485 Avenue over Burlington Northern RR
FairGrant County, South Dakota · 1S & 1.5W Big Stone · Structure no. 000000026360032
- Built
- 1978
- 47 years old
- Condition
- Fair
- inspected September 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 184 ft
- 3 main spans
- Daily traffic
- 397
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
485 Avenue over Burlington Northern RR is a steel continuous stringer/multi-beam or girder carrying 485 Avenue over Burlington Northern RR in Grant 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 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 397 vehicles a day, roughly 20% of them trucks, projected to reach 397 by 2017. The structure is 184 ft (56.1 m) long and 33 ft wide. If it were closed, the detour would be 2.5 mi (4 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 | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was 485 Avenue over Burlington Northern RR built?
It was built in 1978, making it 47 years old in 2025.
What condition is 485 Avenue 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 September 2024.
How much traffic does 485 Avenue over Burlington Northern RR carry?
About 397 vehicles per day (2022 count), of which roughly 20% are trucks.
How long is 485 Avenue over Burlington Northern RR?
The structure is 184 ft (56.1 m) long with a longest span of 70 ft (21.4 m) and a deck 33 ft wide.
Who owns 485 Avenue over Burlington Northern RR?
It is owned by the County Highway Agency.