One of my friends is trying to do some writing research, so I am asking on her behalf.
She is looking for a lake in US, preferably somewhere warm, so it can be a summer home. The lake must be swimmable and have clear to semi-clear water for story reasons, so it can’t be completely opaque or filled with algae, and it must allow private ownership, because the property has to have a dock. She was asking about our local Canyon Lake originally, but Canyon Lake is managed by the US Corps of Engineers and you can’t have a private dock, you can only use public access.
The property also needs to be at least somewhat reasonable price-wise, because her family is middle class, so a $3,000,000 lake “cabin” is right out. They don’t own the entire lake, just a property on the shore.