Johnstone Pasture
Key Takeaway
Johnstone Pasture is classified as low hazard in Montana. It was completed in 1950 and is 76 years old. Its primary use is fire protection.
Physical Details
| Dam Height | 18 ft (taller than 36.9% in MT) |
| Dam Length | 150 ft |
| Dam Type | Earth |
| Max Storage | 51 acre-ft |
| Normal Storage | 30 acre-ft |
| Year Completed | 1950 (76 years old) |
| NID ID | MT03245 |
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
HAROLD JOHNSTONE
Private
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Low Hazard 10 ftFrequently Asked Questions
What is the hazard classification of Johnstone Pasture?
Johnstone Pasture 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 Johnstone Pasture?
Johnstone Pasture is owned by HAROLD JOHNSTONE (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Johnstone Pasture built?
Johnstone Pasture was completed in 1950, making it 76 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 Johnstone Pasture?
Johnstone Pasture serves the following purposes: Fire Protection, Stock, Or Small Fish Pond. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Johnstone Pasture?
Johnstone Pasture has a dam height of 18 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.