Turkey Hole is actually an angler's water access site on the Klickitat River but we used it for a dispersed campsite in winter while enjoying the wine areas of the gorge & post skiing at Mt Hood. Since it is free (as of 2018 for up to 14 nights) I would guess it can become quite busy at certain times of the year. We visited in Feb on a cold snowy weekend and there was only one other camper. There is a bathroom there also, but no running water.
Decent campground. Has a functioning outhouse. Located on the Klickatat river. Only downfall are the sqauters.