Derby St over Grand Trunk Western RR
Oakland County, Michigan · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Derby St over Grand Trunk Western RR in Oakland County, Michigan, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- It was built in 1930 and reconstructed in 2007, making it 95 years old at the 2025 inventory.
- It carries about 1,952 vehicles a day (traffic count year 1988).
- Its listed owner is a city or municipal highway agency.
- A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.
View this bridge on a map → (42.55429, -83.20304)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 4 | Poor condition |
| Superstructure | 4 | Poor condition |
| Substructure | 5 | Fair condition |
Bridge details
| Structure | Concrete tee beam |
| Length | about 165 ft |
| Location | 0.9 Mi W of Coolidge Hwy |
| NBI structure number | 000000000008230 |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Michigan department of transportation.
All bridges nearby: Oakland County, MI bridge conditions · Michigan bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.