Michigan County Bridge Report Cards
Compare county Bridge Condition Exposure Scores in Michigan by condition, traffic exposure, scour-critical bridges, average age, and data completeness. View the scoring methodology.
| County | Grade | Score | Poor | Poor Traffic | Scour-Critical | Avg Age |
|---|---|---|---|---|---|---|
| Iron County | F | 14 | 22.2% | 15,459/day | 12 | 57 yrs |
| Gogebic County | F | 26 | 21.6% | 12,078/day | 19 | 57 yrs |
| Washtenaw County | F | 32 | 17.9% | 467,886/day | 31 | 50 yrs |
| Arenac County | F | 36 | 15.0% | 41,344/day | 9 | 56 yrs |
| Dickinson County | F | 36 | 16.7% | 7,098/day | 11 | 48 yrs |
| Branch County | F | 36 | 22.0% | 19,996/day | 10 | 52 yrs |
| Ontonagon County | F | 37 | 15.2% | 7,888/day | 7 | 54 yrs |
| Benzie County | F | 37 | 28.0% | 2,539/day | 2 | 56 yrs |
| Oscoda County | F | 37 | 20.0% | 969/day | 3 | 36 yrs |
| Barry County | F | 38 | 21.7% | 2,970/day | 8 | 48 yrs |
| Gratiot County | F | 39 | 13.2% | 67,873/day | 35 | 50 yrs |
| Calhoun County | F | 39 | 17.4% | 83,634/day | 25 | 52 yrs |
| Allegan County | F | 40 | 16.7% | 82,809/day | 24 | 47 yrs |
| Midland County | F | 40 | 17.1% | 38,482/day | 21 | 47 yrs |
| Bay County | F | 40 | 16.3% | 83,031/day | 22 | 51 yrs |
| Alger County | F | 40 | 13.2% | 3,678/day | 7 | 70 yrs |
| Saginaw County | F | 40 | 18.4% | 54,819/day | 38 | 47 yrs |
| Sanilac County | F | 41 | 14.7% | 21,944/day | 22 | 47 yrs |
| Genesee County | F | 41 | 14.4% | 477,257/day | 80 | 56 yrs |
| Lake County | F | 42 | 16.1% | 496/day | 3 | 61 yrs |
| Isabella County | F | 43 | 14.2% | 44,179/day | 17 | 43 yrs |
| Cass County | F | 43 | 15.1% | 5,686/day | 8 | 56 yrs |
| Ingham County | F | 44 | 12.4% | 430,469/day | 23 | 53 yrs |
| Antrim County | F | 44 | 13.3% | 3,704/day | 3 | 45 yrs |
| Hillsdale County | F | 44 | 14.4% | 8,329/day | 21 | 50 yrs |
| Alcona County | F | 45 | 18.5% | 3,338/day | 1 | 43 yrs |
| Mackinac County | F | 46 | 15.9% | 17,739/day | 1 | 58 yrs |
| Clinton County | F | 46 | 15.8% | 27,437/day | 40 | 50 yrs |
| Marquette County | F | 47 | 12.9% | 16,076/day | 35 | 52 yrs |
| Manistee County | F | 47 | 14.3% | 3,076/day | 4 | 46 yrs |
| Monroe County | F | 48 | 13.4% | 166,226/day | 51 | 50 yrs |
| Crawford County | F | 50 | 10.9% | 24,178/day | 4 | 54 yrs |
| Livingston County | F | 51 | 13.9% | 203,930/day | 11 | 52 yrs |
| Jackson County | F | 52 | 10.8% | 106,601/day | 25 | 48 yrs |
| Ionia County | F | 54 | 10.2% | 36,169/day | 11 | 51 yrs |
| Luce County | F | 54 | 14.3% | 609/day | 2 | 41 yrs |
| Lenawee County | F | 55 | 11.6% | 63,638/day | 13 | 44 yrs |
| Shiawassee County | F | 59 | 9.2% | 52,246/day | 21 | 44 yrs |
| Menominee County | F | 59 | 9.4% | 3,099/day | 21 | 48 yrs |
| Presque Isle County | F | 59 | 10.8% | 642/day | 3 | 53 yrs |
| Gladwin County | D | 60 | 6.3% | 7,400/day | 12 | 45 yrs |
| St. Joseph County | D | 60 | 12.1% | 19,417/day | 6 | 46 yrs |
| Huron County | D | 60 | 7.3% | 8,419/day | 24 | 49 yrs |
| Iosco County | D | 61 | 6.4% | 7,683/day | 13 | 51 yrs |
| Ottawa County | D | 61 | 9.1% | 88,248/day | 23 | 49 yrs |
| Muskegon County | D | 61 | 11.2% | 30,962/day | 8 | 57 yrs |
| Osceola County | D | 62 | 6.8% | 15,442/day | 13 | 43 yrs |
| Chippewa County | D | 62 | 11.6% | 6,313/day | 6 | 50 yrs |
| Alpena County | D | 62 | 6.2% | 3,011/day | 8 | 56 yrs |
| Wayne County | D | 63 | 11.2% | 1,618,543/day | 36 | 54 yrs |
| Lapeer County | D | 63 | 8.0% | 48,776/day | 13 | 42 yrs |
| Cheboygan County | D | 63 | 13.7% | 7,105/day | 2 | 51 yrs |
| Charlevoix County | D | 63 | 11.1% | 1,283/day | 1 | 53 yrs |
| Tuscola County | D | 66 | 4.1% | 20,027/day | 34 | 46 yrs |
| Schoolcraft County | D | 66 | 5.4% | 70/day | 12 | 56 yrs |
| Baraga County | D | 68 | 7.4% | 9,652/day | 2 | 37 yrs |
| Otsego County | D | 69 | 8.0% | 13,582/day | 0 | 49 yrs |
| Missaukee County | D | 69 | 10.3% | 2,647/day | 1 | 47 yrs |
| Newaygo County | D | 69 | 9.1% | 875/day | 4 | 46 yrs |
| Kent County | C | 70 | 5.5% | 696,520/day | 30 | 50 yrs |
| Eaton County | C | 70 | 5.4% | 41,006/day | 17 | 47 yrs |
| Ogemaw County | C | 70 | 3.2% | 643/day | 3 | 56 yrs |
| Montcalm County | C | 71 | 5.8% | 1,108/day | 10 | 49 yrs |
| Wexford County | C | 72 | 7.8% | 12,981/day | 3 | 40 yrs |
| Grand Traverse County | C | 73 | 6.1% | 24,431/day | 1 | 55 yrs |
| Macomb County | C | 73 | 7.2% | 188,583/day | 22 | 45 yrs |
| Van Buren County | C | 75 | 8.5% | 18,687/day | 3 | 50 yrs |
| Oakland County | C | 75 | 6.8% | 379,102/day | 24 | 43 yrs |
| Mecosta County | C | 75 | 3.8% | 1,458/day | 7 | 43 yrs |
| Oceana County | C | 77 | 5.0% | 9,489/day | 5 | 48 yrs |
| St. Clair County | C | 77 | 9.5% | 40,068/day | 3 | 40 yrs |
| Keweenaw County | C | 77 | 8.3% | 128/day | 0 | 62 yrs |
| Mason County | C | 78 | 6.1% | 774/day | 3 | 49 yrs |
| Roscommon County | C | 78 | 0.0% | 0/day | 4 | 55 yrs |
| Kalamazoo County | C | 79 | 7.2% | 69,388/day | 2 | 41 yrs |
| Berrien County | C | 79 | 6.3% | 29,096/day | 9 | 46 yrs |
| Clare County | B | 83 | 4.2% | 1,620/day | 4 | 42 yrs |
| Kalkaska County | B | 86 | 6.7% | 19/day | 0 | 50 yrs |
| Emmet County | B | 89 | 2.6% | 1,001/day | 1 | 36 yrs |
| Houghton County | A | 90 | 3.4% | 90/day | 1 | 41 yrs |
| Montmorency County | A | 90 | 0.0% | 0/day | 1 | 30 yrs |
| Delta County | A | 95 | 0.0% | 0/day | 2 | 50 yrs |