My Tahoe trivia fact, that I never fail to bore my fellow skiers with, is that when you are on the Nevada side of Tahoe, with the lake on your left and Carson Valley way down below you on your right, the bottom of the lake is actually lower than the Carson Valley floor.
Given that fact you can imagine how the fact in the OP could be true.
If we go with those figures, the lake was about three feet lower than the “natural rim” in November 1992. Doing the math, this means that the volume of the low-water Lake Tahoe, spread out over California, would be about one millimeter shallower than the “natural volume” of Lake Tahoe spread out the same way.
There is a lot more water hidden in the underground river system that links Tahoe to Pyramid Lake, 50 miles away. Tessie would need to alternate between the lakes to stay warm. Even Jaques Cousteau said “The world isn’t ready for what is down there."
Yeah, one has to remember that pesky 3rd dimension. I remember reading the increase in ocean depth if all the ice on Antarctica melted, and didn’t believe it since it’s such a small portion of the area of the globe. So, I did the math and showed that the ice would have to be over a MILE thick to do that … oops, it is.