Bridge conditions in Mackinac County, Michigan
63 inventoried bridges · 10 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
About one in 6 bridges in Mackinac County is rated in poor condition: 10 of 63 on the federal inventory, one of the higher shares in Michigan.
- 10 of the 63 bridges in Mackinac County, Michigan, are rated in poor condition (15.9%) in the 2025 National Bridge Inventory, as of .
- 17 bridges (27.0%) are rated good and 36 (57.1%) fair.
- The median Mackinac County bridge was built in 1963.
- The busiest poor-rated bridge is US-2 over Canadian National RR (built 1938), carrying about 4,114 vehicles a day.
Good 27.0% · Fair 57.1% · Poor 15.9% of 63 bridges
Bridges rated poor
Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US-2 over Canadian National RR | 1938 | 4,114 | Poor |
| US-2 over Black River | 1939 | 3,586 | Poor |
| I-75 over Elmhirst Creek | 1963 | 3,016 | Poor |
| I-75 NB over Cheeseman Rd | 1960 | 2,555 | Poor |
| I-75 SB over Cheeseman Rd | 1960 | 2,555 | Poor |
| M-123 over I-75 NB | 1963 | 1,808 | Poor |
| Usfs Rte 3458 over Carp River | 1955 | 50 | Poor |
| Sherman Road over Shoe-pac River | 1980 | 30 | Poor |
| Usfs Rte 3445 over Carp River | 1962 | 15 | Poor |
| Orchard Hill Road over Hog Island Creek | 1997 | 10 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Us-2|i-75 Bl over I-75 NB | 1957 | 7,550 | Fair |
| US-2 over Cut River | 1947 | 4,450 | Fair |
| US-2 over Brevort River | 2019 | 4,400 | Good |
| I-75 SB over Carp River | 1964 | 4,400 | Fair |
| I-75 SB over Mackinac Trail | 1963 | 4,400 | Fair |
| I-75 Bl over I-75 NB | 1960 | 4,350 | Fair |
| US-2 over Canadian National RR | 1938 | 4,114 | Poor |
| US-2 over Millecoquin River | 1940 | 3,813 | Fair |
| US-2 over Hog Island Creek | 1939 | 3,668 | Fair |
| US-2 over Davenport Creek | 1939 | 3,668 | Fair |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of Michigan: Michigan bridge conditions by county · every download on the data page.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.