The Truckee River is a stream in the U.S. states of California and Nevada. The river is about 120 miles (190 km) long. Its 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 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 river is heavily used for recreation, including whitewater rafting and fly fishing. A common rafting run is the River Ranch Run. Starting from the outlet gates at Lake Tahoe stretching about 3 miles (4.8 km), the run ends at the River Ranch Restaurant. These rapids are almost all class 1 and class 2. In downtown Reno the river has been sculpted into a half-mile Class 2/3 whitewater park, and is used mainly for kayaking.