El Capitan Reservoir
General data
- Name: El Capitan Reservoir
- Water system: Pacific Ocean
- Water type: Artificial lake
- Progression: San Diego River -> Pacific Ocean -> Planet Earth
- Climates: Temperate
- Continents: North America
- Countries: United States of America
El Capitan Reservoir is a reservoir in central San Diego County, California. It is in the Cuyamaca Mountains, about 30 miles (48 km) northeast of the city of San Diego and two miles northwest of the town of Alpine.