Forest up from near Dry Lake.
DRY LAKE, when attempting to find the ribbon flagging up to Mt. Dewdney, failed to find.
I am pretty sure the very small and discreet rock cairn is just right of that cedar and out of picture. From there, you just have to start heading up and keep a sharp eye out for the occassional flag. The times we have gone up there, there was very little flagging and the 'trail' is very faint, if noticeable at all. Count on finding your own way for much of it.