Il 171 NB over Des Plaines River
Fair Condition62 years old40,100 vehicles/day
Location
| State | Illinois |
| County | Cook |
| Location | 0.2 M NW I-55 |
| Carries | Il 171 NB |
| Crosses | Des Plaines River |
| Coordinates | 41.79479, -87.82464 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 7 (Good) |
| Superstructure | 5 (Fair) |
| Substructure | 7 (Good) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Steel Continuous |
| Design | Stringer/Multi-beam |
| Total Length | 527.9 ft (160.9 m) |
| Max Span | 146.0 ft (44.5 m) |
| Deck Width | 43.3 ft (13.2 m) |
| Deck Area | 2123.9 sq m |
| Main Spans | 4 |
| Year Built | 1964 (reconstructed 2016) |
Traffic
| Avg Daily Traffic | 40,100 (2023) |
| Truck Traffic | 9% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 223 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 016098500000000 |