Easy to find using the directions. You just ignore the signs that says no camping and keep going and you will see the Forrest roads that allow camping. Sites are not that secluded (just pine trees) but they are very far from each other. I arrived about 5:30 and saw two dirt bike riders but after that nothing.

Literally complete silence throughout the night and close enough to come back and have breakfast in Bend ! (Be warned it got cold in October, my 30 f rated bag was not warm enough but lucky I brought a liner)