Grroming / CC ski on Forest service road

This morning I got face to face with a Groomer on Neptune Forest service road. I was travelling with my SUV with chains

I was told by the driver that this was for the ski club by right (blackjack).

 

I would like to know how the ski club can have possession of an activated forest service road? 

 

I do not understand how this can happens, specially in the middle of hunting season? I do Believe the is also some municipality aqueduc down there....