Why Lake Tahoe's Water Is Deep Blue and Crystal Clear

Lake Tahoe's stunning deep blue color and exceptional clarity (visibility down to 70+ feet in places) result from its high concentration of dissolved minerals—calcium carbonate, magnesium, potassium—and its very cold temperature, which inhibits algae growth. The water's purity and mineral content absorb red light, reflecting blue. Ongoing conservation efforts aim to maintain this clarity against threats like urban runoff and invasive species.