I090 W over SD090 L
GoodLyman County, South Dakota · Oacoma Interchange · Structure no. 000000043485272
- Built
- 1971
- 54 years old
- Condition
- Good
- inspected January 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 195 ft
- 3 main spans
- Daily traffic
- 4,382
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
I090 W over SD090 L is a steel continuous stringer/multi-beam or girder carrying I090 W over SD090 L in Lyman 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 4,382 vehicles a day, roughly 25% of them trucks, projected to reach 6,257 by 2044. The structure is 195 ft (59.4 m) long and 41 ft wide. If it were closed, the detour would be 0.6 mi (1 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I090 W over SD090 L built?
It was built in 1971, making it 54 years old in 2025.
What condition is I090 W over SD090 L in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in January 2023.
How much traffic does I090 W over SD090 L carry?
About 4,382 vehicles per day (2024 count), of which roughly 25% are trucks.
How long is I090 W over SD090 L?
The structure is 195 ft (59.4 m) long with a longest span of 74 ft (22.6 m) and a deck 41 ft wide.
Who owns I090 W over SD090 L?
It is owned by the State Highway Agency.