The Lake holds about 39 trillion gallons of water, enough to cover the state of California to a depth of 14½ inches. A dam at Tahoe City on the Lake’s outlet regulates the upper 6.1 feet of Lake Tahoe above the low water rim. Between the regulated high and low water levels, the volume of water in Tahoe can vary by 243 billion gallons. By volume, Tahoe is the sixth largest lake in the USA.
Fact credit: TahoeFacts.com