US085 N over I090
FairLawrence County, South Dakota · US 85 S Interchange · Structure no. 000000041155087
- Built
- 1971
- 54 years old
- Condition
- Fair
- inspected December 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete Continuous
- Length
- 274 ft
- 4 main spans
- Daily traffic
- 3,477
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
US085 N over I090 is a prestressed concrete continuous stringer/multi-beam or girder carrying US085 N over I090 in Lawrence County, South Dakota. It was built in 1971, so it is 54 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 3,477 vehicles a day, roughly 13% of them trucks, projected to reach 5,038 by 2044. The structure is 274 ft (83.6 m) long and 41 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 | 8 Very Good | No problems noted. |
| 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 US085 N over I090 built?
It was built in 1971, making it 54 years old in 2025.
What condition is US085 N over I090 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 December 2024.
How much traffic does US085 N over I090 carry?
About 3,477 vehicles per day (2024 count), of which roughly 13% are trucks.
How long is US085 N over I090?
The structure is 274 ft (83.6 m) long with a longest span of 86 ft (26.2 m) and a deck 41 ft wide.
Who owns US085 N over I090?
It is owned by the State Highway Agency.