Almaden Reservoir
General data
- Name: Almaden Reservoir
- Water system: Guadalupe River (California)
- Water type: Artificial lake
- Progression: Alamitos Creek -> Guadalupe River (California) -> San Francisco Bay -> Golden Gate strait -> Pacific Ocean -> Planet Earth
- Climates: Subtropical
- Continents: North America
- Countries: United States of America
Almaden Reservoir is an artificial lake in the hills south of San Jose, California in the United States.
It borders on the 4,163-acre (1,685 ha) Almaden Quicksilver County Park, which provides limited fishing ("catch-and-release"), picnicking, hiking, and horseback riding activities.
Swimming and boating are not permitted in the reservoir.
The California Office of Environmental Health Hazard Assessment has issued a "Do Not Eat" advisory for any fish caught in Almaden Reservoir due to elevated levels of mercury.