Green #4
Key Takeaway
Green #4 is classified as low hazard in Montana. It was completed in 1970 and is 56 years old. Its primary use is irrigation.
Physical Details
| Dam Height | 20 ft (taller than 44.5% in MT) |
| Dam Length | 1,000 ft |
| Dam Type | Earth |
| Max Storage | 498 acre-ft |
| Normal Storage | 219 acre-ft |
| Year Completed | 1970 (56 years old) |
| NID ID | MT01718 |
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
L J GREEN & SONS
Private
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Green #4?
Green #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 Green #4?
Green #4 is owned by L J GREEN & SONS (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Green #4 built?
Green #4 was completed in 1970, making it 56 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 Green #4?
Green #4 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 Green #4?
Green #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.