Structure 57460900000000 · McLean County, IL
Carries Ch 6 over Mackinaw River, 4.8 Mi SW Gridley.
Set by its lowest-rated component: Deck and Superstructure and Substructure at 7 of 9.
How ratings work24 ft end to end. 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 or the layout of the shorter spans, so those are drawn as typical for a slab bridge.
| State | Illinois |
| County | McLean |
| Location | 4.8 Mi SW Gridley |
| Carries | Ch 6 |
| Crosses | Mackinaw River |
| Coordinates | 40.67942, -88.94375 |
| Material | Concrete |
| Design | Slab |
| Total Length | 24.0 ft (7.3 m) |
| Max Span | 21.3 ft (6.5 m) |
| Deck Width | 28.2 ft (8.6 m) |
| Deck Area | 62.8 sq m |
| Main Spans | 1 |
| Year Built | 1963 |
| Avg Daily Traffic | 225 (2024) |
| Truck Traffic | 32% |
| Lanes On Bridge | 2 |
| Last Inspection | March 2024 |
| Inspection Frequency | Every 24 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | 057460900000000 |
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.