If it was anything, it was from JX. It's hard to tell the clearance between his property and the power lines that run south towards the main road and how traversable the terrain is. If he could make it through the trees behind his house to the power lines with a vehicle, though, there's what looks to be a dirt maintenance path that also connects with the maintenance road for the entire reservoir system. So incredibly easy if that was possible.
Otherwise, there is also an entrance from the road according to
@Bulldogs2