Downs, Jack
Key Takeaway
Downs, Jack is classified as low hazard in Montana. It was completed in 1938 and is 88 years old. Its primary use is irrigation.
Physical Details
| Dam Height | 23 ft (taller than 66.4% in MT) |
| Dam Length | 850 ft |
| Dam Type | Earth |
| Max Storage | 266 acre-ft |
| Normal Storage | 90 acre-ft |
| Drainage Area | 18 sq mi |
| Max Discharge | 550 cfs |
| Year Completed | 1938 (88 years old) |
| NID ID | MT00932 |
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
DANIEL/BETTY DOWNS
Private
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Low Hazard 21 ftFrequently Asked Questions
What is the hazard classification of Downs, Jack?
Downs, Jack 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 Downs, Jack?
Downs, Jack is owned by DANIEL/BETTY DOWNS (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Downs, Jack built?
Downs, Jack 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 Downs, Jack?
Downs, Jack 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 Downs, Jack?
Downs, Jack has a dam height of 23 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.