Il 171 (1st Ave) over Salt Creek
Good Condition95 years old36,500 vehicles/day
Location
| State | Illinois |
| County | Cook |
| Location | 0.2 M N US 34 |
| Carries | Il 171 (1st Ave) |
| Crosses | Salt Creek |
| Coordinates | 41.81839, -87.83346 |
Condition Ratings
| Overall Condition | Good |
| Deck | 7 (Good) |
| Superstructure | 7 (Good) |
| Substructure | 7 (Good) |
| Channel/Waterway | 6 (Satisfactory) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Prestressed Concrete Continuous |
| Design | Stringer/Multi-beam |
| Total Length | 113.8 ft (34.7 m) |
| Max Span | 54.1 ft (16.5 m) |
| Deck Width | 59.7 ft (18.2 m) |
| Deck Area | 631.5 sq m |
| Main Spans | 2 |
| Year Built | 1931 (reconstructed 1984) |
Traffic
| Avg Daily Traffic | 36,500 (2023) |
| Truck Traffic | 7% |
| Lanes On Bridge | 4 |
Inspection & Ownership
| Last Inspection | 823 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 016070200000000 |