Mcwilliams Reservoir
Key Takeaway
Mcwilliams Reservoir is classified as low hazard in Montana. It was completed in 1965 and is 61 years old. Its primary use is irrigation.
Physical Details
| Dam Height | 34 ft (taller than 92% in MT) |
| Dam Length | 1,125 ft |
| Dam Type | Earth |
| Max Storage | 1.1K acre-ft |
| Normal Storage | 742 acre-ft |
| Year Completed | 1965 (61 years old) |
| NID ID | MT00466 |
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
GARY/JOHN/MABEL JOHNSON
Private
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Low Hazard 45 ftFrequently Asked Questions
What is the hazard classification of Mcwilliams Reservoir?
Mcwilliams 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 Mcwilliams Reservoir?
Mcwilliams Reservoir is owned by GARY/JOHN/MABEL JOHNSON (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Mcwilliams Reservoir built?
Mcwilliams Reservoir was completed in 1965, making it 61 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 Mcwilliams Reservoir?
Mcwilliams 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 Mcwilliams Reservoir?
Mcwilliams Reservoir has a dam height of 34 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.