You are probably referring to the Hydro lines in St-Raymond. Used to be popular, but now cops show up quicker than on a domestic violence case and everything around it belongs to the saw mill and employees have been instructed to call the police. There was another similar spot but the golf club complained a lot.
Good luck with your search for a decent spot, they are harder to come by these days and best kept secret to avoid what happened with the other spots being abused by the entire city of Quebec going to those spots and turning it into sh!t pits.