IMO the key is to have your fly bouncing boulders in the winter...no good to do the classic down n across swing with light flies. Use heavy flies, cast across, stack mend and move down after cast...the quicker you get down and the longer you stay within a few feet of bottom the better success you will have. Oh ya, get a good hook file and check for sharpness constantly...

If you throw bobbers you are drift fishing...:)