Manzanita Diversion
Key Takeaway
Manzanita Diversion is classified as high hazard in California. It was completed in 1917 and is 109 years old. Its primary use is hydroelectric. 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 | 30 ft (taller than 30.4% in CA) |
| Dam Length | 205 ft |
| Dam Type | Concrete |
| Max Storage | 168 acre-ft |
| Normal Storage | 164 acre-ft |
| Surface Area | 26 acres |
| Drainage Area | 61 sq mi |
| Max Discharge | 1,500 cfs |
| Year Completed | 1917 (109 years old) |
| NID ID | CA00342 |
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
Pacific Gas and Electric Company
Private
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Low Hazard 60 ftFrequently Asked Questions
What is the hazard classification of Manzanita Diversion?
Manzanita Diversion 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 Manzanita Diversion?
Manzanita Diversion is owned by Pacific Gas and Electric Company (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Manzanita Diversion built?
Manzanita Diversion was completed in 1917, making it 109 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 Manzanita Diversion?
Manzanita Diversion serves the following purposes: Hydroelectric. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Manzanita Diversion?
Manzanita Diversion has a dam height of 30 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 Manzanita Diversion last inspected?
Manzanita Diversion was last inspected on September 5, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.