Slate Prairie Road over Castle Ck
Poor Condition76 years old73 vehicles/day
Location
| State | South Dakota |
| County | Pennington |
| Location | 0.5e 1.2n Deerfd Dam |
| Carries | Slate Prairie Road |
| Crosses | Castle Ck |
| Coordinates | 44.04649, -103.77297 |
Condition Ratings
| Overall Condition | Poor |
| Deck | 5 (Fair) |
| Superstructure | 7 (Good) |
| Substructure | 4 (Poor) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | Unknown |
Physical Characteristics
| Material | Wood or Timber |
| Design | Stringer/Multi-beam |
| Total Length | 25.9 ft (7.9 m) |
| Max Span | 24.0 ft (7.3 m) |
| Deck Width | 20.0 ft (6.1 m) |
| Deck Area | 48.2 sq m |
| Main Spans | 1 |
| Year Built | 1950 |
Traffic
| Avg Daily Traffic | 73 (2022) |
| Truck Traffic | 2% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 623 |
| Inspection Frequency | Every 24 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 000000052141325 |