Cottonwood Canyon State Park - Oregon State Parks and Recreation
Stayed here on the drive up from Bend. Not all that hard to find on OR206, despite the warnings on the internet about GPS coordinates. Beautiful park, was a ranch for many years. There are a handful of trails over the 8000+ acres, none of which I took.
Currently, the camping is primitive, with vault toilets and central water spouts (I counted 3, likely more). Note that one can drive up to the water taps, but be aware that 2/3 taps are on the passenger side, not the drivers. Also come with dry waste tanks.
** if coming from the south, be aware that there is no left turn lane into the park. Comfortable turn around spots are about 4 miles north. **
Overall, really like the park. Peaceful and scenic. The firewood is hardwood and there is bark mulch (free) to use as firestarter.