IRR US012 over Snake Ck
FairCorson County, South Dakota · 1.5 NW JCT Sd 20 · Structure no. 000000016689259
- Built
- 1966
- 59 years old
- Condition
- Fair
- inspected January 2025
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 143 ft
- 3 main spans
- Daily traffic
- 1,091
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
IRR US012 over Snake Ck is a steel continuous stringer/multi-beam or girder carrying IRR US012 over Snake Ck in Corson County, South Dakota. It was built in 1966, so it is 59 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 1,091 vehicles a day, roughly 20% of them trucks, projected to reach 1,425 by 2044. The structure is 143 ft (43.7 m) long and 32 ft wide. If it were closed, the detour would be 19.3 mi (31 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 | 7 Good | Some minor problems. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was IRR US012 over Snake Ck built?
It was built in 1966, making it 59 years old in 2025.
What condition is IRR US012 over Snake Ck 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 January 2025.
How much traffic does IRR US012 over Snake Ck carry?
About 1,091 vehicles per day (2024 count), of which roughly 20% are trucks.
How long is IRR US012 over Snake Ck?
The structure is 143 ft (43.7 m) long with a longest span of 55 ft (16.8 m) and a deck 32 ft wide.
Who owns IRR US012 over Snake Ck?
It is owned by the State Highway Agency.