Union Valley Reservoir
General data
- Name: Union Valley Reservoir
- Water system: Sacramento River
- Water type: Artificial lake
- Progression: Silver Creek (American River tributary) -> South Fork American River -> American River (Sacramento River tributary) -> Sacramento River -> Suisun Bay -> Carquinez Strait -> San Pablo Bay -> San Francisco Bay -> Golden Gate strait -> Pacific Ocean -> Planet Earth
- Climates: Temperate
- Continents: North America
- Countries: United States of America