Structure 12306 · Wayne County, MI
Carries Grosse Ile Toll Br over Trenton Channel, Bet.riverview & Gross-ile.
1,030 ft end to end: about 2.9 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 | Bet.riverview & Gross-ile |
| Carries | Grosse Ile Toll Br |
| Crosses | Trenton Channel |
| Coordinates | 42.17299, -83.16018 |
| Material | Steel Continuous |
| Design | Movable - Swing |
| Total Length | 1030.2 ft (314 m) |
| Max Span | 179.8 ft (54.8 m) |
| Deck Width | 24.6 ft (7.5 m) |
| Deck Area | 2,355 sq m |
| Main Spans | 1 |
| Year Built | 1913 |
| Lanes On Bridge | 2 |
| Last Inspection | August 2023 |
| Inspection Frequency | Every 24 months |
| Owner | Private |
| Historical Significance | Bridge is on the National Register of Historic Places |
| Scour Critical | 6 — Scour calculated, stable |
| Structure Number | 000000000012306 |
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.