Big Lagoon
Key Takeaway
Big Lagoon is classified as low hazard in California. It was completed in 1947 and is 79 years old. Its primary use is water supply.
Physical Details
| Dam Height | 16 ft (taller than 9.6% in CA) |
| Dam Length | 3,700 ft |
| Dam Type | Earth |
| Max Storage | 780 acre-ft |
| Surface Area | 78 acres |
| Drainage Area | 2 sq mi |
| Year Completed | 1947 (79 years old) |
| NID ID | CA00503 |
Safety Information
No probable loss of human life and low economic/environmental losses expected.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
California Redwood Acquisition Company
Private
Frequently Asked Questions
What is the hazard classification of Big Lagoon?
Big Lagoon is classified as Low Hazard. No probable loss of human life and low economic/environmental losses expected. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Big Lagoon?
Big Lagoon is owned by California Redwood Acquisition Company (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Big Lagoon built?
Big Lagoon was completed in 1947, making it 79 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 Big Lagoon?
Big Lagoon serves the following purposes: Water Supply, Tailings. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Big Lagoon?
Big Lagoon has a dam height of 16 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 Big Lagoon last inspected?
Big Lagoon was last inspected on June 7, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.