Guenoc Lake
Key Takeaway
Guenoc Lake is classified as high hazard in California. It was completed in 1928 and is 98 years old. Its primary use is other. 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 | 50 ft (taller than 59.1% in CA) |
| Dam Length | 1,410 ft |
| Dam Type | Earth |
| Max Storage | 3.2K acre-ft |
| Surface Area | 188 acres |
| Drainage Area | 10 sq mi |
| Year Completed | 1928 (98 years old) |
| NID ID | CA00564 |
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
Langtry Farms, LLC
Private
Nearby Dams
Langtry
Lake, CA
Low Hazard 50 ftLake Bordeaux
Lake, CA
Low Hazard 43 ftLake Burgundy
Lake, CA
Low Hazard 28 ftMccreary
Lake, CA
Low Hazard 20 ftBottoms
Lake, CA
High Hazard 47 ftBurns
Napa, CA
Significant Hazard 39 ftEaton H. Magoon Lake
Napa, CA
High Hazard 32 ftBar X Ranch Reservoir #2
Lake, CA
High Hazard 30 ftFrequently Asked Questions
What is the hazard classification of Guenoc Lake?
Guenoc 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 Guenoc Lake?
Guenoc Lake is owned by Langtry Farms, LLC (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Guenoc Lake built?
Guenoc Lake was completed in 1928, making it 98 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 Guenoc Lake?
Guenoc Lake serves the following purposes: Other, Irrigation, Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Guenoc Lake?
Guenoc Lake has a dam height of 50 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 Guenoc Lake last inspected?
Guenoc Lake was last inspected on August 31, 2021. Inspection dates indicate when a formal review occurred, not the results of that inspection.