Johnston and Son Ranch #4
Key Takeaway
Johnston and Son Ranch #4 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 | 20 ft (taller than 44.5% in MT) |
| Dam Length | 400 ft |
| Dam Type | Earth |
| Max Storage | 81 acre-ft |
| Normal Storage | 28 acre-ft |
| Drainage Area | 1 sq mi |
| Max Discharge | 500 cfs |
| Year Completed | 1964 (62 years old) |
| NID ID | MT02929 |
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
JOHNSTON AND SON RANCH
Private
Nearby Dams
Tauck #3
Carter, MT
Low Hazard 14 ftDing Dong
Carter, MT
Significant Hazard 30 ftMajor #1
Carter, MT
Low Hazard 18 ftPenny
Carter, MT
Significant Hazard 24 ftOne D-4 Ranch
Carter, MT
Low Hazard 20 ftTwo D-4 Ranch
Carter, MT
Low Hazard 20 ftPintail Dam
Carter, MT
Low HazardGussie #3
Carter, MT
Low Hazard 22 ftFrequently Asked Questions
What is the hazard classification of Johnston and Son Ranch #4?
Johnston and Son Ranch #4 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 Johnston and Son Ranch #4?
Johnston and Son Ranch #4 is owned by JOHNSTON AND SON RANCH (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Johnston and Son Ranch #4 built?
Johnston and Son Ranch #4 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 Johnston and Son Ranch #4?
Johnston and Son Ranch #4 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 Johnston and Son Ranch #4?
Johnston and Son Ranch #4 has a dam height of 20 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.