Structure 3120 · Gratiot County, MI
Carries M-57 over County Drain, 1.0 Mi SE Of Ashley.
25 ft end to end. Lengths are drawn to scale; at this length a semi-truck would be a speck. Each part is colored by its latest inspection rating. The inventory records lengths but not heights or the layout of the shorter spans, so those are drawn as typical for a multi-beam bridge.
| State | Michigan |
| County | Gratiot |
| Location | 1.0 Mi SE Of Ashley |
| Carries | M-57 |
| Crosses | County Drain |
| Coordinates | 43.17587, -84.45771 |
| Material | Steel |
| Design | Stringer/Multi-beam |
| Total Length | 24.9 ft (7.6 m) |
| Max Span | 23.6 ft (7.2 m) |
| Deck Width | 41.0 ft (12.5 m) |
| Deck Area | 95 sq m |
| Main Spans | 1 |
| Year Built | 1939 (reconstructed 2006) |
| Avg Daily Traffic | 3,942 (2007) |
| Truck Traffic | 14% |
| Lanes On Bridge | 2 |
| Last Inspection | September 2024 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 3 — Scour critical |
| Structure Number | 000000000003120 |
Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."
A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.