Alexander Dam
Key Takeaway
Alexander Dam is classified as low hazard in South Dakota. It was completed in 1976 and is 50 years old. Its primary use is fish and wildlife pond.
Physical Details
| Dam Height | 38 ft (taller than 95.8% in SD) |
| Dam Length | 870 ft |
| Dam Type | Earth |
| Max Storage | 1.2K acre-ft |
| Normal Storage | 890 acre-ft |
| Max Discharge | 2,080 cfs |
| Year Completed | 1976 (50 years old) |
| NID ID | SD02373 |
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
Rocky Alexander
Private
Nearby Dams
Bakers Gulch Dam
Sully, SD
Low Hazard 39 ftK. Sutton
Sully, SD
Low Hazard 35 ftK. Sutton
Sully, SD
Low Hazard 34 ftV. Garrett
Sully, SD
Low Hazard 25 ftGarrett Dam
Sully, SD
Low Hazard 64 ftJ.E. Sheehan Estate #3
Stanley, SD
Low Hazard 25 ftWalter Thompson
Stanley, SD
Low Hazard 25 ftLowell West Dam
Sully, SD
Low Hazard 60 ftFrequently Asked Questions
What is the hazard classification of Alexander Dam?
Alexander Dam 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 Alexander Dam?
Alexander Dam is owned by Rocky Alexander (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Alexander Dam built?
Alexander Dam was completed in 1976, making it 50 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 Alexander Dam?
Alexander Dam serves the following purposes: Fish And Wildlife Pond. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Alexander Dam?
Alexander Dam has a dam height of 38 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.