Il 57 over Harkness Creek
Fair Condition85 years old4,150 vehicles/day
Location
| State | Illinois |
| County | Adams |
| Location | At Bluff Hall |
| Carries | Il 57 |
| Crosses | Harkness Creek |
| Coordinates | 39.81687, -91.34059 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 5 (Fair) |
| Superstructure | 5 (Fair) |
| Substructure | 6 (Satisfactory) |
| Channel/Waterway | 5 (Fair) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Concrete |
| Design | Tee Beam |
| Total Length | 32.2 ft (9.8 m) |
| Max Span | 30.8 ft (9.4 m) |
| Deck Width | 40.4 ft (12.3 m) |
| Deck Area | 120.5 sq m |
| Main Spans | 1 |
| Year Built | 1941 |
Traffic
| Avg Daily Traffic | 4,150 (2023) |
| Truck Traffic | 17% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 424 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 001001600000000 |