IRR BIA RTE 12 over Little Cottonwood Creek
FairZiebach County, South Dakota · 10 KM NE of Cherry Creek · Structure no. 00000000000A013
- Built
- 1969
- 56 years old
- Condition
- Fair
- inspected May 2023
- Type
- Channel Beam
- Concrete
- Length
- 94 ft
- 3 main spans
- Daily traffic
- 205
- 2023 count
- Owner
- Federal
- Bureau of Indian Affairs
About this bridge
IRR BIA RTE 12 over Little Cottonwood Creek is a concrete channel beam carrying IRR BIA RTE 12 over Little Cottonwood Creek in Ziebach County, South Dakota. It was built in 1969, so it is 56 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 fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 205 vehicles a day, roughly 5% of them trucks, projected to reach 239 by 2043. The structure is 94 ft (28.7 m) long and 32 ft wide. If it were closed, the detour would be 69 mi (111 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 12 over Little Cottonwood Creek built?
It was built in 1969, making it 56 years old in 2025.
What condition is IRR BIA RTE 12 over Little Cottonwood Creek in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in May 2023.
How much traffic does IRR BIA RTE 12 over Little Cottonwood Creek carry?
About 205 vehicles per day (2023 count), of which roughly 5% are trucks.
How long is IRR BIA RTE 12 over Little Cottonwood Creek?
The structure is 94 ft (28.7 m) long with a longest span of 31 ft (9.4 m) and a deck 32 ft wide.
Who owns IRR BIA RTE 12 over Little Cottonwood Creek?
It is owned by the Bureau of Indian Affairs.