Il 171 NB over 47th ST
Good Condition58 years old40,100 vehicles/day
Location
| State | Illinois |
| County | Cook |
| Location | 1.3 M N I-55 |
| Carries | Il 171 NB |
| Crosses | 47th ST |
| Coordinates | 41.80580, -87.83329 |
Condition Ratings
| Overall Condition | Good |
| Deck | 8 (Very Good) |
| Superstructure | 7 (Good) |
| Substructure | 7 (Good) |
| Scour Critical | Not applicable |
Physical Characteristics
| Material | Steel Continuous |
| Design | Stringer/Multi-beam |
| Total Length | 176.8 ft (53.9 m) |
| Max Span | 98.4 ft (30 m) |
| Deck Width | 44.0 ft (13.4 m) |
| Deck Area | 722.3 sq m |
| Main Spans | 3 |
| Year Built | 1968 (reconstructed 2015) |
Traffic
| Avg Daily Traffic | 40,100 (2023) |
| Truck Traffic | 9% |
| Lanes On Bridge | 2 |
| Lanes Under Bridge | 6 |
Inspection & Ownership
| Last Inspection | October 2021 |
| Inspection Frequency | Every 48 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 016100100000000 |