Donner Lake, formerly known as Truckee Lake, is a freshwater lake in Northeast California on the eastern slope of the Sierra Nevada and about 20 miles (32 km) northwest of the much larger Lake Tahoe. A moraine serves as a natural dam for the lake. The lake is located in the town of Truckee, between Interstate 80 to the north and Schallenberger Ridge to the south. The tracks of the Union Pacific Railroad run along Schallenberger Ridge and closely follow the route of the original transcontinental railroad. The historic route of the Lincoln Highway, the first automobile road across America and US 40 follows the northern shoreline, then climbs to Donner Pass from where the entire lake may be viewed.

Truckee is an incorporated town in Nevada County, California, United States. As of the 2010 United States Census, the population was 16,180, reflecting an increase of 2,316 from the 13,864 counted in the 2000 Census and having the 316th highest population in California and 2114th in the United States.