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They plow the ice at Webster, everyone parks their rigs on the ice. The access is just left of the town beach. There is a small lot across the street from there but you'll see, it's easiest to just park on the ice.
There’s plenty of room off Webster ave! I saw a few atbs out there 2 weeks ago, and I’d imagine it has only gotten better since! Good luck
For a short drive further you might want to try Newfound, usually plenty of parking at state park or along the side of the road on the closest edge to town. Good luck