IRR Ar SD273 over Medicine Ck
FairLyman County, South Dakota · 0.2 N I 90 @ Kennebec · Structure no. 000000043250204
- Built
- 1967
- 58 years old
- Condition
- Fair
- inspected January 2025
- Type
- Slab
- Concrete Continuous
- Length
- 173 ft
- 4 main spans
- Daily traffic
- 464
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
IRR Ar SD273 over Medicine Ck is a concrete continuous slab carrying IRR Ar SD273 over Medicine Ck in Lyman County, South Dakota. It was built in 1967, so it is 58 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 5 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 464 vehicles a day, roughly 23% of them trucks, projected to reach 656 by 2044. The structure is 173 ft (52.7 m) long and 39 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was IRR Ar SD273 over Medicine Ck built?
It was built in 1967, making it 58 years old in 2025.
What condition is IRR Ar SD273 over Medicine Ck 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 January 2025.
How much traffic does IRR Ar SD273 over Medicine Ck carry?
About 464 vehicles per day (2024 count), of which roughly 23% are trucks.
How long is IRR Ar SD273 over Medicine Ck?
The structure is 173 ft (52.7 m) long with a longest span of 45 ft (13.7 m) and a deck 39 ft wide.
Who owns IRR Ar SD273 over Medicine Ck?
It is owned by the State Highway Agency.