Structure 10230 · St. Clair County, MI
Carries Richman Road over Holland Drain, Sec. 5-6 ST Clair Twp..
A culvert 24 ft across. 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 | St. Clair |
| Location | Sec. 5-6 ST Clair Twp. |
| Carries | Richman Road |
| Crosses | Holland Drain |
| Coordinates | 42.88833, -82.59877 |
| Material | Aluminum/Wrought Iron/Cast Iron |
| Design | Culvert |
| Total Length | 24.3 ft (7.4 m) |
| Max Span | 24.3 ft (7.4 m) |
| Deck Area | 67.3 sq m |
| Main Spans | 1 |
| Year Built | 2018 |
| Avg Daily Traffic | 194 (2017) |
| Truck Traffic | 5% |
| Lanes On Bridge | 2 |
| Last Inspection | July 2023 |
| Inspection Frequency | Every 24 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 5 — Stable for scour |
| Structure Number | 000000000010230 |
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.