Mad Dam
Key Takeaway
Mad Dam is classified as low hazard in Montana. It was completed in 1955 and is 71 years old. Its primary use is irrigation.
Physical Details
| Dam Height | 26 ft (taller than 77.8% in MT) |
| Dam Length | 25 ft |
| Dam Type | Earth |
| Max Storage | 60 acre-ft |
| Normal Storage | 54 acre-ft |
| Max Discharge | 300 cfs |
| Year Completed | 1955 (71 years old) |
| NID ID | MT01269 |
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
PHILIP & PEGGY JOHNSON
Private
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Low Hazard 30 ftFrequently Asked Questions
What is the hazard classification of Mad Dam?
Mad 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 Mad Dam?
Mad Dam is owned by PHILIP & PEGGY JOHNSON (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Mad Dam built?
Mad Dam was completed in 1955, making it 71 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 Mad Dam?
Mad Dam serves the following purposes: Irrigation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Mad Dam?
Mad Dam 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.