Structure 12006 · Wayne County, MI
Carries Grosse Ile Parkway over Trenton Channel, Grosse Ile.
1,346 ft end to end, longest span 170 ft: about 3.7 football fields. Lengths and the semi-truck on the deck are drawn to the same scale. 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 swing bridge (drawn closed).
| State | Michigan |
| County | Wayne |
| Location | Grosse Ile |
| Carries | Grosse Ile Parkway |
| Crosses | Trenton Channel |
| Coordinates | 42.12730, -83.17303 |
| Material | Steel Continuous |
| Design | Movable - Swing |
| Total Length | 1345.8 ft (410.2 m) |
| Max Span | 169.9 ft (51.8 m) |
| Deck Width | 31.8 ft (9.7 m) |
| Deck Area | 3978.9 sq m |
| Main Spans | 2 |
| Year Built | 1932 (reconstructed 2007) |
| Avg Daily Traffic | 22,180 (2007) |
| Truck Traffic | 2% |
| Lanes On Bridge | 2 |
| Last Inspection | June 2024 |
| Inspection Frequency | Every 12 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is on the National Register of Historic Places |
| Scour Critical | 4 — Foundations need monitoring |
| Structure Number | 000000000012006 |
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.