Tr-1a over Trib Harper Creek
Good Condition28 years old450 vehicles/day
Location
| State | Illinois |
| County | Jefferson |
| Location | 2 Mi N Mt Vernon |
| Carries | Tr-1a |
| Crosses | Trib Harper Creek |
| Coordinates | 38.36915, -88.94537 |
Condition Ratings
| Overall Condition | Good |
| Channel/Waterway | 5 (Fair) |
| Culvert | 7 (Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Concrete |
| Design | Culvert |
| Total Length | 23.6 ft (7.2 m) |
| Max Span | 11.5 ft (3.5 m) |
| Deck Area | 48.2 sq m |
| Main Spans | 2 |
| Year Built | 1998 |
Traffic
| Avg Daily Traffic | 450 (2021) |
| Truck Traffic | 16% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 124 |
| Inspection Frequency | Every 24 months |
| Owner | Town/Township Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 041506100000000 |