IRR I029 N over Burlington Northern RR
FairRoberts County, South Dakota · 0.6 S US 12 Interch · Structure no. 000000055085433
- Built
- 1979
- 46 years old
- Condition
- Fair
- inspected August 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 164 ft
- 3 main spans
- Daily traffic
- 3,650
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
IRR I029 N over Burlington Northern RR is a steel continuous stringer/multi-beam or girder carrying IRR I029 N over Burlington Northern RR in Roberts County, South Dakota. It was built in 1979, so it is 46 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 3,650 vehicles a day, roughly 40% of them trucks, projected to reach 5,146 by 2044. The structure is 164 ft (50 m) long and 43 ft wide. If it were closed, the detour would be 0.6 mi (1 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 | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was IRR I029 N over Burlington Northern RR built?
It was built in 1979, making it 46 years old in 2025.
What condition is IRR I029 N over Burlington Northern RR 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 August 2024.
How much traffic does IRR I029 N over Burlington Northern RR carry?
About 3,650 vehicles per day (2024 count), of which roughly 40% are trucks.
How long is IRR I029 N over Burlington Northern RR?
The structure is 164 ft (50 m) long with a longest span of 63 ft (19.2 m) and a deck 43 ft wide.
Who owns IRR I029 N over Burlington Northern RR?
It is owned by the State Highway Agency.