READ THIS BEFORE USING MAP. This map shows common backcountry ski routes and runs in Tronsen non-motorized area at Blewett Pass. Backcountry skiing can be dangerous and you should use this map at your own risk. All routes/runs should be assumed to be avalanche terrain until you personally decide otherwise in the field. If you enjoy sliding in Tronsen non-motorized area, let the forest service know as they do not currently devote resources to maintaining this area.