Bonanza
Key Takeaway
Bonanza is classified as significant hazard in Montana. It was completed in 1938 and is 88 years old. Its primary use is irrigation. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 44 ft (taller than 95.7% in MT) |
| Dam Length | 1,020 ft |
| Dam Type | Earth |
| Max Storage | 409 acre-ft |
| Normal Storage | 350 acre-ft |
| Surface Area | 25 acres |
| Drainage Area | 8 sq mi |
| Year Completed | 1938 (88 years old) |
| NID ID | MT01154 |
Safety Information
No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
DAVID A VOLDSETH
Private
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High Hazard 40 ftFrequently Asked Questions
What is the hazard classification of Bonanza?
Bonanza is classified as Significant Hazard. No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Bonanza?
Bonanza is owned by DAVID A VOLDSETH (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Bonanza built?
Bonanza was completed in 1938, making it 88 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 Bonanza?
Bonanza 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 Bonanza?
Bonanza has a dam height of 44 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.