Structure 16221000000000 · Cook County, IL
Carries US 45/il21 over Ditch, 300 S Of Lake Cook.
A culvert 23 ft across with 3 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 | Cook |
| Location | 300 S Of Lake Cook |
| Carries | US 45/il21 |
| Crosses | Ditch |
| Coordinates | 42.15229, -87.91460 |
| Material | Concrete Continuous |
| Design | Culvert |
| Total Length | 23.3 ft (7.1 m) |
| Max Span | 7.5 ft (2.3 m) |
| Deck Area | 233.6 sq m |
| Main Spans | 3 |
| Year Built | 1993 |
| Avg Daily Traffic | 30,200 (2023) |
| Truck Traffic | 4% |
| Lanes On Bridge | 6 |
| Last Inspection | October 2022 |
| Inspection Frequency | Every 48 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | 016221000000000 |
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.