Dox,
Sadly, yes it sees it's fair share of snowmobiles from the east side, depending upon where you're headed (don't know about from the Crystal Mountain side). Off of SR 410, where the Little Naches river crosses beneath the highway, is the turn-off for Forest Road 19. This road goes to Kaner Flats, heavily used by sled-heads. They park and unload here, and take off northwest towards Raven's Roost, and many make the run over Naches Pass, skirting the Norse Peak Wilderness Area to the north, and end up all the way over in Greenwater. If your intended location is anywhere along this line, think about going somewhere else. Cheers!