Private meaning privately owned? Yes, but if you're asking you can't go there. There's places to go swimming here back in the woods. Lots of little paths just South of the dog park area. The old owners of the park dumped a lot of concrete and steel into the lake here so it's kind of rough swimming. No sand beaches.
Yes
Yes, several areas. Not sand beaches, but areas right next to Lake Washington that you can lay out at, plus there's a pier as well, which has a type of beach area.
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