IRR BIA RTE 21 over Rock Creek
GoodCorson County, South Dakota · In Bullhead South Dakota · Structure no. 00000000000A042
- Built
- 1971
- 54 years old
- Condition
- Good
- inspected May 2023
- Type
- Slab
- Concrete Continuous
- Length
- 106 ft
- 3 main spans
- Daily traffic
- 203
- 2023 count
- Owner
- Federal
- Bureau of Indian Affairs
About this bridge
IRR BIA RTE 21 over Rock Creek is a concrete continuous slab carrying IRR BIA RTE 21 over Rock Creek in Corson County, South Dakota. It was built in 1971, so it is 54 years old, older than the South Dakota average of 48.9 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 203 vehicles a day, roughly 5% of them trucks, projected to reach 315 by 2043. The structure is 106 ft (32.3 m) long and 33 ft wide. If it were closed, the detour would be 29.8 mi (48 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was IRR BIA RTE 21 over Rock Creek built?
It was built in 1971, making it 54 years old in 2025.
What condition is IRR BIA RTE 21 over Rock Creek in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2023.
How much traffic does IRR BIA RTE 21 over Rock Creek carry?
About 203 vehicles per day (2023 count), of which roughly 5% are trucks.
How long is IRR BIA RTE 21 over Rock Creek?
The structure is 106 ft (32.3 m) long with a longest span of 40 ft (12.2 m) and a deck 33 ft wide.
Who owns IRR BIA RTE 21 over Rock Creek?
It is owned by the Bureau of Indian Affairs.