Ol John
Key Takeaway
Ol John is classified as low hazard in Montana. It was completed in 1964 and is 62 years old. Its primary use is fire protection.
Physical Details
| Dam Height | 18 ft (taller than 36.9% in MT) |
| Dam Length | 250 ft |
| Dam Type | Earth |
| Max Storage | 171 acre-ft |
| Normal Storage | 64 acre-ft |
| Drainage Area | 1 sq mi |
| Year Completed | 1964 (62 years old) |
| NID ID | MT02645 |
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
JOHN SCHLEPP
Private
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What is the hazard classification of Ol John?
Ol John 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 Ol John?
Ol John is owned by JOHN SCHLEPP (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Ol John built?
Ol John was completed in 1964, making it 62 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 Ol John?
Ol John 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 Ol John?
Ol John 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.