IRR BIA RTE 121 over Big Spring Creek
GoodRoberts County, South Dakota · 18.2 KM SW of Sisseton · Structure no. 0000A09347B0105
- Built
- 2018
- 7 years old
- Condition
- Good
- inspected April 2024
- Type
- Culvert
- Concrete
- Length
- 20 ft
- 1 main span
- Daily traffic
- 75
- 2024 count
- Owner
- Federal
- Bureau of Indian Affairs
About this bridge
IRR BIA RTE 121 over Big Spring Creek is a concrete culvert carrying IRR BIA RTE 121 over Big Spring Creek in Roberts County, South Dakota. It was built in 2018, so it is 7 years old, younger 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 75 vehicles a day, roughly 5% of them trucks, projected to reach 88 by 2044. The structure is 20 ft (6.2 m) long and 24 ft wide. If it were closed, the detour would be 123.7 mi (199 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 |
|---|---|---|
| Channel and channel protection | 7 Good | Some minor problems. |
| Culvert | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was IRR BIA RTE 121 over Big Spring Creek built?
It was built in 2018, making it 7 years old in 2025.
What condition is IRR BIA RTE 121 over Big Spring 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 April 2024.
How much traffic does IRR BIA RTE 121 over Big Spring Creek carry?
About 75 vehicles per day (2024 count), of which roughly 5% are trucks.
How long is IRR BIA RTE 121 over Big Spring Creek?
The structure is 20 ft (6.2 m) long with a longest span of 20 ft (6.2 m) and a deck 24 ft wide.
Who owns IRR BIA RTE 121 over Big Spring Creek?
It is owned by the Bureau of Indian Affairs.