Structure 10589 · Tuscola County, MI
Carries Merry Road over Allen Extn Drain, Sec 15 Fairgrove Twp.
A culvert 22 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 | Tuscola |
| Location | Sec 15 Fairgrove Twp |
| Carries | Merry Road |
| Crosses | Allen Extn Drain |
| Coordinates | 43.52935, -83.51374 |
| Material | Steel |
| Design | Culvert |
| Total Length | 21.7 ft (6.6 m) |
| Max Span | 21.7 ft (6.6 m) |
| Deck Area | 56.1 sq m |
| Main Spans | 1 |
| Year Built | 1979 |
| Avg Daily Traffic | 330 (2009) |
| Lanes On Bridge | 2 |
| Last Inspection | May 2023 |
| Inspection Frequency | Every 24 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 3 — Scour critical |
| Structure Number | 000000000010589 |
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.