Gravelly Range Lake
Key Takeaway
Gravelly Range Lake is classified as significant hazard in Montana. It was completed in 1964 and is 62 years old. Its primary use is irrigation. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 12 ft (taller than 9.2% in MT) |
| Dam Length | 36 ft |
| Dam Type | Earth |
| Max Storage | 627 acre-ft |
| Normal Storage | 483 acre-ft |
| Drainage Area | 4 sq mi |
| Max Discharge | 20 cfs |
| Year Completed | 1964 (62 years old) |
| NID ID | MT00300 |
Safety Information
No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
ED GRADY
Private
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Gravelly Range Lake?
Gravelly Range Lake is classified as Significant Hazard. No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Gravelly Range Lake?
Gravelly Range Lake is owned by ED GRADY (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Gravelly Range Lake built?
Gravelly Range Lake 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 Gravelly Range Lake?
Gravelly Range Lake 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 Gravelly Range Lake?
Gravelly Range Lake has a dam height of 12 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.