I have never approached the county supervisor's office about this issue. I would think that Ranger Brad would be the best person to approach the county. I will make some inquiries about how to handle this sensitive issue with the county.
The Forest Service mentions nudity within the National Forest on its flyer so it must be legal from the Federal point of view. On their flyer the Forest Service mentioned that nudity was prohibited within a certain distance of a specific public road.
There are jurisdictional issues here between the County, State and Federal agencies that need to be examined.