Horse Mill Road over Thorofare Canal
Wayne County, Michigan · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Horse Mill Road over Thorofare Canal in Wayne County, Michigan, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1937 and reconstructed in 2000, making it 88 years old at the 2025 inventory.
- It carries about 1,338 vehicles a day (traffic count year 2001).
- Its listed owner is the county highway agency.
- It is one of 529 of the 1,035 inventoried bridges in Wayne County rated fair (51.1%); 116 (11.2%) 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 → (42.16309, -83.14811)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 7 | Good condition |
| Superstructure | 8 | Very good condition |
| Substructure | 5 | Fair condition |
Bridge details
| Structure | Prestressed concrete multiple box beam |
| Length | about 82 ft |
| Location | Grosse Ile E/meridian |
| NBI structure number | 000000000012271 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Michigan department of transportation.
Busiest bridges in Wayne County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-94 over Gtw NS CR RR & Russel | 2000 | 180,032 | Good |
| I-94 over I-75 | 1962 | 180,032 | Fair |
| Rmp I-96E to I-75N over I-96 WB | 1970 | 179,000 | Fair |
| I-75 over Ramp to Davison(m-8) | 1969 | 166,750 | Fair |
| I-96 over Rouge River | 1970 | 164,804 | Good |
| I-75 over Conrail RR | 1969 | 152,325 | Good |
All bridges nearby: Wayne County, MI bridge conditions · every bridge in Wayne County · Michigan bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.