Whoops, sorry this is late, I kind of forgot about it. Lol.
Yes! It is indeed Crater Lake and Tahoe Lake, the 2 deepest lakes in the United States. In the north American continent, there is one lake that is deeper, somewhere in Canada, I don't remember what it's called.
Someone told me that if you took all the water in Lake Tahoe you could cover the entire state of California with 14" of water. I don't feel like doing math but if someone wants to verify this, let me know the results. :)
To the 2 people who commented on the original trivia post, if you want a postcard email me your mailing address firstname.lastname@example.org. Aloha!