Keystone Road over Nippersink CR Trib
Good Condition36 years old1,300 vehicles/day
Location
| State | Illinois |
| County | McHenry |
| Location | 0.9 Mi S Tryon Grove |
| Carries | Keystone Road |
| Crosses | Nippersink CR Trib |
| Coordinates | 42.43169, -88.33966 |
Condition Ratings
| Overall Condition | Good |
| Channel/Waterway | 7 (Good) |
| Culvert | 8 (Very Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Steel |
| Design | Culvert |
| Total Length | 24.6 ft (7.5 m) |
| Max Span | 6.9 ft (2.1 m) |
| Deck Area | 54.8 sq m |
| Main Spans | 3 |
| Year Built | 1990 |
Traffic
| Avg Daily Traffic | 1,300 (2021) |
| Truck Traffic | 6% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | October 2024 |
| Inspection Frequency | Every 24 months |
| Owner | Town/Township Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 056303200000000 |