Structure 91002000001008 · Schoolcraft County, MI
Carries Usfs RTE 2173 over Little Indian River Br, 0.5 Mi S Big Island Lake.
A culvert 21 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 | Schoolcraft |
| Location | 0.5 Mi S Big Island Lake |
| Carries | Usfs RTE 2173 |
| Crosses | Little Indian River Br |
| Coordinates | 46.23036, -86.54958 |
| Material | Steel |
| Design | Culvert |
| Total Length | 21.0 ft (6.4 m) |
| Max Span | 8.2 ft (2.5 m) |
| Deck Area | 46.7 sq m |
| Main Spans | 2 |
| Year Built | 1963 |
| Avg Daily Traffic | 75 (1975) |
| 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 | 091002000001008 |
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.