IRR SD1806 over Straight Ck
FairLyman County, South Dakota · 6.7 NW JCT Sd 273 · Structure no. 000000043216034
- Built
- 1997
- 28 years old
- Condition
- Fair
- inspected March 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 56 ft
- 1 main span
- Daily traffic
- 161
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
IRR SD1806 over Straight Ck is a steel stringer/multi-beam or girder carrying IRR SD1806 over Straight Ck in Lyman County, South Dakota. It was built in 1997, so it is 28 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 161 vehicles a day, roughly 18% of them trucks, projected to reach 227 by 2044. The structure is 56 ft (17.1 m) long and 39 ft wide. If it were closed, the detour would be 24.2 mi (39 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 | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was IRR SD1806 over Straight Ck built?
It was built in 1997, making it 28 years old in 2025.
What condition is IRR SD1806 over Straight 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 March 2024.
How much traffic does IRR SD1806 over Straight Ck carry?
About 161 vehicles per day (2024 count), of which roughly 18% are trucks.
How long is IRR SD1806 over Straight Ck?
The structure is 56 ft (17.1 m) long with a longest span of 52 ft (15.8 m) and a deck 39 ft wide.
Who owns IRR SD1806 over Straight Ck?
It is owned by the State Highway Agency.