Ill 177 over Silver Creek
Fair Condition65 years old7,000 vehicles/day
Location
| State | Illinois |
| County | St. Clair |
| Location | Wcl Mascoutah |
| Carries | Ill 177 |
| Crosses | Silver Creek |
| Coordinates | 38.49692, -89.82820 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 5 (Fair) |
| Superstructure | 6 (Satisfactory) |
| Substructure | 6 (Satisfactory) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Steel Continuous |
| Design | Stringer/Multi-beam |
| Total Length | 268.0 ft (81.7 m) |
| Max Span | 50.9 ft (15.5 m) |
| Deck Width | 35.4 ft (10.8 m) |
| Deck Area | 882.4 sq m |
| Main Spans | 6 |
| 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 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 082006300000000 |