Il 173 over Piscasaw Creektrib.
Good Condition25 years old5,000 vehicles/day
Location
| State | Illinois |
| County | Boone |
| Location | At Mchenry Co. Ln. |
| Carries | Il 173 |
| Crosses | Piscasaw Creektrib. |
| Coordinates | 42.40069, -88.70622 |
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 | Concrete Continuous |
| Design | Slab |
| Total Length | 89.9 ft (27.4 m) |
| Max Span | 35.1 ft (10.7 m) |
| Deck Width | 38.7 ft (11.8 m) |
| Deck Area | 323.3 sq m |
| Main Spans | 3 |
| Year Built | 2001 |
Traffic
| Avg Daily Traffic | 5,000 (2023) |
| Truck Traffic | 11% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 422 |
| Inspection Frequency | Every 48 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 004001800000000 |