Ill 78 over Johnson Creek
Fair Condition42 years old1,700 vehicles/day
Location
| State | Illinois |
| County | Carroll |
| Location | 0.5 Mi S Jct Ill 40 |
| Carries | Ill 78 |
| Crosses | Johnson Creek |
| Coordinates | 42.07258, -89.97714 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 6 (Satisfactory) |
| Substructure | 8 (Very Good) |
| Channel/Waterway | 6 (Satisfactory) |
| Scour Critical | 5 — Stable for scour |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Box Beam - Multiple |
| Total Length | 74.5 ft (22.7 m) |
| Max Span | 70.9 ft (21.6 m) |
| Deck Width | 33.1 ft (10.1 m) |
| Deck Area | 229.3 sq m |
| Main Spans | 1 |
| Year Built | 1984 |
Traffic
| Avg Daily Traffic | 1,700 (2023) |
| Truck Traffic | 17% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 524 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 008003100000000 |