I-39/US 51 over Mackinaw River
Fair Condition37 years old18,700 vehicles/day
Location
| State | Illinois |
| County | McLean |
| Location | 8.8 Mi N Of I-55 |
| Carries | I-39/US 51 |
| Crosses | Mackinaw River |
| Coordinates | 40.66284, -89.00519 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 7 (Good) |
| Substructure | 7 (Good) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 5 — Stable for scour |
Physical Characteristics
| Material | Steel Continuous |
| Design | Stringer/Multi-beam |
| Total Length | 431.8 ft (131.6 m) |
| Max Span | 163.1 ft (49.7 m) |
| Deck Width | 93.2 ft (28.4 m) |
| Deck Area | 3737.4 sq m |
| Main Spans | 3 |
| Year Built | 1989 |
Traffic
| Avg Daily Traffic | 18,700 (2023) |
| Truck Traffic | 37% |
| Lanes On Bridge | 4 |
Inspection & Ownership
| Last Inspection | 324 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 057020300000000 |