Hog Flat
Key Takeaway
Hog Flat is classified as high hazard in California. It was completed in 1891 and is 135 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 | 15 ft (taller than 8.1% in CA) |
| Dam Length | 1,760 ft |
| Dam Type | Earth |
| Max Storage | 8.0K acre-ft |
| Surface Area | 1,000 acres |
| Drainage Area | 8 sq mi |
| Year Completed | 1891 (135 years old) |
| NID ID | CA00515 |
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
Lassen Irrigation Company
Private
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Hog Flat?
Hog Flat 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 Hog Flat?
Hog Flat is owned by Lassen Irrigation Company (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Hog Flat built?
Hog Flat was completed in 1891, making it 135 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 Hog Flat?
Hog Flat 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 Hog Flat?
Hog Flat has a dam height of 15 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 Hog Flat last inspected?
Hog Flat was last inspected on May 24, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.