M-21 over Swartz Creek
Fair Condition108 years old12,900 vehicles/day
Location
| State | Michigan |
| County | Genesee |
| Location | In Flint |
| Carries | M-21 |
| Crosses | Swartz Creek |
| Coordinates | 43.00814, -83.69761 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 6 (Satisfactory) |
| Substructure | 5 (Fair) |
| Channel/Waterway | 6 (Satisfactory) |
| Scour Critical | 3 — Scour critical |
Physical Characteristics
| Material | Concrete |
| Design | Arch - Deck |
| Total Length | 62.0 ft (18.9 m) |
| Max Span | 59.7 ft (18.2 m) |
| Deck Width | 62.3 ft (19 m) |
| Deck Area | 359.1 sq m |
| Main Spans | 1 |
| Year Built | 1918 |
Traffic
| Avg Daily Traffic | 12,900 (2009) |
| Truck Traffic | 2% |
| Lanes On Bridge | 4 |
Inspection & Ownership
| Last Inspection | October 2024 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is on the National Register of Historic Places |
| Structure Number | 000000000002573 |