Philbrook Main
Key Takeaway
Philbrook Main is classified as high hazard in California. It was completed in 1926 and is 100 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 | 87 ft (taller than 78.3% in CA) |
| Dam Length | 850 ft |
| Dam Type | Earth |
| Normal Storage | 5.0K acre-ft |
| Surface Area | 173 acres |
| Drainage Area | 5 sq mi |
| Max Discharge | 2,050 cfs |
| Year Completed | 1926 (100 years old) |
| NID ID | CA00345 |
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
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Philbrook Main?
Philbrook Main 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 Philbrook Main?
Philbrook Main is owned by Pacific Gas and Electric Company (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Philbrook Main built?
Philbrook Main was completed in 1926, making it 100 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 Philbrook Main?
Philbrook Main 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 Philbrook Main?
Philbrook Main has a dam height of 87 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 Philbrook Main last inspected?
Philbrook Main was last inspected on July 11, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.