$5 per person if you don't live in Watertown. It's clean and fun and there is a lifeguard on duty. They do choose between 230 and 3 to check water quality but you can leave your stuff and go back on without paying again.
There is a big parking lot as long as it's open . its easy access. They have removed the play ground last I saw
If you don't live in Watertown its $1.50 per person to get in
The last time I was there no maybe for parking
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