My grandparents have a camp on lake skaneatalas, one of the finger lakes in New York. It's only a mile across and 16 miles long, but is over 350 ft deep. Doesn't seem very deep compared to this shit but if you're tubing or waterskiing in middle and you fall, you start to think about things and freak shit lol.
Pics of lake for reference, also the #2 cleanest lake in US, top 10 in the world, awesome place.