From Yakima take Hwy 12/410 west ,You will come to the Little town of Naches about 15 miles west of Yakima, keep going west at 5miles more the Hwy splits left is hwy 12 ,GO straight stay on hwy 410. Sit back and enjoy the drive it`s aways to go ,You will come to Cliffdell [and the speed limit is 35] You will see Whistlin Jacks motel quick-mart and gas, Another 5 mi west at mile marker 73 [Ithink] .The HwyCurves to the left ,And FS19 is a right turn ,It might also be posted as American River Rec Area.On FS 19 @ 2.5 mi.on the Right is Kaner Flats Campground.
Coming from Spokane this is going to take you about 1.5 hours more travel time than to Liberty, and the cell phones probably wont work.CB#4 when close enough.