Slate Prairie Road over Castle Ck
PoorPennington County, South Dakota · 0.5E 1.2N Deerfd Dam · Structure no. 000000052141325
- Built
- 1950
- 75 years old
- Condition
- Poor
- inspected June 2023
- Type
- Stringer/Multi-beam or Girder
- Wood or Timber
- Length
- 26 ft
- 1 main span
- Daily traffic
- 73
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
Slate Prairie Road over Castle Ck is a wood or timber stringer/multi-beam or girder carrying Slate Prairie Road over Castle Ck in Pennington County, South Dakota. It was built in 1950, so it is 75 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 73 vehicles a day, roughly 2% of them trucks, projected to reach 73 by 2032. The structure is 26 ft (7.9 m) long and 20 ft wide. If it were closed, the detour would be 14.9 mi (24 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Slate Prairie Road over Castle Ck built?
It was built in 1950, making it 75 years old in 2025.
What condition is Slate Prairie Road over Castle Ck in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in June 2023.
How much traffic does Slate Prairie Road over Castle Ck carry?
About 73 vehicles per day (2022 count), of which roughly 2% are trucks.
How long is Slate Prairie Road over Castle Ck?
The structure is 26 ft (7.9 m) long with a longest span of 24 ft (7.3 m) and a deck 20 ft wide.
Who owns Slate Prairie Road over Castle Ck?
It is owned by the County Highway Agency.