Byron Road over Shiawassee River
Shiawassee County, Michigan · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Byron Road over Shiawassee River in Shiawassee County, Michigan, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1994, making it 31 years old at the 2025 inventory.
- It carries about 2,452 vehicles a day (traffic count year 2010).
- Its listed owner is a city or municipal highway agency.
- It is one of 76 of the 163 inventoried bridges in Shiawassee County rated fair (46.6%); 15 (9.2%) 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 → (42.818, -83.94258)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 6 | Satisfactory condition |
| Superstructure | 7 | Good condition |
| Substructure | 7 | Good condition |
Bridge details
| Structure | Prestressed concrete multiple box beam |
| Length | about 100 ft |
| Location | In Village of Byron |
| NBI structure number | 000000000012660 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Michigan department of transportation.
Busiest bridges in Shiawassee County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-69 EB over Looking Glass River | 1961 | 192,000 | Fair |
| I-69 WB over Looking Glass River | 1961 | 192,000 | Fair |
| I-69 EB over Holly Drain | 1961 | 192,000 | Fair |
| I-69 WB over Holly Drain | 1961 | 192,000 | Fair |
| Britton Rd over I-69 | 1989 | 25,000 | Fair |
| M-21 over Shiawassee River | 1970 | 22,689 | Fair |
All bridges nearby: Shiawassee County, MI bridge conditions · every bridge in Shiawassee County · Michigan bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.