IRR Ar Sd020 over Lyon Ck
Fair Condition64 years old125 vehicles/day
Location
| State | South Dakota |
| County | Perkins |
| Location | 0.9 W Ziebach Co Line |
| Carries | IRR Ar Sd020 |
| Crosses | Lyon Ck |
| Coordinates | 45.44343, -102.01641 |
Condition Ratings
| Overall Condition | Fair |
| Channel/Waterway | 8 (Very Good) |
| Culvert | 6 (Satisfactory) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Concrete Continuous |
| Design | Culvert |
| Total Length | 24.6 ft (7.5 m) |
| Max Span | 12.1 ft (3.7 m) |
| Deck Area | 68.2 sq m |
| Main Spans | 2 |
| Year Built | 1962 |
Traffic
| Avg Daily Traffic | 125 (2024) |
| Truck Traffic | 27% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 723 |
| Inspection Frequency | Every 48 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 000000053454350 |