SD1806 over Whetstone Ck
GoodGregory County, South Dakota · 8.0 N JCT US 18 · Structure no. 000000027299221
- Built
- 1977
- 48 years old
- Condition
- Good
- inspected November 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete Continuous
- Length
- 305 ft
- 4 main spans
- Daily traffic
- 157
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
SD1806 over Whetstone Ck is a prestressed concrete continuous stringer/multi-beam or girder carrying SD1806 over Whetstone Ck in Gregory County, South Dakota. It was built in 1977, so it is 48 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 157 vehicles a day, roughly 30% of them trucks, projected to reach 217 by 2044. The structure is 305 ft (93 m) long and 35 ft wide. If it were closed, the detour would be 19.9 mi (32 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 | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SD1806 over Whetstone Ck built?
It was built in 1977, making it 48 years old in 2025.
What condition is SD1806 over Whetstone 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 November 2023.
How much traffic does SD1806 over Whetstone Ck carry?
About 157 vehicles per day (2024 count), of which roughly 30% are trucks.
How long is SD1806 over Whetstone Ck?
The structure is 305 ft (93 m) long with a longest span of 80 ft (24.3 m) and a deck 35 ft wide.
Who owns SD1806 over Whetstone Ck?
It is owned by the State Highway Agency.