I-39 & US 51 NB over Kishwaukee River
Fair Condition45 years old14,500 vehicles/day
Location
| State | Illinois |
| County | Winnebago |
| Location | 0.75 Mi S Blkhawk RD |
| Carries | I-39 & US 51 NB |
| Crosses | Kishwaukee River |
| Coordinates | 42.18122, -89.02361 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 6 (Satisfactory) |
| Substructure | 7 (Good) |
| Channel/Waterway | 8 (Very Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Segmental Box Girder |
| Total Length | 1163.1 ft (354.5 m) |
| Max Span | 250.0 ft (76.2 m) |
| Deck Width | 42.0 ft (12.8 m) |
| Deck Area | 4537.6 sq m |
| Main Spans | 5 |
| Year Built | 1981 (reconstructed 2008) |
Traffic
| Avg Daily Traffic | 14,500 (2023) |
| Truck Traffic | 37% |
| 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 | 101013400000000 |