Napa Valley Lake
Key Takeaway
Napa Valley Lake is classified as low hazard in California. It was completed in 1990 and is 36 years old. Its primary use is other.
Physical Details
| Dam Height | 40 ft (taller than 46.3% in CA) |
| Dam Length | 2,170 ft |
| Dam Type | Earth |
| Max Storage | 200 acre-ft |
| Surface Area | 17 acres |
| Drainage Area | 0 sq mi |
| Year Completed | 1990 (36 years old) |
| NID ID | CA01256 |
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
Langtry Farms, LLC
Private
Nearby Dams
Eaton H. Magoon Lake
Napa, CA
High Hazard 32 ftDeer Creek
Napa, CA
Low Hazard 40 ftMccreary
Lake, CA
Low Hazard 20 ftDick Week
Napa, CA
Significant Hazard 70 ftUpper Twin Lake
Napa, CA
Low Hazard 19 ftLower Twin Lake
Napa, CA
Low Hazard 18 ftDavis
Napa, CA
Significant Hazard 42 ftLong Valley West No. 2
Napa, CA
Low Hazard 35 ftFrequently Asked Questions
What is the hazard classification of Napa Valley Lake?
Napa Valley Lake 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 Napa Valley Lake?
Napa Valley Lake is owned by Langtry Farms, LLC (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Napa Valley Lake built?
Napa Valley Lake was completed in 1990, making it 36 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 Napa Valley Lake?
Napa Valley 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 Napa Valley Lake?
Napa Valley Lake has a dam height of 40 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 Napa Valley Lake last inspected?
Napa Valley Lake was last inspected on September 1, 2021. Inspection dates indicate when a formal review occurred, not the results of that inspection.