IRR BIA RTE 21 over Rock Creek
Good Condition55 years old203 vehicles/day
Location
| State | South Dakota |
| County | Corson |
| Location | In Bullhead South Dakota |
| Carries | IRR BIA RTE 21 |
| Crosses | Rock Creek |
| Coordinates | 45.76866, -101.08243 |
Condition Ratings
| Overall Condition | Good |
| Deck | 7 (Good) |
| Superstructure | 7 (Good) |
| Substructure | 7 (Good) |
| Channel/Waterway | 5 (Fair) |
| Scour Critical | 5 — Stable for scour |
Physical Characteristics
| Material | Concrete Continuous |
| Design | Slab |
| Total Length | 106.0 ft (32.3 m) |
| Max Span | 40.0 ft (12.2 m) |
| Deck Width | 32.8 ft (10 m) |
| Deck Area | 323 sq m |
| Main Spans | 3 |
| Year Built | 1971 |
Traffic
| Avg Daily Traffic | 203 (2023) |
| Truck Traffic | 5% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 523 |
| Inspection Frequency | Every 24 months |
| Owner | Bureau of Indian Affairs |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 00000000000A042 |