Mortenson Dam
Key Takeaway
Mortenson Dam is classified as low hazard in South Dakota. It was completed in 1984 and is 42 years old. Its primary use is fire protection.
Physical Details
| Dam Height | 27 ft (taller than 71.8% in SD) |
| Dam Length | 370 ft |
| Dam Type | Earth |
| Max Storage | 56 acre-ft |
| Normal Storage | 28 acre-ft |
| Drainage Area | 1 sq mi |
| Max Discharge | 880 cfs |
| Year Completed | 1984 (42 years old) |
| NID ID | SD02469 |
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
SAM MORTENSON
Private
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Low Hazard 27 ftFrequently Asked Questions
What is the hazard classification of Mortenson Dam?
Mortenson 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 Mortenson Dam?
Mortenson Dam is owned by SAM MORTENSON (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Mortenson Dam built?
Mortenson Dam was completed in 1984, making it 42 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 Mortenson Dam?
Mortenson Dam serves the following purposes: Fire Protection, Stock, Or Small Fish Pond, 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 Mortenson Dam?
Mortenson Dam has a dam height of 27 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.