Il 171 SB Rmp I-55 over Des Plaines River
Fair Condition62 years old10,500 vehicles/day
Location
| State | Illinois |
| County | Cook |
| Location | 1.5 M SW Il 43 |
| Carries | Il 171 SB Rmp I-55 |
| Crosses | Des Plaines River |
| Coordinates | 41.79384, -87.82480 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 5 (Fair) |
| Substructure | 7 (Good) |
| Channel/Waterway | 6 (Satisfactory) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Steel Continuous |
| Design | Stringer/Multi-beam |
| Total Length | 687.7 ft (209.6 m) |
| Max Span | 102.0 ft (31.1 m) |
| Deck Width | 29.2 ft (8.9 m) |
| Deck Area | 1865.4 sq m |
| Main Spans | 7 |
| Year Built | 1964 (reconstructed 2014) |
Traffic
| Avg Daily Traffic | 10,500 (2024) |
| Truck Traffic | 11% |
| Lanes On Bridge | 1 |
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 | 016102600000000 |