Yea, that website is amazing. There are a few small lakes around me I wish they had, but I can't complain since it's free. The amount of water on there is incredible.

Downloading the app is free. It has the same maps and info as the website, but you have to pay to unlock sections of the country. They give you one free section of your choice. The section I chose includes most of western KY and southern IN. Everything east of KY Lake and Lake Barkley (but not including KY Lake and Lake Barkley) and west of I-75 and then southern IN. This is all I really need right now, so it's definitely worth it for me.