Rock Cowan No. 1
Key Takeaway
Rock Cowan No. 1 is classified as low hazard in South Dakota. It was completed in 1950 and is 76 years old. Its primary use is fire protection.
Physical Details
| Dam Height | 26 ft (taller than 65.2% in SD) |
| Dam Length | 660 ft |
| Dam Type | Earth |
| Max Storage | 200 acre-ft |
| Normal Storage | 120 acre-ft |
| Max Discharge | 6,000 cfs |
| Year Completed | 1950 (76 years old) |
| NID ID | SD00242 |
Safety Information
No probable loss of human life and low economic/environmental losses expected.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
ROCK COWAN
Private
Nearby Dams
Rock Cowan No.2
Dewey, SD
Low Hazard 19 ftRock Cowan No. 4
Dewey, SD
Low Hazard 25 ftRock Cowan No.3
Dewey, SD
Low Hazard 22 ftD. Counting
Dewey, SD
Low Hazard 20 ftM. Schremp
Dewey, SD
Low Hazard 21 ftW.F. Collins
Dewey, SD
Low Hazard 19 ftGlen Holloway
Dewey, SD
Low Hazard 21 ftDon Farlee
Dewey, SD
Low Hazard 20 ftFrequently Asked Questions
What is the hazard classification of Rock Cowan No. 1?
Rock Cowan No. 1 is classified as Low Hazard. No probable loss of human life and low economic/environmental losses expected. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Rock Cowan No. 1?
Rock Cowan No. 1 is owned by ROCK COWAN (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Rock Cowan No. 1 built?
Rock Cowan No. 1 was completed in 1950, making it 76 years old. Many U.S. dams were built between the 1930s and 1970s during a period of major infrastructure investment.
What is the primary purpose of Rock Cowan No. 1?
Rock Cowan No. 1 serves the following purposes: Fire Protection, Stock, Or Small Fish Pond. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Rock Cowan No. 1?
Rock Cowan No. 1 has a dam height of 26 ft. Dam height is measured from the natural streambed at the downstream toe to the top of the dam, and may differ from the visible height.