Most lakes, even big ones, turn over their water fairly quickly. A drop of water landing in Lake Erie, for example, usually spends about two years there before finding its way out. (Don’t ask me how they know this.)
Lake Tahoe is different, though. For one thing, it’s extremely deep. Also, about 60 rivers feed into it, but only one leads out. For these reasons, water takes about 700 years to escape the lake.
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