Long Lake
Key Takeaway
Long Lake is classified as significant hazard in California. It was completed in 1938 and is 88 years old. Its primary use is water supply. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 12 ft (taller than 4% in CA) |
| Dam Length | 110 ft |
| Dam Type | Rockfill |
| Max Storage | 1.5K acre-ft |
| Surface Area | 141 acres |
| Drainage Area | 1 sq mi |
| Year Completed | 1938 (88 years old) |
| NID ID | CA00534 |
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
Graeagle Water Company
Private
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Low Hazard 17 ftFrequently Asked Questions
What is the hazard classification of Long Lake?
Long 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 Long Lake?
Long Lake is owned by Graeagle Water Company (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Long Lake built?
Long Lake was completed in 1938, making it 88 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 Long Lake?
Long Lake serves the following purposes: Water Supply, Irrigation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Long Lake?
Long 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.
When was Long Lake last inspected?
Long Lake was last inspected on June 22, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.