| M-64 & M-38 over Ontonagon R River Rd RR | 2005 | 3,625 | Fair |
| M-28 over So Br Ontonagon River | 1990 | 2,398 | Good |
| M-28 over M Br Ontonagon River | 1929 | 2,303 | Fair |
| M-28|m-64 over Merryweather Creek | 1932 | 2,120 | Fair |
| M-64 over Cranberry River | 1948 | 2,117 | Fair |
| M-64 over Dreiss Creek | 1945 | 2,117 | Good |
| M-64 over Weigels Creek | 1945 | 2,117 | Fair |
| M-28 over Baltimore River | 1968 | 2,075 | Good |
| M-64 over Potato River | 1952 | 2,025 | Fair |
| M-28 over Wapato Creek | 1938 | 1,845 | Poor |
| M-64 over Floodwood River | 1968 | 1,725 | Good |
| US-45 over Roselawn Creek | 1957 | 1,700 | Fair |
| US-45 over Clear Creek | 1931 | 1,648 | Poor |
| US-45 over Clear Creek | 1963 | 1,648 | Fair |
| US-45 over Clear Creek | 1963 | 1,648 | Fair |
| US-45 over E Br of Ontonagon River | 1958 | 1,540 | Good |
| US-45 over E Br Baltimore River | 2015 | 1,450 | Good |
| M-26 over E Br Firesteel River | 2021 | 1,425 | Good |
| M-26 over W Br Firesteel River | 2021 | 1,425 | Good |
| M-28 over Match Creek Buried | 1936 | 1,331 | Fair |
| M-28 over W Br Ontonagon River | 1965 | 1,331 | Fair |
| M-38 over Flintsteel River | 1971 | 1,311 | Fair |
| M-64 over Mineral River | 1939 | 1,175 | Fair |
| Platzke Road over Clear Creek | 1963 | 1,122 | Fair |
| US-45 over Baltimore River | 1934 | 1,122 | Fair |
| M-64 over Halfway Creek | 1968 | 1,032 | Fair |
| M-64 over Little Cranberry River | 1948 | 1,032 | Fair |
| M-64 over Pine River | 1968 | 1,032 | Poor |
| M-64 over Townline Creek | 1968 | 1,032 | Fair |
| M-64 over Duck Creek | 1968 | 875 | Good |
| M-64 over Mineral River | 1941 | 875 | Fair |
| Old M-107 over Big Iron River | 1938 | 831 | Poor |
| Old M-107 over Little Iron River | 1967 | 831 | Poor |
| Old M-107 over Union River | 1976 | 831 | Poor |
| M-38 over W Br of Firesteel River | 1958 | 754 | Fair |
| M-64 over Sleepy Creek | 1960 | 743 | Fair |
| M-64 over Mineral River | 1954 | 500 | Fair |
| 1 Mile Rd over Mile and Half Creek | 2024 | 400 | Good |
| Bond Falls Road over Mid Br Ontonagon River | 1940 | 400 | Poor |
| Main St over Mineral River | 1955 | 250 | Poor |
| Firesteel Road over Flintsteel River | 1999 | 240 | Good |
| Lake Shore Road over Paddys Creek | 1976 | 240 | Good |
| Lake Shore Drive over Flintsteel River | 1980 | 200 | Good |
| Gardner Road FH55 over Trout Creek | 1982 | 180 | Fair |
| Mcrae Road over S Br Ontonagon River | 1988 | 180 | Good |
| Gardner Road over Mud Creek | 1992 | 150 | Good |
| Hokens Road over Ten Mile Creek | 1988 | 150 | Good |
| Hoop and Holler Rd over Merriweather Creek | 1983 | 150 | Good |
| Norwich Road FH53 over Deer Creek | 1987 | 150 | Good |
| Two Mile Rd FH54 over Sucker Creek | 1986 | 150 | Good |
| Victoria Road over Ontonagon River | 1977 | 150 | Fair |
| Lakeshore Drive over Firesteel River | 1976 | 120 | Poor |
| Norwich Road FH53 over W Br Ontonagon River | 1994 | 110 | Fair |
| Gardner Road over E Branch Ontonogon River | 1954 | 100 | Poor |
| Sleepy Hollow FH54 over Bluff Creek | 1985 | 100 | Fair |
| Butterfield Lk Rd over Black Creek | 2022 | 50 | Good |
| Forest Road 360 over Iron River | 1972 | 50 | Fair |
| Forest Road 400 over Cascade Creek | 1963 | 50 | Fair |
| Forest Road 5250 over M Br Ontonagon River | 1954 | 50 | Fair |
| Forest Road 6930 over Cisco Br Ontonagon River | 1951 | 50 | Fair |
| Kangas Road over W Br Firesteel River | 2009 | 50 | Good |
| Old M-28 over Ten Mile Creek | 2011 | 50 | Good |
| Wilderness Drive over Firesteel River | 2009 | 50 | Good |
| Kitzman Road over Mill Creek Diamond Creek | 1993 | 25 | Fair |
| Beck Road over Flintsteel River | 1987 | 10 | Good |
| Fr 210 over Nuthatch Creek | 2010 | 6 | Good |