Structure 91005000001042 · Mackinac County, MI
Carries Usfs RTE 3108 over Little Brevoort River, 1.7 Mi N Us-2.
A culvert 24 ft across with 2 openings. 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, so those are drawn as typical for a culvert.
| State | Michigan |
| County | Mackinac |
| Location | 1.7 Mi N Us-2 |
| Carries | Usfs RTE 3108 |
| Crosses | Little Brevoort River |
| Coordinates | 46.01303, -84.98450 |
| Material | Steel |
| Design | Culvert |
| Total Length | 24.0 ft (7.3 m) |
| Max Span | 12.1 ft (3.7 m) |
| Deck Area | 53.3 sq m |
| Main Spans | 2 |
| Year Built | 1979 |
| Avg Daily Traffic | 175 (1998) |
| Truck Traffic | 10% |
| Lanes On Bridge | 2 |
| Last Inspection | October 2024 |
| Inspection Frequency | Every 24 months |
| Owner | U.S. Forest Service |
| Historical Significance | Historical significance is not determined |
| Scour Critical | 4 — Foundations need monitoring |
| Structure Number | 091005000001042 |
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.