West of Medford: From the town of Applegate, follow the road all the way south along the west side of the reservoir. At the south end, continue until a T-junction, then turn right (west). Ooodles of WONDERFUL campsites along the Applegate River, and you will be ALONE.
Northwest of Grant's Pass/West of Merlin: Several ideas here. Take Wolf Creek exit off I-5 and take the back road to Galice. Take Taylor Creek Road from Galice to Hwy 199 (eventually). Both routes are BLM lands: twenty+ miles of peaceful creekside, with excellent boondocking campsites.
I guess if a post is too long, or perhaps pasted, you get this strange verification stuff that doesn't work.