Tin Shanty Road over Black River
Otsego County, Michigan · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Tin Shanty Road over Black River in Otsego 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 1999, making it 26 years old at the 2025 inventory.
- It carries about 150 vehicles a day (traffic count year 2013).
- Its listed owner is the county highway agency.
- It is one of 20 of the 25 inventoried bridges in Otsego County rated fair (80.0%); 2 (8.0%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- It was rated good in the 2024 inventory and is now fair (culvert 7 to 6).
- Its most recent inspection on record is dated July 2024, on a 24-month routine inspection cycle.
- 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 → (45.12679, -84.40766)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Culvert | 7 | 6 | Satisfactory condition |
Bridge details
| Structure | Steel culvert |
| Length | about 23 ft |
| Location | 2 Mi S of Sturgeon Valley |
| NBI structure number | 000000000013909 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | July 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | U: unknown foundation, not evaluated for scour |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Michigan department of transportation.
Busiest bridges in Otsego County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-75 Bl|old 27 over I-75 NB | 1961 | 12,725 | Fair |
| I-75 SB over Charles Brink Rd | 1961 | 7,041 | Fair |
| I-75 NB over Charles Brink Rd | 1961 | 7,041 | Fair |
| I-75 NB over Lake State RR | 1962 | 6,791 | Fair |
| I-75 SB over Lake State RR | 1962 | 6,791 | Fair |
| I-75 SB over M-32|w Main St | 1961 | 6,791 | Poor |
All bridges nearby: Otsego County, MI bridge conditions · every bridge in Otsego County · Michigan bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.