Nelson #1
Key Takeaway
Nelson #1 is classified as significant hazard in Montana. It was completed in 1960 and is 66 years old. Its primary use is irrigation. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 20 ft (taller than 44.5% in MT) |
| Dam Length | 1,500 ft |
| Dam Type | Earth |
| Max Storage | 443 acre-ft |
| Normal Storage | 227 acre-ft |
| Drainage Area | 4 sq mi |
| Max Discharge | 800 cfs |
| Year Completed | 1960 (66 years old) |
| NID ID | MT01552 |
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
LYLE E NELSON
Private
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Significant Hazard 16 ftFrequently Asked Questions
What is the hazard classification of Nelson #1?
Nelson #1 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 Nelson #1?
Nelson #1 is owned by LYLE E NELSON (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Nelson #1 built?
Nelson #1 was completed in 1960, making it 66 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 Nelson #1?
Nelson #1 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 Nelson #1?
Nelson #1 has a dam height of 20 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.