Meeting rattlesnakes or garter snakes is the dangerous side of Tahoe Lake. Both species are strong swimmers, so you may see them in the water as well as on land. Rattlesnakes are poisonous, but they do not behave as aggressively when in the water.
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The largest of the the Sierra carnivores, the Black Bear is found in and around the Lake Tahoe Basin.
In short, yes, it is normally safe to swim in Lake Tahoe. Just be sure to wear boots when walking around the lake. The most common snake you might see in the lake is a garter snake. If you do happen to see a snake swimming in the lake, just let it pass by, as they are normally not venomous.
Tessie, the Monster of Lake Tahoe The state's largest freshwater lake, Tahoe has long been rumored to be home to both an underwater Mob graveyard, and a huge, unknown creature.