If the area is that remote it is possible that many of those women were killed by bears or wolves and dragged off into the woods. It would be difficult to assume that all of them were victims of one serial killer.
That was my first thought: Bears. Then, Big Foot. Then I chuckled a little bit and came back to bears. It very well could be bears, in at least a few of the cases. Not sure about wolves.
But they don’t mention any men being killed or disappearing along that stretch of road. Bears wouldn’t be that selective in their choice of victims. But then, neither would most serial killers.