IRR SD1806 over Cedar Ck
GoodLyman County, South Dakota · 6.4 NW JCT Sd 273 · Structure no. 000000043218036
- Built
- 1997
- 28 years old
- Condition
- Good
- inspected March 2024
- Type
- Slab
- Concrete Continuous
- Length
- 137 ft
- 4 main spans
- Daily traffic
- 161
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
IRR SD1806 over Cedar Ck is a concrete continuous slab carrying IRR SD1806 over Cedar 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 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 161 vehicles a day, roughly 18% of them trucks, projected to reach 227 by 2044. The structure is 137 ft (41.8 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
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. |
| 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 Cedar Ck built?
It was built in 1997, making it 28 years old in 2025.
What condition is IRR SD1806 over Cedar Ck 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 March 2024.
How much traffic does IRR SD1806 over Cedar Ck carry?
About 161 vehicles per day (2024 count), of which roughly 18% are trucks.
How long is IRR SD1806 over Cedar Ck?
The structure is 137 ft (41.8 m) long with a longest span of 35 ft (10.7 m) and a deck 39 ft wide.
Who owns IRR SD1806 over Cedar Ck?
It is owned by the State Highway Agency.