Il 78 over Rock River
Fair Condition32 years old2,950 vehicles/day
Location
| State | Illinois |
| County | Whiteside |
| Location | N Edge Prophetstown |
| Carries | Il 78 |
| Crosses | Rock River |
| Coordinates | 41.68779, -89.93792 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 7 (Good) |
| Superstructure | 7 (Good) |
| Substructure | 6 (Satisfactory) |
| Channel/Waterway | 6 (Satisfactory) |
| Scour Critical | 5 — Stable for scour |
Physical Characteristics
| Material | Steel |
| Design | Stringer/Multi-beam |
| Total Length | 805.8 ft (245.6 m) |
| Max Span | 194.9 ft (59.4 m) |
| Deck Width | 43.3 ft (13.2 m) |
| Deck Area | 3241.9 sq m |
| Main Spans | 5 |
| Year Built | 1994 |
Traffic
| Avg Daily Traffic | 2,950 (2023) |
| Truck Traffic | 15% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 623 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 098010000000000 |