Usfs Rte 3108 over Little Brevoort River
Mackinac County, Michigan · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Usfs Rte 3108 over Little Brevoort River in Mackinac County, Michigan, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1979, making it 46 years old at the 2025 inventory.
- It carries about 175 vehicles a day (traffic count year 1998).
- It is one of 36 of the 63 inventoried bridges in Mackinac County rated fair (57.1%); 10 (15.9%) are rated poor.
- A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.
View this bridge on a map → (46.01303, -84.9845)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 6 | Satisfactory condition |
Bridge details
| Structure | Steel culvert |
| Length | about 23 ft |
| Location | 1.7 Mi N US-2 |
| NBI structure number | 091005000001042 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Michigan department of transportation.
Busiest bridges in Mackinac 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 |
All bridges nearby: Mackinac County, MI bridge conditions · every bridge in Mackinac County · Michigan bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.