Il 171 (1st Ave) over Des Plaines River
Fair Condition95 years old20,100 vehicles/day
Location
| State | Illinois |
| County | Cook |
| Location | 0.7 M N Il 64 |
| Carries | Il 171 (1st Ave) |
| Crosses | Des Plaines River |
| Coordinates | 41.91907, -87.83534 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 7 (Good) |
| Substructure | 7 (Good) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Stringer/Multi-beam |
| Total Length | 193.6 ft (59 m) |
| Max Span | 65.9 ft (20.1 m) |
| Deck Width | 63.0 ft (19.2 m) |
| Deck Area | 1132.8 sq m |
| Main Spans | 3 |
| Year Built | 1931 (reconstructed 1980) |
Traffic
| Avg Daily Traffic | 20,100 (2023) |
| Truck Traffic | 4% |
| Lanes On Bridge | 4 |
Inspection & Ownership
| Last Inspection | December 2023 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 016069700000000 |