Thunderhead Falls over Rapid Ck
PoorPennington County, South Dakota · 1.0E 2.0S Johnson Sd · Structure no. 000000052318318
- Built
- 1972
- 53 years old
- Condition
- Poor
- inspected June 2024
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 40 ft
- 1 main span
- Daily traffic
- 62
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
Thunderhead Falls over Rapid Ck is a prestressed concrete tee beam carrying Thunderhead Falls over Rapid Ck in Pennington County, South Dakota. It was built in 1972, so it is 53 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 62 vehicles a day, roughly 2% of them trucks, projected to reach 62 by 2032. The structure is 40 ft (12.2 m) long and 27 ft wide. If it were closed, the detour would be 98.8 mi (159 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 | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| 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 Thunderhead Falls over Rapid Ck built?
It was built in 1972, making it 53 years old in 2025.
What condition is Thunderhead Falls over Rapid 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 2024.
How much traffic does Thunderhead Falls over Rapid Ck carry?
About 62 vehicles per day (2022 count), of which roughly 2% are trucks.
How long is Thunderhead Falls over Rapid Ck?
The structure is 40 ft (12.2 m) long with a longest span of 40 ft (12.2 m) and a deck 27 ft wide.
Who owns Thunderhead Falls over Rapid Ck?
It is owned by the County Highway Agency.