IRR US012 over I029
FairRoberts County, South Dakota · US 12 & I 29 Interchange · Structure no. 000000055085429
- Built
- 1978
- 47 years old
- Condition
- Fair
- inspected June 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 362 ft
- 4 main spans
- Daily traffic
- 1,830
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
IRR US012 over I029 is a steel continuous stringer/multi-beam or girder carrying IRR US012 over I029 in Roberts County, South Dakota. It was built in 1978, so it is 47 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 fair condition with a lowest component rating of 5 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 1,830 vehicles a day, roughly 32% of them trucks, projected to reach 3,572 by 2044. The structure is 362 ft (110.3 m) long and 47 ft wide.
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 | 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 US012 over I029 built?
It was built in 1978, making it 47 years old in 2025.
What condition is IRR US012 over I029 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 June 2023.
How much traffic does IRR US012 over I029 carry?
About 1,830 vehicles per day (2024 count), of which roughly 32% are trucks.
How long is IRR US012 over I029?
The structure is 362 ft (110.3 m) long with a longest span of 107 ft (32.6 m) and a deck 47 ft wide.
Who owns IRR US012 over I029?
It is owned by the State Highway Agency.