Johnson (Toole)
Key Takeaway
Johnson (Toole) is classified as low hazard in Montana. It was completed in 1953 and is 73 years old. Its primary use is irrigation.
Physical Details
| Dam Height | 15 ft (taller than 18.8% in MT) |
| Dam Length | 830 ft |
| Dam Type | Earth |
| Max Storage | 186 acre-ft |
| Normal Storage | 95 acre-ft |
| Drainage Area | 6 sq mi |
| Max Discharge | 600 cfs |
| Year Completed | 1953 (73 years old) |
| NID ID | MT00430 |
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
CECIL S BENJAMIN
Private
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Low Hazard 45 ftFrequently Asked Questions
What is the hazard classification of Johnson (Toole)?
Johnson (Toole) 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 Johnson (Toole)?
Johnson (Toole) is owned by CECIL S BENJAMIN (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Johnson (Toole) built?
Johnson (Toole) was completed in 1953, making it 73 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 Johnson (Toole)?
Johnson (Toole) 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 Johnson (Toole)?
Johnson (Toole) has a dam height of 15 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.