Structure 63200500000000 · Mason County, IL
Carries Ill 29 over Allens Grove Ditch, .5mi S Jct Us136& 29.
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 | Illinois |
| County | Mason |
| Location | .5mi S Jct Us136& 29 |
| Carries | Ill 29 |
| Crosses | Allens Grove Ditch |
| Coordinates | 40.29755, -89.69676 |
| Material | Concrete |
| Design | Culvert |
| Total Length | 20.7 ft (6.3 m) |
| Max Span | 9.8 ft (3 m) |
| Deck Area | 80.6 sq m |
| Main Spans | 2 |
| Year Built | 1959 |
| Avg Daily Traffic | 2,450 (2023) |
| Truck Traffic | 30% |
| Lanes On Bridge | 2 |
| Last Inspection | July 2024 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | 063200500000000 |
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.