I recently did a bit of web surfing and found some info about lake Tahoe freezing over. I was keen to see if, in winter, when temperatures drop, would I be able to run across it in-game.
The first explanation I found told me that lake Tahoe doesn't freeze over due to its large amount of underlying movement. This, not explaining much, I kept looking and stumbled across this quite interesting info.
Just thought I'd share.