Jeffrey #2
Key Takeaway
Jeffrey #2 is classified as significant hazard in Montana. It was completed in 1922 and is 104 years old. Its primary use is irrigation. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 25 ft (taller than 70.3% in MT) |
| Dam Length | 475 ft |
| Dam Type | Earth |
| Max Storage | 258 acre-ft |
| Normal Storage | 132 acre-ft |
| Year Completed | 1922 (104 years old) |
| NID ID | MT02354 |
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
JOHN T GIBBS
Private
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Low Hazard 21 ftFrequently Asked Questions
What is the hazard classification of Jeffrey #2?
Jeffrey #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 Jeffrey #2?
Jeffrey #2 is owned by JOHN T GIBBS (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Jeffrey #2 built?
Jeffrey #2 was completed in 1922, making it 104 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 Jeffrey #2?
Jeffrey #2 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 Jeffrey #2?
Jeffrey #2 has a dam height of 25 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.