Westlake Reservoir
Key Takeaway
Westlake Reservoir is classified as high hazard in California. It was completed in 1972 and is 54 years old. Its primary use is water supply. High hazard means loss of life is likely if the dam fails — it does not indicate the dam's current condition. Learn more.
Physical Details
| Dam Height | 158 ft (taller than 90.9% in CA) |
| Dam Length | 1,400 ft |
| Dam Type | Earth |
| Max Storage | 9.2K acre-ft |
| Surface Area | 156 acres |
| Drainage Area | 1 sq mi |
| Year Completed | 1972 (54 years old) |
| NID ID | CA00904 |
Safety Information
Loss of human life is likely if the dam fails.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
Las Virgenes Municipal Water District
Public Utility
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Significant Hazard 44 ftFrequently Asked Questions
What is the hazard classification of Westlake Reservoir?
Westlake Reservoir is classified as High Hazard. Loss of human life is likely if the dam fails. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Westlake Reservoir?
Westlake Reservoir is owned by Las Virgenes Municipal Water District (Public Utility). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Westlake Reservoir built?
Westlake Reservoir was completed in 1972, making it 54 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 Westlake Reservoir?
Westlake Reservoir 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 Westlake Reservoir?
Westlake Reservoir has a dam height of 158 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 Westlake Reservoir last inspected?
Westlake Reservoir was last inspected on November 16, 2021. Inspection dates indicate when a formal review occurred, not the results of that inspection.