Log Cabin Inn on Hwy 6. From there ride the pave to the gravel dump at the summit, then take fireroads from Roger's Camp, to Brown's camp, on past Prison Camp, toward the Jordan Creek Staging area, and come out in the Trask area near Tillamook. Good ride. http://www.advrider.com/forums/showthread.php?t=215344&page=68i
Here is a similar route starting in Yamhill County. One could also start at Haag Lake.