The Truckee River is a stream in the U.S. states of California and Nevada. The river flows northeasterly and is 121 miles long. The Truckee is the sole outlet of Lake Tahoe and drains part of the high Sierra Nevada, emptying into Pyramid Lake in the Great Basin. Its waters are an important source of irrigation along its valley and adjacent valleys.

 

The Truckee River's source is the outlet of Lake Tahoe, at the dam on the northwest side of the lake near Tahoe City, California. It flows generally northeast through the mountains to Truckee, California, then turns sharply to the east and flows into Nevada, through Reno and Sparks and along the northern end of the Carson Range. At Fernley it turns north, flowing along the east side of the Pah Rah Range. It empties into the southern end of Pyramid Lake, a remnant of prehistoric Lake Lahontan, in northern Washoe County in the Pyramid Lake Indian Reservation.

 

 

The Truckee River's endorheic drainage basin is about 3,060 square miles (7,900 km2), of which about 2,300 square miles (6,000 km2) are in Nevada. The Middle Watershed is regarded as the 15 miles (24 km) of river and its tributaries from Tahoe City in Placer County, through the Town of Truckee in Nevada County, to the state line between Sierra and Washoe counties. The major tributaries to the Truckee River in California from the Lake Tahoe outlet and heading downstream include: Bear Creek, Squaw Creek, Cabin Creek, Pole Creek, Donner Creek, Trout Creek, Martis Creek, Prosser Creek, the Little Truckee River, Gray Creek, and Bronco Creek. Major lakes and reservoirs in the California part of the watershed include Lake Tahoe, Donner Lake, Independence Lake, Webber Lake, Boca Reservoir, Stampede Reservoir, Prosser Creek Reservoir, and Martis Creek Reservoir.  In the Lower Watershed, Steamboat Creek, which drains Washoe Lake, is the major tributary to the Truckee River.