Ill 177 over Silver CR Overflow W
Poor Condition65 years old7,000 vehicles/day
Location
| State | Illinois |
| County | St. Clair |
| Location | 2.3mi W Il 4 |
| Carries | Ill 177 |
| Crosses | Silver CR Overflow W |
| Coordinates | 38.49953, -89.83541 |
Condition Ratings
| Overall Condition | Poor |
| Deck | 4 (Poor) |
| Superstructure | 5 (Fair) |
| Substructure | 6 (Satisfactory) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 7 — Countermeasures installed |
Physical Characteristics
| Material | Steel Continuous |
| Design | Stringer/Multi-beam |
| Total Length | 142.1 ft (43.3 m) |
| Max Span | 50.9 ft (15.5 m) |
| Deck Width | 35.8 ft (10.9 m) |
| Deck Area | 472.0 sq m |
| Main Spans | 3 |
| Year Built | 1961 |
Traffic
| Avg Daily Traffic | 7,000 (2023) |
| Truck Traffic | 5% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 724 |
| Inspection Frequency | Every 12 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 082006100000000 |