Vacation for sale by owner in Big Arm, MT 59910. Relax and enjoy the wildlife in this quiet, secluded setting with a great view of Flathead Lake and the Mission Mountains. Room for RVs, campers, or extra vehicles. Only 2 miles to lake access (Big Arm State Park - http://fwp.mt.gov/lands/site_280041.aspx). 14 miles from Polson (with full s ... more.