Fork Maquoketa River | 1991 | 25 | Good |
| 120TH St over Big Bear Creek | 1991 | 21 | Fair |
| 228TH Ave. over Dutch Creek | 2008 | 21 | Fair |
| 98TH St over Little Bear Creek | 2012 | 21 | Good |
| 105TH Ave over Mineral Creek | 2017 | 20 | Good |
| 180TH St over Small Stream | 1994 | 20 | Fair |
| 230TH St. over Silver Creek | 1971 | 20 | Fair |
| 95TH Ave over Branch of Mineral Creek | 1953 | 20 | Fair |
| Jones-delaware over Grove Creek | 1992 | 20 | Good |
| 120TH Ave over Small Creek | 1980 | 16 | Fair |
| 80TH Ave. over Little Bear Creek | 1957 | 16 | Fair |
| 88TH Ave over Mineral Creek | 1995 | 16 | Good |
| 150TH St over Br Kitty Creek | 2001 | 15 | Fair |
| 215TH St. over Branch of Silver Creek | 1940 | 15 | Fair |
| 80TH Ave. over Mineral Creek | 1979 | 15 | Fair |
| 155TH St. over Branch of Mineral Creek | 1941 | 11 | Fair |
| 155TH St. over Mineral Creek | 1992 | 11 | Good |
| 190TH Ave. over Stream | 1974 | 11 | Fair |
| 20TH St. over White Oak Creek | 1985 | 11 | Fair |
| 220TH Ave. over White Oak Creek | 1947 | 11 | Fair |
| 25TH Ave over Loss Creek | 1967 | 11 | Poor |
| 62ND Street over Small Creek | 1980 | 11 | Fair |
| Bunker Hill Rd over Beers Creek | 2015 | 11 | Fair |
| Bunker Hill Rd over Beers Creek | 1981 | 11 | Fair |
| Bunker Hill Rd over Beers Creek | 2019 | 11 | Good |
| Bunker Hill Rd. over Beers Creek | 1977 | 11 | Fair |
| Bunker Hill Rd. over Beers Creek Tributary | 1956 | 11 | Fair |
| 130TH St. over Mineral Creek | 1989 | 10 | Good |
| 50TH Ave. over Small Creek | 1983 | 10 | Fair |
| 95TH Ave. over Mineral Creek | 2006 | 10 | Good |
| Anamosa Reform over Buffalo Creek | 1900 | – | Fair |
| Wapsipinicon Sp over Dutch Creek | 1925 | – | Fair |
| Wapsipinicon Sp over Dutch Creek | 1995 | – | Good |
| Wapsipinicon Sp over Dutch Creek | 1925 | – | Poor |