IRR 117 ST over I029
FairRoberts County, South Dakota · 2.0 N Sd 10 & I29 Interch · Structure no. 000000055124170
- Built
- 1982
- 43 years old
- Condition
- Fair
- inspected May 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 330 ft
- 4 main spans
- Daily traffic
- 16
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
IRR 117 ST over I029 is a steel continuous stringer/multi-beam or girder carrying IRR 117 ST over I029 in Roberts County, South Dakota. It was built in 1982, so it is 43 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 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 16 vehicles a day, roughly 2% of them trucks, projected to reach 16 by 2043. The structure is 330 ft (100.6 m) long and 35 ft wide. If it were closed, the detour would be 1.9 mi (3 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. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was IRR 117 ST over I029 built?
It was built in 1982, making it 43 years old in 2025.
What condition is IRR 117 ST 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 May 2023.
How much traffic does IRR 117 ST over I029 carry?
About 16 vehicles per day (2023 count), of which roughly 2% are trucks.
How long is IRR 117 ST over I029?
The structure is 330 ft (100.6 m) long with a longest span of 101 ft (30.8 m) and a deck 35 ft wide.
Who owns IRR 117 ST over I029?
It is owned by the State Highway Agency.