Thirtymile Reservoir
Key Takeaway
Thirtymile Reservoir is classified as low hazard in Montana. It was completed in 1933 and is 93 years old. Its primary use is irrigation.
Physical Details
| Dam Height | 14 ft (taller than 15.6% in MT) |
| Dam Length | 40 ft |
| Dam Type | Gravity |
| Max Storage | 55 acre-ft |
| Normal Storage | 55 acre-ft |
| Year Completed | 1933 (93 years old) |
| NID ID | MT02534 |
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
JACK RICHMAN
Private
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Low Hazard 15 ftFrequently Asked Questions
What is the hazard classification of Thirtymile Reservoir?
Thirtymile Reservoir 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 Thirtymile Reservoir?
Thirtymile Reservoir is owned by JACK RICHMAN (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Thirtymile Reservoir built?
Thirtymile Reservoir was completed in 1933, making it 93 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 Thirtymile Reservoir?
Thirtymile Reservoir 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 Thirtymile Reservoir?
Thirtymile Reservoir has a dam height of 14 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.