Upper Twin Lake
Key Takeaway
Upper Twin Lake is classified as high hazard in California. It was completed in 1905 and is 121 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 | 14 ft (taller than 6.7% in CA) |
| Dam Length | 160 ft |
| Dam Type | Earth |
| Max Storage | 2.1K acre-ft |
| Surface Area | 286 acres |
| Drainage Area | 30 sq mi |
| Year Completed | 1905 (121 years old) |
| NID ID | CA00643 |
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
Centennial Livestock
Private
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Upper Twin Lake?
Upper Twin Lake 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 Upper Twin Lake?
Upper Twin Lake is owned by Centennial Livestock (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Upper Twin Lake built?
Upper Twin Lake was completed in 1905, making it 121 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 Upper Twin Lake?
Upper Twin 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 Upper Twin Lake?
Upper Twin Lake has a dam height of 14 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 Upper Twin Lake last inspected?
Upper Twin Lake was last inspected on November 14, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.