Tr 171 over Sleepy Hollow Branch
Good Condition37 years old50 vehicles/day
Location
| State | Illinois |
| County | Mason |
| Location | 3.5mi SW Mason City |
| Carries | Tr 171 |
| Crosses | Sleepy Hollow Branch |
| Coordinates | 40.17856, -89.76026 |
Condition Ratings
| Overall Condition | Good |
| Deck | 8 (Very Good) |
| Superstructure | 8 (Very Good) |
| Substructure | 8 (Very Good) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Box Beam - Multiple |
| Total Length | 54.1 ft (16.5 m) |
| Max Span | 51.5 ft (15.7 m) |
| Deck Width | 30.2 ft (9.2 m) |
| Deck Area | 151.8 sq m |
| Main Spans | 1 |
| Year Built | 1989 |
Traffic
| Avg Daily Traffic | 50 (2024) |
| Truck Traffic | 20% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 323 |
| Inspection Frequency | Every 48 months |
| Owner | Town/Township Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 063480300000000 |