Upper Truckee River
General data
- Name: Upper Truckee River
- Water system: Pyramid Lake
- Water type: River
- Progression: Lake Tahoe -> Truckee River -> Pyramid Lake -> Planet Earth
- Climates: Temperate
- Continents: North America
- Countries: United States of America
The Upper Truckee River is a stream that flows northward from the western slope of Red Lake Peak in Alpine County, California to Lake Tahoe via the Truckee Marsh in South Lake Tahoe, California. The river flows northeasterly and is 23 miles (37 km) long. It is Lake Tahoe's largest tributary.