Porta Reservoir No. 2
Key Takeaway
Porta Reservoir No. 2 is classified as significant hazard in Montana. It was completed in 1963 and is 63 years old. Its primary use is recreation. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 22 ft (taller than 63.5% in MT) |
| Dam Length | 3,600 ft |
| Dam Type | Earth |
| Max Storage | 114 acre-ft |
| Normal Storage | 114 acre-ft |
| Drainage Area | 32 sq mi |
| Year Completed | 1963 (63 years old) |
| NID ID | MT01216 |
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
N. PORTA
Private
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Low Hazard 32 ftFrequently Asked Questions
What is the hazard classification of Porta Reservoir No. 2?
Porta Reservoir No. 2 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 Porta Reservoir No. 2?
Porta Reservoir No. 2 is owned by N. PORTA (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Porta Reservoir No. 2 built?
Porta Reservoir No. 2 was completed in 1963, making it 63 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 Porta Reservoir No. 2?
Porta Reservoir No. 2 serves the following purposes: Recreation, 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 Porta Reservoir No. 2?
Porta Reservoir No. 2 has a dam height of 22 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.